CN120019898A - Method for preparing steel pipe for oil and gas transportation - Google Patents
Method for preparing steel pipe for oil and gas transportation Download PDFInfo
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- CN120019898A CN120019898A CN202311552753.9A CN202311552753A CN120019898A CN 120019898 A CN120019898 A CN 120019898A CN 202311552753 A CN202311552753 A CN 202311552753A CN 120019898 A CN120019898 A CN 120019898A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
本发明涉及石油天然气输送钢管技术领域，公开了一种制备油气输送钢管的方法。方法包括：(1)确定待制备钢管的屈服强度控制目标；(2)获取成型前钢板的应力表征参数Rtx中x的数值，并根据所述待制备钢管的屈服强度控制目标获取所述成型前钢板的目标Rtx；(3)根据所述目标Rtx制备所述成型前钢板，并根据所述成型前钢板的实测Rtx与目标Rtx的数量关系，获取所述成型前钢板在制管过程中的实际扩径率；(4)根据所述实际扩径率，铣边制得成型所需钢板；(5)将所述成型所需钢板进行成型、焊接，并对焊接得到的全部焊接管采用相同的扩径参数进行机械扩径，得到油气输送钢管。可使所制得的钢管屈服强度波动范围窄。
The present invention relates to the technical field of steel pipes for oil and natural gas transportation, and discloses a method for preparing steel pipes for oil and gas transportation. The method comprises: (1) determining the yield strength control target of the steel pipe to be prepared; (2) obtaining the value of x in the stress characterization parameter Rtx of the steel plate before forming, and obtaining the target Rtx of the steel plate before forming according to the yield strength control target of the steel pipe to be prepared; (3) preparing the steel plate before forming according to the target Rtx, and obtaining the actual diameter expansion rate of the steel plate before forming during the pipe making process according to the quantitative relationship between the measured Rtx of the steel plate before forming and the target Rtx; (4) milling the edge according to the actual diameter expansion rate to obtain the steel plate required for forming; (5) forming and welding the steel plate required for forming, and mechanically expanding all welded pipes obtained by welding using the same diameter expansion parameters to obtain the oil and gas transportation steel pipe. The yield strength fluctuation range of the obtained steel pipe can be narrowed.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas conveying steel pipes, in particular to a method for preparing an oil and gas conveying steel pipe.
Background
Oil and gas pipelines are the most economical and efficient way to transport petroleum and gas on a large scale and over long distances. With the rapid development of economy, the construction of domestic oil and gas pipelines is rapidly developed. Up to the present, the oil gas long-distance pipeline is built in China for 15 ten thousands of kilometers, but the requirement can not be met, and the China still is in the peak period of pipeline construction for a period of time in the future.
The yield strength is one of the most important performances of the oil and gas transmission steel pipe, not only determines the bearing capacity of the pipeline, but also has important influences on the strain capacity of the pipeline, the strength matching of girth welds and the like. When the fluctuation of the yield strength of the steel pipe is large, the steel pipe with lower strength can generate large strain when the pipeline is stressed and deformed, and the steel pipe with higher strength does not start to strain yet, so that the integral coordinated strain capacity of the pipeline is reduced. In addition, when the fluctuation of the yield strength of the steel pipe is large, the pipeline girth weld is required to reach more than the upper limit of the yield strength to realize the excessively strong matching, so that the girth weld difficulty and the girth weld failure risk caused by the low-strength matching are increased. These factors can have a serious adverse effect on pipeline safety. Therefore, the oil and gas pipeline standard sets requirements on the upper limit and the lower limit of the yield strength of the steel pipe, and the more important pipeline is, the more strict the requirements on the fluctuation range of the yield strength are, for example, the range of the yield strength specified by the API Spec 5L standard is 555-705MPa for an X80 steel pipe, the range of the yield strength specified by the Western gas east two-line technology is 555-690MPa, and the range of the yield strength specified by the middle Russian line technology is 555-675MPa. For submarine pipelines, large-strain pipelines and the like, the fluctuation range of the yield strength of the steel pipe is generally required to be within 100 MPa. The method is used for strictly controlling the fluctuation of the yield strength of the steel pipe and narrowing the yield strength interval, and is a trend of the development of oil and gas pipeline steel pipe products. With the increasing requirements on the safety of oil and gas pipelines, the requirements on the consistency of the quality and the performance of the steel pipe products are higher, and the requirements on the yield strength control level of the steel pipe products are higher.
The yield strength of a steel pipe is affected by multiple complex factors such as the chemical composition of raw materials, the manufacturing process, the pipe making process and the like. The traditional control method for the yield strength of the steel pipe firstly establishes the requirement for the yield strength of the steel plate, but the control difficulty of the yield strength of the steel plate is large and the fluctuation range is large due to the complexity of chemical components, a rolling process and an accelerated cooling process in the manufacturing process of the steel plate. In addition, the yield strength of the material can be obviously changed in the process of manufacturing the longitudinal submerged arc welded pipe, the change is influenced by the intrinsic factors of the material, and the relevance between the change and the yield strength value of the material is not strong, so that the effect of controlling the yield strength of the steel pipe can not be completely achieved by controlling the yield strength of the steel plate, and the fluctuation of the yield strength of the steel pipe is large.
At present, the control range of the yield strength of the oil gas transmission steel pipe reaching 120MPa is difficult to meet the higher requirement of the pipeline on the uniformity of the yield strength of the steel pipe. Therefore, the novel method for preparing the oil gas conveying steel pipe is provided, the uniformity of the yield strength of the steel pipe is improved, and the method has important significance for realizing the high-quality development of the oil gas conveying pipeline.
Disclosure of Invention
The invention provides a method for preparing an oil gas conveying steel pipe, which aims at the problems that the existing oil gas conveying steel pipe has large fluctuation range of yield strength and poor uniformity, and further influences the safety of an oil gas pipeline.
In order to achieve the above object, the present invention provides a method of manufacturing an oil and gas transportation steel pipe, comprising:
(1) Determining a yield strength control target of the steel pipe to be prepared, wherein the target lower limit value of the yield strength is Rt 0.5min, and the target upper limit value of the yield strength is Rt 0.5max;
(2) Obtaining a numerical value of x in a stress characterization parameter Rtx of a steel plate before forming, and obtaining a lower limit value and an upper limit value of the target Rtx of the steel plate before forming according to a target lower limit value Rt 0.5min of the yield strength of the steel pipe to be prepared and a target upper limit value Rt 0.5max of the yield strength, wherein the lower limit value is a target Rtxmin, and the upper limit value is a target Rtxmax;
(3) Determining a steel plate manufacturing process according to the target Rtx, preparing and obtaining the steel plate before forming, and carrying out a tensile test on the steel plate before forming to obtain a stress strain curve and an actual Rtx of the steel plate before forming;
(4) Calculating to obtain the width of the steel plate required by forming according to the actual diameter expansion rate, and milling edges of the steel plate before forming according to the width of the steel plate required by forming to obtain the steel plate required by forming;
(5) And (3) forming and welding the steel plate required by forming, and mechanically expanding all welded pipes by adopting the same diameter expansion parameters to obtain the oil gas conveying steel pipe.
Through the technical scheme, the invention can obtain the following beneficial effects:
(1) The method for preparing the oil gas conveying steel pipe can effectively reduce the fluctuation range of the yield strength of the steel pipe, can control the yield strength of the steel pipe in a narrower interval range, and can prevent the strain from being concentrated on one steel pipe when the pipeline is strained by external force after a plurality of steel pipes prepared by the method are welded and connected into the pipeline, thereby greatly improving the coordinated deformation capacity of the pipeline and the safety of the oil gas pipeline;
(2) The method for preparing the oil gas conveying steel pipe is beneficial to realizing the further compression of the upper limit of the yield strength of the steel pipe, further reducing the difficulty of high-strength matching during girth welding, being beneficial to realizing high-strength matching of the girth welding of the pipeline, reducing the failure probability of the girth welding and improving the safety of the oil gas pipe;
(3) According to the method for preparing the oil gas transmission steel pipe, the steel plate stress characterization parameters are adopted to replace the steel plate Rt 0.5, and the change of the yield strength is controlled through the adjustment of the strain quantity in the pipe making process, so that the difficulty is lower, the reliability is higher and the economy is better than the traditional method for ensuring the yield strength range of the steel pipe by proposing a stricter steel plate yield strength range requirement.
Drawings
FIG. 1 is a first fitted line graph of steel plate stress values and steel pipe sample yield strength values in example 1 of the present invention.
FIG. 2 is a second fitted line graph of steel plate stress values and steel pipe sample yield strength values in example 1 of the present invention.
FIG. 3 is a third fitted line graph of steel plate stress values and steel pipe sample yield strength values in example 1 of the present invention.
Fig. 4 is a fourth fitted line graph of steel plate stress values and steel pipe sample yield strength values in example 1 of the present invention.
Fig. 5 is a fifth fitted line graph of the steel plate stress value and the steel pipe sample yield strength value in example 1 of the present invention.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The invention provides a method for preparing an oil gas conveying steel pipe, which comprises the following steps:
(1) Determining a yield strength control target of the steel pipe to be prepared, wherein the target lower limit value of the yield strength is Rt 0.5min, and the target upper limit value of the yield strength is Rt 0.5max;
(2) Obtaining a numerical value of x in a stress characterization parameter Rtx of a steel plate before forming, and obtaining a lower limit value and an upper limit value of the target Rtx of the steel plate before forming according to a target lower limit value Rt 0.5min of the yield strength of the steel pipe to be prepared and a target upper limit value Rt 0.5max of the yield strength, wherein the lower limit value is a target Rtxmin, and the upper limit value is a target Rtxmax;
(3) Determining a steel plate manufacturing process according to the target Rtx, preparing and obtaining the steel plate before forming, and carrying out a tensile test on the steel plate before forming to obtain a stress strain curve and an actual Rtx of the steel plate before forming;
(4) Calculating to obtain the width of the steel plate required by forming according to the actual diameter expansion rate, and milling edges of the steel plate before forming according to the width of the steel plate required by forming to obtain the steel plate required by forming;
(5) And (3) forming and welding the steel plate required by forming, and mechanically expanding all welded pipes by adopting the same diameter expansion parameters to obtain the oil gas conveying steel pipe.
According to the method for preparing the oil gas transmission steel pipe, provided by the invention, the yield strength of the material after pipe making can be better represented by adopting the steel plate stress representation parameter Rtx based on pipe making strain. Because the Rtx of the steel plate is close to the yield strength Rt 0.5 of the steel pipe after pipe making, the Rtx is adopted, so that the guidance and timeliness of the steel plate manufacturing process are stronger, and a narrower tensile property control interval is facilitated to be obtained. And determining the target Rtx of the steel plate according to the yield strength control target of the steel pipe to be prepared and the target plastic strain epsilon 1% of the wall thickness center in the pipe making process, and using the target Rtx as the tensile property requirement of the steel plate to guide the production of the steel plate and the optimization of the tensile property. However, the yield strength of the steel plate may not reach the ideal range due to the complex factors such as chemical components, rolling, heat treatment processes and the like, so that the purpose of controlling the yield strength range of the steel pipe is difficult to achieve only by controlling the yield strength of the steel plate. In the pipe making process, the plastic strain of the material has a remarkable influence on the yield strength of the steel pipe, the yield strength of the steel pipe can be improved by improving the plastic strain in the pipe making process, and the yield strength of the steel pipe can be reduced by reducing the plastic strain in the pipe making process. The yield strength of the steel pipe can be further adjusted and controlled by adjusting the plastic strain of the pipe making process. According to the principle that the steel plate Rtx is approximately equal to the steel pipe yield strength Rt 0.5, when the steel plate Rtx falls within the steel pipe yield strength control range, pipe making is carried out according to the target plastic strain epsilon 1%, when the steel plate Rtx is higher than the steel pipe yield strength control upper limit, pipe making is carried out by measuring and reducing the pipe plastic strain, and when the steel plate Rtx is lower than the steel pipe yield strength control lower limit, pipe making is carried out by measuring and improving the pipe plastic strain. Through the two measures, the invention can realize the accurate control of the yield strength of the steel pipe product, improve the uniformity of the yield strength of the steel pipe product and reduce the fluctuation range of the yield strength.
The method for preparing the oil gas transmission steel pipe provided by the invention is improved from the two aspects of yield strength control of a steel plate before forming and optimization of pipe plastic strain (related to diameter expansion rate) and is based on the existing steel pipe preparation process, and it is understood that the method for preparing the oil gas transmission steel pipe provided by the invention further comprises conventional steps and corresponding process parameters in the existing steel pipe preparation process, such as steel plate ultrasonic plate detection, edge milling, pre-bending, forming, welding, weld joint inspection (ultrasonic continuous detection and X-ray television inspection), mechanical diameter expansion, flat head, hydraulic pressure test, chamfering, pipe inspection (ultrasonic continuous detection and X-ray television inspection), finished product inspection and the like, and the invention is not repeated herein.
According to the invention, in the method for preparing the oil and gas transmission steel pipe, in the step (3), the method for obtaining the actual diameter expansion rate comprises the following steps:
When the target Rtxmin is smaller than or equal to the actually measured Rtx is smaller than or equal to the target Rtxmax, the diameter of the steel plate before forming is increased in the mechanical diameter expansion (the steel plate before forming is rolled into a barrel shape and then welded, and then the welded steel pipe is mechanically increased) according to the actual diameter expansion rate of k%, wherein k% is the target diameter expansion rate;
When the actually measured Rtx is smaller than a target Rtxmin, searching a point with the strain of x 1% on a stress-strain curve of the steel plate before forming, and meeting a target Rtxmin Rtx 1 is smaller than or equal to a target Rtxmax, wherein the steel plate before forming is subjected to mechanical expansion in a pipe manufacturing process (the steel plate before forming is rolled into a barrel shape and then welded, and then the welded steel pipe is subjected to mechanical expansion) according to the actual expansion rate of (k+x 1 -x)%;
when Rtx is actually measured to be target Rtxmax, a point with the strain of x 2% is searched on a stress-strain curve of the steel plate before forming, the target Rtxmin Rtx 2 is met, the target Rtxmax is met, the steel plate before forming is subjected to mechanical expansion in the pipe making process (the steel plate before forming is rolled into a barrel shape and then welded, and then the welded steel pipe is subjected to mechanical expansion) and is subjected to expansion according to the actual expansion rate of (k+x 2 -x)%.
According to the invention, in the method for obtaining the actual expansion ratio, the limit of x 1、x2 is wider, so long as the point of the strain x 1% satisfies the target Rtxmin-Rtx 1 -target Rtxmax and the point of the strain x 2% satisfies the target Rtxmin-Rtx 2 -target Rtxmax in the stress-strain curve of the steel plate before forming. The closer the stress Rtx 2 corresponding to the stress Rtx 1、x2 corresponding to x 1 is to (target Rtxmin +target Rtxmax)/2, the more favorable the yield strength of the steel pipe product is controlled in a narrower interval range.
According to the method for preparing the oil and gas transmission steel pipe, the step (1) further comprises the step of obtaining the target width W 1 of the steel plate required for forming and the plastic strain epsilon 1 of the wall thickness center in the pipe making process, wherein,
W1=(D-t)×π/(1+k%)–δ;
ε1＝k+100δ/W1;
D is the outer circumference (unit: mm) of the steel pipe to be manufactured, t is the wall thickness (unit: mm) of the steel pipe to be manufactured, k% is the target expansion rate, and delta is the forming extension (unit: mm).
In accordance with the present invention, epsilon 1 = k may also be roughly considered in some embodiments, given the small value of 100 δ/W.
According to the present invention, the target width W 1 is a reference for determining the width, and is also a basic reference for determining the width of the steel sheet before edge milling in the subsequent step (4), so that the steel sheet before edge milling must have a certain width margin in order to enable the pipe strain to be adjusted within a certain range.
According to the invention, in the method for preparing the oil and gas transmission steel pipe, in the step (2), the method for obtaining the value of x in the stress characterization parameter Rtx of the steel plate before forming and the lower limit value and the upper limit value of the target Rtx-I comprises the following steps:
Selecting N steel plate samples with the corresponding set specification of the steel pipe to be prepared, respectively obtaining stress strain curves of the N corresponding steel plate samples through a tensile test, selecting M steel plate strain values based on a preset interval a% in each corresponding stress strain curve by taking (epsilon 1 +delta epsilon)% as a standard to obtain M steel plate stress values corresponding to different strain values, and obtaining N steel plate stress values corresponding to M groups of different strain values and each group of same strain value by taking the stress curve of the N corresponding steel plate samples and the M steel plate stress values corresponding to different strain values as a group, wherein N is more than or equal to 5, M is more than or equal to 3, and delta epsilon is a parameter corresponding to a yield strength selection standard of the steel pipe to be prepared;
(2-2) respectively preparing N steel pipe samples according to parameters of the steel pipes to be prepared and corresponding to steel pipe samples with preset specifications, and obtaining stress-strain curves of the N steel pipe samples and yield strength values of the N steel pipe samples corresponding to the strain values delta epsilon% through a tensile test;
(2-3) obtaining M fitting straight lines through straight line fitting based on the obtained N steel plate stress values corresponding to the same strain value and N steel pipe sample yield strength values corresponding to the strain value delta epsilon%, wherein the fitting straight line RtDeltax=a+b which corresponds to the fitting goodness with the largest value in the M fitting straight lines is taken as the value of x in the stress characterization parameter Rtx;
Calculating the lower limit value and the upper limit value of the target Rtx of the steel plate before forming based on a fitting straight line RtDeltax=a+b×the steel pipe Rt 0.5 corresponding to the fitting goodness with the maximum value,
Target Rtxmin =a+b×target Rt 0.5min+c1 of the steel pipe to be produced;
Target Rtxmax =a+b×target Rt 0.5max+d1 of the steel pipe to be produced;
Where c 1、d1 is the safety margin.
According to the present invention, in the method for producing an oil and gas transportation steel pipe, in the step (2), it is preferable that Δε be 0.5. In the art, the stress corresponding to the total deformation of the tensile stress strain curve being 0.5% is generally taken as the yield strength, so the invention mainly takes the stress as the selection standard of the yield strength of the steel pipe to be prepared.
According to the method for producing an oil and gas transportation steel pipe of the present invention, in the step (2-1), preferably, the steel sheet sample is a transverse sampling sample. In the present invention, the sampling position of the steel sheet sample is a position corresponding to the sampling position of the tensile sample required by the steel pipe standard, that is, if the sampling of the center position of the base material in the circumferential direction of the steel pipe is required after the pipe is made, the steel sheet sample should be taken from the center of the width of the steel sheet. In addition, the material with better uniformity of the performance of the whole steel plate can be sampled at other positions, and the invention is not particularly limited to the method.
According to the invention, in the method for manufacturing the oil and gas transmission steel pipe, in the step (2-1), preferably, the method for obtaining the stress values of the M steel plates comprises taking epsilon 1 +delta epsilon as the center and taking the left and right sides of the center respectively in the stress-strain curves of the N corresponding steel plate samples based on the preset interval aThe stress values are used for obtaining corresponding M steel plate stress values;
wherein a >0;M is an odd number;
According to the invention, the stress values of the M steel plates are obtained by adopting the method, so that the relation between the Rtx of the steel plate before forming and the yield strength (such as Rt 0.5) of the steel pipe can be established more efficiently, and the representative Rtx value can be obtained rapidly. The invention provides the method which is a uniform value method, and in addition, the invention also comprises an unequal interval value method, namely asymmetric value, one point can be taken at the left side of epsilon 1 +delta epsilon, two points can be taken at the right side of epsilon, The minimum value selected on the left side of the steel tube is a strain value corresponding to the yield strength of the steel tube, and the maximum value selected on the right side of the steel tube is not more than 5.
According to the method for preparing the oil gas transmission steel pipe, in the step (2-2), in the tensile test, the selection position of the steel pipe sample is consistent with the selection position of the steel plate sample, and the selection positions are all the same end part in the steel plate, so that other accumulated errors of the steel plate in the test and the steel pipe after pipe making are reduced. Specifically, the steel plate sample selection and the steel pipe sample selection in the invention can be sequentially selected at the set ends of the N base metal steel plates so as to ensure that the selection positions of the steel plate sample selection and the steel pipe sample selection are at the same end.
According to the method for preparing the oil and gas transmission steel pipe, in the step (2-3), preferably, the method for obtaining the goodness of fit comprises the following steps:
Wherein x i is a steel plate stress value variable, y i is a steel pipe sample yield strength value variable, Is the stress average value corresponding to the same strain value of N steel plates,The average value of yield strengths corresponding to the N steel pipe samples is given.
According to the method for preparing the oil gas transmission steel pipe, c 1≥0,d1 is less than or equal to 0 in the step (2-3). Preferably, c 1≤20,-20≤d1 is more than or equal to 0 and less than or equal to 0, so that the risk of deviation of individual data points from a regression curve, which is caused by the unavoidable deviation of the individual data points from the target value in the fitting process, can be greatly reduced, the range of the target Rtx is further narrowed, and the fluctuation range of the yield strength of the steel pipe is further narrowed.
According to the method for preparing the oil and gas transmission steel pipe, in the step (2), besides the method-I described in the step (2-1), the step (2-2) and the step (2-3), the following method-II may be adopted to rapidly obtain the value of x in the stress characterization parameter Rtx of the steel plate before forming and the lower limit value and the upper limit value of the target Rtx, specifically:
The numerical value of x in the stress characterization parameter Rtx of the steel plate before forming is =epsilon 1 +0.5;
Target Rtxmin = target Rt 0.5min+c2 of the steel pipe to be prepared;
target Rtxmax = target Rt 0.5max+d2 of the steel pipe to be prepared;
Where c 2、d2 is the safety margin.
According to the invention, in the process-II, c 2≥0,d2 is.ltoreq.0. Preferably, c 2≤20,-20≤d2 is more than or equal to 0 and less than or equal to 0, so that the risk of deviation of individual data points from a regression curve, which is caused by the unavoidable deviation of the individual data points from the target value in the fitting process, can be greatly reduced, the range of the target Rtx is further narrowed, and the fluctuation range of the yield strength of the steel pipe is further narrowed.
In the method for preparing the oil gas conveying steel pipe, in the step (2), for obtaining the value of x in the stress characterization parameter Rtx of the steel plate before forming and the lower limit value and the upper limit value of the target Rtx, the method-I and the method-II can be adopted, the method-I has advantages in accuracy, the accurate control of the yield strength of the steel pipe product is facilitated, the result can be obtained more quickly, and the control requirement of the yield strength of the steel pipe product can be met.
According to the method for manufacturing the oil and gas transmission steel pipe, in the step (3), the manufacturing width lower limit value W 2 of the steel plate before forming (without edge milling) is obtained before the steel plate before forming is manufactured, wherein,
W 2 = (D-t) x pi/(1+k '%) - δ, wherein k'% = k% -0.5%;
D is the outer circumference (unit: mm) of the steel pipe to be manufactured, t is the wall thickness (unit: mm) of the steel pipe to be manufactured, k% is the target expansion rate, and delta is the forming extension (unit: mm).
According to the invention, the lower limit value W 2 of the preparation width of the steel plate (without edge milling) before forming is that the width of the steel plate is reserved to be an allowance according to (k-0.5)% before edge milling, so that the width of the steel plate required by forming can be ensured after edge milling.
According to the method for preparing the oil gas transmission steel pipe, in the step (4) and the step (5), the edge milling, forming, welding and mechanical expanding can be implemented by adopting the conventional process and parameters in the field, and the invention is not particularly limited.
In the present invention, the yield strength of steel sheets and pipes was measured by the method specified in GB/T228.1-2021 (section 1 of tensile test of metallic materials: room temperature test method).
The present invention will be described in detail by examples. In the following examples and comparative examples, common commercial products were used as the materials used unless otherwise specified.
Example 1
Preparing X80 (D1219X 22 mm) steel pipe with yield strength in 555-675MPa
(1-1) Steel pipe yield strength control target, lower limit Rt 0.5min =555 MPa, upper limit Rt 0.5max =675 MPa.
(1-2) According to the outer circumference D=3830 mm, the wall thickness t=22 mm, the target expansion rate k% =0.8% and the forming expansion delta=6 mm of the expanded steel pipe, the calculation is carried out:
Target plate width of steel plate after edge milling
Plastic strain in the center of wall thickness during tubing
(2) The method-I is adopted to obtain the value of x in the stress characterization parameter Rtx of the steel plate, and the lower limit value and the upper limit value of the target Rtx of the steel plate:
(2-1) selecting 30 steel plate samples with corresponding set specifications of steel pipes to be prepared, respectively obtaining stress strain curves of 30 corresponding steel plate samples through a tensile test, respectively selecting 5 steel plate strain values (0.5%, 1.0%, 1.55%, 2.0% and 2.5%) based on a preset interval a% by taking epsilon 11.0,Δε1 as 0.5 as a standard in each corresponding stress strain curve so as to obtain 5 steel plate stress values (Rt 0.5、Rt1.0、Rt1.5、Rt2.0、Rt2.5) corresponding to different strain values, and based on the stress strain curves of 30 corresponding steel plate samples and the 5 steel plate stress values corresponding to different strain values, taking the steel plate stress values corresponding to the same strain values as a group, and obtaining 5 groups of different strain values and 30 steel plate stress values corresponding to the same strain values (the result see table 1);
(2-2) preparing 30 steel pipe samples according to parameters (D1219 multiplied by 22 mm) of the steel pipe to be prepared into 30 steel pipe samples according to the corresponding set specification of the 30 steel pipe to be prepared, and obtaining stress strain curves of the 30 steel pipe samples and yield strength values Rt 0.5 of the 30 steel pipe samples through a tensile test (the results are shown in Table 1);
TABLE 1
(2-3) Inputting the obtained 30 steel plate stress values corresponding to the same strain value and the yield strength value Rt 0.5 of the 30 steel pipe samples into a data table of origin software, wherein each column of data corresponds to one column in the data table, and the data are plotted by taking the steel plate stress value (steel plate Rt 0.5, steel plate Rt 1.0, steel plate Rt 1.5, steel plate Rt 2.0, steel plate Rt 2.5) as a Y axis and taking the yield strength value Rt 0.5 of the steel pipe samples as an X axis, and linear fitting is carried out by a linear fitting function carried by the software to obtain a fitting straight line (respectively marked as a first fitting straight line, a second fitting straight line, a third fitting straight line, a fourth fitting straight line and a fifth fitting straight line as shown in fig. 1) and a goodness of fit:
A first fitting straight line, namely a steel plate Rt 0.5 =604-0.0745 ×a steel pipe Rt 0.5, and a fitting goodness R 2 =0.0035;
A second fitting straight line, namely a steel plate Rt 1.0 =295+0.471×a steel pipe Rt 0.5, and a fitting goodness R 2 = 0.2938;
A third fitting straight line, namely a steel plate Rt 1.5 =188+0.671 multiplied by a steel pipe Rt 0.5, and a fitting goodness R 2 = 0.6532;
A fourth fitting straight line, namely a steel plate Rt 2.0 =144+0.766×a steel pipe Rt 0.5, and a fitting goodness R 2 = 0.7955;
A fifth fitting straight line, namely a steel plate Rt 2.5 =237+0.634×a steel pipe Rt 0.5, and a fitting goodness R 2 = 0.6641;
wherein, the steel plate Rt 2.0 and the steel pipe Rt 0.5 have the best fitting goodness, so the steel plate stress value Rt 2.0 with the largest fitting goodness is taken as the stress characterization parameter of the steel plate;
Based on the linear relationship obtained by the fitting, the steel plate Rt 2.0 =144+0.766×Steel pipe Rt 0.5 was substituted into the upper and lower limits Rt 0.5max (675 MPa) and Rt 0.5min (555 MPa) of the steel pipe yield strength control to obtain:
target Rt 2.0min =144+0.766×555=569 MPa of the steel sheet;
target Rt 2.0max =144+0.766×675=661 MPa of the steel sheet.
(3) According to the expansion rate meeting the requirement of 0.3% -1.3%, calculating to obtain the width of the steel plate to be no less than 3741mm;
Determining a steel plate manufacturing process according to a target Rt 2.0min (569 MPa) and a target Rt 2.0max (661 MPa) of the steel plate, namely, a target Rt 2.0 range of the steel plate is 569-661MPa, and optimizing and adjusting the manufacturing process according to the target Rt 2.0 range in a production inspection process so that the actual measured Rt 2.0 of the manufactured finished steel plate falls within the target range 569-661MPa as far as possible;
the transverse tensile test is carried out on the finished steel plate, so as to respectively obtain the stress strain curve and the actual measurement Rt 2.0 (the result is shown in table 2) of the finished steel plate,
TABLE 2
According to the tensile test results of the finished steel plates in table 2, the expansion rate in the pipe making process is determined:
For the steel plate # 1, rt 2.0 <569MPa (i.e., the target Rt 2.0min lower limit value), finding out Rt 2.5＝575Mpa,569MPa＜Rt2.5 <661MPa on the stress-strain curve of the steel plate # 1, and expanding the steel plate # 1 in the subsequent mechanical expansion according to the actual expansion ratio of (k+x 1 -x)% = (0.8+2.5-2.0)% = 1.3%;
For the No. 2, no. 3, no. 4 and No. 5 steel plates, the actual measurement Rt 2.0 of the steel plates falls into the range of 569-661MPa, the No. 2, no. 3, no. 4 and No. 5 steel plates are expanded according to the target expansion rate of 0.8% in the subsequent mechanical expansion;
For a 6# steel plate, rt 2.0 >661MPa (namely a target Rt 2.0max upper limit value), finding out that Rt 1.7 =650 <661MPa on a stress-strain curve of the 6# steel plate, and expanding the 6# steel plate according to the actual expansion rate of (k+x 2 -x)% = (0.8+1.7-2.0)% = 0.5% in the subsequent mechanical expansion;
(4) According to the actual expansion rates of the No. 1, no. 2, no. 3, no. 4, no. 5 and No. 6 steel plates obtained in the step (3), the widths of the steel plates after edge milling are calculated as follows:
No. 1 steel plate 3706mm
No. 2, no. 3, no. 4 and No. 5 steel plates of 3725mm
No. 6 steel plate 3735mm
And obtaining the actual width of the steel plate before forming according to the calculation, and adjusting the edge milling process according to the actual width, so that the width of the steel plate before forming obtained after edge milling meets the calculation value.
(5) And when the mechanical diameter expansion is carried out, the same diameter expansion parameters are adopted for all the welded pipes, the outer circumferential lengths of all the expanded steel pipes are 3830mm, and after the diameter expansion, the post treatment is carried out, thus obtaining the oil gas conveying steel pipe.
Tensile test was performed on tensile test pieces of the oil and gas conveying steel pipes prepared as described above, and the results are shown in Table 3, and the yield strengths of the pipes all fall within the target control range of 555-675 MPa.
TABLE 3 Table 3
| Steel pipe numbering | Rt0.5 |
| 1# (From a 1# steel plate) | 573 |
| 2# (From a 2# steel plate) | 620 |
| 3# (Made of 3# steel plate) | 600 |
| 4# (From 4# steel plate) | 615 |
| No. 5 (made of No. 5 steel plate) | 595 |
| No. 6 (made of No. 6 steel plate) | 645 |
Example 2
Preparing X70 (D1016X 17.5 mm) steel tube, with yield strength controlled in 485-585MPa
(1-1) Steel pipe yield strength control target, lower limit Rt 0.5min =485 MPa, upper limit Rt 0.5max =585 MPa.
(1-2) According to the outer circumference D=3192 mm, the wall thickness t=17.5 mm, the target expansion rate of 0.9% and the forming expansion of 5mm of the expanded steel pipe, the calculation is carried out:
Target plate width of steel plate after edge milling
Plastic strain in the center of wall thickness during tubing
(2) The method-II is adopted to obtain the value of x in the stress characterization parameter Rtx of the steel plate, and the lower limit value and the upper limit value of the target Rtx of the steel plate:
The value of x in the stress characterization parameter Rtx of the steel plate=epsilon 1 +0.5=1.06+0.5=1.56, so Rt 1.56 is selected as the stress characterization parameter of the steel plate, and the following calculation results:
Target Rt 1.56min＝Rt0.5min +10 (safety margin) =485+10=495 MPa of the steel sheet;
Target Rt 1.56max＝Rt0.5max -10 (safety margin) =585-10=575 MPa of the steel sheet;
(3) According to the expansion rate meeting the requirement of 0.4% -1.4%, calculating to obtain the width of the steel plate to be not less than 3118mm;
determining a steel plate manufacturing process according to a target Rt 1.56min (495 MPa) and a target Rt 1.56max (575 MPa) of the steel plate, namely, the target Rt 1.56 range of the steel plate is 495-575MPa, and optimizing and adjusting the manufacturing process according to the target Rt 1.56 range in the production inspection process so that the actual measured Rt 1.56 of the manufactured finished steel plate falls within the target range 495-575MPa as far as possible;
The transverse tensile test is carried out on the finished steel plate, so as to respectively obtain the stress strain curve and the actual measurement Rt 1.56 (the result is shown in table 4) of the finished steel plate,
TABLE 4 Table 4
| Numbering of finished steel plates | Actual measurement Rt 1.56 |
| 7# | 486 |
| 8# | 515 |
| 9# | 520 |
| 10# | 580 |
According to the tensile test results of the finished steel plates in table 4, the expansion rate in the pipe making process is determined:
For the 7# steel plate, rt 1.56 <495MPa (i.e., the target Rt 1.56min lower limit value), finding out Rt 1.9＝496Mpa,495MPa＜Rt1.9 <575MPa on the stress-strain curve of the 7# steel plate, and expanding the 7# steel plate in the subsequent mechanical expansion according to the actual expansion ratio of (k+x 1 -x)% = (0.9+1.9-1.56)% = 1.24%;
For the 8# steel plate and the 9# steel plate, the actually measured Rt 1.56 of the steel plates fall into the range of 495-575MPa, and the 8# steel plate and the 9# steel plate are expanded according to the target expansion rate of 0.9% in the subsequent mechanical expansion;
For a 10# steel plate, rt 1.56 >575MPa (i.e., a target Rt 1.56max upper limit value), finding out that Rt 1.2 =570 <575mpa on a stress-strain curve of the 10# steel plate, and expanding the 10# steel plate in a subsequent mechanical expansion according to an actual expansion ratio of (k+x 2 -x)% = (0.9+1.2-1.56)% =0.54%;
(4) According to the actual expansion rates of the No. 7, no. 8, no. 9 and No. 10 steel plates obtained in the step (3), the widths of the steel plates after edge milling are calculated as follows:
No. 7 steel plate 3092mm
No. 8 and No. 9 steel plates with the diameter of 3102mm
10# Steel plate 3113mm
And obtaining the actual width of the steel plate before forming according to the calculation, and adjusting the edge milling process according to the actual width, so that the width of the steel plate before forming obtained after edge milling meets the calculation value.
(5) And when the mechanical diameter expansion is carried out, the same diameter expansion parameters are adopted for all the welded pipes, the outer circumferential lengths of all the expanded steel pipes are 3192mm, and after the diameter expansion, the oil gas conveying steel pipes are obtained by post treatment.
Tensile test was conducted on the tensile test pieces of the oil and gas transmission steel pipes prepared as described above, the results are shown in Table 5,
The yield strength of each tube falls within the 485-585MPa target control range.
TABLE 5
| Steel pipe numbering | Rt0.5 |
| # 7 (Made of # 7 steel plate) | 500 |
| 8# (Made of 8# steel plate) | 519 |
| 9# (From 9# Steel plate) | 530 |
| 10# (From 10# Steel plate) | 565 |
From the above examples 1 and 2, it can be seen that by adopting the method for preparing the oil-gas conveying steel pipe provided by the invention, the yield strength of the prepared steel pipe can fall into the target control range, the problem of large fluctuation range of the yield strength of the oil-gas conveying steel pipe is effectively solved, the coordination deformability of the pipeline is further improved, the safety of the oil-gas pipeline is improved, and the requirement of high-quality development of the oil-gas pipeline on high-performance uniformity steel pipe products is met.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (10)
1. A method of making an oil and gas delivery steel pipe comprising:
(1) Determining a yield strength control target of the steel pipe to be prepared, wherein the target lower limit value of the yield strength is Rt 0.5min, and the target upper limit value of the yield strength is Rt 0.5max;
(2) Obtaining a numerical value of x in a stress characterization parameter Rtx of a steel plate before forming, and obtaining a lower limit value and an upper limit value of the target Rtx of the steel plate before forming according to a target lower limit value Rt 0.5min of the yield strength of the steel pipe to be prepared and a target upper limit value Rt 0.5max of the yield strength, wherein the lower limit value is a target Rtxmin, and the upper limit value is a target Rtxmax;
(3) Determining a steel plate manufacturing process according to the target Rtx, preparing and obtaining the steel plate before forming, and carrying out a tensile test on the steel plate before forming to obtain a stress strain curve and an actual Rtx of the steel plate before forming;
(4) Calculating to obtain the width of the steel plate required by forming according to the actual diameter expansion rate, and milling edges of the steel plate before forming according to the width of the steel plate required by forming to obtain the steel plate required by forming;
(5) And (3) forming and welding the steel plate required by forming, and mechanically expanding all welded pipes by adopting the same diameter expansion parameters to obtain the oil gas conveying steel pipe.
2. The method of claim 1, wherein in step (3), the method of obtaining the actual expansion rate comprises:
when the target Rtxmin is smaller than or equal to the actually measured Rtx is smaller than or equal to the target Rtxmax, the steel plate before forming is expanded in the mechanical expansion process according to the actual expansion rate of k%, wherein k% is the target expansion rate;
When the actually measured Rtx is smaller than a target Rtxmin, searching a point with the strain of x 1% on a stress-strain curve of the steel plate before forming, and meeting the target Rtxmin-Rtx 1 -Rtxmax, wherein the steel plate before forming is expanded according to the actual expansion rate of (k+x 1 -x)% in the mechanical expansion process of the pipe making;
When Rtx is actually measured to be more than or equal to target Rtxmax, a point with the strain of x 2% is searched on a stress-strain curve of the steel plate before forming, the target Rtxmin which is less than or equal to Rtx 2 which is less than or equal to target Rtxmax is met, and the steel plate before forming is expanded according to the actual expansion rate of (k+x 2 -x)% in the mechanical expansion process of the pipe.
3. The method according to claim 1 or 2, wherein step (1) further comprises obtaining a target width W 1 of the steel sheet required for forming and a target plastic strain ε 1 of a wall thickness center during pipe making, wherein,
W1=(D-t)×π/(1+k%)–δ;
ε1＝k+100δ/W1;
D is the outer circumference of the steel pipe to be prepared, t is the wall thickness of the steel pipe to be prepared, k% is the target diameter expansion rate, and delta is the molding expansion.
4. A method according to claim 3, wherein in step (2), the method of obtaining the value of x in the stress-characterizing parameter Rtx of the steel sheet before forming and the lower and upper limit values of the target Rtx comprises:
Selecting N steel plate samples with the corresponding set specification of the steel pipe to be prepared, respectively obtaining stress strain curves of the N corresponding steel plate samples through a tensile test, selecting M steel plate strain values based on a preset interval a% in each corresponding stress strain curve by taking (epsilon 1 +delta epsilon)% as a standard to obtain M steel plate stress values corresponding to different strain values, and obtaining N steel plate stress values corresponding to M groups of different strain values and each group of same strain value by taking the stress curve of the N corresponding steel plate samples and the M steel plate stress values corresponding to different strain values as a group, wherein N is more than or equal to 5, M is more than or equal to 3, and delta epsilon is a parameter corresponding to a yield strength selection standard of the steel pipe to be prepared;
(2-2) respectively preparing N steel pipe samples according to parameters of the steel pipes to be prepared and corresponding to steel pipe samples with preset specifications, and obtaining stress-strain curves of the N steel pipe samples and yield strength values of the N steel pipe samples corresponding to the strain values delta epsilon% through a tensile test;
(2-3) obtaining M fitting straight lines through straight line fitting based on the obtained N steel plate stress values corresponding to the same strain value and N steel pipe sample yield strength values corresponding to the strain value delta epsilon%, wherein the fitting straight line RtDeltax=a+b which corresponds to the fitting goodness with the largest value in the M fitting straight lines is taken as the value of x in the stress characterization parameter Rtx;
Calculating the lower limit value and the upper limit value of the target Rtx of the steel plate before forming based on a fitting straight line RtDeltax=a+b×the steel pipe Rt 0.5 corresponding to the fitting goodness with the maximum value,
Target Rtxmin =a+b×target Rt 0.5min+c1 of the steel pipe to be produced;
Target Rtxmax =a+b×target Rt 0.5max+d1 of the steel pipe to be produced;
Where c 1、d1 is the safety margin.
5. The method of claim 4, wherein Δε is 0.5;
and/or, in the step (2-1), the steel plate sample is a transverse sampling sample;
And/or (2-1), the method for obtaining the stress values of the M steel plates comprises taking epsilon 1 +delta epsilon as the center and taking the left and right sides of the center respectively based on the preset interval a in the stress-strain curves of the N corresponding steel plate samples The stress values are used for obtaining corresponding M steel plate stress values;
wherein a >0;M is an odd number;
6. The method according to claim 4 or 5, wherein in the step (2-3), the method for obtaining the goodness of fit is as follows:
Wherein x i is a steel plate stress value variable, y i is a steel pipe sample yield strength value variable, Is the stress average value corresponding to the same strain value of N steel plates,The average value of yield strengths corresponding to the N steel pipe samples is given.
7. The method according to claim 4 or 5, wherein in the step (2-3), 0.ltoreq.c 1≤20;-20≤d1.ltoreq.0.
8. A method according to claim 3, wherein in step (2), the method of obtaining the value of x in the stress-characterizing parameter Rtx of the steel sheet before forming and the lower and upper limit values of the target Rtx comprises:
The numerical value of x in the stress characterization parameter Rtx of the steel plate before forming is =epsilon 1 +0.5;
Target Rtxmin = target Rt 0.5min+c2 of the steel pipe to be prepared;
target Rtxmax = target Rt 0.5max+d2 of the steel pipe to be prepared;
Where c 2、d2 is the safety margin.
9. The method of claim 8, wherein 0.ltoreq.c 2≤20;-20≤d2.ltoreq.0.
10. The method according to claim 1 or 2, wherein in the step (3), a lower limit value W 2 of a production width of the steel sheet before forming is obtained before the steel sheet before forming is produced, wherein,
W 2 = (D-t) x pi/(1+k '%) - δ, wherein k'% = k% -0.5%;
D is the outer circumference of the steel pipe to be prepared, t is the wall thickness of the steel pipe to be prepared, k% is the target diameter expansion rate, and delta is the molding expansion.
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