CN115290443A - Method for evaluating mechanical tensile strength of T/P92 steel - Google Patents
Method for evaluating mechanical tensile strength of T/P92 steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 9
- 238000012935 Averaging Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 12
- 238000007546 Brinell hardness test Methods 0.000 abstract description 6
- 238000011156 evaluation Methods 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000010977 unit operation Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 13
- 238000010998 test method Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000001066 destructive effect Effects 0.000 description 6
- 239000007769 metal material Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 239000012212 insulator Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 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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- 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
- G01N3/40—Investigating hardness or rebound hardness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides an evaluation method of mechanical tensile strength of T/P92 steel, which obtains tensile strength performance of T/P92 steel part materials which cannot be directly detected in the actual use process by adopting a convenient and efficient Brinell hardness test through the quantitative relation between the provided Brinell hardness and the strength, thereby realizing mastering and evaluation of the bearing capacity and the safety of the parts used on site, avoiding the damage and the influence of direct maintenance cost increase, time cost increase and the like caused by pipe cutting and sampling, and being particularly beneficial to improving the economic benefit of unit operation.
Description
Technical Field
The invention relates to a mechanical tensile property test evaluation method, in particular to an evaluation method of mechanical tensile strength of T/P92 steel.
Background
In recent years, clean and efficient ultra-supercritical power generation technology is rapidly developed and applied to large-scale business in China. The T/P92 steel is W-containing martensite heat-resistant steel with the content of 9% Cr, has high heat-strength performance, is a superheater, a reheater and a header of an ultra-supercritical unit with the temperature of 600-630 ℃, and is particularly widely applied to the excellent selected materials of high-temperature main steam and reheat steam pipelines.
High temperature steam components (including pipes and tubes) need to have certain mechanical strength, and the strength of the material tends to deteriorate under the action of temperature and steam pressure. The strength of the material is determined, generally according to GB/T228.1-2021 part 1 of the tensile test for metallic materials: the room temperature test method requires cutting and sampling a pipe for destructive testing, and is difficult to be effectively applied in actual production due to the limitations of incapability of sampling, impossibility of sampling in large quantity, long time consumption caused by sampling and replacement of pipes or pipelines, increased maintenance cost and the like. The hardness can represent the mechanical property of the material, and the hardness detection has the characteristics of simple and convenient operation, non-destructive property and the like, and is widely applied in production practice. Various studies prove that the hardness of steel has a strong linear relation with the strength.
In the prior art, for mechanical strength evaluation of T/P92 steel in a using process, a destructive method is usually adopted, and a whole section of pipe is required to be sampled and then a related test is carried out, so that on one hand, sampling can not be completed due to sampling conditions, and on the other hand, problems of cost increase, delayed unit operation and the like can be caused even if sampling is completed. In recent years, minimally invasive techniques such as the small punch method have been used to evaluate the tensile properties of materials, but it has also been necessary to perform local destructive sampling on the surface of the pipe, the test is inefficient due to limitations in sampling and sample preparation, and such methods are not suitable if the pipe is thin in thickness.
Chinese patent publication No. CN101788423A discloses special equipment and a test method for mechanical tensile strength tests of suspension insulator caps, which belong to equipment and a method for material strength tests, in particular to equipment and a method for tensile strength tests of suspension insulator caps. The test method of the special device for the mechanical tensile strength test of the suspension insulator iron cap is characterized in that: the conical pull rod is placed into the inverted iron cap, the tensioning lump is placed into the iron cap hole and surrounds the periphery of the conical pull rod, the lower pull rod is placed into the cap pit of the iron cap, the lower pull rod is clamped on the lower fixing clamp of the testing machine, and the conical pull rod is clamped on the upper fixing clamp of the testing machine, so that the tensile test can be carried out. However, the method cannot solve the problem of evaluating the mechanical strength of the same type of steel sections in the use process.
Disclosure of Invention
The invention aims to provide a method for quickly evaluating the mechanical tensile strength of T/P92 steel by utilizing the Brinell hardness which is convenient and easy to obtain.
In order to solve the technical problem, the invention provides a method for evaluating the mechanical tensile strength of T/P92 steel, which comprises the following steps:
s1: selecting n measuring points on the surface of the T/P92 steel part which is actually used, and respectively measuring the actual Brinell hardness value HBW of each point 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n ；
S2: the Brinell hardness value HBW of each point is measured 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n The average is obtained to obtain the actual brinell hardness value HBW, i.e., HBW = (HBW) 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i +…HBW n ) Acquiring the Brinell hardness value HBW of the surface of the T/P92 steel part which is actually used; and
s4: according to the Brinell hardness numberHBW, and then the tensile strength R is calculated according to a quantitative linear relation formula between the mechanical tensile strength (tensile strength and yield strength) and the Brinell hardness of the T/P92 steel which is actually used m And yield strength R P0.2 ：
The quantitative relationship between strength and hardness of T/P92 steel is:
R m ＝k 1 ·HBW+A 1 (a)
R P0.2 ＝k 2 ·HBW+A 2 (b)
in formulae (a) and (b): r m 、RP 0.2 Tensile strength and yield strength (MPa) of the material at room temperature, respectively; k is a radical of 1 、k 2 、A 1 、A 2 Is a constant value k 1 ＝2.539，A 1 ＝176.93，k 2 ＝3.068，A 2 ＝-104.68。
Further, the following steps are included after the step S2 and before the step S4:
s3: comparison of measured Brinell hardness values HBW i With the average value HBW, if any measure HBW i Greater than m% from the average HBW, i.e., Δ HBW i ＝(|HBW-HBW i I))/HBW > m%, the HBW is discarded i Reselecting another measuring point HBW i ' and then averaging to further obtain a relatively accurate actual brinell hardness value HBW ', i.e., HBW ' = (HBW) 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i ′ +…HBW n )/n。
Furthermore, the number n of the measuring points in the step S1 is more than or equal to 5.
Still further, the number n of the measurement points in the step S1 is less than or equal to 10.
Further, m =5 to 10.
Still further, said m =5.
According to the invention, through the provided quantitative relation between the Brinell hardness and the strength, the tensile strength performance of the T/P92 steel part material which cannot be directly detected in actual use is obtained by adopting a convenient and efficient Brinell hardness test, so that the bearing capacity and the safety of the part used on site are mastered and evaluated, the damage and benefit influences of direct maintenance cost increase, time cost increase and the like caused by pipe cutting and sampling are avoided, and the economic benefit of unit operation is particularly promoted.
Drawings
FIG. 1 is a flowchart showing the steps of a first embodiment of a method for evaluating mechanical tensile strength of T/P92 steel according to the present invention.
FIG. 2 is a flowchart showing the steps of a second embodiment of the method for evaluating the mechanical tensile strength of T/P92 steel according to the present invention.
Detailed Description
The present invention is described in detail by examples below.
Referring to fig. 1, the steps of the first embodiment of the method for evaluating the mechanical tensile strength of T/P92 steel provided by the present invention are as follows:
s1: selecting a proper area of the surface of the tested T/P92 steel component, and carrying out surface treatment, wherein the surface quality generally conforms to GB/T231.1-2018 Brinell hardness test part 1 of metallic materials: the relevant requirements of test methods, then according to GB/T231.1-2018 Brinell hardness test for metallic materials part 1: test methods the method specified in the test methods selects n measurement points on the surface, typically n.gtoreq.5 and n.gtoreq.10, in this example 5 measurement points are selected, and the actual Brinell hardness value HBW of each point is measured separately 1 、HBW 2 、 HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n ；
S2: the Brinell hardness value HBW of each point 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n And (3) averaging to obtain an actual Brinell hardness value HBW, namely:
HBW＝(HBW 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i +…HBW n ) Acquiring the Brinell hardness value HBW of the surface of the T/P92 steel part which is actually used;
s4: according to the Brinell hardness value HBW and the T/P92 steel machinery in practical useThe tensile strength R is obtained by calculating a quantitative linear relation formula between the tensile strength (tensile strength and yield strength) and the Brinell hardness m And yield strength RP 0.2 ：
The quantitative relation between the strength and the hardness of the T/P92 steel is as follows:
R m ＝k 1 ·HBW+A 1 (a)
R P0.2 ＝k 2 ·HBW+A 2 (b)
in the above formulae (a) and (b): r m 、RP 0.2 Tensile strength and yield strength (MPa) of the material at room temperature, respectively; k is a radical of 1 、k 2 、A 1 、A 2 Is a constant value of k 1 ＝2.539，A 1 ＝176.93，k 2 ＝3.068，A 2 = -104.68, such that R tensile strength R mentioned above m And yield strength RP 0.2 It can be directly calculated according to the following formula:
R m ＝2.539HBW+176.93 (a)
R P0.2 ＝3.068HBW-104.68 (b)
referring to fig. 2, in order to further improve the accuracy of the method for evaluating the mechanical tensile strength of the T/P92 steel provided by the present invention, the steps of the second embodiment of the present invention are as follows:
s1: selecting a proper area of the surface of the tested T/P92 steel component, and carrying out surface treatment, wherein the surface quality is in accordance with GB/T231.1-2018 Brinell hardness test part 1 of metal materials: the relevant requirements of test methods, then according to GB/T231.1-2018 Brinell hardness test for metallic materials part 1: test methods the method specified in test methods selects n measurement points, in this example 5 measurement points, on the surface and measures the actual brinell hardness value HBW of each point separately 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i +…HBW n ；
S2: the Brinell hardness value HBW of each point is measured 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n The average is obtained to obtain the actual Brinell hardness value HBW, namely:
HBW＝(HBW 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i +…HBW n ) Acquiring the Brinell hardness value HBW of the surface of the T/P92 steel part which is actually used;
s3: comparison of measured Brinell hardness values HBW i With the average value HBW, if any measure HBW i Differs from the average HBW by more than m%, typically m is between 5 and 10, in this example 5%, Δ HBW is used i ＝(|HBW-HBW i I))/HBW > 5%, the HBW is discarded i Reselecting another measuring point HBW i ' and then averaging to further obtain a relatively accurate actual brinell hardness value HBW ', i.e., HBW ' = (HBW) 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i ′+…HBW n )/n。；
S4: according to the Brinell hardness value HBW', the tensile strength R is calculated and obtained according to a quantitative linear relation formula between the mechanical tensile strength (tensile strength and yield strength) and the Brinell hardness of the T/P92 steel which is actually used m ' and yield Strength R P0.2 ′：
The quantitative relationship between strength and hardness of T/P92 steel is:
R m ′＝k 1 ·HBW′+A 1 (a)
R P0.2 ′＝k 2 ·HBW′+A 2 (b)
in the above formulae (a) and (b): r m 、R P0.2 Tensile strength and yield strength (MPa) of the material at room temperature, respectively; k is a radical of 1 、k 2 、A 1 、A 2 Is a constant value of k 1 ＝2.539，A 1 ＝176.93，k 2 ＝3.068，A 2 = -104.68, such that R tensile strength R mentioned above m And yield strength R P0.2 It can be directly calculated according to the following formula:
R m ′＝2.539HBW′+176.93 (a)
R P0.2 ′＝3.068HBW′-104.68 (b)
it should be noted that the values of m and n mentioned above can achieve the object of the present invention, and in practical use, can be selected according to the requirements.
Through the above description, the present invention provides a method for evaluating mechanical tensile strength of T/P92 steel, which is based on the existing evaluation of tensile strength and yield strength, and adopts a research of firstly performing a component destructive sampling method, according to the national standard GB/T228.1-2021 part 1 of the metallic material tensile test: room temperature test method samples with different brinell hardness values are processed into standard test pieces, and then tensile test is carried out to obtain the test pieces. The quantitative relations provided by the application, namely the equations (a) and (b), are respectively tested and sampled for samples with different Brinell hardness values, and standard tests are carried out according to GB/T228.1-2021, so that the accurate tensile strength and yield strength of the samples under the hardness values are obtained; by carrying out a large number of corresponding batch strength tests under different Brinell hardness values, the quantitative relationship (namely the formula a and the formula b) between the Brinell hardness and the actual accurate strength is established. Through the quantitative relation, destructive sampling of actual parts is avoided, the problem which cannot be solved for a long time in the prior art is solved, namely, the tensile strength and the yield strength of the part material in actual use are obtained only through measurement of Brinell hardness values (the Brinell hardness measurement does not need destructive sampling, and the part in use can be directly measured), and researches and experiments further show that the method is accurate and reliable. Therefore, the bearing capacity and safety of the in-service parts can be mastered and evaluated, the damage and benefit influences of direct maintenance cost increase, time cost increase and the like caused by pipe cutting and sampling are avoided, and the economic benefit of unit operation is favorably improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for evaluating mechanical tensile strength of T/P92 steel, characterized by comprising the steps of:
s1, selecting n measuring points on the surface of an actually used T/P92 steel component, and respectively measuring the actual Brinell hardness value HBW of each point 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n ，
S2, measuring the Brinell hardness value HBW of each point 1 、HBW 2 、HBW 3 、HBW 4 、HBW 5 …HBW i …HBW n Averaging to obtain the actual Brinell hardness value HBW, i.e. HBW = (HBW) 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i +…HBW n ) Acquiring the Brinell hardness value HBW of the surface of a T/P92 steel part which is actually used; and
s4, according to the Brinell hardness value HBW and a quantitative linear relation formula between the mechanical tensile strength (tensile strength and yield strength) and the Brinell hardness of the T/P92 steel, calculating to obtain the tensile strength R m And yield strength R P0.2 ：
The quantitative relation between the strength and the hardness of the T/P92 steel is as follows:
R m ＝k 1 ·HBW+A 1 (a)
R P0.2 ＝k 2 ·HBW+A 2 (b)
in the formulae (a) and (b), R m 、R P0.2 Tensile strength and yield strength (MPa) of T/P92 steel at room temperature; k is a radical of 1 、k 2 、A 1 、A 2 Is a constant value k 1 ＝2.539，A 1 ＝176.93，k 2 ＝3.068，A 2 ＝-104.68。
Further, the following steps are included after the step S2 and before the step S4:
s3: comparison of measured Brinell hardness values HBW i With the average value HBW, if any measure HBW i Greater than m% from the average HBW, i.e., Δ HBW i ＝(|HBW-HBW i I))/HBW > m%, the HBW is discarded i Reselecting another measurement point HBW i 'then, the average value is found, so as to further obtain the relatively accurate actual brinell hardness value HBW', that is,
HBW＇＝(HBW 1 +HBW 2 +HBW 3 +HBW 4 +HBW 5 +…+HBW i ＇+…HBW n )/n。
2. the method for evaluating the mechanical tensile strength of T/P92 steel according to claim 1, wherein the number of measurement points n of step S1 is not less than 5.
3. The method for evaluating the mechanical tensile strength of T/P92 steel according to claim 1, wherein the number of measurement points n of step S1 is 10 or less.
4. The method of evaluating the mechanical tensile strength of the T/P92 steel according to claim 1, wherein m =5 to 10.
5. The method of evaluating the mechanical tensile strength of T/P92 steel according to claim 1, wherein m =5.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973708A (en) * | 2016-06-30 | 2016-09-28 | 共享铸钢有限公司 | Tensile strength assessment method of high-alloy heat resistant steel |
| CN110231237A (en) * | 2019-04-17 | 2019-09-13 | 华电电力科学研究院有限公司 | A kind of interconversion of hardness and strength method of thermoelectricity station-service F91 large size threeway forging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973708A (en) * | 2016-06-30 | 2016-09-28 | 共享铸钢有限公司 | Tensile strength assessment method of high-alloy heat resistant steel |
| CN110231237A (en) * | 2019-04-17 | 2019-09-13 | 华电电力科学研究院有限公司 | A kind of interconversion of hardness and strength method of thermoelectricity station-service F91 large size threeway forging |
Non-Patent Citations (1)
| Title |
|---|
| 徐开;谷树超;王瑞璇;王松;程宇飞;李俊;: "1000 MW超超临界锅炉T92/TP310HCbN钢管显微组织和力学性能分析", 焊接技术, vol. 49, no. 1, 20 October 2020 (2020-10-20), pages 36 - 40 * |
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