CN112474868A - Hot rolling production process for rolling seamless tube with large diameter expansion - Google Patents
Hot rolling production process for rolling seamless tube with large diameter expansion Download PDFInfo
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- CN112474868A CN112474868A CN202011120948.2A CN202011120948A CN112474868A CN 112474868 A CN112474868 A CN 112474868A CN 202011120948 A CN202011120948 A CN 202011120948A CN 112474868 A CN112474868 A CN 112474868A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 42
- 238000005098 hot rolling Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000004513 sizing Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 9
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 239000010955 niobium Substances 0.000 claims description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 6
- 238000009785 tube rolling Methods 0.000 claims description 5
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 23
- 239000010959 steel Substances 0.000 abstract description 23
- 238000012827 research and development Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a hot rolling production process for rolling a seamless tube by large diameter expansion, which relates to the field of steel tube production and comprises the following steps: A. inspecting the tube blank; B. cutting off the tube blank; C. heating by using a ring furnace; D. perforating the cut tube blank; E. rolling a pipe; F. sizing; G. cooling by a chain type cooling bed; H. correcting; I. sawing; J. nondestructive flaw detection; K. and (5) manually checking, packaging and warehousing. The invention solves the problem of expanding the large-diameter seamless pipe product produced by small billets, adopts the large-deformation and large-angle roller, comprehensively improves the expanding capacity of a unit, and the like. The production process is suitable for producing large-diameter seamless tube products from small billets, mainly develops the research and development aiming at the process characteristics difficult to expand, and produces the seamless tube products of various specifications.
Description
Technical Field
The invention relates to the field of steel pipe production, in particular to a hot rolling production process for rolling a seamless pipe through large diameter expansion.
Background
A Seamless Steel pipe (Seamless Steel Tube) is a long Steel material having a hollow cross section and no seam at the periphery. The steel ingot or solid pipe blank is made into a tubular billet through perforation, and then the tubular billet is made into a tubular billet through hot rolling, cold rolling or cold drawing. Steel pipes have a hollow cross section and are used in large numbers as pipes for transporting fluids, such as oil, gas, water and certain solid materials. From 2006 to 2008, the seamless steel pipe imported from china in the united states increased 131.52%, and the amount increased to about $ 3.82 billion. The output of the seamless steel tube in China is 248 ten thousand tons in 10 months in 2012, and is increased by 8.6 compared with the same period in the last year; the cumulative production of the seamless steel pipes in China in 1-10 months reaches 2285.9 ten thousand tons, and the cumulative year-on-year increase is 6.9 percent.
The existing seamless pipe production adopts a large-caliber round billet or a round billet with equal caliber, and no related technology exists for producing the large-caliber seamless pipe by adopting a small caliber.
Disclosure of Invention
The invention aims to provide a hot rolling production process for rolling a seamless tube by expanding the diameter greatly.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hot rolling production process for rolling a seamless tube with large diameter expansion comprises the following steps:
A. inspecting the tube blank;
B. cutting off the tube blank;
C. heating by using a ring furnace;
D. perforating the cut tube blank;
E. rolling a pipe;
F. sizing;
G. cooling by a chain type cooling bed;
H. correcting;
I. sawing;
J. nondestructive flaw detection;
K. and (5) manually checking, packaging and warehousing.
Further, the tube blank needs to be selected according to requirements before the step A, and the indexes of the tube blank need to meet the following requirements: allowable deviation of diameter:
ovality: the diameter tolerance is +/-1.5 mm; length tolerance: 0 to + 50; end face inclination: not more than 5 mm; curvature: the thickness of each meter is not more than 6 mm.
Further, in the heating procedure of the annular furnace, the heating rate is 10min/cm, and the heating temperature cannot exceed the specified maximum temperature by more than 10 ℃; when the pipe blank is transferred to a discharging furnace opening, closing or closing the burner on the discharging opening to ensure that the temperature is adjusted to the rolling required temperature; each discharge branch is poured to the bottom of the furnace in time, so that the materials return to the inside of the partition wall; when rolling and discharging, closing the flue gate to ensure that the hearth can ensure the hearth pressure required by rolling; the temperature of each heating section in the annular furnace is set as follows: the preheating section is 750-800 ℃, the first section is heated to 900-950 ℃, the second section is heated to 1150-1200 ℃, the third section is heated to 1200-1250 ℃, and the discharge port is heated to 1250-1280 ℃.
Furthermore, in the punching process, a rolling process with large deformation and low rolling speed is adopted, the reduction rate is 5.5-8%, the pre-top reduction rate is 5.5-7.6%, the punching speed is 0.2m/s, and the knurling of a punching roller is 0.4 mm. The material of the perforating roller is 60CrMnMo, and the guide plate is made of high-nickel alloy. The plug is a common 20CrNi4 plug. The temperature of the capillary after being penetrated is 1230-1250 ℃.
Further, in the above tube rolling step, the wall reduction amount was 1.6mm, the rolling reduction amount was 8%, the rolling speed was 0.4m/s, and the roll knurling depth was 0.3 mm. The material of the roller of the tube rolling mill adopts 40CrNiMo, the material of the core rod adopts 42CrMo, the material of the rolled plate is high nickel alloy, and the temperature of the pierced billet after rolling is 1150-1200 ℃.
Further, in the sizing procedure, the temperature of the pierced billet before sizing is 950-1100 ℃, and the temperature after sizing is 900-1000 ℃.
Further, in the cooling step, a chain cooling bed is used to cool the material to room temperature.
Furthermore, room temperature correction is adopted, and the bending degree of the niobium and niobium alloy pipe after the correction process is less than or equal to 1.0 mm.
Further, the machine used in the straightening process is a seven-roll straightener.
Has the advantages that: the invention solves the problem of expanding the large-diameter seamless pipe product produced by small billets, adopts the large-deformation and large-angle roller, comprehensively improves the expanding capacity of a unit, and the like. The production process is suitable for producing large-diameter seamless tube products from small billets, mainly develops the research and development aiming at the process characteristics difficult to expand, and produces the seamless tube products of various specifications.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, a hot rolling production process for rolling a seamless tube with large diameter expansion comprises the following steps:
A. inspecting the tube blank; the round pipe blank is selected according to requirements before A, and the indexes of the round pipe blank must meet the following requirements: allowable deviation of diameter:
ovality: the diameter tolerance is +/-1.5 mm; length tolerance: 0 to + 50; end face inclination: not more than 5 mm; curvature: the thickness of each meter is not more than 6 mm.
B. Cutting off the tube blank; the hardness of the steel pipe blank is high, and the steel pipe blank is cut by a saw blade; the cutting machine comprises a base and a rotating shaft, wherein a plurality of shaft rollers which are transversely arranged uniformly are arranged on the base, the middle of each shaft roller is inwards sunken to bear a steel pipe blank, and each shaft roller is driven to rotate by a motor matched with a chain, so that the steel pipe blanks are conveyed by the rotation of the shaft rollers; and a plurality of rolling shafts are arranged between the shaft rollers, the rolling shafts are positioned below the steel pipe blank and at the same height with the shaft rollers, the rolling shafts are driven to rotate by a motor, the rotating direction of the rolling shafts is vertical to that of the shaft rollers, namely the rolling shafts are used for driving the steel pipe blank to perform autorotation motion. The rotating shaft and the steel pipe blank are arranged on the base in parallel, a plurality of gas cutting guns with uniform intervals are arranged on the rotating shaft, and when the rotating shaft rotates back and forth, the gas cutting guns can be close to or far away from the steel pipe blank. The working process is as follows: the rotating shaft rotates to drive the gas cutting gun to be close to the steel pipe blank, the rolling shaft rotates to drive the steel pipe blank to rotate, the gas cutting gun is started to pre-cut the steel pipe blank and then is closed, then the rotating shaft rotates, the gas cutting gun is far away from the steel pipe blank, the shaft roller rotates to convey the cut steel pipe blank away, and the heating step is carried out.
C. Heating by using a ring furnace; in the heating procedure of the annular furnace, the heating rate is 10min/cm, and the heating temperature cannot exceed the specified maximum temperature by more than 10 ℃; when the pipe blank is transferred to a discharging furnace opening, closing or closing the burner on the discharging opening to ensure that the temperature is adjusted to the rolling required temperature; each discharge branch is poured to the bottom of the furnace in time, so that the materials return to the inside of the partition wall; when rolling and discharging, closing the flue gate to ensure that the hearth can ensure the hearth pressure required by rolling; the temperature of each heating section in the annular furnace is set as follows: the preheating section is 750-800 ℃, the first section is heated to 900-950 ℃, the second section is heated to 1150-1200 ℃, the third section is heated to 1200-1250 ℃, and the discharge port is heated to 1250-1280 ℃.
D. Perforating the cut tube blank; the rolling process with large deformation and low rolling speed is adopted, the reduction rate is 5.5-8%, the pre-top reduction rate is 5.5-7.6%, the perforation speed is 0.2m/s, and the knurling of a perforation roller is 0.4 mm. The material of the perforating roller is 60CrMnMo, and the guide plate is made of high-nickel alloy. The plug is a common 20CrNi4 plug. The temperature of the capillary after being penetrated is 1230-1250 ℃.
E. Rolling a pipe; the wall reduction amount is 1.6mm, the reduction amount is 8%, the rolling speed is 0.4m/s, and the knurling depth of the roller is 0.3 mm. The material of the roller of the tube rolling mill adopts 40CrNiMo, the material of the core rod adopts 42CrMo, the material of the rolled plate is high nickel alloy, and the temperature of the pierced billet after rolling is 1150-1200 ℃.
F. Sizing; the temperature of the pierced billet before sizing is 950-1100 ℃, and the temperature after sizing is 900-1000 ℃.
G. Cooling by a chain type cooling bed; cooling to room temperature by using a chain cooling bed.
H. Correcting; the niobium and niobium alloy pipe has the curvature less than or equal to 1.0mm after the correction process at room temperature. The machine used in the straightening process is a seven-roller straightening machine.
I. Sawing; and conveying the seamless pipe to an automatic pipe cutting machine, and cutting and processing two ends of the seamless pipe to meet the standard requirement of a finished pipe.
J. Nondestructive flaw detection; adopting ultrasonic nondestructive flaw detection equipment to carry out eddy current flaw detection on the seamless tube, ensuring that the product has no defects of Liwen, layering, sand holes, pit falling and the like, and filling in original flaw detection records
K. And (5) manually checking, packaging and warehousing. The quality inspection department is responsible for inspecting the chemical components, physical properties, water pressure, impact energy and other contents of each batch of niobium tubes, measuring the surface appearance quality, outer diameter, ovality, wall thickness, length and straightness of the niobium tubes, measuring the drift diameter of each niobium tube, and filling in an appearance inspection record table, a finished product dimension inspection record table, a drift diameter record table, a finished product chemical inspection record table, a tensile test record table and an eddy current flaw detection original record table. And packaging the qualified products according to the requirements of customers, and filling packaging records and warehousing notes.
The product has various materials such as 20#, 45#, Q345B and the like. The diameter specification of the product is phi 351 and 426mm, and the wall thickness specification is 10-35.0 mm. The product length ranges from 10m to 12.5 m.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A hot rolling production process for rolling a seamless tube with large diameter expansion is characterized by comprising the following steps of: the method comprises the following steps:
A. inspecting the tube blank;
B. cutting off the tube blank;
C. heating by using a ring furnace;
D. perforating the cut tube blank;
E. rolling a pipe;
F. sizing;
G. cooling by a chain type cooling bed;
H. correcting;
I. sawing;
J. nondestructive flaw detection;
K. and (5) manually checking, packaging and warehousing.
2. A hot-rolling process for rolling a seamless tube with a large diameter according to claim 1, wherein the tube blank is selected as required before step A, and the indexes of the tube blank are as follows: allowable deviation of diameter:
ovality: the diameter tolerance is +/-1.5 mm; length tolerance: 0 to + 50; end face inclination: not more than 5 mm; curvature: the thickness of each meter is not more than 6 mm.
3. A hot-rolling process for producing a large-diameter-expanded rolled seamless tube according to claim 1, wherein in the heating step in the ring furnace, the heating rate is 10min/cm, and the heating temperature does not exceed a predetermined maximum temperature by 10 ℃ or more; when the pipe blank is transferred to a discharging furnace opening, closing or closing the burner on the discharging opening to ensure that the temperature is adjusted to the rolling required temperature; each discharge branch is poured to the bottom of the furnace in time, so that the materials return to the inside of the partition wall; when rolling and discharging, closing the flue gate to ensure that the hearth can ensure the hearth pressure required by rolling; the temperature of each heating section in the annular furnace is set as follows: the preheating section is 750-800 ℃, the first section is heated to 900-950 ℃, the second section is heated to 1150-1200 ℃, the third section is heated to 1200-1250 ℃, and the discharge port is heated to 1250-1280 ℃.
4. The hot rolling process for rolling a seamless tube with a large diameter according to claim 1, wherein in the piercing step, a rolling process with a large deformation amount and a low rolling speed is adopted, the reduction rate is 5.5-8%, the reduction rate before the top is 5.5-7.6%, the piercing speed is 0.2m/s, the knurling of the piercing roll is 0.4mm, the material of the piercing roll is 60CrMnMo, and the guide plate is made of high nickel alloy; the top adopts a common 20CrNi4 top, and the temperature of the capillary tube after being penetrated is 1230-1250 ℃.
5. A hot rolling process for producing a large diameter-expanded rolled seamless tube according to claim 1, wherein in the tube rolling step, the wall reduction amount is 1.6mm, the reduction amount is 8%, the rolling speed is 0.4m/s, and the roll knurling depth is 0.3 mm; the material of the roller of the tube rolling mill adopts 40CrNiMo, the material of the core rod adopts 42CrMo, the material of the rolled plate is high nickel alloy, and the temperature of the pierced billet after rolling is 1150-1200 ℃.
6. A hot rolling process for producing a large diameter-expanded rolled seamless tube according to claim 1, wherein in the sizing step, the temperature of the pierced blank before sizing is 950 ℃ to 1100 ℃ and the temperature after sizing is 900 ℃ to 1000 ℃.
7. A hot-rolling process for producing a large-diameter-expanded rolled seamless tube according to claim 1, wherein in the cooling step, the tube is cooled to room temperature by a chain cooling bed.
8. The hot rolling process for producing a large diameter-expanded rolled seamless tube according to claim 1, wherein room temperature straightening is adopted, and the degree of bending of the niobium and niobium alloy tube after the straightening step is less than or equal to 1.0 mm.
9. The hot rolling process for rolling a seamless tube with a large diameter according to claim 8, wherein the machine used in the straightening step is a seven-roll straightener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120948.2A CN112474868A (en) | 2020-10-20 | 2020-10-20 | Hot rolling production process for rolling seamless tube with large diameter expansion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120948.2A CN112474868A (en) | 2020-10-20 | 2020-10-20 | Hot rolling production process for rolling seamless tube with large diameter expansion |
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| CN112474868A true CN112474868A (en) | 2021-03-12 |
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| CN202011120948.2A Pending CN112474868A (en) | 2020-10-20 | 2020-10-20 | Hot rolling production process for rolling seamless tube with large diameter expansion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733927A (en) * | 2022-04-21 | 2022-07-12 | 山东汇通工业制造有限公司 | Seamless steel pipe for 40CrB track pin bush |
| WO2024032155A1 (en) * | 2022-08-12 | 2024-02-15 | 鑫鹏源(聊城)智能科技有限公司 | Hot rolling production process for large-diameter rolled seamless tube |
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| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| CN202762726U (en) * | 2012-09-06 | 2013-03-06 | 济南重工股份有限公司 | Production unit for hot-rolled seamless steel tubes |
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| CN106734328A (en) * | 2016-11-28 | 2017-05-31 | 鑫鹏源智能装备集团有限公司 | A kind of hot rolling large-diameter thin-wall titanium alloy seamless pipe production technology |
| CN111001659A (en) * | 2019-12-11 | 2020-04-14 | 扬州诚德钢管有限公司 | Production method of seamless steel tube with diameter of 1700-2000mm |
-
2020
- 2020-10-20 CN CN202011120948.2A patent/CN112474868A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919530A (en) * | 2006-09-11 | 2007-02-28 | 何龙 | Manufacturing technique of heavy caliber alloy seamless steel pipe |
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733927A (en) * | 2022-04-21 | 2022-07-12 | 山东汇通工业制造有限公司 | Seamless steel pipe for 40CrB track pin bush |
| WO2024032155A1 (en) * | 2022-08-12 | 2024-02-15 | 鑫鹏源(聊城)智能科技有限公司 | Hot rolling production process for large-diameter rolled seamless tube |
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Application publication date: 20210312 |