CN101660036B - Heat treating method of high strength and high ductility steel tube - Google Patents

Heat treating method of high strength and high ductility steel tube Download PDF

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Publication number
CN101660036B
CN101660036B CN200910070448XA CN200910070448A CN101660036B CN 101660036 B CN101660036 B CN 101660036B CN 200910070448X A CN200910070448X A CN 200910070448XA CN 200910070448 A CN200910070448 A CN 200910070448A CN 101660036 B CN101660036 B CN 101660036B
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steel tube
tempering
strength
temperature
treating method
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CN101660036A (en
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周家祥
张传友
江勇
宗卫兵
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Tianjin Steel Tube Manufacturing Co., Ltd.
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Tianjin Pipe Group Corp
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Abstract

The invention provides a heat treating method of a high strength and high ductility steel tube, which comprises the steps of: conducting high temperature tempering pretreatment on a hot rolled steel tube, then conducting quenching and tempering heat treatment, and then air cooling to room temperature; heating the steel tube to complete austenitizing temperature after finishing the tempering pretreatment, and conducting water cooling quenching after being insulated and discharged; conducting heat preservation on the quenched steel tube after charged again, and then discharging and cooling to room temperature; and finally achieving following performance after heat treatment: the yield strength, tensile strength, Charpy V-shaped transverse impact strength and longitudinal impact strength at the temperature of 0 DEG C, and other indexes are obviously improved; and the average grain size is 9 to 10 grades. The heat treating method has the beneficial effects that the quality of inside and outside surfaces of the steel tube after the heat pretreatment is better, and the yield of the steel tube is high; the internal, middle and external performance of four quadrant of the steel tube cross section is uniform and stable, the tube straightness is good, and residual stress is low; and compared with the common quenching and tempering heat treatment, the grain size is refined further, and the strength and the toughness are both improved.

Description

A kind of heat treating method of high strength and high ductility steel tube
Technical field
The present invention relates to a kind of heat treating method of weldless steel tube, particularly a kind of heat treating method of high strength and high ductility steel tube.
Background technology
Along with the development of petroleum industry, the following well depth of oil well pipe is more and more darker, and grade of steel intensity is more and more higher.The oil well pipe of being on active service under a lot of complex working condition conditions requires steel pipe that higher intensity, toughness are arranged, and also will have corrosion-resistant preferably, low temperature resistant, anti-squeezing various severe condition such as to ruin, and like this over-all properties of steel pipe is had higher requirement.
Current high strength and high ductility steel tube mainstream development direction, generally adopt following some Technology Control essentials: (surpassing) high purity steel is smelted, and controls low S, P, five evils, gas, inclusion equal size as far as possible; The low-carbon and low-alloy design, strict control alloying constituent accuracy rating; Controlled rolling and controlled chilling are optimized rolling technology, and the tissue and the grain fineness number of attitude steel pipe rolled in refinement; Quenching+tempered quenching-and-tempering process is adopted in thermal treatment, improves quenching, tempering equipment, improves the quench cooled effect, improves tubing tempered structure homogeneity, optimizes thermal treatment process.
For the high-intensity high-tenacity weldless steel tube, generally adopt quenching-and-tempering process, improve the intensity and the toughness of steel pipe.But usually run into such problem in the modifier treatment process, in order to improve the intensity of material, must reduce tempering temperature or shorten tempering insulation time, the toughness of material will descend like this.And if for or better toughness, must improve tempering temperature or prolong tempering time, the intensity of steel will reduce like this.Improve intensity by the quenching solid solution, separate out by tempering and improve toughness, because intensity and flexible contradictory relation, the obdurability that improves quenched and tempered steel mates, and is the main difficult problem that will face in the high strength and high ductility steel tube performance history.
The another one problem that in the heat treatment process of quenched and tempered steel, also will face, be exactly the control of grain fineness number, in order to improve the intensity of steel, the sufficient solid solution of alloying element behind the necessary assurance austenitizing, such approach has two kinds: prolong austenitizing time or improve austenitizing temperature, but this causes growing up of grain fineness number easily.If improve toughness, reduce austenitizing temperature or shorten austenitizing time, but may cause the alloying element solid solution insufficient and reduce the strength of materials in order to obtain tiny crystal grain.In heat treatment process, in order to obtain intensity and toughness preferably, wish promptly to want the sufficient solid solution of alloying element, can not cause crystal grain too to grow up again.So that obtain intensity and toughness preferably later on by follow-up temper.
Summary of the invention
The present invention is the problem that exists in view of in the above-mentioned technology, the object of the present invention is to provide a kind of heat treating method of high strength and high ductility steel tube, be beneficial to one of achieve the goal, make the yield strength of steel pipe reach 1068~1200MPa, tensile strength reaches 1132~1300MPa, two of purpose, and the summer is than 100~150 joules of 0 ℃ of transverse impact merits of V-type, 150~200 joules of impact of collision merits, 9~10 grades of mean grain sizes.
In order to achieve the above object, the technical solution used in the present invention provides a kind of heat treating method of high strength and high ductility steel tube, the chemical constitution of described high strength and high ductility steel tube is in quality %, contain C:0.16%~0.35%, Si:0.10%~0.50%, Mn:0.15%~1.45%, P:0.001%~0.010%, S:0.0001%~0.003%, Ni:0.15%~1.45%, Cr:0.25%~1.50%, Mo:0.15%~1.25%, V:0.01%~0.20%, Nb:0.01%~0.08%, this heat treating method includes following steps:
1. carry out the high tempering pre-treatment before hot rolled steel tube is carried out modified thermal treatment, the pre-treatment holding temperature is 650 ℃~680 ℃, and soaking time is 30~60 minutes, and air cooling was to room temperature after pre-treatment was finished;
2. after tempering pretreatment is finished, steel pipe is heated to more than the complete austenitizing temperature Ac3 15 ℃~30 ℃, the austenitizing soaking time is 15~30 minutes, the back cold quenching of coming out of the stove;
3. the steel pipe after quenching reenters the tempering stove insulation and handles, and tempering temperature is 560 ℃~650 ℃, and soaking time is 45~90 minutes, and the air cooling of coming out of the stove then is to room temperature;
4. through heat treatment step 3. after final steel pipe reach performance: yield strength 1068~1200MPa, tensile strength 1132~1300MPa; Summer is than 100~150 joules of 0 ℃ of transverse impact merits of V-type, 150~200 joules of impact of collision merits; 9~10 grades of mean grain sizes.
Effect of the present invention is good through the final steel pipe surfaces externally and internally quality after this thermal treatment, steel pipe lumber recovery height; China and foreign countries' performance is uniform and stable in the four-quadrant of steel pipe cross section, and steel pipe integral is directly spent better, and unrelieved stress is low; With common tempering heat treatment phase ratio, grain fineness number is refinement more, and intensity and toughness all are improved.
Embodiment
Below, in conjunction with the embodiments heat treating method of high strength and high ductility steel tube of the present invention is described in detail.
Heat treating method of high strength and high ductility steel tube of the present invention, this method includes following steps:
1. the high tempering pre-treatment before hot rolled steel tube is carried out modified thermal treatment, the pre-treatment holding temperature is 650 ℃~680 ℃, and soaking time is 30~60 minutes, and air cooling was to room temperature after pre-treatment was finished;
2. after tempering pretreatment is finished steel pipe is heated to more than the complete austenitizing temperature Ac3 15 ℃~30 ℃, the austenitizing soaking time is 15~30 minutes, the back cold quenching of coming out of the stove.
3. the steel pipe after quenching reenters the tempering stove insulation and handles, and tempering temperature is 560 ℃~650 ℃, and soaking time is 45~90 minutes, and the air cooling of coming out of the stove then is to room temperature.
4. after heat treatment final steel pipe reaches performance: yield strength 1068~1200MPa, tensile strength 1132~1300MPa; Summer is than 100~150 joules of 0 ℃ of transverse impact merits of V-type, 150~200 joules of impact of collision merits; 9~10 grades of mean grain sizes.
Chemical constitution contains C:0.16%~0.35%, Si:0.10%~0.50%, Mn:0.15%~1.45%, P:0.001%~0.010 in quality % in the high strength and high ductility steel tube of the present invention
Table 2 adopts conventional heat treated steel tube performance result
Contrast table 1 and table 2 are as can be seen, adopt after the thermal treatment of the present invention, the more conventional thermal treatment of yield strength has improved 50MPa, the transverse impact merit has improved 33J, the impact of collision merit has improved 60J, and grain fineness number is brought up to 9.5 grades from 8.0 grades, grain fineness number obtains obvious refinement, and this also is the major cause that later intensity of process thermal treatment of the present invention and toughness all improve.

Claims (1)

1. heat treating method of high strength and high ductility steel tube, the chemical constitution of described high strength and high ductility steel tube is in quality %, contain C:0.16%~0.35%, Si:0.10%~0.50%, Mn:0.15%~1.45%, P:0.001%~0.010%, S:0.0001%~0.003%, Ni:0.15%~1.45%, Cr:0.25%~1.50%, Mo:0.15%~1.25%, V:0.01%~0.20%, Nb:0.01%~0.08%, this heat treating method includes following steps:
1. carry out the high tempering pre-treatment before hot rolled steel tube is carried out modified thermal treatment, the pre-treatment holding temperature is 650 ℃~680 ℃, and soaking time is 30~60 minutes, and air cooling was to room temperature after pre-treatment was finished;
2. after tempering pretreatment is finished, steel pipe is heated to more than the complete austenitizing temperature Ac3 15 ℃~30 ℃, the austenitizing soaking time is 15~30 minutes, the back cold quenching of coming out of the stove;
3. the steel pipe after quenching reenters the tempering stove insulation and handles, and tempering temperature is 560 ℃~650 ℃, and soaking time is 45~90 minutes, and the air cooling of coming out of the stove then is to room temperature;
4. through heat treatment step 3. after final steel pipe reach performance: yield strength 1068~1200MPa, tensile strength 1132~1300MPa; Summer is than 100~150 joules of 0 ℃ of transverse impact merits of V-type, 150~200 joules of impact of collision merits; 9~10 grades of mean grain sizes.
CN200910070448XA 2009-09-16 2009-09-16 Heat treating method of high strength and high ductility steel tube Active CN101660036B (en)

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103194697A (en) * 2013-04-12 2013-07-10 内蒙古包钢钢联股份有限公司 Special H2S corrosion-resistant sleeve for heavy oil thermal recovery well, and production method
CN103898283B (en) * 2014-03-25 2016-06-15 宁夏共享集团有限责任公司 A kind of tempering heat treatment process of high strength steel
CN108118251B (en) * 2016-11-30 2020-09-25 宝山钢铁股份有限公司 High-strength high-toughness perforating gun barrel and manufacturing method thereof
ES2922300T3 (en) * 2018-02-23 2022-09-13 Vallourec Deutschland Gmbh High strength and high toughness steels
CN110819901B (en) * 2019-12-05 2021-09-24 马鞍山钢铁股份有限公司 High-strength brake disc bolt steel and heat treatment process thereof
CN114277306A (en) * 2020-09-27 2022-04-05 宝山钢铁股份有限公司 High-strength steel for 1000 MPa-level engineering machinery and production method thereof
CN112143858A (en) * 2020-09-30 2020-12-29 江苏联峰能源装备有限公司 Efficient heat treatment process for continuous casting round blank
CN113549817A (en) * 2021-06-28 2021-10-26 鞍钢股份有限公司 770 MPa-level low-alloy high-strength high-toughness seamless steel pipe and manufacturing method thereof

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Effective date of registration: 20190620

Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301

Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd.

Address before: 300301 Jintang Road, Dongli District, Tianjin

Patentee before: Tianjin Steel Pipe Group Co., Ltd.