CN101660036A - 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 PDFInfo
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- CN101660036A CN101660036A CN200910070448A CN200910070448A CN101660036A CN 101660036 A CN101660036 A CN 101660036A CN 200910070448 A CN200910070448 A CN 200910070448A CN 200910070448 A CN200910070448 A CN 200910070448A CN 101660036 A CN101660036 A CN 101660036A
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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 crosssection 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
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, and this 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%, 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% in quality % in the high strength and high ductility steel tube of the present invention.
In the described steel pipe chemical constitution,, can also contain and be selected from W:0.01%～0.85%, B:0.001%～0.005%, Ti:0.001%～0.08%, Al:0.005%～0.06% in quality %.
In the described steel pipe chemical constitution, also contain 0:0.0001%～0.004%, N:0.001%～0.012%, H:0.0001%～0.005% in quality %.
In the described steel pipe chemical constitution, can also contain Ca:0.0005%～0.0050% in quality %.
Through Electric furnace steel making, refining, vacuum outgas, continuous casting, the strand heating, perforation, tandem rolling, sizing after the cooling, gets hot rolled steel tube.
Adopt heat treating method of the present invention that hot rolled steel tube is heat-treated:
1, elder generation carries out a high tempering pre-treatment with the steel pipe of hot rolling attitude, 675 ℃ of pre-treatment holding temperatures, and soaking time 45 minutes, air cooling was to room temperature after pre-treatment was finished.
2, pretreated steel pipe is heated to 870 ℃ of austenitizings, and 855 ℃ of the AC3 temperature through recording this ferrous materials so choose 870 ℃ of austenitizings, are incubated 20 minutes then, the back cold quenching of coming out of the stove.
3, the steel pipe after the quenching reenters tempering stove insulation processing, and 620 ℃ of tempering temperatures are incubated 60 minutes, and the air cooling of coming out of the stove then is to room temperature.
Steel pipe through after the above-mentioned thermal treatment detects its performance and reaches as shown in table 1 below.
If same hot rolled steel tube is adopted conventional modified thermal treatment, steel pipe is heated to 900 ℃ of austenitizings, is incubated 30 minutes, the back shrend of coming out of the stove.Steel pipe after the quenching reenters tempering stove, and 620 ℃ of tempering temperatures are incubated 60 minutes, the air cooling of coming out of the stove then, and its performance is as shown in table 2.
Table 1 is through the heat treated steel tube performance result of the present invention
| Yield strength (MPa) | Tensile strength (MPa) | Hardness (HRC) | Transverse impact merit (J) (summer than V, 0 ℃) | Impact of collision merit (J) (summer than V, 0 ℃) | Metallographic structure | Grain fineness number |
| ??1124 | ??1208 | ??39.4 | ??118 | ??168 | Tempered sorbite | 9.5 level |
Table 2 adopts conventional heat treated steel tube performance result
| Yield strength (MPa) | Tensile strength (MPa) | Hardness (HRC) | Transverse impact merit (J) (summer than V, 0 ℃) | Impact of collision merit (J) (summer than V, 0 ℃) | Metallographic structure | Grain fineness number |
| ??1074 | ??1153 | ??38.4 | ??85 | ??108 | Tempered sorbite | 8.0 level |
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, a kind of heat treating method of high strength and high ductility steel tube, this 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.
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| CN200910070448XA CN101660036B (en) | 2009-09-16 | 2009-09-16 | Heat treating method of high strength and high ductility steel tube |
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| CN200910070448XA CN101660036B (en) | 2009-09-16 | 2009-09-16 | Heat treating method of high strength and high ductility steel tube |
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| CN101660036A true CN101660036A (en) | 2010-03-03 |
| CN101660036B CN101660036B (en) | 2011-01-19 |
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Cited By (9)
| 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 |
| CN103898283A (en) * | 2014-03-25 | 2014-07-02 | 宁夏共享集团有限责任公司 | Tempering heat treatment process of high-strength steel |
| CN110819901A (en) * | 2019-12-05 | 2020-02-21 | 马鞍山钢铁股份有限公司 | High-strength brake disc bolt steel and heat treatment process thereof |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| 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 |
| 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 |
| CN114657332A (en) * | 2022-03-17 | 2022-06-24 | 湖南华菱涟源钢铁有限公司 | Quenched and tempered steel plate material and manufacturing method thereof |
| US11459643B2 (en) * | 2016-11-30 | 2022-10-04 | Baoshan Iron & Steel Co., Ltd. | High-strength and high-toughness perforating gun tube and manufacturing method therefor |
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2009
- 2009-09-16 CN CN200910070448XA patent/CN101660036B/en active Active
Cited By (11)
| 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 |
| CN103898283A (en) * | 2014-03-25 | 2014-07-02 | 宁夏共享集团有限责任公司 | Tempering heat treatment process of high-strength steel |
| 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 |
| US11459643B2 (en) * | 2016-11-30 | 2022-10-04 | Baoshan Iron & Steel Co., Ltd. | High-strength and high-toughness perforating gun tube and manufacturing method therefor |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| CN110819901A (en) * | 2019-12-05 | 2020-02-21 | 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 |
| CN114657332A (en) * | 2022-03-17 | 2022-06-24 | 湖南华菱涟源钢铁有限公司 | Quenched and tempered steel plate material and manufacturing method thereof |
| CN114657332B (en) * | 2022-03-17 | 2024-03-29 | 湖南华菱涟源钢铁有限公司 | Quenched and tempered steel plate material and method for producing same |
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| CN101660036B (en) | 2011-01-19 |
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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. |
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