CN103695623A - Treatment method of special thick-walled seamless tube - Google Patents
Treatment method of special thick-walled seamless tube Download PDFInfo
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- CN103695623A CN103695623A CN201310703920.5A CN201310703920A CN103695623A CN 103695623 A CN103695623 A CN 103695623A CN 201310703920 A CN201310703920 A CN 201310703920A CN 103695623 A CN103695623 A CN 103695623A
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Abstract
The invention provides a treatment method of a special thick-walled seamless tube. The method comprises the following steps: quenching the 37Mn5-type special thick-walled seamless tube with 121*27mm in the steel grade ZT590 after being hardened and tempered, in a quenching furnace in a furnace assembling mode of one tube per two tooth under the conditions that the upper limit heating temperature ranges from 910 DEG C to 920 DEG C and the heating time for quenching ranges from 87 to 92 minutes; performing water quenching for 58 to 63 seconds in a mode of external sprinkling and internal spraying under the conditions that the diameter of an internal spray nozzle ranges from 43mm to 46mm, the distance of the end surface of the spray nozzle to the end of the tube ranges from 55mm to 65mm, the flow of the external sprinkling water is greater than or equal to 2500m<3>/h and the flow of the internal spraying water is greater than or equal to 720m<3>/h; tempering under the conditions that the heating temperature controlled within 540+/-10 DEG C and the heating time is controlled within 145 to 155 minutes. According to the method, the good hardening effect can be realized under the condition that hardenability elements are not added, namely, the seamless steel tube, the geometric dimension, the texture and the performance of which completely meet the standard requirement, can be obtained; the phenomenon of secondary heat treatment caused by the performance instability is avoided. Thus, the human resource and the material resource are greatly saved; the production cost is lowered.
Description
Technical field
The invention belongs to steel rolling process technical field, relate in particular to a kind of heat-treatment technology method for special thick-walled seamless steel pipes.
Background technology
So-called special thick-wall seamless refers to external diameter: the weldless steel tube of thickness of pipe≤10.At present, domestic and international special thick-walled seamless steel pipes thermal treatment generally takes to increase the method for hardening capacity element, reaches the object of through hardening.But, add hardening capacity element potential and must increase heat treated cost, and there is unstable properties phenomenon in the seamless tube after very easily making to process, cause second heat treatment, significant wastage human and material resources and financial resources.
Summary of the invention
The present invention aims to provide a kind of thermal treatment cost that reduces, and guarantees the heat treating method of the special thick-wall seamless of heat treatment performance.
For this reason, the solution that the present invention takes is:
A kind of heat treating method of special thick-wall seamless, it is characterized in that, material is that 37Mn5, modified rear grade of steel are that ZT590, external diameter and wall thickness are that the machining process route of the special thick-wall seamless of 121 * 27mm is: quench heating and insulation-shrend-tempering heating and insulation-cooling-align.
When 1, quenching furnance heats, take upper limit Heating temperature and insulation for a long time, upper limit Heating temperature is 910～920 ℃, 87～92min heat-up time that quenches, and charging mode is taked 1/2 teeth.
2, shrend adopts the mode of outer pouring+interior spray, inner nozzle diameter 43～46mm, nozzle face quarter bend end 55～65mm, outer trickle flow>=2500m
3/ h, interior spray flow>=720m
3/ h, shrend time 58～63s.
3, tempering heating and temperature control is at 540 ± 10 ℃, tempering 145～155min heat-up time.
Beneficial effect of the present invention is:
The present invention can make special thick-wall seamless in the situation that not adding hardening capacity element, realize good through hardening effect, acquisition geometrical dimension, Microstructure and properties meet the weldless steel tube of standard-required completely, thereby effectively avoid the second heat treatment phenomenon causing due to unstable properties, greatly save man power and material, reduce production costs.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment seamless tube material is that 37Mn5, modified rear grade of steel are that ZT590, specification are the special thick-wall seamless of 121 * 27mm, and its machining process route is: quench heating and insulation-shrend-tempering heating and insulation-cooling-aligning.
Embodiment 1:
When 1, quenching furnance heats, take upper limit Heating temperature and insulation for a long time, make body heating fully, its upper limit Heating temperature is 910 ℃, 88min heat-up time that quenches, and charging mode is taked 1/2 teeth.
2, shrend adopts the mode of outer pouring+interior spray, and uses special-purpose inner nozzle, by controlling discharge, guarantees through hardening effect.Its inner nozzle diameter 45mm, nozzle face quarter bend end 60mm, outer trickle flow 2600m
3/ h, interior spray flow 750m
3/ h, shrend time 59s.
3, tempering heating and temperature control is at 535 ℃, tempering 155min heat-up time.
Embodiment 2:
When 1, quenching furnance heats, take upper limit Heating temperature and insulation for a long time, make body heating fully, its upper limit Heating temperature is 920 ℃, 90min heat-up time that quenches, and charging mode is taked 1/2 teeth.
2, shrend adopts the mode of outer pouring+interior spray, and uses special-purpose inner nozzle, by controlling discharge, guarantees through hardening effect.Its inner nozzle diameter 43mm, nozzle face quarter bend end 56mm, outer trickle flow 2500m
3/ h, interior spray flow 720m
3/ h, shrend time 60s.
3, tempering heating and temperature control is at 550 ℃, tempering 147min heat-up time.
Claims (1)
1. the heat treating method of a special thick-wall seamless, it is characterized in that, material is that the machining process route of 37Mn5, the modified rear grade of steel special thick-wall seamless of 121 * 27mm that is ZT590 is: quench heating and insulation-shrend-tempering heating and insulation-cooling-align;
(1), quenching furnance when heating take upper limit Heating temperature and insulation for a long time, upper limit Heating temperature is 910～920 ℃, 87～92min heat-up time that quenches, charging mode is taked 1/2 teeth;
(2), shrend adopts the mode of outer pouring+interior spray, inner nozzle diameter 43～46mm, nozzle face quarter bend end 55～65mm, outer trickle flow>=2500m
3/ h, interior spray flow>=720m
3/ h, shrend time 58～63s;
(3), tempering heating and temperature control is at 540 ± 10 ℃, tempering 145～155min heat-up time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310703920.5A CN103695623A (en) | 2013-12-20 | 2013-12-20 | Treatment method of special thick-walled seamless tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310703920.5A CN103695623A (en) | 2013-12-20 | 2013-12-20 | Treatment method of special thick-walled seamless tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103695623A true CN103695623A (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310703920.5A Pending CN103695623A (en) | 2013-12-20 | 2013-12-20 | Treatment method of special thick-walled seamless tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014855A (en) * | 2017-05-23 | 2017-08-04 | 中国石油天然气集团公司 | A kind of tubing heat treatment experiment device |
| CN113441910A (en) * | 2021-06-17 | 2021-09-28 | 大冶特殊钢有限公司 | Ultra-thick-wall quality-adjusting pipe and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343715A (en) * | 2008-09-03 | 2009-01-14 | 天津钢管集团股份有限公司 | High-strength high-ductility X70 thick-wall seamless pipeline steel and manufacturing method |
| CN102586568A (en) * | 2012-03-22 | 2012-07-18 | 内蒙古包钢钢联股份有限公司 | Intermediate frequency induction heat-treatment process for seamless steel pipe |
-
2013
- 2013-12-20 CN CN201310703920.5A patent/CN103695623A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343715A (en) * | 2008-09-03 | 2009-01-14 | 天津钢管集团股份有限公司 | High-strength high-ductility X70 thick-wall seamless pipeline steel and manufacturing method |
| CN102586568A (en) * | 2012-03-22 | 2012-07-18 | 内蒙古包钢钢联股份有限公司 | Intermediate frequency induction heat-treatment process for seamless steel pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014855A (en) * | 2017-05-23 | 2017-08-04 | 中国石油天然气集团公司 | A kind of tubing heat treatment experiment device |
| CN113441910A (en) * | 2021-06-17 | 2021-09-28 | 大冶特殊钢有限公司 | Ultra-thick-wall quality-adjusting pipe and preparation method thereof |
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Application publication date: 20140402 |