CN103468904B - GCr15 bearing steel wire rod net carbide control method - Google Patents
GCr15 bearing steel wire rod net carbide control method Download PDFInfo
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- CN103468904B CN103468904B CN201310401556.7A CN201310401556A CN103468904B CN 103468904 B CN103468904 B CN 103468904B CN 201310401556 A CN201310401556 A CN 201310401556A CN 103468904 B CN103468904 B CN 103468904B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000009987 spinning Methods 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 7
- 238000005204 segregation Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a control method of net carbide of GCr15 bearing steel wire rods, wherein the soaking temperature of continuous rolling steel billets is 1200-1250 ℃, the total in-furnace time is 10-14h, and the final rolling temperature is more than or equal to 950 ℃; the steel billet is rolled into a wire rod after being heated, the spinning temperature of the wire rod is controlled at 880-930 ℃, the water cooling speed is 15-40 ℃/s, the water cooling time is 10-50s, and the coiling temperature is controlled at 200-400 ℃. After the control method is applied in production, the net carbide structure grade of the GCr15 bearing steel wire rod can be reduced from not more than 2.0 grade to 0.6 grade, so that the processing performance of the bearing steel wire rod is improved, and the fatigue life of the bearing is prolonged.
Description
Technical field
The invention belongs to metallurgical technology technical field, particularly relate to a kind of GCr15 bearing steel wire rod carbide network control method.
Background technology
Bearing with high properties steel wire rod needs good military service fatigue lifetime, and this just requires the carbide network as far as possible eliminated in wire rod tissue, or makes the carbide network in wire rod tissue as far as possible slight.Carbide network comparatively serious in wire rod tissue is not easily eliminated in bearing steel wire rod Spheroidizing Annealing process, after making bearing, in bearing military service process, is easy to form crackle at first at carbide network place, thus reduces the fatigue lifetime of bearing.
The patent of invention content that Wuhan Iron & Steel (Group) Corp. is entitled as " reducing the method for net level of bearing steel wire rod carbide " is: first carry out heat temperature raising to bearing steel continuous casting steel billet, carry out at the temperature of 1030 ~ 1130 DEG C roughing, in roll and pre-finish rolling process, make accumulative unit elongation n1=65 ~ 120 times of rolled piece; Secondly carry out pre-water-cooled process to rolled piece, speed of cooling controls, at 10 ~ 40 DEG C/s, to control cooling time at 0.8 ~ 2.2s; Then carry out 4 ~ 10 passage finish rolling process to rolled piece, start rolling temperature controls at 900 ~ 950 DEG C, and finishing temperature control is at 920 ~ 990 DEG C; Carry out water-cooled process to rolled piece again, speed of cooling controls at 50 ~ 350 DEG C/s, and laying temperature controls at 760 ~ 820 DEG C, makes loose volume; Finally involve in sector-style deepfreeze to loose, air-cooled speed control is at 2 ~ 10 DEG C/s, and the loose collection volume temperature rolling out air-cooled roller-way controls, at 330 ~ 450 DEG C, to be placed in ambient air and to be cooled to normal temperature.The product adopting present method to produce has carbide network rank≤1.0 grade of 95%, and average rank is 0.95 grade, can increase wear resistance and the work-ing life of steel.
Above-mentioned bearing steel employing low temperature is weaved silk and is suppressed the method for carbide network precipitation, and low temperature is weaved silk and increased the loss of finishing mill or Dual module and spinneret, is unfavorable for reducing production cost.
Summary of the invention
The invention provides a kind of GCr15 bearing steel wire rod carbide network control method, its object is to control wire rod carbide network and organize grading to reach to be not more than 1.0 grades, thus improve the processing characteristics of bearing steel wire rod.
For this reason, the solution that the present invention takes is:
A kind of GCr15 bearing steel wire rod carbide network control method, adopts bloom continuous casting in conjunction with induction stirring at continuous casting working procedure, alleviates continuous casting slab segregation; Adopt high temperature diffusion annealing technique in tandem rolling operation, reduce Concasting Bloom segregation further; At wire rod rolling process, change traditional air-cooled technique, adopt water-cooling process to accelerate wire rod speed of cooling.Its concrete control method is:
1, tandem rolling: tandem rolling operation steel billet soaking temperature is at 1200-1250 DEG C, total time inside furnace is by the 3-5 hour of ordinary process, extend to 10-14 hour, reach the object that steel billet High temperature diffusion reduces element segregation, for the carbide network finally reducing wire rod organizes rank to create conditions.Tandem rolling operation billet heating temperature is lower than 1200 DEG C, and the time is less than 10 hours, steel billet High temperature diffusion weak effect, does not reach the object reducing steel billet element segregation; Billet heating temperature is higher than 1250 DEG C, and the time is longer than 14 hours, there will be steel billet burn-off phenomenon, causes billet quality severe exacerbation.Tandem rolling operation rolled piece finishing temperature is not less than 950 DEG C, prevents Concasting Bloom surface from occurring rolling crack.
2, rod rolling: steel billet is rolled into wire rod in wire rolling plants after heating.Wire rod laying temperature controls at 880-930 DEG C.Wire rod laying temperature is too low, finishing mill load weight, and roll wear is serious, and is unfavorable for production direct motion; Wire rod laying temperature is too high, and it organizes grain fineness number thick, is unfavorable for improving wire rod mechanical property; Laying temperature is too high also can cause wire rod ferric oxide skin depth, reduces the recovery rate of iron of user.Wire rod enters fast after weaving silk in the hot water of boiling and cools, and prevents wire rod from directly entering in cold water and cools fast, occur martensitic stucture.Wire rod cooling by water speed control is at 15-40 DEG C/s, and cooling by water time controling is at 10-50s.Do not reach too low speed of cooling and shorter cooling time the object suppressing wire rod carbide network to be separated out.Too high speed of cooling and longer cooling time, wire rod can be caused to occur the over-cooling structures such as martensite, be unfavorable for the following process of wire rod.Continue to cool on air-cooled roller-way after wire rod cooling, wire rod collection volume temperature controls at 200-400 DEG C.
Beneficial effect of the present invention is:
Control method of the present invention, can make GCr15 bearing steel wire rod carbide network tissue grade aborning and be reduced to 0.6 grade by being not more than 2.0 grades, thus improve the processing characteristics of bearing steel wire rod, be conducive to the fatigue lifetime extending bearing after application.
Embodiment
GCr15 bearing steel wire rod carbide network control method of the present invention, continuous casting blooms cross dimensions is 280 × 380mm, adopt crystallizer end and solidification end induction stirring at continuous casting working procedure, alleviate continuous casting slab segregation, utilize larger strength of current and low stirring frequency to improve induction stirring effect; Adopt high temperature diffusion annealing technique in tandem rolling operation, reduce Concasting Bloom segregation further; At wire rod rolling process, change traditional air-cooled technique, adopt water-cooling process to accelerate wire rod speed of cooling.
Embodiment and comparative example processing parameter and carbide network control effects see the following form:
Embodiment, comparative example processing parameter and carbide network control effects
Claims (1)
1. a GCr15 bearing steel wire rod carbide network control method, is characterized in that, concrete grammar is:
(1) tandem rolling: steel billet soaking temperature 1240-1250 DEG C, total time inside furnace 12-13h; Tandem rolling finishing temperature is not less than 950 DEG C;
(2) rod rolling: be rolled into wire rod after heating steel billet, wire rod laying temperature controls at 880-930 DEG C; Wire rod cooling by water speed control at 15-40 DEG C/s, cooling by water time 10-50s; Continue to cool on air-cooled roller-way after wire rod cooling, wire rod collection volume temperature controls at 200-400 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310401556.7A CN103468904B (en) | 2013-09-06 | 2013-09-06 | GCr15 bearing steel wire rod net carbide control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310401556.7A CN103468904B (en) | 2013-09-06 | 2013-09-06 | GCr15 bearing steel wire rod net carbide control method |
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| CN103468904A CN103468904A (en) | 2013-12-25 |
| CN103468904B true CN103468904B (en) | 2015-07-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643798A (en) * | 2019-09-27 | 2020-01-03 | 南京钢铁股份有限公司 | Net control method for carbide of continuous casting GCr15 bearing steel wire rod |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109402356B (en) * | 2018-11-09 | 2020-02-07 | 江阴兴澄合金材料有限公司 | Controlled cooling and controlled rolling method for controlling net shape of bearing steel wire carbide |
| CN111850400B (en) * | 2020-07-07 | 2022-07-22 | 鞍钢股份有限公司 | Control method for net-shaped cementite of steel wire rod for ultrahigh carbon cold drawing |
| CN113699440A (en) * | 2021-07-27 | 2021-11-26 | 马鞍山钢铁股份有限公司 | Production process method for reducing net grade of GCr15 bearing steel bar carbide |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716648A (en) * | 2009-12-04 | 2010-06-02 | 大连交通大学 | Bearing part post-forging intelligent cooling control technical process and device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716648A (en) * | 2009-12-04 | 2010-06-02 | 大连交通大学 | Bearing part post-forging intelligent cooling control technical process and device |
Non-Patent Citations (4)
| Title |
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| 张务林.轴承钢棒线材生产技术的研究与应用.《特钢技术》.1997,(第3期),第7-10页. * |
| 李孝池.Ф5.5规格GCr15线材实现冷拉拔的工艺探索.《南钢科技与管理》.2007,(第4期),第1-6页. * |
| 轴承钢热轧组织控制机理与超快速冷却研究;孙艳坤;《中国博士学位论文全文数据库 工程科技Ⅰ辑》;20120615(第6期);第9页第4段 * |
| 高标准轴承钢线材碳化物的控制;梁治国等;《南钢科技与管理》;20120930(第3期);第14页左栏最后一段,表2及第16页左栏第4-8、15-17行 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643798A (en) * | 2019-09-27 | 2020-01-03 | 南京钢铁股份有限公司 | Net control method for carbide of continuous casting GCr15 bearing steel wire rod |
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