CN103468904A - Control method of network carbide of GCr15 bearing steel wire rod - Google Patents

Control method of network carbide of GCr15 bearing steel wire rod Download PDF

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Publication number
CN103468904A
CN103468904A CN2013104015567A CN201310401556A CN103468904A CN 103468904 A CN103468904 A CN 103468904A CN 2013104015567 A CN2013104015567 A CN 2013104015567A CN 201310401556 A CN201310401556 A CN 201310401556A CN 103468904 A CN103468904 A CN 103468904A
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China
Prior art keywords
wire rod
temperature
bearing steel
cooling
steel wire
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CN2013104015567A
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CN103468904B (en
Inventor
郭大勇
任玉辉
王秉喜
高航
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The invention provides a control method of network carbide of a GCr15 bearing steel wire rod. A soaking temperature of a continuous rolling billet is 1200-1250 DEG C, the total time in a furnace is 10-14 h, and a final rolling temperature is not less than 950 DEG C; the billet is rolled to a wire rod after being heated, a spinning temperature of the wire rod is controlled to 880-930 DEG C, a water cooling speed is 15-40 DEG C/s, a water cooling time is 10-50 s, and a coiling temperature is controlled to 200-400 DEG C. After the control method provided by the invention is applied in production, the tissue grade of the network carbide of the GCr15 bearing steel wire rod can be decreased from not more than 2.0 grades to 0.6 grades, thereby improving the processing performance of the bearing steel wire rod and facilitating the prolonging of the fatigue service life of the bearing.

Description

A kind of GCr15 bearing steel wire rod carbide network control method
Technical field
The invention belongs to the metallurgical technology technical field, relate in particular to a kind of GCr15 bearing steel wire rod carbide network control method.
Background technology
The Bearing with high properties steel wire rod need to have good military service fatigue lifetime, and this just requires to eliminate the carbide network in the wire rod tissue as far as possible, or makes the carbide network in the wire rod tissue as far as possible slight.Carbide network comparatively serious in the wire rod tissue is difficult for eliminating in bearing steel wire rod Spheroidizing Annealing process, after making bearing, in bearing military service process, is easy to form at first crackle at the carbide network place, thus the fatigue lifetime of reducing bearing.
The patent of invention content that Wuhan Iron & Steel (Group) Corp. is entitled as " method that reduces net level of bearing steel wire rod carbide " is: at first the bearing steel continuous casting steel billet is carried out to heat temperature raising, at the temperature of 1030~1130 ℃, carry out roughing, in roll and pre-finish rolling is processed, make the accumulative total unit elongation n1=65 of rolled piece~120 times; Secondly rolled piece is carried out to pre-water-cooled processing, speed of cooling is controlled at 10~40 ℃/s, is controlled at 0.8~2.2s cooling time; Then rolled piece is carried out to 4~10 passage finish rolling and process, start rolling temperature is controlled at 900~950 ℃, and finishing temperature is controlled at 920~990 ℃; Again rolled piece is carried out to the water-cooled processing, speed of cooling is controlled at 50~350 ℃/s, and laying temperature is controlled at 760~820 ℃, makes loose volume; Finally to faling apart, involve in the sector-style deepfreeze, air-cooled speed control is at 2~10 ℃/s, and the loose collection volume temperature that rolls out air-cooled roller-way is controlled at 330~450 ℃, is placed in ambient air and is cooled to normal temperature.Adopt product that present method is produced that 95% carbide network rank≤1.0 grades is arranged, 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 that carbide network is separated out, and low temperature is weaved silk and strengthened the loss of finishing mill or Dual module and spinneret, is unfavorable for reducing production costs.
Summary of the invention
The invention provides a kind of GCr15 bearing steel wire rod carbide network control method, its purpose is to control wire rod carbide network tissue grading and reaches and be not more than 1.0 grades, thereby improves 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, adopt 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 the tandem rolling operation, further reduce the segregation of tandem rolling base; At the wire rod rolling process, change traditional air-cooled technique, adopt water-cooling process to accelerate the wire rod speed of cooling.Its concrete control method is:
1, tandem rolling: tandem rolling operation steel billet soaking temperature is at 1200-1250 ℃, total time inside furnace is by the 3-5 hour of ordinary process, extend to 10-14 hour, reach the purpose that the steel billet High temperature diffusion reduces element segregation, for the final carbide network that reduces wire rod organizes rank to create conditions.Tandem rolling operation billet heating temperature is lower than 1200 ℃, and the time is less than 10 hours, and steel billet High temperature diffusion weak effect does not reach the purpose that reduces the steel billet element segregation; Billet heating temperature is higher than 1250 ℃, and the time is longer than 14 hours, there will be the steel billet burn-off phenomenon, causes the billet quality severe exacerbation.Tandem rolling operation rolled piece finishing temperature is not less than 950 ℃, prevents that rolling crack from appearring in tandem rolling base surface.
2, rod rolling: steel billet is rolled into wire rod in wire rolling plants after heating.The wire rod laying temperature is controlled at 880-930 ℃.The wire rod laying temperature is too low, and the finishing mill load is heavy, and roll wear is serious, and is unfavorable for the production direct motion; The wire rod laying temperature is too high, and it organizes grain fineness number thick, is unfavorable for improving the wire rod mechanical property; The too high wire rod ferric oxide skin depth that also can cause of laying temperature, reduce user's recovery rate of iron.Wire rod is weaved silk in the rear hot water that enters fast boiling and is carried out coolingly, prevents that wire rod from directly entering in cold water cooling fast, martensitic stucture occurs.Wire rod cooling by water speed control is at 15-40 ℃/s, and the cooling by water time is controlled at 10-50s.Too low speed of cooling and do not reach shorter cooling time and suppress the purpose that the wire rod carbide network is separated out.Too high speed of cooling and longer cooling time, can cause wire rod the over-cooling structures such as martensite to occur, is unfavorable for the following process of wire rod.The cooling rear continuation of wire rod is cooling on air-cooled roller-way, and wire rod collection volume temperature is controlled at 200-400 ℃.
Beneficial effect of the present invention is:
Control method of the present invention, can make aborning the grading of GCr15 bearing steel wire rod carbide network tissue be reduced to 0.6 grade by being not more than 2.0 grades, thereby improve the processing characteristics of bearing steel wire rod after the application, be conducive to extend the fatigue lifetime of bearing.
Embodiment
GCr15 bearing steel wire rod carbide network control method of the present invention, the 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 the induction stirring effect; Adopt high temperature diffusion annealing technique in the tandem rolling operation, further reduce the segregation of tandem rolling base; At the wire rod rolling process, change traditional air-cooled technique, adopt water-cooling process to accelerate the wire rod speed of cooling.
Embodiment and Comparative Examples processing parameter and carbide network are controlled effect and are seen the following form:
Embodiment, Comparative Examples processing parameter and carbide network are controlled effect

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 1200-1250 ℃, total time inside furnace 10-14h; The tandem rolling finishing temperature is not less than 950 ℃;
(2) rod rolling: be rolled into wire rod after heating steel billet, the wire rod laying temperature is controlled at 880-930 ℃; Wire rod cooling by water speed control is at 15-40 ℃/s, cooling by water time 10-50s; The cooling rear continuation of wire rod is cooling on air-cooled roller-way, and wire rod collection volume temperature is controlled at 200-400 ℃.
CN201310401556.7A 2013-09-06 2013-09-06 Control method of network carbide of GCr15 bearing steel wire rod Active CN103468904B (en)

Priority Applications (1)

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CN201310401556.7A CN103468904B (en) 2013-09-06 2013-09-06 Control method of network carbide of GCr15 bearing steel wire rod

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Application Number Priority Date Filing Date Title
CN201310401556.7A CN103468904B (en) 2013-09-06 2013-09-06 Control method of network carbide of GCr15 bearing steel wire rod

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CN103468904B CN103468904B (en) 2015-07-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109402356A (en) * 2018-11-09 2019-03-01 江阴兴澄合金材料有限公司 The controlled rolling and cooling method of bearing steel wire rod carbide network control
CN111850400A (en) * 2020-07-07 2020-10-30 鞍钢股份有限公司 Control method of net-shaped cementite of steel wire rod for ultrahigh carbon cold drawing
WO2021057218A1 (en) * 2019-09-27 2021-04-01 南京钢铁股份有限公司 Continuously cast gcr15 bearing steel wire rod carbide network control method

Citations (1)

* Cited by examiner, † Cited by third party
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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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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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109402356A (en) * 2018-11-09 2019-03-01 江阴兴澄合金材料有限公司 The controlled rolling and cooling method of bearing steel wire rod carbide network control
WO2020094106A1 (en) * 2018-11-09 2020-05-14 江阴兴澄合金材料有限公司 Controlled cooling and controlled rolling method for control over bearing steel wire carbide network
WO2021057218A1 (en) * 2019-09-27 2021-04-01 南京钢铁股份有限公司 Continuously cast gcr15 bearing steel wire rod carbide network control method
CN111850400A (en) * 2020-07-07 2020-10-30 鞍钢股份有限公司 Control method of net-shaped cementite of steel wire rod for ultrahigh carbon cold drawing

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