Bearing steel wire rod and production method thereof

A production method and bearing steel technology, applied in the field of iron and steel material production, can solve the problems of inability to mass production, difficult to achieve technology, harsh conditions, etc., and achieve the effect of avoiding abnormal structure and shortening spheroidizing annealing time.

Active Publication Date: 2016-09-07
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method requires harsh conditions, and the current wire rolling te

Method used

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  • Bearing steel wire rod and production method thereof
  • Bearing steel wire rod and production method thereof
  • Bearing steel wire rod and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Smelting molten steel and continuous casting into billets, the weight percentages of steel components are: C 0.95%, Si 0.28%, Mn 0.31%, Cr 1.60%, P 0.025%, S 0.018%, Mo 0.08%, Ni 0.13%, Cu 0.20% , O 0.0011%, the balance is Fe and trace impurities.

[0040] The molten steel is refined in a RH furnace, the vacuum degree is 91Pa, and the vacuum cycle treatment time is 46 minutes to ensure that the hydrogen content is less than 3ppm.

[0041] The continuous casting adopts electromagnetic stirring and light reduction process, the superheat degree of the tundish is 15℃, and the carbon segregation index in the center of the billet is 1.03. After the continuous casting of the continuous casting billet is completed, it enters the slow cooling pit for slow cooling for 72 hours.

[0042] The billet was heated to 1150°C and held for 100 minutes.

[0043] The steel billet after dephosphorization is subjected to 6+8 passes of roughing and intermediate rolling, 4 passes of pre-finis...

Embodiment 2

[0046]Smelting molten steel and continuous casting into billets, the weight percentages of steel components are: C 1.05%, Si 0.25%, Mn 0.25%, Cr 1.65%, P 0.018%, S 0.025%, Mo 0.10%, Ni 0.10%, Cu 0.25% , O 0.0010%, the balance is Fe and trace impurities.

[0047] The molten steel is refined in a RH furnace with a vacuum degree of 70Pa and a vacuum cycle treatment time of 38 minutes to ensure that the hydrogen content is less than 3ppm.

[0048] The continuous casting adopts electromagnetic stirring and light reduction process, the superheat degree of the tundish is 18℃, and the carbon segregation index in the center of the billet is 1.02. After the continuous casting of the continuous casting billet is completed, it enters the slow cooling pit for slow cooling for 74 hours.

[0049] The billet was heated to 1150°C and held for 105 minutes.

[0050] The billet after dephosphorization is subjected to 6+8 passes of roughing and intermediate rolling, 4 passes of pre-finishing rol...

Embodiment 3

[0053] Smelting molten steel and continuous casting into billets, the weight percentages of steel components are: C 1.00%, Si 0.35%, Mn 0.40%, Cr 1.55%, P 0.017%, S 0.020%, Mo 0.05%, Ni 0.15%, Cu 0.15% , O 0.0008%, the balance is Fe and trace impurities.

[0054] The molten steel is refined in a RH furnace with a vacuum degree of 80Pa and a vacuum cycle treatment time of 42 minutes to ensure that the hydrogen content is less than 3ppm.

[0055] The continuous casting adopts electromagnetic stirring and light reduction process, the superheat degree of the tundish is controlled at 12℃, and the carbon segregation index in the center of the billet is 0.98. After the continuous casting of the continuous casting billet is completed, it enters the slow cooling pit for slow cooling for 75 hours.

[0056] The billet was heated to 1100°C and held for 110 minutes.

[0057] The billet after dephosphorization is subjected to 6+8 passes of roughing and intermediate rolling, 4 passes of pr...

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Abstract

The invention discloses a bearing steel wire rod and a production method thereof. The bearing steel wire rod is prepared from, by mass, 0.95-1.05% of C, 0.15-0.35% of Si, 0.25-0.45% of Mn,1.40-1.65% of Cr, 0.025% or less of P, 0.025% or less of S, 0.02-0.10% of Mo, 0.10-0.30% of Ni, 0.10-0.25% of Cu, 0.0012% or less of O, and the balance Fe and trace impurities. The production method comprises the following procedures of RH furnace refining, continuous casting, slow cooling, heating, dephosphorization post-rolling, spinning and air patenting. According to the bearing steel wire rod and the production method thereof, fish eye fractures and abnormal structure fractures in the rapid cooling process are prevented through control of the smelting process; and by means of rolling control and cool control, the grain size, network carbide and pearlite interlamellar spacing of the rolled wire rod are controlled, a good spheroidizing annealing preparation structure is obtained, and the spheroidizing annealing time can be remarkably shortened.

Description

technical field [0001] The invention relates to a bearing steel wire rod and a production method thereof, belonging to the technical field of iron and steel material production. Background technique [0002] Bearing industry is one of the important basic industries and an important symbol of a country's industrial technology level. Bearing steel requires materials with high contact fatigue strength, hardness and purity, as well as good wear resistance, organizational stability and impact toughness. Bearing steel is generally delivered in a hot-rolled state, and needs to be spheroidized annealed before downstream bearing manufacturing. Through spheroidizing annealing, a structure in which fine spherical carbide particles are uniformly distributed on the ferrite matrix can be obtained. Spheroidizing annealing reduces the hardness of bearing steel, which is beneficial to cutting and machining. [0003] The spheroidizing annealing time of bearing steel is generally long, and ...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/12C22C38/08C22C38/16C21D8/02
CPCC21D8/0247C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 苑希现王伟田新中张治广赵铮铮逯志方宋振平孟耀青黄翠环孔令波
Owner XINGTAI IRON & STEEL
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