Cold-rolled shifting fork steel member for automobile and producing method

A technology for shifting fork and production method, which is applied in the field of steel for auto parts, can solve the problems of decreased strength, difficulty in meeting the surface hardness of shifting fork, increase in grain size, etc.

Active Publication Date: 2015-11-25
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the material described in Patent Document 1 is difficult to meet the surface hardness required by the shift fork. The shift fork teeth must be subjected to high-frequency quenching and tempering to obtain HRC ≥ 48 requirements. The material

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  • Cold-rolled shifting fork steel member for automobile and producing method
  • Cold-rolled shifting fork steel member for automobile and producing method
  • Cold-rolled shifting fork steel member for automobile and producing method

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[0061] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0062] Chemical composition design: The chemical composition and weight percentage of steel components of steel components are: C: 0.20~0.35%, Si: 0.10~0.35%, Mn: 0.50~1.50%, Cr: 0.40~1.50%, Ca: 0.0030~0.0070 %, B: 0.0008~0.005%, Ni: 0.40~1.10%, Als: 0.015~0.030%, Nb: 0.015~0.040%, Ti: 0.015~0.030%, P≤0.015, S≤0.008, the rest is Fe and non Avoid impurities.

[0063] The process flow is as follows:

[0064] 1) Smelting and continuous casting into billets;

[0065] 2) Slow cooling of the cast slab, the slow cooling time is not less than 72 hours;

[0066] 3) Heating the slab, the heating temperature is controlled at 1200~1280℃, and the furnace time is at 300~400min;

[0067] 4) Descale with high pressure water;

[0068] 5) Hot rolling: control the finishing temperature of rough rolling at 1100±50℃, and the reduction rate is not less than 65%; control the fini...

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Abstract

The invention discloses a cold-rolled shifting fork steel member for an automobile and a producing method. The cold-rolled shifting fork steel member is characterized by comprising the steel chemical ingredients, by weight percentage, of 0.20-0.35% of C, 0.10-0.35% of Si, 0.50-1.50% of Mn, 0.40-1.50% of Cr, 0.0030-0.0070% of Ca, 0.0008-0.005% of B, 0.40-1.10% of Ni, 0.015-0.030% of Als, 0.015-0.040% of Nb, 0.015-0.030% of Ti, smaller than or equal to 0.15% of P, smaller than or equal to 0.008% of S, the balanced of Fe and unavoidable impurities. By means of appropriate hot rolling, cold rolling and cover annealing, the excellent accurate stamping performance can be achieved. The shifting fork portion is quenched and tempered, so that the hardness of the work portion of the shifting fork portion is greatly improved, and the service life of the shifting fork portion is prolonged.

Description

technical field [0001] The invention relates to the technical field of steel for automobile parts, in particular to a cold-rolled shift fork steel component for automobiles and a production method. Background technique [0002] Clutch release forks and shift forks of modern automobiles require complex shapes, high surface hardness after local high-frequency quenching, and good matrix toughness. The traditional methods of producing shift forks mainly include: (1) pouring blank → forging molding → normalizing → cold forming → machining → partial high-frequency quenching → tempering → cleaning. (2) Casting steel base → surface coating alloy modification treatment → finishing → surface heat treatment quenching and tempering. This type of method has low production efficiency, high cost and unstable product quality. [0003] However, using high-precision hot-rolled or cold-rolled steel strips to manufacture automobile clutch release shift forks by blanking method has the advanta...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/02C21D1/26
Inventor 程吉浩刘文斌董中波郭斌刘敏杜涛邹德辉
Owner 武汉钢铁有限公司
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