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600 MPa level automobile axle housing steel and production method thereof

A production method and technology of axle housing steel, applied in the field of steel rolling, can solve the problems of low strength level, unfavorable vehicles, thick thickness, etc., and achieve good yield strength and tensile strength, elongation and impact toughness, good strength and toughness, To achieve the effect of material thickness

Active Publication Date: 2014-12-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The strength level is low, which is not conducive to material thinning and vehicle weight reduction
At present, Q345B is generally used in the production of hot-formed automobile axle housings in China. The material strength level is low and the thickness is thick, which makes it impossible to reduce vehicle weight.

Method used

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  • 600 MPa level automobile axle housing steel and production method thereof
  • 600 MPa level automobile axle housing steel and production method thereof
  • 600 MPa level automobile axle housing steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention provides a 600MPa grade automobile axle housing steel, which is composed of (percentage by weight): C: 0.21%-0.26%; Si: 0.51%-0.6%; Mn: 1.1%-1.5%; Al: 0.01%- 0.06%; P: ≤0.02%; S: ≤0.01%; V: 0.05%-0.06%; N: 0.012%-0.016%; the rest is Fe and unavoidable impurities, among which, V:N≤5:1.

[0030] In practical application, depending on the type of steel, it has different composition content. Please refer to Table 1 below, which is the composition list of different steel types.

[0031]In order to better illustrate and explain the present invention, the composition of the comparative example (the existing steel type) and the composition of the invention example (the steel type involved in the present invention) are listed in Table 1 for comparison.

[0032] Table 1

[0033] Steel No.

Embodiment 2

[0035] A kind of production method of 600MPa grade automobile axle housing steel provided by the invention, please refer to below figure 1 , is a flow chart of a specific production method in the embodiment of the present application, specifically as follows.

[0036] S101, performing converter smelting, vacuum treatment, and continuous casting to obtain a billet.

[0037] The composition of the slab is (weight percent): C: 0.21%-0.26%; Si: 0.51%-0.6%; Mn: 1.1%-1.5%; Al: 0.01%-0.06%; P: ≤0.02% ; S: ≤0.01%; V: 0.05%-0.06%; N: 0.012%-0.016%;

[0038] S102, heating the cast slab to 1150° C. to 1220° C. in a heating furnace, and the heating time is more than 180 minutes.

[0039] S103, rough rolling is carried out, and the rolling pass is 6-8 passes.

[0040] S104, performing continuous finish rolling with 6 or 7 rolling passes, controlling the finish rolling entrance temperature to be 950°C-990°C, and the finish rolling temperature to be 800°C-840°C.

[0041] S105, use the fr...

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Abstract

The invention discloses 600 MPa level automobile axle housing steel and a production method of the 600 MPa level automobile axle housing steel. Compositions of the steel comprise, by weight, 0.21 percent to 0.26 percent of C, 0.51 percent to 0.6 percent of Si, 1.1 percent to 1.5 percent of Mn, 0.01 percent to 0.06 percent of Al, P smaller than or equal to 0.02 percent, S smaller than or equal to 0.01 percent, 0.05 percent to 0.06 percent of V, 0.012 percent to 0.016 percent of N, and the balance Fe and inevitable impurities. The ratio of V to N is smaller than or equal to 5:1. According to the method, the accurate V content, the accurate N content and the controlled rolling and controlled cooling process window are designed, hot rolling strip steel for a 600 MPa level automobile axle housing is produced, the strip steel has the good strength and toughness, and meanwhile various mechanical performance indexes of the axle housing after hot forming at the temperature more than 800 DEG C can be ensured. The method can be applied to automobile axle housing production, the thickness of materials can be effectively reduced, and on the premise that the safety of an automobile is ensured, the lightweight aim can be effectively achieved.

Description

technical field [0001] The present application relates to the technical field of steel rolling, in particular to a 600MPa grade automobile axle housing steel and a production method thereof. Background technique [0002] The lightweight of the car is to reduce the curb weight of the car as much as possible under the premise of ensuring the strength and safety performance of the car, so as to improve the power of the car, reduce fuel consumption, and reduce exhaust pollution. Due to the needs of environmental protection and energy saving, automobile lightweight has become an urgent task and a trend of development in the development of the automobile industry. Especially in the industry of large passenger cars, heavy trucks, special vehicles, and semi-trailers, applying higher-strength materials to auto parts can significantly reduce the weight of the vehicle, increase the load, and improve the service life of vehicle components, bringing logistics companies. The advantage is...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04
Inventor 潘辉李飞王全礼朱国森周娜郭佳王伦姚志强吴科敏
Owner SHOUGANG CORPORATION
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