Automotive axle housing steel and preparation method thereof

A technology for axle housing steel and automobiles, which is applied in the field of steel plate manufacturing, can solve the problems of unfavorable welding performance and formability of steel plates, and achieve the effects of improving welding and forming performance, improving toughness and reducing ductile-brittle transition temperature.

Inactive Publication Date: 2015-05-20
HEBEI PUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly uses carbon to increase the strength of the steel and utilizes the precipitation of V and N to strengthen the effect. Although it can provide a tensile strength of 600MPa, it is unfavorable to the weldability and formability of the steel plate.

Method used

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  • Automotive axle housing steel and preparation method thereof
  • Automotive axle housing steel and preparation method thereof
  • Automotive axle housing steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Carry out converter smelting. During the smelting process, oxygen is blown on the top of the converter, argon is blown on the bottom of the converter, carbon is drawn once, and NbFe is added during the tapping of the converter; After LF refining treatment, the casting slab with a thickness of 200mm is finally obtained by protective casting. The weight percentage of each component in the obtained slab is: C: 0.08%, Si: 0.30%, Mn: 1.40%, P: ≤0.014%, S : ≤0.002%, Als: 0.030%, Nb: 0.012%, Ti: 0.065%, the rest is Fe and unavoidable impurities.

[0039] (2) Cut the billet into the size required by the heating furnace and heat it in the heating furnace. The temperature of the heating section is 1220°C, the temperature of the soaking section is 1180°C, and the total heating time is more than 180min.

[0040] (3) Rough rolling is carried out on the slab processed in step (2), the rough rolling start temperature is 1050°C, the rolling passes are 5-7 passes, and an intermediat...

Embodiment 2~5

[0043]Steps (2) to (4) of Examples 2 to 5 are the same as in Example 1, only the content of each component in the cast slab obtained in Step (1) is changed, see Table 1 for specific changes.

[0044] Table 1

[0045]

Embodiment 6~9

[0047] Get the cast slab obtained after the step (1) in Examples 6 to 9 for rolling operation, the cast slab number corresponds to its embodiment number, and the rolling operation is the same as the steps (2) to (4) in Example 1, only Change the rolling parameters in steps (2) to (4), see Table 2 for specific parameter changes.

[0048] Table 2

[0049]

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Abstract

The invention relates to automotive axle housing steel. The automotive axle housing steel comprises the following components in percentage by weight: 0.06-0.10% of C, 0.20-0.40% of Si, 1.30-1.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.008% of S, 0.020-0.040% of Als, 0.010-0.015% of Nb, 0.050-0.080% of Ti and the balance of Fe and unavoidable impurities. The invention also relates to a preparation method of the automotive axle housing steel. The preparation method comprises the following steps of converter smelting, LF refining, casting, roughing and finishing. By adding less alloying elements Ti and Nb and controlling the content of N and controlled rolling and cooling process, 600MPa-grade steel is obtained and has excellent mechanical properties and formability.

Description

technical field [0001] The invention relates to the field of steel plate manufacturing, in particular to a method for preparing a hot-rolled stamped axle housing steel for 600MPa grade automobiles. Background technique [0002] The axle housing is one of the main components of the automobile driving system. During use, it supports the weight of the frame and the subsequent assemblies of the frame, so it needs to be made of steel with sufficient strength and rigidity; in addition, the automobile axle housing It is formed by stamping and welding of steel plates, so the steel must also ensure good stamping performance and good welding performance. [0003] At present, there are no special steel grades and corresponding standards in the field of hot-rolled steel plates for automobile axle housings in China. Most automobile manufacturers use automobile girder steel (such as 16MnL) to manufacture automobile axle housings. In recent years, many steel mills have conducted research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21C5/28C21D8/02
Inventor 付中原陈建超刘生学程德朝
Owner HEBEI PUYANG IRON & STEEL
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