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Hot-stamping process capable of improving strength of finished product of hot-stamped axle housing steel

A technology for hot stamping and axle housing steel, applied in the field of iron and steel smelting and rolling, can solve problems such as strength reduction, and achieve the effects of reducing heating temperature, saving electricity consumption, and shortening stamping interval time.

Active Publication Date: 2020-09-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is a problem that the strength of the steel for the axle housing decreases significantly after hot forming. Many products have been developed for the steel for the axle housing in China, but very few of them consider the impact of the final hot forming process on the strength. Among them, the patent application number 201410432234.3 is published. "A 600MPa grade automobile axle housing steel and its production method", by adding higher V and N element content and precise controlled rolling and controlled cooling process control, the 600MPa grade automobile axle housing hot-rolled steel strip was produced, and at the same time It can guarantee the mechanical properties of the rear axle housing after thermoforming above 800°C; this patent starts from the composition design of raw materials, and achieves the purpose of controlling the performance after thermoforming by optimizing the structure and precipitation; but currently there is no hot stamping process Research, so as to achieve the effect of reducing the performance decline after thermoforming

Method used

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  • Hot-stamping process capable of improving strength of finished product of hot-stamped axle housing steel
  • Hot-stamping process capable of improving strength of finished product of hot-stamped axle housing steel
  • Hot-stamping process capable of improving strength of finished product of hot-stamped axle housing steel

Examples

Experimental program
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Effect test

preparation example Construction

[0052] As some optional implementations, the preparation method of the axle housing steel material includes the following steps:

[0053] Continuous casting slabs are obtained by smelting molten iron, and the continuous casting slabs are composed of the following chemical elements in mass fractions: C: 0.26-0.30%; Si: 0-0.1%; Mn: 1.8-2.2%; P: ≤0.010%; S: ≤0.005%; Al: 0.02-0.05%; V: 0.01-0.03%; N: 0-0.003%; the rest is Fe and unavoidable impurities;

[0054] heating the continuous casting slab and keeping it warm;

[0055] performing rough rolling on the heated and heat-preserved continuous casting slab to obtain an intermediate slab;

[0056] Finish rolling the intermediate slab to obtain steel strip;

[0057] laminar cooling of the steel strip and coiling to obtain a hot-rolled steel coil;

[0058] After the hot-rolled steel coil is cooled to room temperature, it is coiled to obtain an axle housing steel material.

[0059] As some optional implementations, the holding tem...

experiment example

[0075] The axle housing steel materials and finished axle housing steel products prepared in Examples 1-3 were subjected to mechanical property tests, and the test results are shown in Table 4.

[0076] Table 4

[0077]

[0078] As can be seen from Table 4, the yield strength and tensile strength of the axle housing steel finished products produced by the hot stamping process for improving the strength of the hot stamping axle housing steel products provided by the present invention are all less than 50 MPa, and the axle housing surface quality is excellent at the same time , due to the use of a lower heating temperature, saving electricity.

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Abstract

The invention relates to a hot-stamping process capable of improving the strength of a finished product of hot-stamped axle housing steel, and belongs to the technical field of iron and steel smeltingand rolling. According to the hot-stamping process capable of improving the strength of the finished product of the hot-stamped axle housing steel, the purpose of controlling the declining quantitiesof the yield strength and the tensile strength of the finished product of the axle housing steel to be less than or equal to 50 MPa can be achieved, and the excellent surface quality effect is achieved; and meanwhile the heating temperature is decreased so that the electricity consumption can be reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting and rolling, in particular to a hot stamping process for improving the strength of a hot stamped axle housing steel product. Background technique [0002] As one of the three major assemblies of commercial vehicles, the axle has received more and more attention in recent years. The rear axle housing is one of the important parts of medium and heavy-duty commercial vehicles. Under dynamic load conditions, the axle housing is required to reduce the mass of the axle housing under the condition of sufficient strength and rigidity. In addition, the axle housing should also have the advantages of simple structure, low manufacturing cost, and easy disassembly, adjustment, repair and maintenance of the main reducer. [0003] At present, my country's automobile industry has widely used hot-rolled axle housing steel plates with a thickness of 12 to 20 mm to make stamped and welded axle hous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/02B21D37/16C21D8/02C22C38/00C22C38/02C22C38/04C22C38/06C22C38/12
CPCB21D22/022B21D37/16C21D8/0205C21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/06C22C38/12C22C38/001C21D2211/001C21D2211/005C21D2211/009
Inventor 惠亚军吴科敏李飞田志红刘锟陈斌潘辉周娜李秋寒许克好曹杰牛涛肖宝亮杜倩崔阳徐伟张大伟李晓林
Owner SHOUGANG CORPORATION
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