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Steel for 12-ton axle shell and production method for steel

A technology for axles and axle housings, which is applied in the steel for 12-ton axle axle housings and its production field, which can solve the problems of large differences in technical conditions, large consumption of raw materials, high strength and low strength, etc., and achieve the elimination of thermal fatigue damage, The effect of avoiding the decrease of strength and improving the fatigue life

Active Publication Date: 2012-03-21
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these materials are used for automobile beams, hot-rolled steel sheets with a thickness of 10mm or less are mass-produced to make automobile frames, and their high strength and low plasticity characteristics cannot meet the complex stamping requirements of the axle housing.
Therefore, compared with the stamped and welded axle housing steel with a thickness of 12-16mm, the technical conditions of the factory are quite different, resulting in many problems in the production, such as poor forming accuracy of parts, high scrap rate, complicated stamping process, and large consumption of raw materials.
The deficiencies of these steels are easy to crack after stamping, welding and shaping, which seriously affects the quality and service life of the product

Method used

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  • Steel for 12-ton axle shell and production method for steel
  • Steel for 12-ton axle shell and production method for steel
  • Steel for 12-ton axle shell and production method for steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The steel plate used for the axle housing is 12 mm thick.

[0036] The 12-ton steel for axle housing has the following chemical composition and weight percentage: C: 0.041%, Si: 0.10%, Mn: 1.29%, P: 0.025%, S: 0.002%, Al: 0.01%, Nb: 0.047%, the remainder is Fe and unavoidable impurities.

[0037] The method of producing 12-ton steel for axle housing, its steps:

[0038] 1) Conduct converter smelting, and control the tapping temperature at 1695℃~1700℃;

[0039] 2) Vacuum treatment: the treatment time is 13 minutes, and the vacuum degree is kept at 800Pa;

[0040] 3) Continuous casting is carried out, and the drawing speed is controlled at 0.85 m / min;

[0041] 4) Heating the casting slab, the heating temperature is 1230℃~1240℃, and the heating time is 115 minutes;

[0042] 5) Carry out rough rolling and control the end temperature at 1055℃~1060℃;

[0043] 6) Use 7 stands for finishing rolling, control the final rolling temperature at 810℃~815℃, and the reduction rate of the last thre...

Embodiment 2

[0047] The steel plate used for the axle housing is 14 mm thick.

[0048] 12-ton steel for axle housing, its chemical composition and weight percentage are: C: 0.068%, Si: 0.25%, Mn: 1.12%, P: 0.024%, S: 0.001%, Al: 0.020%, Nb: 0.042%, the remainder is Fe and unavoidable impurities.

[0049] The method of producing 12-ton steel for axle housing, its steps:

[0050] 1) Conduct converter smelting, and control the tapping temperature at 1700℃~1705℃;

[0051] 2) Vacuum treatment: the treatment time is 12 minutes, and the vacuum degree is kept at 820Pa;

[0052] 3) Continuous casting is carried out, and the drawing speed is controlled at 0.88 m / min;

[0053] 4) Heating the cast slab, the heating temperature is 1210℃~1220℃, and the heating time is 120 minutes;

[0054] 5) Carry out rough rolling and control the end temperature at 1070℃~1075℃;

[0055] 6) Use 7 stands for finishing rolling, control the final rolling temperature at 820℃~830℃, and the reduction rates of the last three passes at 23...

Embodiment 3

[0059] The steel plate used for the axle housing is 16 mm thick.

[0060] 12-ton steel for axle housing, its chemical composition and weight percentage are: C: 0.062%, Si: 0.55%, Mn: 1.20%, P: 0.016%, S: 0.003%, Al: 0.049%, Nb: 0.045%, the remainder is Fe and unavoidable impurities.

[0061] The method of producing 12-ton steel for axle housing, its steps:

[0062] 1) Conduct converter smelting and control the tapping temperature at 1692℃~1697℃;

[0063] 2) Vacuum treatment: the treatment time is 15 minutes, and the vacuum degree is kept at 850Pa;

[0064] 3) Carry out continuous casting, control the drawing speed at 0.9 m / min;

[0065] 4) Heating the casting slab, the heating temperature is 1230℃~1240℃, and the heating time is 130 minutes;

[0066] 5) Carry out rough rolling and control the end temperature at 1075℃~1085℃;

[0067] 6) Use 7 stands for finishing rolling, control the final rolling temperature at 830℃~840℃, and the reduction rate of the last three passes at 23%, 28% and 35% ...

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Abstract

The invention relates to steel for a 12-ton axle shell and a production method for the steel. The steel comprises the following chemical components in percentage by weight: 0.004-0.068 percent of C, 0.10-0.60 percent of Si, 1.0-1.29 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.008 percent of S, 0.01-0.06 percent of Al, 0.03-0.048 percent of Nb and the balance of Fe and unavoidable impurities. The production method comprises the following steps of: smelting in a converter; treating in vacuum; performing continuous casting; heating a casting blank; performingrough rolling; performing finish rolling by using a 7 machine frame; performing laminar flow cooling; and coiling. The steel has low carbon content, so that the steel has excellent punching and forming performance and welding performance; the size after the steel is cooled and formed is stable and can fully meet manufacturing and using requirements of the 12-ton axle shell; and through a bench test on the manufactured 12-ton axle shell assembly, the vertical bending fatigue life, the vertical bending rigidity and the vertical bending static strength of the 12-ton axle shell assembly are excellent.

Description

Technical field [0001] The invention relates to steel for heavy trucks and a production method, in particular to steel for a 12-ton axle axle housing and a production method. Background technique [0002] The axle is one of the main components of the automobile driving system. It supports the weight of the frame and subsequent assemblies of the frame, and at the same time it protects the components in the transmission system. In the field of axle housing manufacturing in the vehicle axle industry, there are two completely different product manufacturing methods: stamping and welding axle housings and casting axle housings. With the development of axle housing manufacturing technology and the need for weight reduction and energy saving of automobiles, especially for the drive axle housings of trucks, hot continuous rolled steel plates with a thickness of 12 to 16 mm have been used to fabricate the stamped and welded axle housings, replacing the complicated manufacturing process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12
Inventor 刘永前彭涛周祖安陈宇赵江涛刘斌杨海林黄成红
Owner 武汉钢铁有限公司
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