Production method of steel for 12-ton axle shell

An axle and axle housing technology is applied in the production field of 12-ton axle housing steel, which can solve the problems of large differences in technical conditions, large consumption of raw materials, and low strength, so as to eliminate thermal fatigue damage and avoid The effect of strength reduction and fatigue life improvement

Active Publication Date: 2013-07-03
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since these materials are steels for automobile girders, 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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  • Production method of steel for 12-ton axle shell
  • Production method of steel for 12-ton axle shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The steel plates for axle housings produced are 12 mm thick.

[0036] The chemical composition and weight percentage of steel for 12-ton axle axle housings are: 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 for producing 12 ton class axle housing steel, its steps:

[0038] 1) Carry out converter smelting, and control the tapping temperature at 1695°C to 1700°C;

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

[0040] 3) Carry out continuous casting, control casting speed at 0.85 m / min;

[0041] 4) Heating the slab, the heating temperature is 1230°C-1240°C, and the heating time is 115 minutes;

[0042] 5) Rough rolling is carried out, and the end temperature is controlled at 1055°C to 1060°C;

[0043] 6) Use 7 stands for finish rolling, control the final rolling temperature at 810°C to 815°C, and the re...

Embodiment 2

[0047] The steel plates for axle housings produced are 14 mm thick.

[0048]The chemical composition and weight percentage of 12-ton axle housing steel 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 for producing 12 ton class axle housing steel, its steps:

[0050] 1) Carry out converter smelting, and control the tapping temperature at 1700°C to 1705°C;

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

[0052] 3) Carry out continuous casting, control casting speed at 0.88 m / min;

[0053] 4) Heating the slab, the heating temperature is 1210°C-1220°C, and the heating time is 120 minutes;

[0054] 5) Rough rolling is carried out, and the end temperature is controlled at 1070°C to 1075°C;

[0055] 6) Use 7 stands for finish rolling, control the final rolling temperature at 820°C to 830°C, and the reduct...

Embodiment 3

[0059] The steel plates for axle housings produced are 16 mm thick.

[0060] The chemical composition and weight percentage of steel for 12-ton axle axle housings 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 for producing 12 ton class axle housing steel, its steps:

[0062] 1) Converter smelting is carried out, and the tapping temperature is controlled at 1692°C to 1697°C;

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

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

[0065] 4) Heating the slab, the heating temperature is 1230°C-1240°C, and the heating time is 130 minutes;

[0066] 5) Rough rolling is carried out, and the end temperature is controlled at 1075°C to 1085°C;

[0067] 6) Use 7 stands for finish rolling, control the final rolling temperature at 830°C to ...

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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-duty trucks and a production method, in particular to steel for 12-ton axle housings and a production method. Background technique [0002] The axle is one of the main components of the vehicle driving system. It supports the weight of the frame and the subsequent assemblies of the frame, and at the same time protects the components in the transmission system. In the field of axle housing manufacturing in the 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 automobile weight reduction and energy saving, especially for the driving axle housing of trucks, hot-rolled steel plates with a thickness of 12 to 16 mm have been used to make punched and welded axle housings, replacing the complex manufacturing process, Cast axle housings with low produ...

Claims

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Application Information

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Patent Type & Authority Patents(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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