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Steel for 13-dwt vehicle axle housing and production method thereof

A technology of axle housing and production steps, which is applied in the field of 13-ton axle housing steel and its production, can solve problems such as affecting product quality and service life, large differences in technical conditions, unsatisfactory plastic characteristics, etc., and achieve energy saving. The effect of emission reduction is obvious, the actual mechanical properties are good, and the effect of eliminating thermal fatigue damage

Active Publication Date: 2014-04-09
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 disadvantage of these steels is that they are easy to crack after stamping, welding and shaping, which seriously affects the quality and service life of the products.

Method used

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  • Steel for 13-dwt vehicle axle housing and production method thereof
  • Steel for 13-dwt vehicle axle housing and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The steel plates for axle housings produced are 14 mm thick.

[0032] The chemical composition and weight percentage of 13-ton axle housing steel are: C: 0.042%, Si: 0.10%, Mn: 1.31%, P: 0.025%, S: 0.005%, Al: 0.01%, Nb: 0.06%, Ti: 0.031%, the remainder is Fe and unavoidable impurities.

[0033] The method for producing 13 tons of steel for axle housings, the steps:

[0034] 1) Carry out converter smelting, and control the tapping temperature at 1710°C to 1715°C;

[0035] 2) Carry out vacuum treatment: the treatment time is 13 minutes, and the vacuum degree is kept at 730Pa;

[0036] 3) Carry out continuous casting, control casting speed at 1.0 m / min;

[0037] 4) Heating the slab, the heating temperature is 1240°C-1250°C, and the heating time is 140 minutes;

[0038] 5) Rough rolling is carried out, and the end temperature is controlled at 1050°C to 1060°C;

[0039] 6) Use 7 stands for finish rolling, control the final rolling temperature at 760°C to 770°C, and the...

Embodiment 2

[0043] The steel plates for axle housings produced are 16 mm thick.

[0044]The chemical composition and weight percentage of steel for 13-ton axle axle housings are: C: 0.047%, Si: 0.28%, Mn: 1.35%, P: 0.020%, S: 0.0032%, Al: 0.025%, Nb: 0.053%, Ti: 0.036%, the rest is Fe and unavoidable impurities.

[0045] The method for producing 13 tons of steel for axle housings, the steps:

[0046] 1) Carry out converter smelting, and control the tapping temperature at 1715°C to 1720°C;

[0047] 2) Carry out vacuum treatment: the treatment time is 15 minutes, and the vacuum degree is kept at 740Pa;

[0048] 3) Carry out continuous casting, control casting speed at 1.05 m / min;

[0049] 4) Heating the slab, the heating temperature is 1250°C-12605°C, and the heating time is 145 minutes;

[0050] 5) Rough rolling is carried out, and the end temperature is controlled at 1070°C to 1080°C;

[0051] 6) Use 7 stands for finish rolling, control the final rolling temperature at 770°C to 780°C...

Embodiment 3

[0055] The steel plates for axle housings produced are 12 mm thick.

[0056] The chemical composition and weight percentage of 13-ton axle housing steel are: C: 0.064%, Si: 0.56%, Mn: 1.40%, P: 0.02%, S: 0.004%, Al: 0.052%, Nb: 0.058%, Ti: 0.045%, the remainder is Fe and unavoidable impurities.

[0057] The method for producing 13 tons of steel for axle housings, the steps:

[0058] 1) Converter smelting is carried out, and the tapping temperature is controlled at 1710°C to 1716°C;

[0059] 2) Carry out vacuum treatment: the treatment time is 15 minutes, and the vacuum degree is kept at 770Pa;

[0060] 3) Carry out continuous casting, control casting speed at 1.1 m / min;

[0061] 4) Heating the slab, the heating temperature is 1260℃~1270℃, and the heating time is 150 minutes;

[0062] 5) Rough rolling is carried out, and the end temperature is controlled at 1070°C to 1080°C;

[0063] 6) Use 7 stands for finish rolling, control the final rolling temperature at 785°C to 795°...

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Abstract

The invention relates to steel for 13-dwt vehicle axle housing and a production method thereof. The steel comprises the following chemical components by weight: 0.04%-0.08% of C, 0.10%-0.60% of Si, 1.3%-1.45% of Mn, not more than 0.025% of P, not more than 0.08% of S, 0.01%-0.06% of Al, 0.04%-0.06% of Nb, 0.03%-0.05% of Ti, and the balance of Fe and inevitable impurities; The preparation method comprises the following steps: converter smelting; vacuum treatment; continuous casting; casting blank heating; rough rolling; finish rolling by a 7 frame; cooling with laminar flow; coiling. Because of the low carbon content of the steel of the invention, the steel has excellent stamping performance and welding performance, has a stable dimension after cold forming, and completely meets the requirements for manufacturing and application of 13-dwt vehicle axle housing. Through bench tests of the manufactured 13-dwt vehicle axle housing assembly, the product has excellent vertical bending fatigue life, vertical bending rigidity, and vertical bending static strength, and completely meets the requirements of users.

Description

technical field [0001] The invention relates to steel for tractors and a production method, in particular to steel for 13-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 stamped and welded axle housings, replacing the complex manufacturing process and production. Inefficient, bulky and expe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 刘永前赵江涛陈宇周祖安刘斌彭涛杨海林黄成红
Owner 武汉钢铁有限公司
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