Manufacturing process of automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation

A high-strength plastic product and production process technology, applied in the field of metallurgy, can solve the problems of low elongation, low mechanical property margin, etc., and achieve the effect of stable quality control

Inactive Publication Date: 2013-05-08
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength-plasticity of general low-alloy high-strength steel is only about 12GPa%. When the strength is increased to more than 500MPa, the elongation is very low. The special needs of trucks, so it is necessary to study a low-alloy high-strength steel with high strength and plasticity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The present invention will be further illustrated by the following examples.

[0016] A production process for high-strength plastic product low-alloy high-strength steel cold-rolled sheets for automobiles, including smelting, hot rolling, and cold-rolling. The low-alloy high-strength steel uses a mass percentage of chemical composition: C: 0.05%-0.08%; Si :0.25%~0.35%; Mn: 0.85%~0.95%; S≤0.008%; P≤0.015%; Ti: 0.005%~0.02%; Nb: 0.04%~0.05%; the rest is Fe.

[0017] The smelting process, in addition to obtaining the aforementioned chemical composition, also needs to make the molten steel pure, including the following steps:

[0018] (1) The converter adopts the blowing mode of oxygen blowing from the top gun and argon blowing at the bottom of the furnace with stirring. In the blowing process, lime and other slag materials are added to dissolve the slag. The basicity of the slag is controlled at 4.0-4.5; the blowing control target: [C]≤0.05%, [P]<0.007%, [S]≤0.025%, [N]≤20ppm; ...

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Abstract

The invention relates to a manufacturing process of an automobile low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation, and belongs to the technical field of metallurgy. The technical scheme of the invention is as follows: the manufacturing process comprises a smelting process, a hot rolling process and a cold rolling process, wherein in the cold rolling process, the annealing temperature control is as follows: the soaking temperature is 840-860 DEG C, the slow cooling temperature is 670-700 DEG C, the rapid cooling temperature is 410-430 DEG C, and the aging finish temperature is 350-370 DEG C; and according to strip steel of different thickness specifications, different annealing tape speed target values are planed: the tape speed of the strip steel of 0.8mm specification is 205m / min, the tape speed of the strip steel of 1.0mm specification is 165m / min, the tape speed of the strip steel of 1.2mm specification is 137m / min, the tape speed of the strip steel of 1.5mm specification is 110m / min, the tape speed of the strip steel of 1.8mm specification is 92m / min, the tape speed of the strip steel of 2.0mm specification is 82m / min, and the tape speed of the strip steel of 2.5mm specification is 66m / min. The manufacturing process of the automobile low-alloy high-strength steel cold-rolled sheet with the high product of strength and elongation disclosed by the invention has the beneficial effects that the low-alloy high-strength steel cold-rolled sheet with high product of strength and elongation is produced by modifying the chemical elements and optimizing the hot rolling and cold rolling processes so that the product of strength and elongation of the low-alloy high-strength steel cold-rolled sheet reach 15GPa%, and simultaneously the quality is stably controlled.

Description

Technical field [0001] The invention relates to a production process of a high-strength plastic product low-alloy high-strength steel cold-rolled plate for automobiles, and belongs to the technical field of metallurgy. Background technique [0002] With the development of the automobile industry, the types and output of domestic low-end cars and commercial trucks are increasing. For the above-mentioned cars, due to their cost constraints, structural parts, reinforcements and other components with higher strength requirements rarely use advanced high-strength steels such as DP and TRIP, and mainly use low-alloy high-strength steel cold-rolled plates. However, the general strong plastic product of low-alloy high-strength steel is only about 12GPa%. When the strength is increased to more than 500MPa, the elongation is very low. When producing slightly complex structural parts, the margin of mechanical properties is very low, which cannot meet the requirements of low-end cars and com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 彭兆丰吝章国谷凤龙王连轩李守华程迪赵渭良孙海燕杨西鹏杨帆郭振国
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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