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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: 2014-12-03
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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Embodiment Construction

[0015] The present invention will be further described below through embodiment.

[0016] A production process of low-alloy high-strength steel cold-rolled sheet with high-strength plastic product for automobiles, including smelting, hot-rolling, and cold-rolling processes. The mass percentage of the chemical composition of the low-alloy high-strength steel is: 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 described 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 blowing oxygen from the top gun and argon blowing from the bottom of the furnace throughout the whole process. During the blowing process, lime and other slagging materials are added to melt the slag throughout the process. The slag alkalinity is controlled at 4.0 to 4.5...

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PUM

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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 low-alloy high-strength steel cold-rolled plate with high-strength plastic product for automobiles, belonging to the technical field of metallurgy. Background technique [0002] With the development of the automobile industry, the types and output of domestic mid- and low-end cars and commercial trucks are increasing. For the above-mentioned automobiles, due to their cost constraints, advanced high-strength steel DP, TRIP and other steel types are rarely used for components with high strength requirements such as structural parts and reinforcements, and low-alloy high-strength steel cold-rolled plates are mainly used. 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. Therefore, it is necessary to study a low-alloy high-strength steel with high strength and plasticity. Content...

Claims

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Application Information

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Patent Type & Authority Patents(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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