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A kind of 590mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof

A dual-phase steel and lightweight technology, which is applied in the field of metallurgical plates, can solve the problems of difficult control of the surface quality of the steel strip, affect the welding performance of the steel strip, and reduce the pourability of smelting, and achieve high initial work hardening rate and good cold forming The effect of high initial work hardening rate

Active Publication Date: 2020-11-20
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that in the prior art, the 600MPa grade automotive lightweight cold-rolled dual-phase steel has relatively high content of Mn (3.0%) and Al (2.0%), and the smelting castability is remarkable. Reduced, not conducive to continuous production, affecting the welding performance of the steel strip, high cost per ton of steel, and difficult to control the surface quality of the steel strip

Method used

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  • A kind of 590mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof
  • A kind of 590mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0050] Embodiment 1, preparation of cold-rolled dual-phase steel

[0051] Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. The converter smelting process is blown with argon, and scrap steel is added to the converter, and the tapping temperature of the converter is 1640°C. Then, the molten steel after converter smelting is subjected to LF external refining, and the refining temperature is ≥1560°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The slab continuous casting superheat is 20°C, after which the slab is cleaned, slowly cooled, and the quality of the continuous casting slab is inspected to obtain the slab;

[0052] The heating temperature of the slab is 1230° C., and the heating time is 225 m...

Embodiment 2

[0056] Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. The converter smelting process is blown with argon, and scrap steel is added to the converter, and the tapping temperature of the converter is 1632°C. Then, the molten steel after converter smelting is subjected to LF external refining, and the refining temperature is ≥1560°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The slab continuous casting superheat is 25°C, after which the slab is cleaned, slowly cooled, and the quality of the continuous casting slab is inspected to obtain the slab;

[0057] The heating temperature of the slab is 1230° C., and the heating time is 232 minutes. The heated slab is subjected to high-pressure water dephosph...

Embodiment 3

[0061] Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. The converter smelting process is blown with argon, and scrap steel is added to the converter, and the tapping temperature of the converter is 1650°C. Then, the molten steel after converter smelting is subjected to LF external refining, and the refining temperature is ≥1560°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The superheat degree of the slab continuous casting is 30°C, after which the slab is cleaned, slowly cooled, and the quality of the continuous casting slab is inspected to obtain the slab;

[0062] The heating temperature of the slab is 1220° C., and the heating time is 235 minutes. The heated slab is subjected to high-pressure ...

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Abstract

The invention discloses 590 MPa grade automobile light weight cold-rolled dual-phase steel which is prepared from the following components in percent by weight: 0.06-0.08% of C, 0.05-0.10% of Si, 1.70-1.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.020-0.050% of Alt and 0.20-0.30% of Cr. The invention also discloses a production method of the cold-rolled dual-phase steel. According to the cold-rolled dual-phase steel and the production method thereof, the ton steel production cost of the obtained cold-rolled dual-phase steel is low, the cold-rolled dual-phase steel is low in yield ratio and high in initial processing hardening rate, has good cold working forming property and has relatively high yield strength after formation by optimal control of component content and parameters in a rolling process. The steel is wide in market prospect, and meets the demand of social development favorably. The production method of the cold-rolled dual-phase steel is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of metallurgical plates, in particular to a 590MPa-level automobile lightweight cold-rolled dual-phase steel and a production method thereof. Background technique [0002] In 2017, my country's auto sales exceeded 28.8789 million, ranking first in the world for nine consecutive years. It is estimated that the auto output will reach 35 million in 2025. With the explosive growth of automobile production, the environmental and energy crisis has become increasingly serious, and energy conservation and emission reduction have become a major issue facing the automobile manufacturing industry. Using modern technologies and methods to reduce the weight of components or complete vehicles, and on the premise of ensuring safety and other performances, it has become a consensus to achieve the goal of energy saving, emission reduction and consumption reduction through weight reduction. Automobile lightweight technology h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D2211/005C21D2211/008C22C38/002C22C38/02C22C38/06C22C38/38
Inventor 白海瑞张秀飞
Owner BAOTOU IRON & STEEL GRP
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