A kind of 450mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof

A dual-phase steel and lightweight technology, applied in the field of metallurgical plates, can solve the problems of difficult control of steel strip surface quality, high cost per ton of steel, high element content, etc., achieve high initial work hardening rate, reduce alloy cost, and high yield strength Effect

Active Publication Date: 2020-11-24
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 content of Nb element (0.050%) and Ti, Si element in 450MPa grade automotive lightweight cold-rolled dual-phase steel is high, the cost per ton of steel is high, and the steel Belt surface quality is difficult to control

Method used

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  • A kind of 450mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof
  • A kind of 450mpa grade automotive lightweight cold-rolled dual-phase steel and production method thereof

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Experimental program
Comparison scheme
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 1235° C., and the heating time is 220 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. Argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1630°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 230 minutes. The heated slab is subjected to high-pressure water dephos...

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 450 MPa grade automobile lightweight cold-rolled dual-phase steel. The 450 MPa grade automobile lightweight cold-rolled dual-phase steel comprises the following components including, by weight, 0.06%-0.08% of C, 0.05%-0.10% of Si, 1.05%-1.15% of Mn, not larger than 0.010% of P, not larger than 0.005% of S, 0.020%-0.050% of Alt and 0.20%-0.30% of Cr. The invention also discloses a production method for the cold-rolled dual-phase steel. By means of the cold-rolled dual-phase steel and the production method thereof, the component content and parameters in the rolling process are controlled in an optimized manner, the production cost of each ton of the cold-rolled dual-phase steel is low, the yield ratio is low, the initial work hardening rate is high, the cold workingformability is good, and the high yield strength is obtained after forming; and the market prospect is wide, and the needs of social development are better met. The production method of the cold-rolled dual-phase steel is simple in preparation method and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of metallurgical plates, in particular to a 450MPa-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): C22C38/02C22C38/04C22C38/06C22C38/18C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 白海瑞张秀飞
Owner BAOTOU IRON & STEEL GRP
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