Production method of 600MPa grade cold rolling dual-phase steel

A production method and dual-phase steel technology, applied in the field of metallurgical plate production, can solve problems such as unfavorable continuous production and reduced smelting castability, and achieve the effects of low cost, good production continuity and stable product quality

Inactive Publication Date: 2012-10-31
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology

When the Al content is high, the pourability of smelting is signi

Method used

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  • Production method of 600MPa grade cold rolling dual-phase steel
  • Production method of 600MPa grade cold rolling dual-phase steel
  • Production method of 600MPa grade cold rolling dual-phase steel

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Example Embodiment

[0013] The present invention will be further illustrated by the following examples.

[0014] In the embodiment, a production method of 600MPa grade cold-rolled dual-phase steel includes converter smelting, LF refining, continuous casting, hot rolling, and cold rolling and continuous withdrawal processes, and the mass percentage of the final chemical composition is: C: 0.06-0.09 %, Si: 0.4-0.6, Mn: 1.65-1.75, P≤0.01%, S≤0.015%, Als: 0.025-0.06%, N≤0.004%, the remainder is Fe; molten iron requirements for converter smelting process: S≤0.040 %, the desulfurization target S≤0.010%, the addition of scrap steel accounts for 4-8% of the total mass of molten iron, and the ratio of molten iron is ≥85%.

[0015] 1. Converter smelting, LF refining, continuous casting process

[0016] The final steel chemical composition is shown in Table 1.

[0017] Table 1 Chemical composition

[0018] (chemical composition: wt%)

[0019]

[0020] Example 1 is used to illustrate: molten iron cond...

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Abstract

The invention relates to a production method of 600MPa grade cold rolling dual-phase steel and belongs to the technical field of metallurgical sheet material production. The technical scheme of the production method comprises working procedures of smelting in a converter, LF (ladle furnace) refining, continuous casting, hot rolling, cold rolling and continuous annealing. The final chemical components according to mass percent are as follows: 0.06-0.09% of C, 0.4-0.6% of Si, 1.65-1.75% of Mn, less than or equal to 0.01% of P, less than or equal to 0.015% of S, 0.025-0.06% of Als, less than or equal to 0.004% of N, and the balance of Fe. Molten iron requirements in the procedure of smelting in the converter are as follows: S is less than or equal to 0.040%, desulfurization target S is less than or equal to 0.010%, added steel scrap is 4-8% of total mass of the molten iron, and hot metal ratio is more than or equal to 85%. In the production method, no alloy element is added; composition of C-Si-Mn series dual-phase steel is improved; Si content is decreased; Al content is increased; and cold rolling dual-phase steel with low yield ratio and high elongation coefficient is produced by improving smelting, hot rolling, cold rolling and continuous annealing processes; the cost is low; the production procedures are continuous; and the product quality is stable. The mechanical property of the finished product is as follows: yield strength is about 360-430MPa, tensile strength is more than or equal to 600MPa, and elongation coefficient is more than or equal to 25%.

Description

technical field [0001] The invention relates to a production method of 600MPa grade cold-rolled dual-phase steel, belonging to the technical field of metallurgical plate production. Background technique [0002] At present, the composition systems for producing 600MPa grade cold-rolled dual-phase steel are mainly C-Si-Mn series, C-Si-Mn-Cr series, C-Si-Mn-Cr-Mo, C-Si-Mn-Nb and C -Al-Mn series, etc. The difficulty in producing cold-rolled dual-phase steel lies in the need to control a high cooling rate and a low final cooling temperature during annealing, so that there are two phases of ferrite and martensite in the cold-rolled finished product. When the cooling rate is slow or the final cooling temperature is high, the volume fraction of martensite formed is insufficient, or even martensite cannot be formed, resulting in low tensile strength of the finished product and affecting product quality. However, the high cooling rate and low final cooling temperature require highe...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/00
Inventor 吝章国何方李守华徐斌石建强蒋建朋胡朝辉侯钢铁
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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