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Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof

A thick-gauge, steel plate technology is applied in the field of low-cost, thick-gauge, and uniform hot-rolled dual-phase steel plates and in the field of manufacturing. Realize the effect of industrialized mass production, low alloy cost, and reduced dependence on alloying elements

Active Publication Date: 2014-12-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problem that the existing technology cannot meet the problem of stable and mass-produced industrial production of thick-gauge high-strength hot-rolled dual-phase steel, and provides a low-cost thick-gauge hot-rolled dual-phase steel plate with uniform structure and a manufacturing method

Method used

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  • Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof
  • Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof
  • Thick-specification hot-rolled dual-phase steel plate and manufacturing method thereof

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Embodiment Construction

[0027] The following are specific examples of the present invention, which are used to explain the present invention, but not to limit the scope of the present invention.

[0028] The low-cost hot-rolled dual-phase steel plate with thick gauge and uniform structure based on the post-mounted ultra-fast cooling technology of the present invention is smelted and cast into slabs according to the set composition. 0.50%Si, 1.20~1.50%Mn, Cr≤0.40%, P≤0.012%, S≤0.002%, the balance is Fe and unavoidable impurities.

[0029] Table 1 is the measured chemical composition of specific examples of the present invention (by weight percentage, the balance is Fe and unavoidable impurities).

[0030] Table 1 Chemical composition of specific embodiments of the present invention (Wt.%)

[0031]

[0032] Example process: put the billet of the composition shown in Examples 1 to 4 in a heating furnace and heat it to 1160~1240 ° C, and adopt rolling including austenite recrystallization zone (reduc...

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Abstract

The invention discloses a low-cost thick-specification uniform-structure hot-rolled dual-phase steel plate based on a post ultra-fast cooling technique and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.055-0.085% of C, 0.20-0.50% of Si, 1.20-1.50% of Mn, at most 0.40% of Cr, at most 0.012% of P, at most 0.002% of S, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: (1) heating a casting blank, and carrying out controlled rolling; (2) after hot rolling, cooling to a ferrite phase-change zone in a forepart centralized laminar cooling mode; and (3) cooling to martensitic phase-change temperature below by using a post ultra-fast cooling system, and coiling. The production mode, which uses the post ultra-fast cooling technique as the core, is utilized to lower the dependence of the thick-specification high-strength hot-rolled dual-phase steel on alloy elements; and the thick-specification high-strength hot-rolled dual-phase steel has the advantages of cheap components, uniform structure and excellent and stable performance, and is suitable for mass industrial production.

Description

technical field [0001] The invention relates to the fields of metallurgical technology and steel rolling technology, in particular to a low-cost hot-rolled dual-phase steel plate with uniform thickness and thickness and a manufacturing method based on post-mounted ultra-fast cooling technology. Background technique [0002] With the increasingly stringent requirements for energy saving, environmental protection and safety, the research on automobile lightweight is progressing rapidly. The consumption of high-strength steel and advanced high-strength steel is growing rapidly. Due to its low yield ratio, high initial work hardening rate, and good strength-plastic matching, dual-phase steel is one of the most widely used advanced high-strength steels. [0003] Hot-rolled dual-phase steel mainly obtains a dual-phase structure with a certain volume fraction and morphology of martensite distributed on the ferrite matrix through the matching of chemical composition and rolling pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/04C21D8/02
Inventor 袁国利成宁康健李振垒王国栋
Owner NORTHEASTERN UNIV
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