TRIP steel sheet for high strength cold rolled continuous annealing and preparation method thereof

A high-strength, steel plate technology, applied in the field of high-strength cold-rolled steel, can solve the problems of not much and less TRIP steel

Inactive Publication Date: 2009-02-11
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] There are relatively few domestic research reports on TRIP steel, most of which are in the laboratory stage, and there are not many researches on system and large-scale production experiments.

Method used

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  • TRIP steel sheet for high strength cold rolled continuous annealing and preparation method thereof

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Embodiment

[0027] The manufacture method of 1000MPa level cold rolling continuous annealing TRIP steel of the present invention:

[0028] Firstly, the smelting is carried out according to the design composition. After the billet is forged, it is hot-rolled into a thin plate. The finishing temperature of hot rolling is 860°C, and the coiling temperature is 650°C; The phase zone annealing time is 120s or 180s, the cooling rate CR1 from the annealing temperature to the isothermal temperature is greater than 20°C / s; the isothermal temperatures are 380, 420 and 460°C, the isothermal time is 240s, and the cooling rate CR2 after isothermal is greater than 20 °C / s to cool to room temperature, so as to obtain 1000MPa grade cold-rolled TRIP steel for continuous annealing. figure 1 For the annealing process, Table 1 is the chemical composition, and Table 2 is the mechanical properties.

[0029] Table 1 chemical composition

[0030] C Si mn P S Cu Ni Nb Ti 0.24 1.40 1....

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Abstract

A high-strength and cold-rolled TRIP steel plate for continuous annealing and a preparation method thereof belong to the technical field of high-strength cold rolled steel. The components of the steel plate are as follows according to mass percentages: 0.1-0.4% of C, 0.5-2.5% of Si, 0.5-2.5% of Mn, 0.01-0.10% of Nb, 0.01-0.10% of Ti, 0.1-1.0% of Cu, 0.1-1.0% of Ni, not more than 0.03% of P, not more than 0.02% of S, and Fe. The steel plate has the advantages of superior workability and surface properties, the mechanical properties of the steel plate are improved by adding Nb, Ti, Cu, Ni, and the like, which provides the plate with the combination of high tensile strength and high specific elongation.

Description

technical field [0001] The invention relates to the technical field of high-strength cold-rolled steel, and in particular provides a TRIP (TRIP is an abbreviation for transformation-induced plasticity) steel plate for high-strength cold-rolled continuous annealing and a preparation method thereof. Background technique [0002] For a long time, steel materials have been the main materials used in the automobile industry. Although the proportion of steel materials has declined with the decline in vehicle weight in recent years, it still maintains a dominant position. The threat of the appearance of aluminum, magnesium and plastic automobiles to the steel industry is obvious. For this reason, 35 steel companies in 18 countries around the world have cooperated in the research project of ultra-light steel body (ULSAB) to meet the challenges of aluminum and magnesium. . Its main feature is the extensive use of high-strength steel (HSS) and ultra-high-strength steel (UHSS, AHSS), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/28C21D8/02
Inventor 米振莉李本海张宇光朱立新赵征志刘光明陈银莉熊爱明苏岚赵爱民孙蓟泉唐荻周建
Owner UNIV OF SCI & TECH BEIJING
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