Cold rolled dual-phase sheet steel with 1000MPa grade tensile strength and preparation method thereof

A technology for tensile strength and steel plates, which is applied in the field of cold-rolled ferrite/martensitic dual-phase steel plates for automobiles, can solve the problems of decreased elongation, poor stamping and formability of steel plates, etc., and achieves yield elongation avoidance, The effect of high tensile strength and low yield ratio

Inactive Publication Date: 2009-02-11
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the increase in strength will inevitably lead to the decrease of elongation, the stamping and formability of the steel plate will be deteriorated. Therefore, the goal of the application technology of the automobile plate is to develop a steel plate with high strength and excellent plasticity.

Method used

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  • Cold rolled dual-phase sheet steel with 1000MPa grade tensile strength and preparation method thereof
  • Cold rolled dual-phase sheet steel with 1000MPa grade tensile strength and preparation method thereof

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Embodiment Construction

[0018] The chemical compositions of the examples of the present invention are shown in Table 1. After smelting, the cast billets are forged into billets with a size of 40 mm (thickness) × 80 mm (width) × 100 mm (length). After forging, the billet was soaked at 1250 °C for 1 hour, hot rolled into a 3.5mm thick steel plate, the final rolling temperature was controlled at 830 °C, water cooled to 650 °C, placed in a holding furnace for heat preservation and then cooled with the furnace to simulate the coiling process. The hot-rolled sheet is cold-rolled to 1mm after pickling, and the cold-rolling reduction rate is about 70%. The continuous annealing of dual-phase steel generally adopts dual-phase zone heat preservation and two-stage cooling process, such as figure 1 shown.

[0019] holding the cold-rolled steel sheet at 780 and 820° C. for 100 s;

[0020] After slow cooling to 680°C, the cold-rolled steel sheet is cooled to 280°C at a cooling rate greater than 45°C / s, the cold-r...

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Abstract

A cold-rolled biphase steel plate with 1000 MPa of tensile strength and a production method thereof belong to the technical field of high-intensity cold-rolled biphase steel. The steel plate comprises the following chemical components by mass percentages: 0.14%-0.21% of C, 0.40%-0.90% of Si, 1.5%-2.1% of Mn, 0.01%-0.05% of Nb, less than 0.02% of P, less than 0.01% of S, and Fe and inevitable impurities. The production method is as follows: a billet is treated by the conventional hot rolling, pickling, cold rolling and continuous annealing, the annealing temperature is 760-820 DEG C and is kept for 70-120s, the fast cooling speed is 40-50 DEG C per second, the aging temperature is 240-320 DEG C and the aging time is 180-300s. The cold-rolled biphase steel plate has the advantages of high tensile strength, low tensile ratio, high initial work hardening rate, no yield elongation which avoids wrinkles on the formed parts. The cold-rolled biphase steel plate has a biphase organization with fine grain ferrite and martensite, wherein, the volume fraction of the martensite is 30%-40% and the average grain size of the ferrite is 2mum.

Description

technical field [0001] The invention belongs to the technical field of dual-phase steel, and in particular provides a cold-rolled dual-phase steel plate with a tensile strength of 1000 MPa and a preparation method thereof. Mainly used for automotive structural parts and crash parts. Background technique [0002] The development trend of a new generation of automobiles is energy saving, consumption reduction, environmental protection and safety. Therefore, the application of high-strength and ultra-high-strength steel in automobiles is the goal of future development, so as to achieve the purpose of lightening and safety of automobiles. [0003] Since the increase in strength will inevitably lead to a decrease in elongation, the stampability and formability of the steel plate will be deteriorated. Therefore, the goal of automotive sheet application technology is to develop a steel sheet with high strength and excellent plasticity. The strength and plasticity matching of advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02C21D1/26
Inventor 陈雨来李本海赵征志朱立新徐刚朱国森陈银莉薛俊平苏岚郑天然赵爱民周建孙蓟泉唐荻
Owner UNIV OF SCI & TECH BEIJING
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