Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel

A complex phase steel and process technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of high production cost, not higher than 20%, and limit the wide application of second-generation automotive steel, and achieve improved performance. The effect of elongation
CN103160680AInactive Publication Date: 2013-06-19UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2013-06-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel, and belongs to the field of metal heat treatment. In the method, a chill plate made from low-carbon silicon-manganese-series ingredient steel is used as a raw material. The Q-and-PB heat treatment method comprises the following steps of: firstly, heating the steel plate to a temperature of greater than Ac3 and insulating heat for 2 minutes, and quenching to a temperature T1 which is between Ms and Mf; secondly, placing a test sample in a place at a temperature T2 which is greater than the temperature Ms and insulating heat for 30-600 seconds; and finally, quenching to a room temperature. Experiments prove that the low-carbon silicon-manganese-series steel prepared by the method disclosed by the invention is extremely high in strength and elongation, and the product of strength and elongation of the low-carbon silicon-manganese-series steel achieves more than 30 GPa%.
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Description

[0001] The invention belongs to the field of heat treatment of metal materials, and is an economical heat treatment process for 30GPa·% ultra-high-strength multi-phase steel. Background technique

[0002] As people's awareness of automobile safety and environmental protection increases, the development of "environmentally friendly automobiles" is the development trend of the automobile industry. In order to simultaneously improve safety performance and save energy and reduce emissions, it is necessary to increase the proportion of ultra-high-strength automotive steel used in the body. Studies have shown that by using ultra-high-strength automotive steel to reduce the weight of the car body by 10%, fuel consumption can be saved by 3% to 7%. The first generation of high-strength steel for automobiles is mainly DP steel, TRIP steel, martensitic steel, etc., the structure is mainly ferrite and martensite, and the strength can reach 1000MPa, but the elongation is generally not high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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