The manufacturing method of high-strength plate q960 produced by the steel coil rolling mill

Abstract

The invention discloses a method for manufacturing high-strength plate Q960 produced by a coil rolling mill. In terms of smelting technology, converter steelmaking is adopted, and top-lower compound blowing is used for deep decarburization; RH vacuum treatment is used for further decarburization and microalloying. Obtain a steel billet that meets the requirements; the chemical composition weight percentage of the steel billet is: C0.12~0.20%, Mn0.80~1.60%, Si0.02~0.40, P≤0.015, S≤0.005, B0.001~0.003, and add Appropriate amount of Cr, Mo, V, Ni alloy elements, and satisfy carbon equivalent Ceq=+Mn / 6+Cr / 5+Mo / 4+V / 14+Ni / 40+Si / 24≤0.60; in terms of rolling process , controlled rolling is carried out by a steckel rolling mill, and the heating temperature of the steel billet before rolling is 1150-1250 °C; the invention has the characteristics of low carbon equivalent, excellent low-temperature toughness, smooth plate shape, and good welding performance, and is suitable for construction machinery, mining equipment, ports, etc. Machinery and other fields.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a production technology for welding high-strength low-temperature steel, in particular a method for producing high-strength plate Q960 by a steckel rolling mill. Background technique [0002] In order to improve efficiency, reduce self-weight and reduce energy consumption, the application and demand of high-strength steel plates with yield strength above 960MPa in advanced manufacturing industries such as construction machinery are becoming more and more extensive and urgent. The WELDOX series of weldable high-strength steel plates for engineering structures produced by SSAB in Sweden has a maximum yield strength of 1300MPa, and this series of products accounts for about 60% of the international market. Domestic high-strength steel for weldable engineering structures above 800MPa basically relies on imports. Studies have shown that the structures that can meet the stre...

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Problems solved by technology

[0003] Aiming at the problem that the high-strength plate Q960 has not been produced by the use of the steel-steel rolling mill at present, the purpose of the present invention is to provide a manufacturing method for the production of the high-strength steel plate Q960 by the steel-steel rolling mill. The high-strength E-grade steel plate with a yield strength of 960MPa can still maintain high impact toughness at -40°C. The product can meet the requirements of high strength, high toughness, and easy welding in construction machinery, mining equipment, and port machinery. , Long life requirements, especially the 5~8MM thick thin gauge high-strength plate has excellent shape, good forming, and high economic benefits

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