Method for manufacturing high-strength steel plate used in low-temperature environment

Abstract

The invention relates to a method for manufacturing a high-strength steel plate used in low-temperature environment. The steel plate comprises the following chemical components in percentage by weight: 0.06-0.10 percent of C, 0.10-0.40 percent of Si, 0.9-1.40 percent of Mn, 0.010-0.030 percent of Ti, 0.01-0.06 percent of V, 0.0-0.40 percent of Cr, 0.10-0.30 percent of Ni, 0.10-0.30 percent of Mo and the balance of Fe; the equivalent weight of the component carbon is required to be smaller than or equal to 0.45 percent, and the thickness specification of the produced steel plate ranges from 10mm to 60mm. The performance control is carried out by adopting a rolling and cooling control and heat treatment technology; the method has the advantage that the comprehensive mechanical performance of the produced steel plate is greatly improved than that of a steel plate in the same grade; the thickness is between 10mm and 60mm, the yield strength can stably reach not smaller than 490MPa, the tensile strength can stably reach 60kg grade, a low-temperature impact power average value at minus 60 DEG C stably reaches not smaller than 100J, and the high-performance requirement on the steel plate in the low-temperature environment of minus 60 DEG C can be fully met.

Description

technical field [0001] The invention relates to a manufacturing method of a high-strength steel plate used in a low-temperature environment, which adopts controlled rolling, controlled cooling and heat treatment processes for performance control. Background technique [0002] At present, there are few types of high-strength steel plates used in low-temperature environments in China, and most of them are limited to low-temperature containers. In other low-temperature environments, high-strength steel plates with excellent performance that can be used in low-temperature environments are also required. There are three difficulties in the research and development of domestic steel plates for low temperature use. First, the ambient temperature of steel plates is getting lower and lower, from -20°C to -60°C; second, the strength of steel plates is getting higher and higher, and the tensile strength has increased from 40Kg to 60Kg level; third, the impact toughness requirements ar...

AI Technical Summary

Problems solved by technology

There are three difficulties in the research and development of domestic steel plates for low temperature use. First, the ambient temperature of steel plates is getting lower and lower, from -20°C to -60°C; second, the strength of steel plates is getting higher and higher, and the tensile strength has increased from 40Kg to 60Kg level; third, the impact toughness requirements are getting higher and higher, from the national standard requirements to the mutual consultation between users and manufacturers, and the requirements for low-temperature impact energy values ​​are increased

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