Steel plate applied to extremely low temperature environment

Abstract

The invention discloses a steel plate applied to an extremely low temperature environment. The steel comprises the following chemical components in percentage by weight: 0.03 to 0.05% of C, 0.10 to 0.30% of Si, 1.60 to 1.80% of Mn, 0.010 to 0.030% of Ti, 0.2 to 0.4% of Nb, 0.8 to 1.2% of Cr, 1.3 to 1.5% of Ni, 0.03 to 0.05% of N, not greater than 0.008% of S, not greater than 0.005% of P, and the balance of Fe and inevitable impurities.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a steel plate used in an extremely low temperature environment. 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 are getting higher and higher, from the national standard requirements...

AI Technical Summary

Problems solved by technology

Although it has been improved compared with the existing technology, its strength, toughness and impact energy still cannot meet the use requirements of some extremely low temperature occasions, so it is still necessary to improve