A method for improving the properties of carbon structural steel containing residual element antimony

Abstract

The invention provides a method for improving the performance of carbon structural steel containing residual antimony. According to the method, S with the weight percentage being 0.01-0.03% and Ti with the weight percentage being 0.02-0.04% are added into the steel, wherein the steel is composed of, by weight, 0.13-0.19% of C, 0.20-0.40% of Si, 1.20-1.60% of Mn, P smaller than or equal to 0.01%, S smaller than or equal to 0.01%, Al smaller than or equal to 0.005%, 0.03-0.13% of Sb and the balance Fe; damage of the residual Sb to the thermoplasticity and the impact performance of 16Mn steel can be lowered, the thermoplasticity and the impact toughness at normal temperature and low temperature of the 16Mn steel containing the Sb can be improved, the product quality and the production efficiency can be effectively improved, and the production cost can be lowered.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for improving the performance of carbon structural steel containing residual antimony. Background technique [0002] The residual element antimony is recognized as a harmful element in steel. Except a small amount of antimony in special steels such as silicon-containing electrical steel and free-cutting steel can improve the electromagnetic properties of non-oriented silicon steel products and the cutting performance of free-cutting steel. Antimony is not allowed. [0003] With the increasing utilization of low-grade iron ore and steel scrap in steelmaking production, residual elements such as tin, antimony, and arsenic are continuously enriched in steel. Because the oxygen potential of residual elements is lower than that of iron, the residual elements entering molten steel are difficult to remove under the current steelmaking process conditions. W...

AI Technical Summary

Problems solved by technology

However, as the level of residual elements in the scrap steel cycle becomes higher and higher, the residual element Sb is easy to segregate at the grain boundary, which reduces the surface energy of the grain boundary and weakens the bonding force between grains. When the residual element Sb content in 16Mn steel exceeds 0.02% (weight percentage) will significantly deteriorate the thermoplasticity and normal / low temperature impact toughness of 16Mn steel, and the residual element Sb will deteriorate the thermoplasticity of the steel, resulting in cracks and surface defects in the continuous casting and rolling process.