A method for improving performance of tin-containing carbon structural steel

Abstract

The invention relates to a method for improving performance of tin-containing carbon structural steel, and belongs to the field of ferrous metallurgy. The tin-containing carbon structural steel is basic carbon structural steel containing the residual tin element. The method comprises the steps that in the smelting refining period of the basic carbon structural steel, a source S and a source T are added, and modified carbon structural steel is obtained, wherein the amount of the source S added in the smelting refining period of the basic carbon structural steel and the amount of the source Ti added in the smelting refining period of the basic carbon structural steel are calculated in the manner that calculation is carried out according to the element S in the source S, the weight percentage of the added element S is 0.01-0.03%, and the weight percentage of the added source Ti is 0.02-0.04%. The source S added in the smelting refining period of the basic carbon structural steel is FeS, and the source Ti added in the smelting refining period of the basic carbon structural steel is titanium sponge. By means of the method, thermoplasticity and normal / low temperature impact tenacity of the carbon structural steel can be obviously improved, and therefore the requirement of the carbon structural steel for the content of the residual element tin in steelmaking raw materials is lowered, the production cost is reduced, and the economic benefits are increased.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and mainly relates to a method for improving the performance of carbon structural steel containing tin. Background technique [0002] According to the statistics of the World Iron and Steel Association, the global crude steel output reached 1.662 billion tons in 2014, of which China's crude steel output reached 822.7 million tons, a slight increase of 0.9% year-on-year. With the continuous increase of my country's steel production, on the one hand, the demand for iron ore continues to increase, leading to the gradual depletion of high-quality iron ore resources, and the increase in the use of various low-grade iron ore resources; Usage is increasing year by year. [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 r...

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Problems solved by technology

Moreover, as the level of residual elements in the scrap steel cycle is getting higher and higher, the residual element Sn 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 Sn 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 Sn will deteriorate the thermoplasticity of the steel, resulting in cracks and surface defects in the continuous casting and rolling process.