A Refining Argon Blowing Method Applied to SPHC Steel

Abstract

The invention discloses a refining argon blowing method applied to an SPHC steel grade. The method comprises the flowing steps that (1) ferro-manganese-aluminum is used for deoxidizing when steel is sent out from a converter, and after the steel is sent out, molten steel temperature of a steel ladle is controlled to range from 1600 DEG C to 1620 DEG C; (2) after the steel ladle enters a station, argon is pumped, stirring is conducted for 2-2.5 min, the pressure of the argon ranges from 0.8 MPa to 1.2 MPa, then the pressure of the argon is adjusted to range from 0.2 MPa to 0.4 MPa to measure temperature and determine oxygen, feeding aluminum wire alloying is conducted according to measured aluminum content, and the aluminum content is controlled to range from 0.04% to 0.05%; (3) after the feeding aluminum wire alloying is finished, argon stirring is conducted for 2-3 min, and the pressure of the argon ranges from 0.8 MPa to 1.2 MPa; after stirring, the argon is closed, and the steel ladle stands for 5-5.5 min; after the steel ladle stands, the argon is stirred for 1-2 min under the condition that the pressure of the argon ranges from 0.8 MPa to 1.2 MPa, then the pressure of the argon is adjusted to range from 0.2 MPa to 0.4 MPa, sampling is conducted, and feeding calcium wire soft blow is conducted; (4) after soft blow, continuous casting is conducted. By means of the refining argon blowing method applied to the SPHC steel grade, the problem that recarburization, silicon increasing and the like are likely to happen in the process of refining is effectively solved, the smelting cost such as power consumption and slag charge consumption of the LF refining process is lowered, the fluidity of the molten steel is normal, and quality requirements of users are completely met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking. Specifically, the invention relates to a refining argon blowing method applied to SPHC steel grades. Background technique [0002] SPHC steel belongs to low-carbon, low-silicon, aluminum-killed steel. The market demand has always been great. Many steel mills at home and abroad are producing it. It is used as deep-processing materials such as stamping and panel forming, such as housings for home appliances and instruments. Therefore, SPHC steel grades are required to have higher stamping performance, and stricter requirements on surface quality and composition. Most of the SPHC steel production enterprises in my country adopt the LF refining process, but this process has problems such as easy increase of carbon and silicon during the refining process, and the cost is high. Therefore, the method of SPHC blowing argon straight up is developed to solve such problems....

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a refining argon blowing method applied to SPHC steel grades, which effectively solves the problems of easy carburization and silicon increase in the refining process, and reduces the power consumption and slag material in the LF refining process. Consumption and other smelting costs, the fluidity of molten steel is normal, fully meeting the quality requirements of users