Continuous casting production method of sulfur-containing and aluminum-containing high calcium steel

Abstract

The invention discloses a continuous casting production method of sulfur-containing and aluminum-containing high calcium steel. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel includes working procedures of converter smelting, LF (ladle furnace) ladle refining, VD (vacuum distillation) vacuum refining and continuous casting. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel uses high alkalinity refining slags in the earlier stage of the LF ladle refining process, thereby facilitating deoxygenation and desulfurization, and absorbing inclusions in steel liquid, and then reduces alkalinity of the refining slags in the middle and later stages, thereby inhibiting generation ofCaS, and improving the yield of Ca; and performs wire feeding process alloying and soft blow after vacuum breaking of the VD vacuum refining, achieves even steel liquid constituents and temperature for the steel liquid, facilitates upward floating of the inclusions in the steel liquid, improves purity of the steel liquid, achieves the upward floating of the inclusions in the steel liquid throughstanding, and further improves the purity of the steel liquid. The continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel reduces occurrence rate of anozzle clogging problem in the continuous casting process of the sulfur-containing and aluminum-containing high calcium steel, and compared with a current traditional mold casting process, the continuous casting production method of the sulfur-containing and aluminum-containing high calcium steel can substantially improve production efficiency of the sulfur-containing and aluminum-containing highcalcium steel, and substantially reduces production cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous casting production method of sulfur-containing aluminum-containing high-calcium steel. Background technique [0002] Gear steel is one of the key materials with high requirements in special alloy steel used in automobiles, railways, ships, and construction machinery, and is the manufacturing material for core components that ensure safety. Among them, sulfur-containing aluminum-containing high-calcium steel is used as a material for processing gears due to its good grain size and easy machinability, which can meet the processing performance of gears. [0003] Sulfur-containing aluminum-containing high-calcium steel usually has S≥0.020%, Al≥0.015%, and Ca≥0.0020%, among which Al can improve the grain size, and S and Ca can be combined to improve machinability. And because this steel type is very prone to clogging the nozzle during continuous casting, r...

AI Technical Summary

Problems solved by technology

However, since this type of steel is very prone to clogging the nozzle during continuous casting and causing a pouring stop accident, it has been tested that most of the nozzle blockages are CaS

However, there is no stable continuous casting production process in the prior art, so the smelting of sulfur-containing aluminum-containing high-calcium steel is mostly formed by die-casting, which reduces production efficiency and increases costs