A method for smelting titanium-containing austenitic stainless steel plate

Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a method for smelting a titaniferous austenitic stainless steel plate; and by means of the method, the defect that the surface of the titaniferous austenitic stainless steel plate has foreign matter is overcome. The technology includes the processes of electric furnace smelting, AOD furnace decarbonization, denitrifying and reduction and deoxygenation, LF furnace deoxygenation, calcium treatment, slagging off, titanium alloying, composition fine-adjustment and temperature adjusting, weak blowing and sedation and casting protection. By means of the method, carbon and nitrogen are lowered to a certain degree through AOD refining, reduction is conducted till deoxygenation is completed, and nitrogen increase and oxygen increase in the tapping process are controlled; the deoxygenation process is used when a LF furnace draws up at a station, increased oxygen in the AOD tapping process is removed effectively, and the yield of steel is increased and stabilized, generation of oxide of titan in steel is lowered as well; calcium treatment is adopted after deoxygenation, and a deoxygenation product is modified, comes up and is removed; the stirring intensity needs to be controlled in the whole LF operation process, and molten steel nitrogen increase and secondary oxidation are prevented; and meanwhile, the alkalinity of slag and the SiO2 content in the slag are controlled, the weak blowing time is prolonged, the sedation time is prolonged, rejects generated in production are lowered effectively, cost is lowered, and the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting titanium-containing austenitic stainless steel plates. Background technique [0002] The surface inclusion defect of titanium-containing austenitic stainless steel 321 in the production is the most prominent quality problem that plagues various production plants. More than 5%, the incidence rate of some manufacturers is as high as more than 20%, and the incidence rate of our initial production has reached 17-40%, which seriously affects the quality of the product. It is scrapped because the user cannot use it, which greatly increases the production cost and reduces the product cost. profitability. Contents of the invention [0003] The purpose of the present invention is to provide a method to avoid surface inclusion defects in titanium-containing austenitic stainless steel 321 during production, strictly control the reduction and tapping p...

AI Technical Summary

Problems solved by technology

[0002] The surface inclusion defect of titanium-containing austenitic stainless steel 321 in the production is the most prominent quality problem that plagues various production plants. More than 5%, the incidence rate of some manufacturers is as high as more than 20%, and the incidence rate of our production has reached 17-40%, which seriously affects the quality of the product. It is scrapped because the user cannot use it, which greatly increases the production cost and reduces the product cost. Profitability