Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet
A production method and easy-cutting technology, which is applied in the field of continuous casting of low-carbon and high-sulfur (sulfur-phosphorus) free-cutting structural steel continuous casting billets, can solve the problems of inability to compete in the imported material market, high production costs of free-cutting structural steel, etc. , to achieve the effect of strong versatility of equipment and process, high billet rate and low production cost
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[0026] The steelmaking branch of a steel company implements the patent of the invention, and the production cross-section size is 90×90mm 2 ~360×360mm 2 Low-carbon high-sulfur (sulfur-phosphorus) free-cutting structural steel continuous casting billets (structural steel varieties: American grades 1108, 1109, 1110, 1116, 1117, 1118, 1119, 1211, 1212, 1213, 1215, Japanese grades SUM11 . 2 1213, 1215 structural steel as an example) thousands of tons, the process flow is: 60 tons (30-100 tons) electric furnace primary refining; 60 tons (corresponding tonnage) bottom blowing argon ladle furnace refining; 3 machines, 3 streams 160× 160mm 2 Continuous casting machine pouring. The first step is to carry out the initial smelting of molten steel in a 60T electric furnace: pass in electric current and input oxygen to melt the loaded charge into molten steel in the temperature range of 1640-1660°C; (End point oxygen content) control 700ppm; EBT r...
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