Process Development and Quality Control of Chalcogenide Free-cutting Steel
Converter smelting uses micro carbon manganese iron and sulfur iron for alloying,and ferrosilicon and high aluminum manganese iron for deoxidation control.After furnace refining,the slag alkalinity is controlled to be≥1.6,the free oxygen content(mass fraction)in the molten steel is controlled to be≤0.006 0％,and the w(S)control range is 0.30％～0.35％.Continuous casting is fully water-cooled for production,and the casting is protected throughout the process.Crystallizer electromagnetic stirring and end electromagnetic electric stirring processes are used.The rolling process heats up the furnace at a temperature of ≥ 1 180 ℃,the wire feeding temperature is≤900 ℃,the grain size is 9±0.5 level,the steel cutting material is C-shaped,the cutting performance is good,and the surface smoothness of the processed product is good,meeting the needs of downstream customers.
slag alkalinityfull water coolingfree cutting steelspinning temperaturecutting material
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