A smelting process of gear steel containing aluminum and sulfur
A gear steel and process technology, applied in the field of metallurgy, can solve the problems of easily exceeding the standard of oxygen content and non-metallic oxygen content of steel, inability to achieve continuous casting of multiple furnaces, affecting the quality of molten steel and scrapping, etc., so as to reduce harmful residual elements and prevent nozzle formation. tumor, ensure the effect of antegrade
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[0024] A smelting process of gear steels containing aluminum and sulfur, taking the production of 20MnCrS5 gear steel as an example to illustrate:
[0025] Production process: blast furnace molten iron (90%) + scrap steel (10%) - 100 tons of electric furnace - 100 tons of ladle refining furnace (LF) - 100 tons of vacuum furnace (VD) - 5 machines and 5 strands of continuous casting machine (220mm × 260mm rectangular billet ).
[0026] Electric furnace smelting process
[0027] 1. The electric furnace adopts blast furnace molten iron + scrap steel. The hot charging ratio of molten iron accounts for 90%. The carbon content at the end of the electric furnace is controlled above 0.06%. 2 o 3 Such inclusions can effectively control the oxygen content and inclusion content in steel.
[0028] 2. Add 600kg of lime and 400kg of low-Si refining agent to the electric furnace tapping until the Si content in the refining furnace is less than 0.03%.
[0029] 3. When tapping, add 100 kg o...
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