Secondary refining production method of super-clean high-carbon chromium bearing steel
A technology of ultra-pure high-carbon chromium bearings and high-carbon chromium bearing steel, which is applied in the production field of ultra-high-quality bearing steel, can solve the problems of low production efficiency, low steel purity level, high production cost, etc., and prevent molten steel from oxidation Effect
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[0030] Below in conjunction with embodiment the present invention is described in further detail.
[0031] According to the chemical composition range designed for high-carbon chromium bearing steel, see Table 1, after 100 tons of molten iron pretreatment KR → 100 tons of converter BOF → slag removal RS → 100 tons of refining furnace LF → 100 tons of vacuum degassing furnace RH → large section Continuous casting machine CC→rolling produced 10 furnaces and 8 specifications of the steel of the present invention.
[0032] (1) The ladle, continuous casting tundish and molten steel are made of high refractoriness materials with magnesium content (≥90%), aluminum alloy is used as a deoxidizer, and special slag is used: containing 40-60% CaO, 3-10 %MgO, 3~10%SiO 2 , 20-40%Al 2 o 3 special refining slag, and control the free CaO mole fraction in the refining slag to 40% to 60%;
[0033] (2) The pretreatment of molten iron adopts mechanical agitation and adopts the "one stirring an...
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