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AssigneeKawasaki Steel Corporation
InventorsKenji Ito, Isao Takahashi, Yo Ito, Takuo Imai, Fumio Kosumi, Hideo Kuguminato
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Steel sheets having an excellent enamelability are produced by adjusting the carbon, silicon, manganese, aluminum, oxygen and boron contents in a molten steel to be not more than 0.020% of carbon, not more than 0.03% of silicon, not more than 0.50% of manganese, not more than 0.010% of aluminum, nor more than 0.050% of oxygen, boron within a range of 0.003-0.020% being in such an amount B(%).times.0(%) of more than 1.times.10.sup..sup.-5 and the remainder being inevitable impurities and iron, and hot rolling the resulting steel, cold rolling the steel and subjecting to a recrystallization annealing in a conventional manner.
A method for producing cold rolled steel sheets having an excellent enamelability which comprises adding to a molten steel containing not more than 0.020% of carbon, not more than 0.03% of silicon, not more than 0.50% of manganese, not more than 0.01% of aluminum, not more than 0.050% of oxygen, and having a nitrogen content of less than 0.01%, and the remainder being inevitable impurities and iron, boron within a range of 0.005-0.020% being in such amounts of B(%).times.O(%) of more than 1.times.10.sup.-.sup.5 and hot rolling the resulting steel, cold rolling the steel, and subjecting to a recrystallization annealing under a decarburization atmosphere.
Dependencies are inferred from the claim text.