发明名称 PROCESS FOR PRODUCING HIGH-NITROGEN ULTRALOW-CARBON STEEL
摘要 <p>A process by which a high-nitrogen ultralow-carbon steel which upon aging treatment after working/forming has excellent age-hardenability and which is suitable for use as a material for cold-rolled steel plates or sheets can be highly efficiently produced without fail at low cost without causing defects in slabs or steel plates or sheets. The process, which is for producing a rolling material for ultralow-carbon steel plates or sheets having a carbon content of 0.0050 mass% or lower, comprises: subjecting a hot metal from a blast furnace to primary decarburization/refining; regulating the molten steel which has undergone the primary decarburization/refining so as to satisfy the following relationship; [mass% N] - 0.15 [mass% C] ≥ 0.0060 subjecting it to secondary decarburization/refining with a vacuum degassing apparatus until the carbon concentration reaches an ultralow-concentration region while inhibiting denitrification; subsequently deoxidizing the molten steel with aluminum; regulating the contents of aluminum and nitrogen so as to satisfy the relationships [mass% Al] [mass% N] ≤ 0.0004 and 0.0050 ≤ N ≤ 0.0250 mass% and preferably result in a content of solid-solution nitrogen not lower than a given value; and continuously casting the molten steel obtained.</p>
申请公布号 WO2002048409(P1) 申请公布日期 2002.06.20
申请号 JP2001010876 申请日期 2001.12.12
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