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Fire resistant steel excellent in high temperature strength, toughness, and reheating embrittlement resistance and process for production of the same
Fire resistant steel excellent in high temperature strength, toughness, and reheating embrittlement resistance and process for production of the same
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机译:耐高温强度,韧性和抗再热脆性优异的耐火钢及其生产方法
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摘要
The present invention provides a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance containing, by mass %, C: 0.001% to 0.030%, Si: 0.05% to 0.50%, Mn: 0.4% to 2.0%, Nb: 0.03% to 0.50%, Ti: 0.005% to less than 0.040%, N: 0.0001% to less than 0.0050%, and Al: 0.005% to 0.030%, limiting P: 0.03% or, less and S: 0.02% or less, satisfying C—Nb/7.74≦0.005 and 2≦Ti/N≦12, and having a balance of Fe and unavoidable impurities and, further, a process for production of a fire resistant material comprising heating a steel slab comprised of this chemical composition to 1100 to 1350° C. and hot rolling it by a cumulative reduction rate at 1000° C. or less of 30% or more.
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