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AssigneeNippon Steel Corporation
InventorsSuguru Yoshida, Kita Hiroshi, Hirokazu Sugiyama, Yoshiyuki Watanabe, Yasushi Hasegawa
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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.
A fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance characterized by containing, by mass %,
A process for production of a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance characterized by heating a steel slab having the ingredients described in any one of claims 1 and 2 to 1100 to 1350° C. and hot rolling it by a cumulative reduction rate of 30% or more at 1000° C. or less.
A process for production of a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance characterized by heating a steel slab having the ingredients described in any one of claims 1 and 2 to 1100 to 1350° C. and using a universal rolling mill train to hot roll it by a cumulative reduction rate of 30% or more at 1000° C. or less to obtain a steel material having a cross-section shape of an H-shape comprised of integrally formed flanges and a web.
Dependencies are inferred from the claim text.