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HIGH-STRENGTH STEEL PLATE WITH 980 MPa OR ABOVE TENSILE STRENGTH EXCELLENT IN LOW TEMPERATURE TOUGHNESS OF MULTI-LAYER JOINT
HIGH-STRENGTH STEEL PLATE WITH 980 MPa OR ABOVE TENSILE STRENGTH EXCELLENT IN LOW TEMPERATURE TOUGHNESS OF MULTI-LAYER JOINT
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机译:多层接头的低温韧性优异的980 MPa或更高的抗拉强度的高强度钢板
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摘要
PROBLEM TO BE SOLVED: To provide a high strength steel sheet which is excellent in low temperature toughness at the HAZ of a joint portion even while having the tensile strength of 980 MPa or more.SOLUTION: The steel sheet contains 0.12-0.16% (meaning mass%, and the same hereinafter) of C, 0.05-0.5% of Si, 0.8-1.2% of Mn, 0.01-0.07% of Al, 0.5-0.8% of Mo, 0.025-0.08% of Nb, 0.0004-0.002% of B, and 0.8% or less of Cr and/or 0.06% or less of V, respectively, and the balance comprising iron and inevitable impurities. An MP value specified by equation (1) is 0.550 or larger, and a carbon equivalent Ceq specified by equation (2) is 0.63% or less, wherein equation (1) : MP value=(12/[C])×(([Mo]/96)+([Nb]/93)) and equation (2): Ceq=[C]+[Mn]/6+([Cr]+[Mo]+[V])/5+([Cu]+[Ni])/15.
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