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ULTRAHIGH-STRENGTH HOT-ROLLED STEEL SHEET AND STEEL STRIP HAVING GOOD FATIGUE AND REAMING PROPERTIES AND MANUFACTURING METHOD THEREFOR
ULTRAHIGH-STRENGTH HOT-ROLLED STEEL SHEET AND STEEL STRIP HAVING GOOD FATIGUE AND REAMING PROPERTIES AND MANUFACTURING METHOD THEREFOR
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机译:超高强度热轧钢板和钢筋,具有良好的疲劳和铰孔性能和制造方法
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摘要
An ultra-high-strength hot-rolled steel plate and steel strip having good fatigue and reaming properties and a manufacturing method therefor. The weight percentages of the components of the steel plate and the steel strip are: C: 0.07-0.14%, Si: 0.1-0.4%, Mn: 1.55-2.00%, P≤0.015%, S≤0.004%, Al: 0.01-0.05%, N≤0.005%, Cr: 0.15-0.50%, V: 0.1-0.35%, Nb: 0.01%-0.06%, Mo: 0.15-0.50%, Ti≤0.02%, and the balance of Fe and unavoidable impurities. Such components need to meet: 1.0≤[(Cr/52)/(C/4)+(Nb/93+Ti/48+V/51+Mo/96)/(C/12)]≤1.6. The tensile strength of the ultrahigh-strength hot-rolled steel plate and steel strip is ≥780MPa, the yield strength thereof is ≥660MPa, the tensile fatigue limit (10 million cycles) FL thereof is ≥570MPa, or the fatigue limit to tensile strength FL/Rm thereof is ≥0.72. The reaming rate meets: if an original hole is a punched hole, the reaming rate thereof is >85%; and if the original hole is a reamed hole, the reaming rate thereof is >120%.
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机译:超高强度热轧钢板和钢筋,具有良好的疲劳和铰孔性能及其制造方法。钢板和钢带部件的重量百分比为:C:0.07-0.14%,Si:0.1-0.4%,Mn:1.55-2.00%,P≤0.015%,S≤0.004%,Al:0.01 -0.05%,n≤0.005%,Cr:0.15-0.50%,V:0.1-0.35%,Nb:0.01%-0.06%,MO:0.15-0.50%,Ti≤0.02%,以及Fe和不可避免的余额杂质。这些组分需要满足:1.0≤[(Cr / 52)/(C / 4)+(Nb / 93 + Ti / 48 + V / 51 + Mo / 96)/(C / 12)]≤1.6。超高强度热轧钢板和钢带的拉伸强度≥780MPa,其屈服强度≥660MPa,其拉伸疲劳极限(1000万个循环)脂肪≥570MPa,或抗拉强度的疲劳极限FL / RM≥0.72。铰孔率满足:如果原始孔是穿孔孔,则其铰孔率> 85%;如果原始孔是铰孔,则其铰孔率> 120%。
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