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发明公开
CN110468347A 一种高强韧性贝氏体钢轨及其制造方法 有权

一种高强韧性贝氏体钢轨及其制造方法
摘要：
本发明提供了一种高强韧性贝氏体钢轨及其制造方法，该钢轨的成分按重量百分比计如下：C：0.20％～0.30％，Si：1.00％～1.80％，Mn：1.80％～2.80％，P：≤0.025％，S：≤0.015％，Cr：0.50％～1.00％，Mo：0.40％～0.70％，Nb：0.02％～0.08％，V：0.05％～0.10％，Ti:0.003％～0.020％，O≤0.0005％，N：0.0030-0.0060％，余量为Fe和不可避免的杂质。制造方法包括冶炼—连铸—再加热—轧制—回火；生产出的钢轨抗拉强度≥1350MPa，屈服强度≥1150MPa，延伸率≥14％，常温冲击试验的冲击吸收能量AKU2≥70J，断面收缩率≥50％，硬度≥410HBW。
摘要（英）：

The invention provides a high strength and toughness bainite steel rail and a manufacturing method thereof. The components of the steel rail are as follow, by weight percentage, 0.20%-0.30% of C, 1.00%-1.80% of Si, 1.80%-2.80% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.015% of S, 0.50%-1.00% of Cr, 0.40%-0.70% of Mo, 0.02%-0.08% of Nb, 0.05%-0.10% of V, 0.003%-0.020% of Ti, smaller than or equal to 0.0005% of O, 0.0030%-0.0060% of N and the balance Fe and inevitable impurities. The manufacturing method comprises smelting-continuous casting-reheating-rolling-tempering. According to the produced steel rail, the tensile strength is larger than or equal to 1350 MPa, the yield strength is larger than re qual to 1150 MPa, the percentage elongation is larger than or equal to 14%, the impacting absorbed energy AKU2 of a normal temperature impact test is larger than or equal to 70 J, the reduction of area is larger than or equal to 50%, and hardness is larger than or equal to 410 HBW.

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