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AK-(U2)≥70J,断面收缩率≥50％,硬度≥410HBW。

The invention provides a high strength and toughness bainite rail and a manufacturing method thereof. The composition of the rail is as follows according to the weight percentage: 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%, the remaining is Fe and inevitable impurities. The manufacturing method includes smelting continuous casting reheating rolling tempering; The produced rail has tensile strength ≥ 1350MPa, yield strength ≥ 1150mpa, elongation ≥ 14%, impact absorption energy AK - (U2) ≥ 70j, section shrinkage ≥ 50%, hardness ≥ 410hbw in normal temperature impact test.