本发明涉及高铁用钢材制造领域，尤其涉及一种高韧性高耐候钢及其制备方法。本发明所设计的高韧性高耐候钢的制备方法包括步骤:1)冶炼:将生铁、废钢铁合金加入转炉冶炼、转炉、吹炼、RH炉精炼后钢水的成分及其重量百分比为， C:0.06~0.17%、N:0.006~0.017%、Si:0.2~0.40%、Mn:0.8~1.7%、Ti:0.007%~0.020%、 Cr:0.35~1.50%、Ni:0.154~1.00%，余量为Fe:其中C/N比值为10~22, Ni/N比值为20~100;2)浇注成型:3)热轧;4)冷却。与传统的高韧性高耐候钢相比，本发明优化钢的化学成分、限定了 C/N比和Ni/N比以及改进了工艺步骤来提高钢基的强韧性,增强钢基的抗腐蚀性。

The invention relates to the manufacturing field of high-speed iron steel, in particular to a high toughness and high weathering steel and its preparation methods.The preparation method of the invention includes the following steps:1)Smelting: The composition and weight percentage of molten steel after adding pig iron and scrap iron and steel alloy into converter smelting, converter, blowing, and RH furnace refining are: C: 0.06~0.17%, N: 0.006~0.017%, Si: 0.2~0.40% , Mn: 0.8~1.7%, Ti: 0.007%~0.020%, Cr: 0.35~1.50%, Ni: 0.154~1.00%.The balance is Fe,where the C/N ratio is 10-22, and the Ni/N ratio is 20~100;2) Pouring molding: 3) Hot rolling; 4) Cooling. Compared with the traditional high toughness and high weathering steel, the present invention optimizes the chemical composition of the steel, limits the C/N ratio and the Ni/N ratio, and improves the process steps to improve the strength and toughness of the steel base and enhance the corrosion resistance of the steel base .