一种含氮低屈强比高铁用耐候钢,其组分及wt%:C:0.20~0.50%，N:0.006~0.03%,Si:0.2~0.40%，Mn:0.8~1.7%,

Ti:0.007%~0.020%, Cr:1.80~3.50%，余量为Fe。生产方法:转炉冶炼后进入氩站进行吹炼;经真空处理后浇注;将钢坯加热;经高压除鳞后粗轧;精轧;冷却。本发明能在保证钢板硬度前提下，使钢的基体组织为初生铁素体、珠光体及奥氏体三相复合组织，屈服强度在≥370MPa，抗拉强度>600MPa，延伸率A>26.5%，-60℃夏比冲击功不低于260J/cm2，屈强比不高于0.69、腐蚀速率不超过0.082mg/cm2.h，从而满足高铁的需要，延长服役周期。

A nitrogen-containing low yield ratio weathering steel for high-speed iron rail. Its composition and percentage content are %: C: 0.20~0.50%, N: 0.006~0.03%, Si: 0.2~0.40%, Mn: 0.8~1.7% ,

Ti: 0.007%~0.020%, Cr: 1.80~3.50%, and the balance is Fe.Its production method is as follows: first, it enters the argon station for blowing after smelting in a converter; then it is vacuum-treated and poured;the billet is heated and then subjected to high-pressure descaling before rough rolling、finishing rolling and cooling. The invention can make the steel matrix structure into a three-phase composite structure of primary ferrite, pearlite and austenite under the premise of ensuring the hardness of the steel plate. And the yield strength is ≥370MPa, the tensile strength>600MPa, and the elongation rate A>26.5% , -60℃ Charpy impact energy is not less than 260J/cm2, yield ratio is not higher than 0.69, corrosion rate is not more than 0.082mg/cm2.h for steel plate, so as to meet the needs of high-speed rail and extend the service period.