本发明公开屈服强度350MPa级运煤敞车用耐蚀钢及其制造方法.钢中含有C:0.021%~0.054%，Si:0.21%~0.29%，Mn:0.31%~0.44%，P≤0.018%，S≤0.006%,Als:0.015%~0.045%，Cr:0.31%~0.49%，Ni:0.11%~0.19%，Cu:0.21%~0.34%，Ti:0.008%~0.019%，Sb:0.031%~0.079%，Sn:0.021%~0.059%，Mo:0~0.19%，B:0~0.0019%，Ca:0.0008%~0.0030%，余量为铁和不可避免的杂质;135~170mm板坯加热至1228~1249℃，粗轧温度>1100℃，精轧1000~1100℃开轧,830~895℃结束轧制，卷取温度580~650℃，钢板具有优异的耐硫酸和氯离子腐蚀性能。

The invention discloses corrosion-resistant steel its manufacturing method for coal carriage with a yield strength of 350MPa . The steel contains C: 0.021%~0.054%, Si: 0.21%~0.29%, and Mn: 0.31%~0.44%, P≤0.018%, S≤0.006%, Als: 0.015%~0.045%, Cr: 0.31%~0.49%, Ni: 0.11%~0.19%, Cu: 0.21%~0.34%, Ti: 0.008%~ 0.019%, Sb: 0.031%~0.079%, Sn: 0.021%~0.059%, Mo: 0~0.19%, B: 0~0.0019%, Ca: 0.0008%~0.0030%, the balance is Fe and unavoidable impurities.This invention includes heating the 135~170mm thick slab to 1228~1249℃, then the rough rolling temperature should be greater than 1100℃, the finishing rolling start temperature is between 1000~1100℃, and the rolling is finished at 830~895℃. The final coiling temperature is 580~650℃, so that the steel plate has excellent resistance to sulfuric acid and chloride ion corrosion.