本发明公开屈服强度700MPa级运煤敞车用耐蚀钢及其制造方法。钢中含有C:0.055%~0.079%, Si:0.21%~0.29%, Mn:1.41%~1.69%, P≤0.018%,S≤0.006%, Als:0.015%~0.045%, Cr:0.51%~0.99%, Ni:0.11%~0.19%, Cu:0.29%~0.46%, Nb:0.041%~0.062%, Ti:0.017%~0.042%, Sb:0.051%~0.119%, Sn:0.037%~0.089%, Mo:0.11%~0.19%, B:0.0008%~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℃终轧, 580~650℃卷取, 钢板耐硫酸和氯离子腐蚀性能优异。

The invention discloses corrosion-resistant steel its manufacturing method for coal carriage with a yield strength of 700MPa . The steel contains C:0.055%~0.079%,Si:0.21%~0.29%，Mn:1.41%~1.69%，P≤0.018%,S≤0.006%,Als:0.015%~0.045%，Cr:0.51%~0.99%，Ni:0.11%~0.19%,Cu:0.29%~0.46%，Nb:0.041%~0.062%，Ti:0.017%~0.042%，Sb:0.051%~0.119%，Sn:0.037%~0.089%，Mo:0.11%~0.19%，B:0.0008%~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.