本发明公开了一种屈服强度500MPa级的耐多种介质腐蚀钢及其制备方法,其化学成分的质量百分比为C:0.06~0.10%,Mn:0.70~1.20%,Si:0.15~0.40%,P≤0.025%,S≤0.01%,Cu:0.20~0.40%,Ni:0.20~0.50%,Cr:0.50~1.00%,Sb:0.02~0.12%,Sn:0.005‑0.03%,Nb:0.02~0.05%Ti:0.015~0.025%,Ca:0.001~0.003%,N≤0.006%,其余为Fe和不可避免的杂质,能耐氯离子、硫酸根和亚硫酸根离子混合介质腐蚀,其屈服强度在500MPa以上,‑40℃冲击韧性≥80J,焊接性能优良。
The invention discloses a multi-medium corrosion resistant steel with yield strength of 500 MPa and its preparation method. The mass percentage of chemical composition is C : 0.06 ~ 0.10 %, Mn : 0.70 ~ 1.20 %, Si : 0.15 ~ 0.40 %, P ≤ 0.025 %, S ≤ 0.01 %, Cu : 0.20 ~ 0.40 %, Ni : 0.20 ~ 0.50 %, Cr : 0.50 ~ 1.00 %, Sb : 0.02 ~ 0.12 %, Sn : 0.005 ~ 0.03 %, Nb : 0.02 ~ 0.05 % Ti : 0.015 ~ 0.025 %, Ca : 0.001 ~ 0.003 %, N ≤ %. The rest is Fe and inevitable impurities, which can resist chloride ion, sulfate ion and sulfite ion mixed medium corrosion. The yield strength is above 500 MPa, the impact toughness is ≥ 80 J at 40 °C, and the welding performance is excellent.