| 摘要 |
Disclosed is a 550 MPa high temperature-resistant pipeline steel, comprising the following chemical elements in percentages by mass: 0.061%=C=0.120%, 1.70%=Mn=2.20%, 0.15%=Mo=0.39%, 0.15%=Cu=0.30%, 0.15%=Ni=0.50%, 0.035%=Nb=0.080%, 0.005%=V=0.054%, 0.005%=Ti=0.030%, 0.015%=Al=0.040%, 0.005%=Ca=0.035%, and the balance being Fe and unavoidable impurities. Also disclosed is a manufacturing method of a 550 MPa high temperature-resistant pipeline steel, comprising the steps of: smelting, casting, slab heating, rough rolling, finish rolling, controlled cooling, and air cooling to room temperature. The pipeline steel has an excellent mechanical property under a high temperature. |
