Steel for high-strength welding casing pipe for heavy oil thermal production well, production method of steel and heat treatment method of high-strength welding casing pipe for heavy oil thermal production well

The invention provides steel for a high-strength welding casing pipe for a heavy oil thermal production well and a production method thereof, and a heat treatment method of the high-strength welding casing pipe for the heavy oil thermal production well. The steel comprises the following components: 0.14%-0.20% of C, less than or equal to 0.30% of Si, 0.80%-1.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0050% of S, 0.10%-0.30% of Mo, 0.03%-0.06% of V, 0.01%-0.03% of Ti, 0.80%-1.20% of Cr and the balance of Fe. 0.020%-0.035% of Als and less than or equal to 0.0040% of N; and the balance of Fe and inevitable inclusions. The hot-rolled coil is obtained through reasonable component design, smelting and rolling processes, and the product has good strength and plasticity and higher high-temperature mechanical property and creep property through the heat treatment process. 本发明提供了稠油热采井用高强焊接套管用钢及生产方法、稠油热采井用高强焊接套管热处理方法，成分：C：0.14％-0.20％、Si：≤0.30％、Mn：0.80％-1.20％、P：≤0.015％、S：≤0.0050％、Mo：0.10％-0.30％