Abstract: Based on standard API 5L the designed chemical composition of pipe line steel tube X52QS is (/% ): 0.11~0. 14C, 0.20~0.35Si, 0.95~1.20Mn, ≤0.010P, ≤0.0015S, 0.10~0.20Ni, 0.10~0.20Cu, 0.008~0.020Ti, and 0.0015~0.0040Ca. The batch production of pipe line steel tube X52QS is carried out by process of 100t EAF-LF + VD refinig-Φ210mm round bloom casting-ACCU ROLL mill rolling-heat treatment quenching at 880°C -tempering at 655 ℃.The main process measures are EAF end controlling liquid temperature 1620~1640℃ , 0.05%~0.08%C, ≤0.008%P, refining slag ingredient (/%): 58CaO, 7SiO₂, 22Al₂O₃, 8MgO and 3% fluoride, and feeding Ca-Si wire after VD process. The examination results show that the main structure of pipe line steel tube X52QS is ferrite + tempered bainite, the rating of grain size ≥8.5 , the total rating of various inclusions ≤2, the mechanical properties and antihydrogen sulfide corrosion performance meet the requirement of standard API 5L, and the steel tube has excellent weld and low temperature impact toughness and its ductile-brittle transition temperature is -95℃.

摘要： 根据API5L标准设计的X52QS管线钢管的化学成分为（/%）:0.11~0.14C，0.20~0.35Si，0.95~1.20Mn，≤0.010P，≤0.0015S，0.10~0.20Ni，0.10~0.20Cu，0.008~0.020Ti，0.0015~0.0040Ca。采用"100t EAF-LF+VD精炼-Φ210mm圆坯连铸-精密斜轧机组轧制-880℃淬火-655℃回火调质热处理"工艺流程对X52QS钢管进行了批量化生产。主要工艺措施为电弧终点控制钢水温度1620~1640℃，0.05%~0.08%C，≤0.008%P,精炼渣组分（/%）:58CaO，7SiO_2，22Al₂O_3，8MgO，3%氟化物，VD后喂Ca-Si线等。检验结果表明，X52QS管线钢管的金相组织主要为铁素体+回火贝氏体，晶粒度≥8.5级，各类夹杂物的总和≤2级;力学性能和抗硫化氢腐蚀性能完全满足API 5L的标准要求；具有良好的焊接性能和低温冲击韧性，韧脆转变温度为-95℃。

关键词: X52QS管线钢管, 抗硫化気腐蚀, 化学成分, 调质处理, 生产实践