Abstract: Developmental 110SS steel Φ325 mm × 55 mm thick-wall seamless pipe ( /% ：0. 28 ~0.33C,0. 20 ~ 0.30Si, 0.60~1.00Mn, ≤0.015P, ≤0. 005S, 1. 20 ~ 1.45Cr,0. 65 ~0.85Mo,0.01 ~ 0.05Al, 0.01 ~0.05Ti, 0. 01 ~ 0. 05Nb,0. 01 ~0. 10V ) is produced by process of BOF-LF-RH-CC-ASSE1 rolling. By controlling BOF end point [C] ≥ 0. 03% , LF refining slag basicity 3. 0 ~4. 0, HR vacuum treating for ≥30 min, CC steel overheating ≤15 ℃ , continuous casting speed 0, 30 ~ 0. 50 m/min, steel pipe quenching temperature at 880 ℃ and tempering at 650 ℃ , the product inclusion size is less than 20 μm，yield strength is 760 ~820 MPa, at that time, the thick wall seamless steel pipe meets the requirements of hydrogen sulfide-proof.

摘要： 开发的110SS钢(/%:0.28～0.33C,0.20～0.30Si,0.60～1.00Mn,≤0.015P,≤0.005S,1.20～1.45Cr,0.65～0.85Mo,0.01～0.05Al,0.01～0.05Ti,0.01～0.05Nb,0.01～0.10V)Φ325 mm×55 mm厚壁管的生产流程为BOF-LF-RH-CC-ASSEl rolling。通过控制BOF出钢C≥0.03%,LF渣碱度3.0～4.0,RH真空时间≥30min,连铸钢的过热度≤15℃,拉速0.30～0.50 m/min,钢管淬火温度880℃,回火温度650℃时,得到产品夹杂物尺寸≤20μm、屈服强度760～820 MPa,厚壁无缝钢管的抗硫化氢应力耐腐蚀性能满足标准要求。

关键词: 110SS钢, 抗硫化氢应力腐蚀, 厚壁无缝钢管