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。