Abstract: The commercial pilot production for 693 pieces of 168 mm x 7 mm tube rolled by Accu-Roll mill from 192. 39 t Φ180 mm round casting bloom of steel B grade (0. 20% C) with center line shrinkage rating W2 has been carried out. Results show that the yield of rolled tube is 90% ； there are not defects in internal surface of tube such as internal overlap, abscess layer and cracks； the tube isn't leaking water by water pressure test with 15 MPa for 5 s and each tube is passed and qualified by ultrasonic examination according to standard GB/T5777-1996 with artificial defect depth rating C12. 5.

Key words: Round Casting Bloom, Center Line Shrinkage, Accu-Roll Tube Mill, Tube, Surface Quality

摘要： 对192.39 t中心缩孔≤2级的B级钢(0.20%C)Φ180 mm铸坯进行了用Accu-Roll轧管机轧成693根168 mm×7 mm钢管的工业性试验。结果表明,钢管成材率为90%,内表面没有折叠、离层、裂纹等缺陷,15 MPa5 s水压试验后没有出现漏水,每根钢管通过GB/F5777-1996标准人工缺陷深度等级C12.5超声波探伤检验合格。

关键词: 圆铸坯, 中心缩孔, Aceu-Roll轧管机, 钢管, 表面质量