27siMn无缝钢管70×4-4.5-5-6-7-8-9-10-12-15-16 40 146×4.5-6-8-12-14-16-18-20-25-30 60 245×25-28-30-34-40 84 73×4-4.5-5-6-7-8-9-10-12-15 50 152×4.5-6-8-12-14-16-18-20-25-30 60 273×7-9-12-15-18-20-25 100 76×4-4.5-5-6-7-8-9-10-12-14 60 159×4.5-6-10-12-14 80 273×30-35-38-40 50 83×4.5-5-10-12-14-16-18-20 30 159×16-18-20-22-25-30 30 299×8-12-16-20-24-28 60