... 20#OD:20-660MM WT:5-60MM,Standard: Tianjin large seamless, small seamless, baotou, hengyang, chengdu, exist issues now days, ... new old customer your help!Shandong province prudent steel tube manufacturing Co., LTD existing total inventory of more ... Mm-273 mm, wall thickness 6 mm-60 mm of seamless steel tube, material for: # 20, 45 #, 16 Mn, 27 ... , A106, API 5 L / 5 CT, DIN, JIS seamless tube, etc