... the new old customer your help!Shandong province prudent steel tube manufacturing Co., LTD existing total inventory of more than 60000 ... business 3000 kinds of specifications, 6 mm-820 mm diameter and wall thickness 2 mm-80 mm. Our factory can ... mm, wall thickness 6 mm-60 mm of seamless steel tube, material for: # 20, 45 #, 16 Mn, 27 SiMn, 15 ... ASTMA53, A106, API 5 L / 5 CT, DIN, JIS seamless tube, etc