Steel Pipe, Steel Coil, Steel Sheet manufacturer / supplier in China, offering Hot Rolled Alloy Steel Round Bar 4140 4340 8620 Dia. 10mm - 500mm ASTM A29 Forged Bar Stock for Shafts & Axles Manufacturing, Precision Ground & Polished Round Bar 20mm to 200mm Diameter 20# 45# Steel ASTM A108 Carbon Steel Solid Shaft for General Machining Parts, Black Surface Hot Rolled Round Steel Bar Q195 Q235 Q355 GB/T 1591 ASTM A572 High Strength Solid Round Rod for Building Structure Construction Engineering and so on.