... according to customers' requestsmotorcar cassis, airport structure, shipbuilding, automobile axle pipe and so on.4) Use: construction structure, machinery making, ... ) Standards: JIS G 3466, DIN EN 10210, DIN EN10219, ASTM A500, GB/T 3094-2000, GB/T 6728-20022) Material ... : Q235, Q345, 20#, ST37, ST44, ST52, ASTM A53, ASTM A106,STKR4907) Plain or beveled ends Seamless Square Steel ...