Seamless Tube for Precision Cold Drawing   1026, 20MnV6, 4130, 4145H, Q345B, 42CrMo, ST52, 4140 and other precision cold drawn pipes are optimized and improved in size and performance through cold drawing, cold rolling and other cold working processes, and have the advantages of high dimensional accuracy and good surface quality.   Common standards for precision cold drawn tubes   China Germany Europe USA GB/T3639 DIN2391 EN10305-1 ASTM A519   Main application: Oil well drilling, hydraulic props, oil cylinders, drilling tools, gas cylinders, construction machinery    ...