... , Seamless rolled ring, rough machining and fine machining. The diameter of the rings can be 6,300mm max.2) Standards: ASTM, ASME, AISI ... , Alloy steel. AISI 8620, 4320, 4130, 4140, 4340, 18CrNiMo7, 42CrMo4, A 182 F304/F316/F410, A105….4) Application : Nomally used for ...