... forging 2) Material: Inconel 718, inconel 625, monel, hastelloy etc Valve stem 1) Process; Hot forging 2) Material: Inconel 718, inconel 625 ... , monel, hastelloy etcvalve stem 1). Material: Main material of our forgings include various superalloys ... -base alloys, Iron-base alloys, and Cobalt-base alloys ,etc. Valve stem