Stainless steel Valve accessory 1) Process; Hot forging 2) Material: Inconel 718, inconel 625, monel, hastelloy etc alve stem ( Inconel 718, UNS N07718 ) 1). Material: Main material of ... various superalloys and duplex stainless steels. eg. Inconel, Monel, Incoloy, Hastelloy, and Duplex F53 etc.2). Product included: Balls, rods, tubes, sleeves ...