... injection modling machine. 2, 38CrMoAlA base material; 3, bimetallic powder treatment; With the perfect design, our injection ... 40Cr, 42CrMo, SKD-61, Stainless Steel, etcSurface CoatingNitriding, Bimetallic, Hard Chrome Plated, Quenching, ect.Technical DataNitriding thickness: 0 ... material from screw body, like SKD61 or bimetallic (alloy) coating. Bimetallic screw barrel are also available:Four kinds ...