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Parallel Twin Screw & Barrel 38CrMoAlA L/D 18-35 Material High quality alloy-steel 1) 38CrMoAIA(JIS SACM645) 2) 42CrMo(JIS SCM440) 3) 9Cr18MoV 4) CW6Mo5Cr4V2 Heat-Treatment Nitriding treatment ...