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Contact SupplierHigh quality alloy steel
1) 38crmoaia(jis sacm645)
2) 42crmo(aisi 4140)
nitriding treatment
vacuum quenching
high-frequency quenching
electroplated hard-chrome finish
spray coating bimetallic alloy
ningbo tianze machinery technology company , over 29 years in screw and barrel line , your inquiry pls find kaylee(at)tizatech.com , we will be highly appreciate to received your inquiry !.