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Application filed by Хмельницкий Национальный УниверситетfiledCriticalХмельницкий Национальный Университет
Priority to UAU201102299UpriorityCriticalpatent/UA65922U/en
Publication of UA65922UpublicationCriticalpatent/UA65922U/en
A method for improving the durability of extruder screw consists in chemical and heat treatment. The screw is made of high-chromium steel with carbon content greater than 0.9%, which surface is strengthened by the hardening with tempering for the receiving of steel microstructure with an optimal content of residual austenite, strengthened by ion nitriding with subsequent quenching and tempering for the forming of steel microstructure with the optimum content of residual nitrogen austenite.
UAU201102299U2011-02-282011-02-28METHOD FOR IMPROVING DURABILITY of extruder screw
UA65922U
(en)
Steel for case hardening which has excellent cold workability and machinability and which exhibits excellent fatigue characteristics after carburizing and quenching, and process for production of same