CARBURIZED AND QUENCHED MEMBER AND METHOD FOR PRODUCTION THEREOF

摘要

Provided are a carburized and hardened member that allows strength enhancement while sufficiently reducing the hardening strain, without increasing the production cost, and a production method for the carburized and hardened member. An alloy steel which contains Fe as a main component and contains 0.10 to 0.50 wt.% of C and 0.50 to 1.50 wt.% of Si and whose hardenability J based on an end quenching test is in a range of 35 to 50 (at 12.5 mm) is used as a raw material. After the material is formed into a member of a desired shape, a carburized layer is formed by performing a carburizing process in an oxidation inhibitive atmosphere. After the carburizing process, a quenching process is performed in a condition that cooling is monotonously performed from a pearlite transformation point (A1 point) to a martensite transformation start point (Ms point), and a condition that a severity of quenching H is in a range of 0.01 to 0.08 (cm<-1>). <IMAGE>