文档介绍：金属材料处理办法
How many kinds of heat treatment of metal materials are there? What are the characteristics of each?
Metal maof low carbon steel.
Normalizing is mainly suitable for general parts which need no quenching and tempering and quenching and can not be quenched and quenched and tempered. When normalizing, the heating temperature of steel is 753. 900 degrees C.
(2) quenching and tempering
Quenching can be divided into overall quenching and surface hardening, quenching of steel after tempering. Tempering is to eliminate or reduce the residual stress of quenched steel, to harden steel in Si and fabric tends to be stable. In order to obtain different hardness in order to obtain different hardness, the tempering temperature can be divided into several temperature zones.
The purpose of low temperature tempering after quenching is to reduce the residual stress and brittleness in the steel, and to maintain the high hardness and wear resistance of the steel after quenching, and the hardness is within the range of HRC58 64. Suitable for all kinds of tools, carburizing parts and rolling bearings. The tempering temperature is 150? 250 Xi.
The purpose of medium temperature tempering after quenching is to maintain a certain toughness of steel and improve its elasticity and yield limit on this basis. The utility model is suitable for various springs, forging dies and impact resistant