Operation method: cool the quenched steel pieces in low temperature medium (such as dry ice and liquid nitrogen) to - 60 ~ - 80 ℃ or lower, and take out the uniform temperature to room temperature after the temperature is uniform.
Intention:
The remaining austenite in the quenched steel is transformed into martensite, and then the hardness, strength, wear resistance and fatigue limit of the steel are improved;
The arrangement of stabilizing steel to stabilize the shape and dimension of steel parts.
Application key:
(1) After quenching, the steel parts should be cooled immediately, and then tempered at low temperature to eliminate the internal stress during low temperature cooling;
(2) Cold treatment is mainly applicable to tight cutting tools, measuring tools and tight parts made of alloy steel.
On 2018-08-08 11:45:46
