High frequency quenching machine manufacturers briefly describe the annealing process of steel

1. ủ hoàn toàn

Process: Heating above Ac3 to 30-50°C → heat preservation → cooling to below 500 degrees with the furnace → air cooling to room temperature.

Purpose: to refine grains, uniform structure, improve plasticity and toughness, eliminate internal stress, and facilitate machining.

2. Ủ đẳng nhiệt

Process: heating above Ac3 → heat preservation → fast cooling to pearlite transformation temperature → isothermal stay → transformation to P → air cooling;

Purpose: Ibid. But the time is short, easy to control, and the deoxidation and decarburization are small. (Suitable for alloy steel and large carbon steel parts with relatively stable supercooled A).

3. Ủ hình cầu

Concept: It is the process of spheroidizing cementite in steel.