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What are the heat treatment processes

What are the heat treatment processes

1. Annealing operation method: after heating steel parts to a temperature of Ac3+30~50 degrees, or Ac1+30~50 degrees or less (relevant data can be consulted), the steel parts are generally cooled slowly with the furnace temperature.11 (32).jpg

2. Normalizing operation method: heat steel parts to 30~50 degrees above Ac3 or Accm, and cool them at a cooling rate slightly higher than annealing after heat preservation.

3. Quenching operation method: heat steel parts to a phase-change temperature of Ac3 or above, keep warm for a period of time, and then cool quickly in water, nitrate, oil, or air. Objective: quenching is generally in order to get high hardness martensite structure, sometimes for some high alloy steel, such as stainless steel, wear-resistant steel quenching, is in order to get a single homogeneous austenitic organization in order to improve the wear resistance and corrosion resistance.井式淬火炉 (7).jpg

4. Tempering operation: reheat hardened steel parts to a certain temperature below Ac1 and cool them in air, oil, hot water and water after heat preservation.

5. Tempering operation method: after quenching, high temperature tempering is called tempering. The steel parts are heated to a temperature 10-20 degrees higher than that of quenching. After heat preservation, quenching is carried out, and then tempering is carried out at a temperature of 400-720 degrees.井式回火炉 (2).jpg

6. Aging operation method: heat steel parts to 80~200 degrees, keep them warm for 5~20 hours or longer, and then cool them in the air as the furnace is taken out. Purpose: 1. To stabilize the hardened structure of steel parts and reduce the deformation during storage or use; 2. Reduce the internal stress after quenching and grinding, and stabilize the shape and size.

7. Cold treatment operation method: the hardened steel parts are cooled to -60 ~ -80 degrees or lower in low temperature media (such as dry ice and liquid nitrogen), and the uniform temperature is taken out to room temperature.

8. Quenching operation method of flame heating surface: use the flame of oxygen-acetylene mixed gas combustion, spray it to the surface of steel parts, and heat it quickly. When the quenching temperature is reached, immediately spray water to cool it.

9. Induction heating surface quenching operation method: the steel parts are put into the sensor, so that the steel parts surface generates induction current, heating to the quenching temperature in a very short time, and then water cooling.

10. Carburizing operation method: put the steel parts into the carburizing medium, heat it up to 900 ~ 950 degrees and keep warm, so that the steel parts can obtain a certain concentration and depth of carburizing layer.

11. Nitride operation method: used in 5. The reactive nitrogen atoms decomposed by ammonia at ~ 600 degrees saturate the surface of steel parts and form a nitriding layer.IMG_1391.jpg

12. Nitrogen carburizing operation: carburizing and nitriding simultaneously to the surface of steel parts. Objective: to improve the surface hardness, wear resistance, fatigue strength and corrosion resistance of steel parts.

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