Heat treatment is a controlled process used to alter the microstructure of metals and alloys such as steel and aluminium to impart properties which benefit the working life of a component, for example increased surface hardness, temperature resistance, ductility and strength.

Heat treatment is a method to adjust the property of steel by heat.The main methods of heat treatment are annealing ,tempering, normalizing and quenching.

What is annealing?

Annealing is to heat steel to certain temperature, maintain temperature in enough time, then cool steel in suitable speed.

What is tempering?

Tempering is to hear steel to certain temperature but lower than Ac1, maintain temperature in certain time, then cool to room temperature.

What is normalizing?

Normalizing is to heat steel over 30℃ ~ 50℃ than  Ac3 or Acm, maintain temperature in suitable time, than cool steel in flowing air.

What is quenching?

Quenching is to heat steel to certain temperature over than Ac3  or Ac1, maintain temperature in certain time, then cool the steel fast.

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