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The difference between normalizing and tempering

Zoe Jia 2023-05-19 11:18:10
First, the nature is different

1. Tempering: a heat treatment process used to improve the comprehensive mechanical properties of iron and steel materials.

2. Normalizing: a kind of heat treatment to improve the toughness of steel.

Second, the application is different

1. Quenching and tempering application: quenching and tempering treatment is widely used in structural parts that require excellent comprehensive performance, especially working under alternating loads, such as shafts and gears of automobiles, turbine shafts of aero-engines, compressor discs, etc.

Structural steel parts that require induction heating and quenching, before surface quenching, are usually tempered to obtain fine and uniform sostenite, which is conducive to surface hardening layer and can also make the core obtain good comprehensive mechanical properties.

2. Normalizing application:

(1) Austenite grains can be refined to homogenize the tissue.

(2) Reduce the content of ferrite in subconcentric steel, increase and refine the pearlite content, so as to improve the strength, hardness and toughness of steel.

(3) General structural steel parts, such as parts with a carbon content of 0.4%-0.7% and low mechanical properties, can use normalizing as the final heat treatment.

(4) In order to improve the mechanical properties of some steel plates, pipes, steel strips and section steels, normalizing can be used as the final heat treatment.