Surface quenching only heat-treats the surface or part of the surface of the workpiece, so only the surface structure is changed.
The structure in the core or other parts still retains its original properties of low hardness, high plasticity and high toughness, so the properties of the workpiece cross section are different due to different structures. Surface quenching facilitates mechanization and automation.
The quality is stable, the deformation is small, the heat surface treatment cycle is short, the cost is low, and the cost is low. Carbon steel can also be used to replace some Taijin steel.
Chemical heat treatment is to penetrate the atoms of certain chemical elements into the surface of the workpiece, changing the chemical composition of the surface layer, so that the surface can obtain high hardness or certain special physical and chemical properties. The heart tissue composition remains unchanged and retains its original high plasticity. High toughness performance, so that there are completely different chemical compositions and structural properties on the cross-section of the workpiece.
The production cycle of chemical heat surface treatment is long, which makes it difficult to realize mechanized and automated production. The process is complicated, the quality is not stable enough, the auxiliary materials are consumed a lot, the cost is high, and the cost is high. In many cases, precious alloy steel is also required. Chemical heat treatment is better than surface quenching only in obtaining higher hardness and certain special properties of the surface layer and high toughness of the core.
Link to this article：The difference between surface quenching and chemical heat treatment
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