Hardness test of chemical heat treatment workpiece

There are three kinds of hardness testing standards for heat treatment, namely vickers, rockwell and surface rockwell. According to the different heat treatment methods, the hardness testing methods of surface quenching and tempering heat treatment furnace and chemical heat treatment furnace are also different.

The main technical parameters of chemical heat treatment workpiece is the hardened layer depth and surface hardness, the hardened layer depth or to use vickers hardness tester to detect, detect from the workpiece surface to hardness to 50HRC that point distance, this is the effective hardening depth.

Chemical heat treatment is to make the workpiece surface into one or several chemical elements of the atom, so as to change the chemical composition, structure and performance of the surface of the workpiece. After quenching and tempering, the workpiece surface has high hardness, wear resistance and contact fatigue strength, and the workpiece core has high toughness.

The surface hardness detection of chemical heat treatment workpiece and surface quenching heat treatment workpiece hardness detection is similar, can use vickers hardness tester, surface rockwell hardness tester or rockwell hardness tester to detect, but the thickness of nitrided thick is relatively thin, generally not greater than 0.7mm, then can not use rockwell hardness tester.

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