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1, the hardness of the workpiece heat treatment using hardness tester. PHR series portable surface Rockwell hardness tester is very suitable for testing the hardness of the surface heat treatment of the workpiece, you can test the effective depth of more than 0.1mm of various surface heat treatment of the workpiece. Simple operation, easy to use, low price, can read the hardness value.

2, surface heat treatment is divided into two categories, one is surface quenching and tempering heat treatment, the other is chemical heat treatment, the hardness test method is as follows: chemical heat treatment is to make the workpiece surface infiltration of one or several chemical elements of atoms Change the chemical composition of the workpiece surface, organization and performance. After quenching and tempering at low temperature, the workpiece surface has high hardness, wear resistance and contact fatigue strength, and the workpiece core has high strength and toughness.

3, chemical heat treatment The main technical parameters of the workpiece is the hardened layer depth and surface hardness. Hardened layer depth or to use Vickers hardness tester to detect. Detection from the surface to the hardness of 50HRC down to that point. This is the effective hardening depth of chemical heat treatment of the workpiece surface hardness testing and surface hardening heat treatment of the workpiece hardness testing can be Vickers hardness tester, Rockwell hardness tester or Rockwell hardness tester to detect, but the nitriding thickness than the thickness Thin, generally not more than 0.7mm, then you can no longer use Rockwell hardness. Parts if the local hardness requirements higher, the induction hardening can be used for local quenching heat treatment, such parts are usually marked on the drawings of the local quenching heat treatment position and the local hardness value. Part hardness testing to be carried out within the designated area. Hardness testing equipment Rockwell hardness tester can be used to test the hardness value of HRC, such as heat treatment hardening layer is shallow, the surface Rockwell hardness tester can be used to test the hardness value of HRN.

4, surface hardening and tempering heat treatment is usually induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. Hardness testing can be Vickers hardness tester, Rockwell or Rockwell hardness tester can also be used. The choice of test force (scale) is related to the effective hardened layer depth and the surface hardness of the workpiece. Here are three types of hardness tester. Vickers hardness tester heat treatment is an important means to test the surface hardness of the workpiece, which can choose 0.5 ~ 100kg test force, the test as thin as 0.05mm thick surface hardened layer, it is the highest precision, the workpiece surface hardness can be distinguished difference. In addition, the effective hardened layer depth should also be Vickers hardness tester to detect, so for surface heat treatment or large use of surface heat treatment of the workpiece units, equipped with a Vickers hardness is necessary.

5, the surface Rockwell hardness tester is also very suitable for testing the hardness of the surface hardening of the workpiece, Rockwell hardness of the surface there are three kinds of ruler can choose. Can test the effective hardening depth of more than 0.1mm various surface hardening workpiece. Although Rockwell hardness is not as high as the Vickers hardness tester, it has been able to meet the requirements as a test tool for quality management and conformity inspection of heat treatment plants. Moreover, it also has the characteristics of simple operation, convenient use, low price, rapid measurement and direct reading of the hardness value. The surface Rockwell hardness tester can rapidly and non-destructively inspect the batches of surface heat-treated work pieces one by one. This is of great significance for metalworking and machinery manufacturing plants. When the surface heat treatment hardened layer thicker, you can also use Rockwell hardness tester. When the hardened layer thickness of 0.4 ~ 0.8mm, the HRA scale can be used, when the hardened layer thickness exceeds 0.8mm, the HRC scale can be used.

6, Vickers, Rockwell and surface Rockwell hardness values ​​can be easily converted to each other, converted into standards, drawings or user needs hardness values. The corresponding conversion tables are given in International Standard ISO, American Standard ASTM and Chinese Standard GB / T.