It can be 0.5~100kg choice of test force, testing of thin to thick surface hardened layer in 0.05mm, its accuracy is the highest, you can tell the minor differences surface hardness. In addition, the effective hardening depths up to Vickers hardness tester to test, therefore, for surface heat treatment processing or extensive use of workpiece surface heat treatment unit, equipped with a Vickers hardness tester is necessary.
Surface Rockwell hardness tester is also very suitable for testing surface quenched hardness of the workpiece, Rockwell hardness tester there are three rulers can be selected. INA bearing can be test-hardened workpieces for the effective hardening depths greater than 0.1mm. Despite the superficial Rockwell hardness precision no-Vickers hardness meter high, but as a means of heat treatment factory quality control and conformity check inspection, had been able to meet the requirements. Generally is not greater than 0.7mm, then you can no longer use Rockwell hardness tester.
Part if the local high hardness requirements, local heat for induction heating method available, such parts are usually marked on the drawings of local location of the heat and hardness values. Hardness testing of parts within the specified range. Hardness testing equipment can be used for Rockwell hardness tester, test HRC hardness value, such as heat treatment-hardening layer shallow, surface Rockwell hardness tester, hardness value testing HRN.
Surface hardening induction heating or tempering heat treatments typically used INA bearing flame heating way. Main technical parameters of local surface hardness, hardness and effective hardening depth. Hardness testing Vickers hardness tester can be used, can also be used Rockwell or the superficial Rockwell hardness tester. Test force (ruler) selection and effective hardening layer of depth and hardness of workpiece surface about INA bearings. It involves three kinds of hardness. Vickers hardness test heat treatment hardness of workpiece surface is an important means of INA bearing optional 0.5~100kg test, test of thin surface hardened layer to 0.05mm thick, its accuracy is the highest, you can tell the minor differences surface hardness. In addition, the effective hardening depth for the Vickers hardness tester and it also has simple operation, ease of use, lower prices, measuring characteristics of rapid, hardness value can be read directly, using surface Rockwell hardness tester batch heat treatment on the surface of the workpiece can be quickly by piece of non-destructive testing. Which are important for metal processing and machinery manufacturing plant.
When you surface heat treatment-hardening layer thicker, Rockwell hardness tester can also be used. When the hardened layer thickness is 0.4~0.8mm, to be used in HRA ruler, when hardened layer thickness of more than 0.8mm, the HRC rulers can be used.
Deeper than surface heat treatment of 0.1mm artifacts. Operation is simple, easy to use, lower prices, INA bearings can be directly read the hardness value.
Surface heat treatment is divided into two categories, one is the surface quenching tempering heat treatments, another type of chemical heat treatment, hardness testing methods are as follows:
Chemical treatment is to make the surface into one or several atoms of chemical elements, thereby changing the chemical composition, microstructure and mechanical properties of the workpiece surface. After quenched and tempered at low temperature, workpiece surfaces with high hardness, wear resistance and contact fatigue strength,
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