Various types of heat treatment and hardness requirements for hardware shrapnel
Source: Benco Date: 2017/12/27 11:53:44 Visited:
1, The hardness of the heat treated workpiece is tested by the hardness tester. The PHR series portable surface Rockwell hardness tester is very suitable for detecting the hardness of the surface heat treatment workpieces, and it can test all kinds of surface heat treatment parts with a depth of more than 0.1mm. Simple operation, easy to use, low price, can directly read the hardness value.
2, surface heat treatment is divided into two categories, one is the surface quenching and tempering treatment, the other is the chemical heat treatment, the hardness test method: chemical heat treatment is to make the surface of the workpiece into one or several chemical elements atoms, thus changing the chemical composition, microstructure and mechanical properties of the workpiece surface. After quenching and low temperature tempering, the surface of the workpiece has high hardness, wear resistance and contact fatigue strength, and the core of the workpiece has high strength and toughness.
3, The main technical parameters of the chemical heat treatment work are the depth of the hardened layer and the surface hardness. The depth of the hardened layer is determined by the Vivtorinox hardness tester. Detect the distance from the surface of the workpiece to the point of the hardness to 50HRC. This is the hardness of surface hardness and effective hardening depth of chemical heat treatment of workpiece detection and surface quenching workpiece detection can be similar to that of the surface Rockwell hardness and Rockwell hardness tester to test Vivtorinox hardness and nitriding, only thick thin, generally not more than 0.7mm, then you can not use the Rockwell the hardness of the. If the local hardness of parts is high, local heating and heat treatment can be done by induction heating and so on. Such parts usually mark the location and local hardness values of local quenching and heat treatment on the drawings. The hardness test of the parts should be carried out in the specified area. The hardness tester can be tested by Rockwell hardness tester. The hardness value of HRC is tested. For example, the hardness of heat treatment layer is relatively shallow, and the surface Rockwell hardness tester can be used to test the HRN hardness value.
4, The heat treatment of surface quenching is usually carried out in the manner of induction heating or flame heating. The main technical parameters are surface hardness, local hardness and the depth of the effective hardened layer. The hardness tester can be used by the Vivtorinox hardness tester, or the Rockwell or surface Rockwell hardness tester. The selection of the test force (scale) is related to the depth of the effective hardening layer and the surface hardness of the workpiece. Here are three kinds of hardness tester. Vivtorinox hardness tester is an important measure to test the hardness of workpiece surface. It can choose 0.5 ~ 100kg test force to test the surface hardened layer from 0.05mm to thickness. The accuracy is the highest, and it can distinguish the tiny difference of workpiece surface hardness. In addition, the effective hardened layer depth is also determined by Vivtorinox hardness tester. Therefore, it is necessary to set up a Vivtorinox hardness tester for surface heat treatment or surface heat treatment units.
5, the surface Rockwell hardness tester is also very suitable for testing the hardness of the surface quenched workpiece, the surface Rockwell hardness tester has three kinds of scale can be selected. A variety of surface hardening workpieces with an effective hardening depth of more than 0.1mm can be tested. Although the accuracy of surface Rockwell hardness tester is not as high as that of Vivtorinox hardness tester, it has been able to meet the requirements of quality management and qualification inspection as heat treatment plant. Besides, it also has the characteristics of simple operation, convenient operation, low price, fast measurement and direct reading of hardness value. Surface Rockwell hardness tester can be used for rapid and nondestructive detection of batch surface heat treatment parts. This is of great significance for metal processing and machinery manufacturing plants. The Rockwell hardness tester can also be used when the hardened layer of surface heat treatment is thicker. When the thickness of the hardened layer is from 0.4 to 0.8mm, the HRA scale can be used. When the thickness of the hardened layer exceeds 0.8mm, the HRC scale can be used.
6, the three hardness values of Vivtorinox, Rockwell and surface Rockwell can be easily converted to each other to be converted into a standard, a drawing, or a hardness value required by the user. The corresponding conversion tables have been given in the international standard ISO, the American Standard ASTM and the Chinese standard GB/T.
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