The cemented carbide has a series of excellent performance such as high hardness, strong toughness, wear resistance, heat resistance, corrosion resistance, high-temperature resistance, is known as “industrial teeth”, mostly used to make metal cutting tools, wear parts, etc. Widely used in military, aerospace, machining, metallurgy, oil drilling, mine tools, electronic communications, construction, and other fields.
The hardness of cemented carbide is generally tested by Rockwell hardness (HRC). Rockwell hardness is an index to determine the hardness value based on the indentation plastic deformation depth, with 0.002 mm as a hardness unit. In the Rockwell hardness test, using different indenters and different test forces will produce different combinations, corresponding to different scales of Rockwell hardness. The three most commonly used scales are a, B and C, namely HRA, HRB and HRC:
HRA is the hardness obtained by 60kg load and diamond cone indenter, which is used for materials with higher hardness. For example steel sheet, cemented carbide.
HRB is the hardness obtained by using 100kg load and 1.5875mm diameter hardened steel ball, which is used for low hardness materials. For example mild steel, non-ferrous metals, annealed steel, etc.
HRC is the hardness obtained by 150kg load and diamond cone indenter, which is used for materials with higher hardness. For example quenched steel, cast iron, etc.
The hardness of cemented carbide is mainly tested by Rockwell hardness tester. PHR Series Portable Rockwell hardness tester is very suitable for testing hardness of cemented carbide. The weight precision of the instrument is the same as that of the table Rockwell hardness tester, so it is very convenient to use and carry.
It belongs to non-destructive test, and the test method is relatively simple. The hardness test of cemented carbide has strong adaptability to the shape and size of the specimen, and the test efficiency is high.
PHR Series Portable Rockwell hardness tester can test hard alloy workpieces with thickness or diameter less than 50 mm, hard alloy workpieces with diameter less than 2.0mm and tubular hard alloy workpieces with inner diameter less than 30mm.
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