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Two major reasons to do hardness testing for metal materials: a, to verify the heat treatment of a part and to determine if a material has the properties necessary for its intended use; b, to determine the characteristics of materials whether qualified in industrial and R&D applications. Features of ... Read More
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Knoop hardness test usually refers to static indentations made with loads not exceeding 1 kgf. The indenter is Knoop elongated diamond pyramid. The procedure for testing is very similar to that of the standard Vickers hardness test, except that it is done on a microscopic scale with higher precision ... Read More
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The Vickers hardness test method consists of indenting the test material with a diamond indenter, in the form of a right pyramid with a square base and an angle of 136 degrees between opposite faces subjected to a load of 1 to 100 kgf. The full load is normally applied for 10 to 15 seconds. The two ... Read More
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The thickness of the specimen tested shall be such that no bulge or other marking showing the effect of the test force appears on the side of the piece opposite the indentation. The thickness of the material under test should be at least ten times the depth of the indentation, below table can also ... Read More
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Brinell Hardness Scale is the combinations of indenters and test forces. The standard Brinell hardness scales and test forces are given in below table, corresponding to force-diameter ratios of 1, 1.25, 2.5, 5, 10 and 30. Brinell hardness values should be determined and reported in accordance with ... Read More
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The Brinell hardness test method consists of indenting the test material with a 10 mm diameter hardened carbide ball subjected to a load of 3000 kg. For softer materials the load can be reduced to 1500 kg or 500 kg to avoid excessive indentation. The full load is normally applied for 10 to 15 ... Read More
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The Rockwell test consists of measuring the additional depth to which a carbide ball or diamond penetrator is forced by a heavy (major) load beyond the depth of a previously applied light (minor) load (SET point). The minor load is applied first and a SET position is established on the dial gauge or ... Read More
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Standardized Rockwell test blocks shall be used in the appropriate hardness ranges for each scale to be verified. These ranges are given in below table. Hardness measurements shall be made only on the calibrated surface of the test block. Note A: The user may find that high, medium and low range ... Read More
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The Rockwell hardness scales are defined by the combinations of indenter and test forces that may be used. The standard Rockwell hardness scales and typical applications of the scales are given in below tables. Rockwell hardness values shall be determined and reported in accordance with one of these ... Read More
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For any given thickness, the indicated Rockwell hardness is the minimum value acceptable for testing. For a given hardness, material of any greater thickness than that corresponding to that hardness can be tested on the indicated scale. Note A: These approximate hardness numbers are for use in ... Read More
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