From a worldwide perspective, Brinell hardness tester is a commonly used material hardness test instrument, mainly used for the hardness test of forged steel and cast iron with uneven microstructure. Brinell hardness test equipment can be specifically subdivided into portable Brinell hardness tester, desktop, and large bridge Brinell hardness tester. The brinell hardness testing machine produced by Shenyang TX Testing Instruments Company belongs to portable Brinell hardness tester.
Brinell hardness tester is mainly used to measure the hardness of cast iron, steel, non-ferrous metals and soft alloys.
Rockwell hardness tester is mainly used to measure the hardness of metals and hard materials, such as steel, tungsten steel, tin bronze and so on.
The Brinell hardness test method is to press the cemented carbide ball with a certain diameter into the surface of the sample under the action of the specified detection force, measure the surface diameter of the imprint, and calculate the hardness value of the work piece according to the indentation diameter.
Unlike brinell hardness testing machine, rockwell tester for sale is to use 120°diamond cone, quenched steel ball and cemented carbide ball (with specified diameter) as indenter, press it into the surface of the tested material under a certain load, and calculate the hardness of the material from the depth of indentation.
Due to the difference in principle, the hardness range of this handheld hardness tester is limited, and it is generally used to test the hardness of materials below 500HB. Rockwell hardness tester is suitable for higher hardness range, up to 70HRC.
The method to use Brinell hardness test equipment by TX, an experienced hardness tester factory, is to press a certain diameter of hardened steel ball or carbide ball, into the metal surface to be measured with a specified size of test force. Maintain this force for the specified time, and then remove it.
Utilize a reading microscope or Brinell indentation measurement system to measure the indentation diameter of the tested surface, thereby the Brinell hardness testing machine obtaining the Brinell hardness value directly.
After testing by Brinell testing machine, look up the conversion table to get the Brinell hardness value if used the reading microscope. The Brinell hardness is calculated by the quotient of the test force divided by the indentation surface area.
Before the Brinell hardness test, make sure that the surface of the workpiece to be tested has a plane large enough for the indenter of the Brinell hardness tester to press vertically into the plane. Then the test force is applied normally for routine measurement.
It is performed by portable brinell hardness testing machine through using an indenter to apply test force to the surface of the metal material, holding some seconds and then remove the test force. The ratio of the test force to the indentation surface area is the Brinell hardness value.
Brinell hardness test is widely used to test the hardness of metal materials. It can reflect the compressive capacity, wear resistance and strength of the material, which is of great significance for the quality control and material selection.
Because the indentation obtained by Brinell hardness testing method is large, its hardness value through portable brinell hardness tester is less affected by the uneven composition of the tested sample, the dispersion of the test results is small, and the reproducibility is good, which can well reflect the real hardness value of the material.
In industrial production, the Brinell hardness value of workpieces shall be tested strictly by brinell hardness testing machine in accordance with ASTM and ISO standards.
Generally, the ambient temperature during testing should be between 10℃ and 35℃.
For the selection of test force and indenter diameter in Brinell hardness testing, please choose according to the relevant provisions of ASTM and ISO.
Before the test, the surface of the sample should be smooth, free of oxides and other dirt.
Because portable Brinell hardness testers typically use cemented carbide balls with larger diameters and higher load forces to measure the hardness of Brinell, the surface area of spherical indentation is generally larger, so that the Brinell hardness value has a good overall representation and will not be affected by the individual structure of the work piece to be measured. Because the indentation produced during Brinell hardness testing is large, it is not suitable for measuring the work piece that is too thin, and it will leave a permanent indentation on the surface of the work piece after testing, which is destructive testing, so the work piece with special requirements is not suitable for this testing method.
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