Brinell Hardness Testing Machine Diagram

Book brinell testing which calls for a 12 6 kilogram load but is useful and convenient because of the widespread availability of 15 kg loading devices.

Brinell hardness testing machine diagram.

For softer materials there are alternate scales using a 1500 kg or 500 kg load to avoid excessive indentation. It is used when the surface of the metal is very rough to use another hardness test on it. The brinell hardness test is not suitable for very hard materials or hardened surface layers because the ball does not penetrate sufficiently into the material. A brinell hardness result measures the permanent width of indentation produced by a carbide indenter applied to a test specimen at a given load for a given length of time.

Diagram of brinell hardness testing machine. There are two methods to perform the brinell hardness test on the metal as. A 10mm ball with an applied load of 3 000 kgf is most common for brinell testing. Test forces range from 500 to 3000 kgf.

Relatively high loads are applied to parts via a tungsten carbide ball in this method. Samples are mounted in thermosetting plastic and ground and polished by the methods described in section 4 4 3. An efficient vickers knoop and brinell automatic hardness tester offering micro macro and universal testing in one machine. Relation diagram for specimen hardness and.

Unlike with rockwell testing brinell tests measure the diameter of the indentation made by the ball not the depth. Duramin 150 an entry level rockwell automatic hardness tester for high accuracy and a short cycle time. Brinell hardness testing is particularly suitable for thicker heterogeneous materials in the low to medium hardness range. A rockwell superficial hardness machine is used to conveniently provide.

Proposed by swedish engineer johan august brinell in 1900 it was the first widely used and standardised hardness test in engineering and metallurgy the large size of indentation and possible damage to test piece limits its usefulness. Brinell hardness test bhn the brinell hardness test consists of indenting the test material with a 10mm diameter hardened steel or carbide ball subjected to a load of 3000 kg. However it also had the useful feature that the hardness value divided by two gave the approximate uts in ksi for steels. One of the most popular hardness testing methods brinell hardness number is obtained using a perfectly spherical hardened steel ball of 10 mm pressed against the test surface using a static force of 3000 kg 29 42 kilonewton for at least 10 seconds for steel and measuring.

A chart is then used to convert the averaged diameter measurement to a brinell hardness number. Practical hardness testing made simple 9 3. Brinell hardness test is one of the most important hardness tests in the engineering industry and metallurgy.