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.
Brinell hardness testing machine diagram.
Brinell hardness testing is particularly suitable for thicker heterogeneous materials in the low to medium hardness range.
Practical hardness testing made simple 9 3.
There are two methods to perform the brinell hardness test on the metal as.
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.
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.
Test forces range from 500 to 3000 kgf.
Thin sheets cannot be tested with the brinell hardness test.
Unlike with rockwell testing brinell tests measure the diameter of the indentation made by the ball not the depth.
Relatively high loads are applied to parts via a tungsten carbide ball in this method.
However it also had the useful feature that the hardness value divided by two gave the approximate uts in ksi for steels.
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.
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.
It is used when the surface of the metal is very rough to use another hardness test on it.
Diagram of brinell hardness testing machine.
The sht series are the testing machines that provide a superb range of hardness standard.
For softer materials there are alternate scales using a 1500 kg or 500 kg load to avoid excessive indentation.
Brinell hardness test is one of the most important hardness tests in the engineering industry and metallurgy.
Relation diagram for specimen hardness and.
Vickers hardness standard testing machine sht 41 brinell hardness standard testing machine sht 5 and shore hardness standard testing machine sht 6.
A 10mm ball with an applied load of 3 000 kgf is most common for brinell testing.
Duramin 150 an entry level rockwell automatic hardness tester for high accuracy and a short cycle time.
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.
A rockwell superficial hardness machine is used to conveniently provide.
