2018-07-23 12:07:38 SUSHI GUANGBO TEST TECHNOLOGY CO.,LTD 已读
Hardness testing is one of the most important indicators for testing material performance and one of the fastest and most economical methods. Hardness testing can reflect differences in chemical composition, texture, and processing. Often used as a means of supervision in all walks of life.
Rockwell hardness, Vickers hardness, micro Vickers hardness, Brinell hardness, Shore hardness, nanoindentation hardness, Shore hardness, etc.
Rockwell hardness has no unit and is a non-standard mechanical property index. The most commonly used hardness scales are A, B, C, R, M, L, etc., which are usually recorded as HRA, HRB, HRC, etc. Hardness data + hardness symbol, such as 50HRC.
ASTM E18, GB/T 230.1, ASTM D785, ISO 2039-2, GB/T 3398.2, etc.
The Vickers hardness is usually expressed as follows: 600 HV30/20, the value in front of V is the hardness value, and the latter is the test force. If the test force holding time is not the usual 10-15 seconds, it is necessary to mark the holding time after the test force value. Such as: 600HV30/20---With a test force of 30 kg force, hold for 20 seconds, and obtain a hardness value of 600.
The sign of Brinell hardness is indicated by HBS or HBW. Applicable to cast iron, non-ferrous alloys, various annealing and quenching and tempering steels, it is not suitable to measure specimens or workpieces that are too hard, too small, too thin and do not allow large indentations on the surface.
GB/T 4340.1, ISO 6507, ASTM E384, GB/T 231.1, ASTM E10, etc.