Hardness Testing
Hardness Testing
(OP)
When using a telebrineller it is recommended that the bar hardness be within 30 BHN of the expected material hardness. If there is a difference of 60 BHN between the bar and the test results would you expect the actual hardness of the material to be higher or lower than the test results?





RE: Hardness Testing
RE: Hardness Testing
RE: Hardness Testing
I wouldn't trust the results of the telebrineller to be within 30 points of the actual hardness so it would be hard for me to believe you could tell if you were within 30 points of the test bar or not.
If your telebrineller is telling you your piece is 190 BHN, I'd believe it is pretty soft, but if the material had to be less than 22 HRC (generally accepted to be 235 BHN), I think I'd have to find another hardness tester before I could accept it.
rp
RE: Hardness Testing
RE: Hardness Testing
From my experience, the 190 BHN hardness of the part measured using the 262 BHN test bar would normally increase if you retested with a 200 BHN test bar.
RE: Hardness Testing