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I have read some pdf files and it says negative Rockwell hardness value is not used because of it would cause confusion.
What I currently know is :
HR(C/B) = N - h/s;
for C scale, N = 130; while for B scale N = 100;
s always = 0.002
and h is the permanent depth of the indentation.
I think these 2 addition question might related to the reason for not using negative value:
i) negative value means the indentation is like the indentation exceed 0.26mm for C scale,
0 > (130 - h/0.002); h bust be at lease 0.26mm, does this 0.26mm means anything significant?
ii) And i also read that 130 in C scale is the indicate infinite hardness, any simple way to explain why it is 130?
What I currently know is :
HR(C/B) = N - h/s;
for C scale, N = 130; while for B scale N = 100;
s always = 0.002
and h is the permanent depth of the indentation.
I think these 2 addition question might related to the reason for not using negative value:
i) negative value means the indentation is like the indentation exceed 0.26mm for C scale,
0 > (130 - h/0.002); h bust be at lease 0.26mm, does this 0.26mm means anything significant?
ii) And i also read that 130 in C scale is the indicate infinite hardness, any simple way to explain why it is 130?