 |
Main
workpiece material groups and their
characteristic letters |
Brinell
hardness
HB |
R331
f = mm/dev |
| Workpiece
material |
0.4-0.8

|
0.25-0.4

 |
0.05-0.25

 |
| P |
Unalloyed
steel 1) |
ca
0.15 % C annealed |
125 |
120-150 |
170-210 |
240-300 |
| ca
0.45 % C annealed |
190 |
100-130 |
150-180 |
210-255 |
| ca
0.45 % C hardened and temp. |
250 |
80-120 |
130-160 |
170-220 |
| ca
0.75 % C annealed |
270 |
70-100 |
110-140 |
130-185 |
| ca
0.75 % C hardened and temp. |
300 |
60-90 |
90-120 |
120-160 |
|
Low-alloy steel 1) |
annealed |
180 |
100-130 |
160-200 |
195-240 |
| hardened
and temp. |
275 |
80-110 |
140-180 |
160-210 |
| hardened
and temp. |
300 |
70-100 |
120-160 |
130-185 |
| hardened
and temp. |
350 |
60-80 |
90-100 |
110-145 |
| High-alloy
steel and High-alloy tool steel
1) |
annealed |
200 |
80-110 |
130-160 |
155-215 |
| hardened
and temp. |
325 |
70-90 |
110-140 |
110-170 |
| Stainles
steel 1) |
ferritic/martensitic,annealed |
200 |
100-130 |
140-160 |
160-210 |
| martensitic,
hardened and temp. |
240 |
90-110 |
120-140 |
130-180 |
| M |
Stainles
steel 1) |
austenitic
2) |
180 |
80-100 |
110-150 |
120-180 |
| K |
Grey
cast iron |
perlitic/ferritic |
180 |
|
|
|
| perlitic
(martensitic) |
260 |
|
|
|
| Nodular
graphite cast iron |
ferritic |
160 |
|
|
|
| perlitic |
250 |
|
|
|
| Malleable
cast iron |
ferritic |
130 |
|
|
|
| perlitic |
230 |
|
|
|
| N |
Aluminium
wrought alloys |
unhardenable |
60 |
|
|
|
| hardenable/hardened |
100 |
|
|
|
| Aluminium
cast alloys |
<=
12% Si. unhardenable |
75 |
|
|
|
| <=
12% Si. hardenable/hardened |
90 |
|
|
|
| >12%
Si. unhardenable |
130 |
|
|
|
| Copper
and copper alloys (Bronze-Brass) |
free
cutting alloys Pb>1% |
110 |
|
|
|
| brass,
red bronze |
90 |
|
|
|
| bronze,
non leaded copper and electrolitic
copper |
100 |
|
|
|
| Nonmetallic
materials |
Duroplastics
fibre reinforced plastics |
|
|
|
|
| Hard
rubber |
|
|
|
|
| S |
Heat
resistant alloys |
Fe-based
Ni or
Co-based |
annealed |
200 |
|
|
|
| hardened |
280 |
|
|
|
| annealed |
250 |
|
|
|
| hardened |
350 |
|
|
|
| cast |
320 |
|
|
|
| Titanium
alloys |
Pure
titanium |
Rm
3)400 |
|
|
|
| Alpha
and Beta alloys hardened |
Rm
3)1050 |
|
|
|
| H |
Hardened
steel |
hardened
and temp. |
55HRC4) |
|
|
|
| hardened
and temp. |
60HRC4) |
|
|
|
| Hardened
steel |
cast |
400 |
|
|
|
| Hardened
cast iron |
hardened
and temp. |
55HRC4) |
|
|
|