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USER GUIDE
MATERIAL GROUPS
Based on ISO 513 and VDI 3323 Standards
ISO Material Condition Kc1 [N/mm ] Mc (2) Hardness HB Material Group No.
(1)
2
not hardenable 700 0.25 60 21
aluminum-wrought alloys
hardenable 800 0.25 100 22
not hardenable 700 0.25 75 23
≤12% Si
aluminum-cast alloys hardenable 700 0.28 90 24 TECHNICAL INFORMATION
>12% Si high temperature 750 0.25 130 25
N
>1% Pb free cutting 700 0.27 110 26
copper alloys brass 700 0.27 90 27
electrolytic copper 700 0.27 100 28
duroplastics, fiber plastics 200 0.20 70 shore D 29
non metallic
hard rubber 200 0.20 55 shore D 30
non-ferrous metals
(1) Specific cutting force for 1 mm 2 chip section
(2) Chip thickness factor
MATERIAL GROUPS
Hardness Conversion Table
N/mm 2 Kpsi
80 560
80 560
200 100 700
100 700
120 840
120 840
140 980
140 980
300
160 1120
160 1120
180 1260
180 1260
200 1400
400 200 1400
220 1540
220 1540
240 1680
240 1680
brinell hardness (HB) 260 1820
1820
260
500
280
1960
280
1960
300
2100
2100
300
600
2240
320
320 2240
700
tensile strength
10 20 30 40 50 60 70
rockwell “C” hardness (HRC)
159
