HYDROK – Safety
Workpiece materials
Specific
cutting
forces kc
[N/mm²] at
f=0,1mm
7,8,9
Specific
cutting forces
kc [N/mm²] at
f=0,5mm
10,11
Specific
cutting forces
kc [N/mm²] at
f=1,0mm
12,13
Gray cast iron
e.g. EN-GJL-250
1980
1260
900
Nodular cast iron
[unhardened]
e.g. EN-GJS-400-15
2120
1190
1060
Unalloyed/low-alloy
construction steels [with
average strength] / case-
hardened steels
[unhardened]
For example:
S235JR [1.0037]
S275JR [1.0044]
Ck10 [1.1121]
16MnCr5 [1.7131]
18CrNi8 [1.5920]
2920
1840
1500
Unalloyed/low-alloy
construction steels
[unhardened, with high
strength]
S355J2G3 [1.0570]
E360 [1.0070]
3350
2000
1600
Heat-treated steels
[prehardened]
C45 [1.0503]
C60 [1.0601]
42CrMo4 [1.7225]
34CrNiMo6 [1.6582]
2850
1960
1660
Unalloyed/low-alloy tool
steels [unhardened]
C105W1 [1.1545]
3100
2100
1690
Machining steels
35S20 [1.0726]
60S20 [1.0728]
1700
1480
1400
Stainless steels
3600
2450
2100
Hardened steels
4800
Aluminum wrought-alloy
<16%Si
1340
900
750
Aluminum cast-alloy
<16%Si
1520
1000
850
Brass
1300
850
700
Table 4: Specific cutting forces kc / [N/mm
2
]
7 For feeds, between 0.1 and 0.5 mm you must interpolate.
For feeds >0.5 mm, the values of column f=0.5 mm must be used.
8 For drilling operations with double-edged tools f=fn/2 applies
9 For feeds, between 0.05 and 0.1 mm the value at f=0.1 with 20% contingency must be used.
10 For feeds, between 0.1 and 0.5 mm you must interpolate.
For feeds >0.5 mm, the values of column f=0.5 mm must be used.
11 For drilling operations with double-edged tools f=f
n
/2 applies
12 For feeds, between 0.5 and 1.0 mm you must interpolate.
13 For drilling operations with double-edged tools f=f
n
/2 applies
Order h49 7144.907-333
27
