Material hardness (before and after heat treatment)

A.Material Hardness Values

Hardness
Value HRC
Hardness
value HRB
Hardness
Value
Vickers
Hardness
Value
Brinnell
N/mm2Symbols DIN
-2067114114400C15
-974131131460C10
183154156560C40stainless 303
1090183182635
1593199200680C5542CrMo432CrMo12
209722122476034CrNiMo6 14NiCr14
2510125024985034CrNiMo6 pretreated
30105278276955
351093203231110
401123853701270
451154604271453 C40
hardened
50118535497167034CrNiMo6
hardened
32NiCrMo45
hardened
42CrMo4 hardened
556395451870C35 hardened
576945761940
60746601211014NiCr14
hardened
C10
hardened
63867652222032CrMo12
nitrited
659406822300
6710607252400
7011707602640

B. Material Hardness (Heat Treatment)

The following table shows the different processes used in the heat treatment of
Material
Carburizing
Hardening
temperature
Quenching
method
Hardness
level
obtained
Tempering
Quenched
C40830/860°C
Hold at 210 to 230°C
in an oil bath for
1h/25 mm
40-45 HRc
Hold at 650°C
+ Cool for one hour
in an oven or in the open air
C55810/840°C
Hold at 210 to 230°C
in an oil bath for
1h/25 mm
40-45 HRc
Hold at 650°C
+ cool for one hour
in an oven or in the open air
42CrMo4860/890°C
Hold at 210 to 230°C
in an oil bath for
1h/25 mm
40-45 HRc
Hold at 690°C
+ cool for one hour
in an oven or in the open air
34CrNiMo6820/850°C
Hold at 180à200°C
in an oil bath for
1h/25 mm
40-45 HRc
Hold at 650°C
+ cool for one hour
in an oven or in the open air
Cementation
C10<Ø100
Hold at
900 to 930°C
for 1h
cementation depth 0,2mm
770/790°C
Hold at
150 to 200°C
in an oil bath
1h/25 mm
55-60 HRc
Hold at 650°C
+ cool for one hour
in an oven or in the open air
C10>Ø100
Hold at
900-930°C
for 1h
cementation depth 0,2mm
900/930°C
Hold at 150 to 200°C
in an oil bath
1h/25 mm
57-62 HRc
Hold at 650°C
+ cool for one hour
in an oven or in the open air
12NiCr14
Hold at 900-930°C
for 1h
cementation depth 0,2mm
820/840°C
Hold at 150 to 200°C
in an oil bath
1h/25 mm
57-62 HRc
Hold at 650°C
+ cool for one hour
in an oven or in the open air
*Do not stock or use at temperatures between 250 and 450°C
All values are approximate

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