Steel with high level of machinability used for pressure mould and stamping die bases, gauges etc.
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
W
V
Co
Ni
0,35-0,45
0,30-0,50
1,40-1,60
Max 0,030
0,050-0,100
1,80- 2,00
0,15- 0,25
-
-
-
-
MECHANICAL PROPERTIES:
Hardness after
Tempering ºC
Symbol
Value
Soft annealing
–
HB
≤230
Quenching with 860 ºC in oil
–
HRC
54
Quenching with 860 ºC in oil and tempering
100
HRC
≥53
200
HRC
52
300
HRC
50
400
HRC
47.5
500
HRC
43
600
HRC
36
700
HRC
30
PHYSICAL PROPERTIES:
Property
Unit
Value
Density, ρ
g*cm-3
7.85
Thermal expansion, α20-100ºC)
K-1
12.8*10-6
Thermal conductivity, λ20ºC)
W*m-1*K-1
34
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1050-850
Rolling
+
1050-850
Heat treatment
Toughening
Quenching
+
840-880
Normalisation
+
850-900
Tempering
+
600-680
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Soft annealing
+
700-740
Stress relieving
+
550-630
Thermochemical treatment
Nitriding
+
480-570
Other
–
–
INTERNATIONAL STEEL GRADES:
WERKSTOFF
Germany (DIN)
ANFOR
1.2312
–
40CrMnMoS8-6
–
40CMD8S
US
Russia
China
~P20+S
ASTM A 681-08
40X2ГМ-У
–
–
–
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