Steel susceptible to dies for forming plastic products, large injection moulds, large plastic moulds highly stressed in the core and pressure products, deeply machined tools etc.
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
W
V
Co
Ni
0,35-0,45
0,20- 0,40
1,30-1,60
Max 0,030
Max 0,030
1,80- 2,10
0,15-0,25
-
-
-
0,90- 1,20
MECHANICAL PROPERTIES:
Hardness after
Tempering ºC
Symbol
Value
Soft annealing
–
HB
≤235
Toughening
HB
300
Quenching with 860 ºC in oil
–
HRC
52
Quenching with 860 ºC in oil and tempering
(cooling during quenching can be performed gradually in the salt bath at 180–220 ºC and then cooled in the air)
200
HRC
51
300
HRC
48.5
400
HRC
46
450
HRC
44
500
HRC
42
550
HRC
38.5
600
HRC
33
PHYSICAL PROPERTIES:
Property
Unit
Value
Density, ρ
g*cm-3
7.85
Thermal expansion, α20-100ºC)
K-1
12.2*10-6
Thermal conductivity, λ20ºC)
W*m-1*K-1
36
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1050-850
Rolling
+
1050-850
Treatment
Heat treatment
Quenching
+
840-870
Tempering
+
500-650
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Soft annealing
+
710-740
Stress relieving
+
600-700
Thermochemical treatment
Nitriding
+
470-540
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
CEN
Russia
40CrMnNiMo8-6-4
ISO 4957:2004
40CrMnNiMo8-6-4
ISO 4957:2004
–
–
US
Japan
China
–
–
–
–
–
–
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