Steel susceptible to die inserts for presses and upsetting machines, forging dies, hot shear knives, punches, anvils for large-size and deep-impression hammers and presses, hammer dies with average dimensions, backing plates, die holders, hot punching tools.
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
W
V
Co
Ni
0,5-0,6
0,10-0,40
0,60 - 0,90
MAX 0,03
MAX 0,03
0,80-1,20
0,35-0,55
-
0,05-0,15
-
1,50-1,80
MECHANICAL PROPERTIES:
Hardness after
Tempering ºC
Symbol
Value
Soft annealing
–
HB
≤248
Quenching with 850 ºC in oil
–
HRC
60
Quenching with 850 ºC in oil and tempering
(cooling during quenching can be in the forced air or polymer)
500
HRC
42
350
HRC
52.5
400
HRC
51
450
HRC
49
500
HRC
47
550
HRC
44.5
600
HRC
42
PHYSICAL PROPERTIES:
Property
Unit
Value
Density, ρ
g*cm-3
7.85
Linear expansivity, α20-100ºC)
K-1
12*10-6
Specific thermal conductivity, λ20ºC)
W*m-1*K-1
34
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1100-850
Rolling
+
1100-850
Treatment
Heat treatment
Quenching
+
840-890
Tempering
+
500-600
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Soft annealing
+
650-680
Stress relieving
+
600-650
Thermochemical treatment
Nitriding
–
–
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
CEN
Russia
55NiCrMoV7
ISO 4957:2004
55NiCrMoV7
ISO 4957:2004
~5HNM
GOST 5950-73
US
Japan
China
~L6
ASTM A 681-91
~SKT 4
JIS G 4404-1983
~5CrNiMo
GB 1299-85
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