Steel susceptible to hot pressing tools exposed to severe stresses in contact with die inserts. Tools for high-speed shears (automatic machines and upsetting machines) for hot upsetting and press moulding of nuts, mandrels, stamps, punching tools, bolt heads, pins and rivets and tools for hot forging of rolling bearing rings.
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
W
V
Co
Ni
0,30-0,40
0,30-0,60
0,25-0,50
Max 0,030
Max 0,030
2,50-3,00
2,50-3,00
Max 0,30
0,40-0,60
2,80-3,30
-
MECHANICAL PROPERTIES:
Hardness after
Tempering ºC
Symbol
Value
Soft annealing
–
HB
≤241
Quenching
–
HRC
53.5
Quenching and tempering
300
HRC
51.5
350
HRC
51.5
400
HRC
52
450
HRC
52.5
500
HRC
53
550
HRC
53.5
600
HRC
51.5
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1100-850
Rolling
+
1100-850
Treatment
Heat treatment
Quenching
+
1020-1040
Tempering
+
500-600
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Soft annealing
+
740-770
Stress relieving
+
600-700
Thermochemical treatment
Nitriding
+
470-550
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
CEN
Russia
–
–
–
–
–
–
US
Japan
China
–
–
–
–
–
–
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