Steel susceptible to tools and measuring tools which are resistant to abrasion, guide strips, ejector pins, gauges; cutting, punching, stamping tools; long screw taps, threading dies, screw cutting jaws, broaches, circular cutters for paper and leather, cutting plates with complex shapes for blanking dies, wood processing mills, reamers, measures tools etc.
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
W
V
Co
Ni
0,85-0,95
0,10-0,40
1,80-2,20
Max 0,030
Max 0,030
0,20-0,50
-
-
0,05-0,20
-
-
MECHANICAL PROPERTIES:
Hardness after
Tempering ºC
Symbol
Value
Soft annealing
–
HB
≤229
Quenching with 790 ºC in oil
–
HRC
65
Quenching with 790 ºC in oil and tempering
180
HRC
≥60
200
HRC
61.5
250
HRC
59.5
350
HRC
57
400
HRC
54
450
HRC
51
500
HRC
48
550
HRC
44
PHYSICAL PROPERTIES:
Property
Unit
Value
Density, ρ
g*cm-3
7.85
Thermal expansion, α20-100ºC)
K-1
11.7*10-6
Thermal conductivity, λ20ºC)
W*m-1*K-1
25
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1000-850
Rolling
+
1000-850
Treatment
Heat treatment
Quenching
+
780-800
Tempering
+
170-190
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Soft annealing
+
680-700
Stress relieving
+
600-680
Thermochemical treatment
Nitriding
–
–
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
CEN
Russia
90MnCrV8
ISO 4957:2004
90MnCrV8
ISO 4957:2004
9G2F
GOST 5950-73
US
Japan
China
O2
ASTM A 681-91
–
–
9MnV
GB 1299-85
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