Alloyed case hardening steel for the parts which require core tensile strength and high hardness. Susceptible to the large seized parts with high wearing resistance and loading such as: gears, screws, camshafts, bushings.
TECHNOLOGICAL INFORMATION:
Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)
SEMI-FINISHED PRODUCTS:
Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
Ni
B
0,15 – 0,21
Max 0,40
0,50 – 0,90
Max 0,025
Max 0,035
1,50 – 1,80
0,25 – 0,35
1,40 – 1,70
-
MECHANICAL PROPERTIES:
Hardness after
Symbol
Value
Soft annealing (+A)
HB
≤ 229
Heat treatment (carburising, quenching and tempering) (+QT)
HRC
≥ 60
Ultimate tensile strength Rm, after quenching and tempering at 200 °C:
Diameter, d, mm
d ≤ 16
16 < d ≤ 40
40 < d ≤ 100
Rm, MPa
1160
1080
900
PHYSICAL PROPERTIES:
Property
Unit
Value
Density, ρ
g·cm-3
7.85
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
+
1150 – 850
Rolling
+
1150 – 850
Thermochemical treatment
Carburising
+
880 – 980
Carbonitriding
+
860 – 950
Heat treatment
Annealing
Normalising
+
830 – 870
Soft annealing
+
650 – 700
Heat treatment after carburising1)
Core hardening
+
830 – 870
Intermediate annealing
+
630 – 650
Case hardening
+
780 – 820
Tempering
+
150 – 200
1) If possible, hardening has to be performed with the temperature equal or close to the heat treatment temperature
INTERNATIONAL STEEL GRADES:
ISO
CEN
Russia
~18CrNiMo7
ISO 683-11:1987
18CrNiMo7-6
EN 10084:1998
–
–
US
Japan
China
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