Steel susceptible to steel for small cross-section springs and leaf springs, spring with low hardenability
CHEMICAL COMPOSITION:
C
Si
Mn
P
S
Cr
Mo
Ni
B
0,62-0,70
0,17-0,37
0,90-1,2
-
-
Max. 0,25
-
-
-
MECHANICAL PROPERTIES:
Unit
Value
Hardness after thermal treatment
HB
Max. 241
Quenching in oil
Temperature
830 °C
Tempering
Temperature
470 °C
Yield stress
Re (Rp0.2), MPa
Min. 785
Ultimate tensile strength
Rm MPa
Min. 980
Elongation
A, %
Min. 8
Reduction of area
Z, %
Min. 30
Impact energy
KV, J
–
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
+
800 – 1180
Rolling
+
850 – 1180
Heat treatment
Annealing
Normalising
+
810 – 830
Soft annealing
+
640 – 680
Heat treatment after carburising1)
Quenching
+
810 – 830
Tempering
+
640 – 680
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