Steel susceptible to different types of springs ( up to 6 mm ) as leaf springs, helical springs and coil springs etc.
CHEMICAL COMPOSITION:
C
Mn
Si
P
S
Cr
Ni
Mo
W
V
Ti
Cu
Inne
0,52 - 0,60
0,60 - 0,90
1,60 – 2,00
Max 0,025
Max 0,025
0,9-1,2
Max 0,40
Max 0,10
-
-
-
-
-
MECHANICAL PROPERTIES:
Mechanical properties after the process of annealing or annealing and rolling for the product with thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
After heat treatment
Ultimate tensile strength
Rm
MPa
≤ 600
Yield stress
Re (Rp0,2)
MPa
≥ 740
Elongation
A
%
≥ 12
Percentage reduction of area
Z
%
–
Hardness
HV
HV
≤ 230
Mechanical properties after the process of cold rolling for the product thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
Value
Tensile strength
Rm
MPa
–
Hardness
HV
HV
–
Mechanical properties after the process of toughening for the product thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
Value
Ultimate tensile strength
Rm
MPa
1200 – 1700
Hardness
HV
HV
370-520
Effect of the cross-section on mechanical properties after the process of toughening
Thickness, mm
0.3 ≤ 0.5
0.5 ≤ 0.75
0.75 ≤ 1
1 ≤ 1.5
1.5 ≤ 2
2 ≤ 3
Hardness HV
485-535
465-515
455-505
445-495
425-475
415-465
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
–
–
Rolling
+
(900 – 830)
Treatment
Heat treatment
Quenching
+
840-870/w,o
Tempering
+
430 – 500
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Normalising
+
(850 – 880)
Soft annealing
+
(640 – 680)
Thermochemical treatment
Carburising
–
–
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
European Union
Russia
~59Si7
ISO 683-14: 1992
56Si7
EN 10132-4: 2000
~ 55S2
GOST 14959 1979
US
Japan
China
~9255
ASTM A 29-99
–
–
~55Si2Mn
GB 1222-84
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