Characteristics of the material 55KHGR ( 55HGR, 55ХГР ).
Material :
55KHGR ( 55HGR, 55ХГР )
Classification :
Spring structural steel
Chemical composition in % of the material 55KHGR ( 55HGR, 55ХГР ) .
C
Si
Mn
Ni
S
P
Cr
Cu
B
0.52 - 0.6
0.17 - 0.37
0.9 - 1.2
max 0.25
max 0.035
max 0.035
0.9 - 1.2
max 0.2
0.001 - 0.003
Temperature of critical points of the grade 55KHGR ( 55HGR, 55ХГР ).
Ac1 = 750 , Ac3(Acm) = 790 , Mn = 260
Mechanical properties under Т=20oС of the material 55KHGR ( 55HGR, 55ХГР ) .
Assortment
Dimension
Direct.
sв
sT
d5
y
KCU
Heat treatment
-
mm
-
MPa
MPa
%
%
kJ / m2
-
1270
1175
7
35
Guenching 850oC, oil, Drawing 470oC,
Brinell hardness of the material 55KHGR ( 55HGR, 55ХГР ) ,
HB 10 -1= 269 - 302 MPa
Specification :
Mechanical properties :
sв
- Tensile strength , [MPa]
sT
- Yield stress, [MPa]
d5
- Specific elongation at fracture , [ % ]
y
- Reduction of area , [ % ]
KCU
- Impact strength , [ kJ / m2]
HB
- Brinell hardness , [MPa]
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