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Bearing collar and roller material
The best material for rolling bearing is high carbon chromium bearing steel, which features desired hardness, strong rolling fatigue resistance, wearing resistance and stable dimension. Its chemical composition is:

Chemical composition of bearing steel GCr1
Element(wt%)
C
0.95-1.05
Cr
1.40-1.65
Si
0.15-0.35
Mn
0.25-0.45
P
0.027
S
0.02
Element(wt%)
Ni
<0.23
Cu
0.25
Mo
0.1
Sn
<0.03
As
<0.04
Ti
<0.005
Element(wt%)
Sb
<0.002
Pb
<0.002
O<0.001
Al
<0.05
Ca
<0.01
-

Corresponding designation equivalent GCr15
CHINA
ISO
USA
GERMANY
JAPAN
SWEDEN
GCr15
683/XV
52100
(ASTM)
100Cr6
(DIN)
SUJ2
(JIS)
SKF3

Staintess steel
Steel No.
Chemical composition%
C
Si
Mn
P
S
Cr
Mo
AISI-440C
0.95-1.2
<1.0
<1.0
<0.04
<0.03
16-18
<0.75