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| Generally Inner & Outer ring and Steel
Ball are made of GCr15, whose chemical composition is as following: |
| Steel No. |
Chemical Composition(%) |
| GCr15 |
C |
Si |
Mn |
P |
S |
Cr |
| 0.95-0.15 |
0.15-0.35 |
0.25-0.45 |
<=0.025 |
<=0.025 |
1.40-1.65 |
| The contrast of Bearing Steel No. of each
country is as following: |
| |
CHINA |
JAPAN |
AMERICA |
GERMANY |
FRENCH |
| Bearing Steel |
(GB)GCr15 |
(JIS)SUJ2 |
(AISI)52100 |
(DIN)100Cr6 |
(NF)100C6 |
| Stainless Steel |
(GB)9Cr18 |
(JIS)SUS440C |
(AISI)440C |
(DIN)WNr4535 |
(NF)Z100CD17 |
According to the International Standard,
the Accuracy of Bearing can be divided into five grades: Normal
Grade 0, High Grade 6, Accurate Grade 5, Over Accuracy Grade
4.
The Contrast of Bearing Accuracy is as following: |
| Country |
Standard |
Accuracy
Grade |
| China |
GB/T307 |
0 |
6 |
5 |
4 |
| International Standard Organization |
ISO |
0 |
6 |
5 |
4 |
| Sweden |
SKF |
P0 |
P6 |
P5 |
P4 |
| Germany |
DIN |
P0 |
P6 |
P5 |
P4 |
| Japan |
JIS |
P0 |
P6 |
P5 |
P4 |
| American |
ANSI |
ABEC-1 |
ABEC-3 |
ABEC-5 |
ABEC-7 |
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