Steels used for bearing rings and balls must be cap able of being ade quately hardened and must have high fatigue strength and wear resistance. The structural and dimensional stability of the bearing components must be satisfactory at the operating temperatures which can be expected.
The standard material for bearing rings and balls is vacuum degassed high carbon chromium steel allowing high carbon chromium steel allowing high quality consistency and long bearing service life, material symbol as per china Standard is GCr15. (Table 1, Table 2)
Material symbol conversion <Table 1>
Material
GB
Equivalents
(GHINA)
AISI/SAE(USA)
DIN(GERMANY)
JIS(JAPAN)
High Carbon Chrome
Steel
Gcr15
SAE52100
100Cr6
SUJ2
Cage (Retainer)
The main purpose of the cage is to keep the balls at an appropriate distance from each other and to prevent immediate contact between two neighboring balls in order to keep friction and thus heat generation at a minimum.
The type and application of cages <Table 3>
Type
Structure
Application
One-piece Steel Crown
Type
Stainless steel cage, suitable
for low torque, low speed application
One-piece Nylon Crown
type
Suitable for high speed
application
Two-piece Steel Ribbon
Type
General purpose
Two-piece Steel Rivet
Type
Suitable for small (not
miniature) ball bearing with a high
load
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