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Material

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The right choice of the bearing material is decisive for the operating reliability and performance of the bearing. The hardenability of the rings and rolling elements is a very important aspect for choosing the bearing material as it determines the bearing‘s load capacity and fatigue strength.

The material used for the rings and rolling elements is a low-alloy, through hardening chromium steel of high purity.

The standard material used for rings and balls is GCr15 chromium steel. This material is designed for an operating temperature range of -20 °C up to +120 °C and is therefore adapted to the respective RS-disc material NBR.

The following weight percentages are
permissible for the most important steel components:

GCr 15

C 0.95 ...1.10%
Mn

 0.50%

Si  0.15 ... 0.35%
P < 0.025%
S < 0.025%
Cr 1.30 ... 1.60%

The cages are made of sheet steel and are designed,
according to size, with the following composition:

Table 21: Cage materials

For corrosion resistant bearings, the rings and rolling elements are manufactured in AISI 440C. The cages of these bearings are made of AISI 304 (other special materials available upon request).

The following weight percentages are
permissible for the most important steel components:

AISI 440C

C 0.95 ...1.20%
Mn

 1.0%

Si <  1.0%
P < 0.04%
S < 0.03%
Cr 16...18%