| Established in
1952 |
 |
Page: 2200 |
| Technical Data Sheet #3 |
Bearing Steel
C/S - Chrome Steel, 52100, Chrome
Alloy Tool Steel
All of the above are common ways of describing the most widely
used material for the manufacturer of precision balls, It is a
through hardening, fine grain, Martinsitic steel. Because of its
high hardness and fine grain structure, this material can be
finished to an extremely fine quality.
HARDNESS
Using our standard heat treating
procedure, this material will harden to a minimum of 60 on the
Rockwell "C" scale (60 HRC). The hardness may be measured between
parallel ground flats. If the reading is taken on a spherical
surface, it is corrected for the curve. The Rc scale uses 150
Kilogram Load ( approximately 330 lb. ) applied to a conical
diamond brale indenter.
DENSITY
of this material is .283 pounds per cubic
inch.
MAGNETIC
This material is strongly attracted by a
magnetic field.
MACHINE ABILITY
in the hardened condition, this
material can be ground, honed, and lapped using conventional
abrasives. It can be shaped and drilled using electrical
discharge machining or ultrasonic cavitation. In the annealed
condition, this material can be machined using normal techniques.
WELDABILITY
Because this material has 1% carbon, it does not weld well. It
can be resistance welded with difficulty. It can be soft soldered
with a high tin solder using an acid flux. It can be silver
soldered or brazed; but the heat will cause distortion of the
ball and a loss of hardness. For light load applications, the
ball can be attached with an adhesive such as epoxy. When
adhesive bounding is used, an area on the ball should be roughed
up by etching or abrasive blasting. The area should be thoroughly
cleaned.
| Chrome Steel
Chemical Analysis |
| Carbon |
0.95 - 1.10% |
| Manganese |
0.2 - 0.45% |
| Silicon |
0.25 - 0.35% |
| Phosphorus |
0.025% Max. |
| Sulphur |
0.025% Max. |
| Chromium |
1.30 - 1.60% |
| Ferrite |
Balance |