|Established in 1952
Tuesday, December 10, 2013
Type 440C Stainless Steel is widely used in
antifriction bearings, in valves and in many other applications
where high hardness and reasonable corrosion resistance are
required. This material is much more resistant to abrasion and
wear than chrome steel. It is a high alloy, fine grain, through
hardening, Martensitic stainless steel. Because of its high
hardness and fine grain structure, it can be finished to a fine
HARDNESS This material will harden to 58 rockwell "C" (58 HRC) minimum. The hardness is measured on parallel ground flats or the reading taken on the spherical surface is corrected for the curve. The HRC scale uses 150 kilogram load ( approximately 330 lb. ) applied to a conical diamond "brale" indenter.
DENSITY of this material is .277 pounds per cubic inch ( 7.67 g/cm^3).
MAGNETIC This material is strongly attracted by a magnetic field.
MACHINABILITY In the hardened condition, this material can be ground, honed, and lapped using conventional abrasives. It can be shaped and drilled using electric 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 is difficult to obtain a quality weld. 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
considerable loss of hardness. For light load applications, the
ball can be attached with an adhesive such as epoxy. When
adhesive bonding is used, an area on the ball should be roughed
up by etching or abrasive blasting.
See the page, Ball Material Selection, Page 2080, for more information.
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