The increase in the Al and Fe content results in a material in which the hard gamma 2 phase (about 400 HB) is present. By correct metallurgical control this hard constituent is uniformly distributed giving this alloy its ability to resist wear.
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7.2 g/cm³ at 23 °C
Coefficient of thermal expansionα
1.62E-5 1/K at 23 °C
Specific heat capacitycp
420 J/(kg·K) at 23 °C
42 W/(m·K) at 23 °C
6.00E+6 S/m at 23 °C
Specific Electrical conductivity
10 % IACS
AMPCO® 21 is used for guide port bushings and wear strips replacing hardened steel and for some cams when no impact is involved. However, the largest single use is as die rings, inserts, forming rolls, etc. in forming, bending or drawing operations, especially when stainless steel is the material being processed. AMPCO® 21 is also widely used as work support blades for the centerless grinding of steel rods.
This material data has been provided by AMPCO METAL.