|
AISI type 420 stainless steel balls afford the advantage
of maximum hardness combined with corrosion-resisting
properties. This hardness, together with precise geometry and
fine surface finish, makes them especially useful for both
bearing and valve applications, as well as writing instruments
and lighters.
Discontinued
|
Material
|
AISI
|
Federal
|
Military
|
ASTM
|
UNS
|
AMS
|
|
Type 420
|
420
|
QQ-S-763
|
MS 19060
|
A-756
|
S-42000
|
5630
|
|
Chemical Analysis
|
|
Carbon
|
0.30% maximum
|
|
Chromium
|
12.0% to 14.0%
|
|
Manganese
|
1.0% maximum
|
|
Silicon
|
1.0% maximum
|
|
Nickel
|
10.0% to 14.0%
|
|
Phosphorus
|
0.04% maximum
|
|
Sulphur
|
0.03% maximum
|
|
Mechanical Properties
Hardness as measured on parallel flat surfaces is
Rockwell C 52.
|
|
Tensile
Strength
|
95,000 to 250,000 psi
|
|
Yield Strength
|
50,000 to 215,000 psi
|
|
Elongation in two
inches
|
8.0% to 25.0%
|
|
Reduction in
area
|
25.0% to 55.0%
|
|
Modulus of
elasticity
|
29,000,000 psi
|
|
Density
|
0.279 lbs./cu. in
|
|