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STANDARD
MATERIALS
Stainless Steel Types:
440C • 430 • 420 • 316 • 304/302
Stainless
Steel Type 440C
General Information
Balls of this straight chromium steel
are designed to provide stainless steel
properties with maximum hardness.
They are always used in a hardened
condition and in some respects behave
similar to tool steels. After
quenching, the balls are immediately
subjected to ultra-low temperatures
which results in a stabilized structure
and increased hardness.
Material Characteristics
Outstanding characteristic is high
hardness. Material is ferro-magnetic
and makes a good permanent magnet.
As hardened for ball use, it is not
readily machinable. All balls of
this material are passivated.
Corrosion Resistance
Excellent resistance to such conditions
as fresh water, steam, crude oil,
gasoline, blood, perspiration, alcohol,
sterilizing solutions and foodstuffs.
Hardness
Rockwell C - 58 to 62 measured on
parallel flats.
Sizes Available
1.0mm to 2 1/2" in Grades 10 through
1000.
Stainless
Steel Type 430
General Information
Economical choice over 302/304 for
corrosive environments and conditions.
Magnetic properties offer advantages in assembly
of 430 products.
Material Characteristics
Offers good resistance to mild
atmospheric conditions. Provides superior
resistance to chloride stress corrosion at
elevated temperatures than 302/304 or 316
materials. All balls of this alloy are
passivated.
Corrosion Resistance
430 is resistant to steam, dairy
products, nitric acid and many petroleum
products and organic materials. Superior
material for use in cosmetic applications.
Hardness
Annealed B - 75 - 95 measured on
parallel flats.
Sizes Available
3/32" to 1" in grades 100 through 2000.
Cosmetic ball grades readily available.
Stainless Steel Type
420
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Type Analysis
AISI-420
Carbon
.15% MIN,
Chromium
12-14%;
Manganese
1.00%,
Phosphorus
0.04%,
Sulfur
0.03%,
Silicon
1.0% Max.
Martensitic Stainless Steel |
General Information
Very good wear characteristics and hardness.
Hardness slightly reduced versus 440C while
providing enhanced corrosion resistance.
Corrosion Resistance
Excellent corrosion resistance from mild
atmostpheres, fresh water, steam, blood,
ammonia, petroleum products, and mild acidic
environments.
Hardness
Rockwell "C" - 48 to 52 measured on
parallel flats.
Sizes Available
3/64" to 2 1/2" in Grades 10 through
1000. Burnishing product also available.
Stainless Steel Type 316
| |
Type Analysis
AISI-316
Carbon
Chromium
Nickel
Molybdenum
Manganese
Phosphorous
Sulfur |
.08% max
16% to 18%
10% to 14%
2% to 3%
2.0%
0.045%
0.030%. |
General Information
Similar to type 302, but with superior
corrosion resistance. Developed to effectively
resist the corrosion of sulphuric acid compounds, it
is now used extensively for process equipment for
photographic chemicals, inks, rayon, rubber, textile
bleaches, dye stuffs and high temperature equipment.
Material characteristics
This steel has higher tensile and creep strength
at elevated temperature than conventional 302
alloys. All balls of this material are passivated.
Physical Constants
Density - 0.29 lbs./cu. in. Specific Electrical
Resistance at room temperature - 445 ohms/cu. mil.
ft.
Sizes Available
Available in sizes from 3/64 to 2 ½" in Grades
50 through 1000. Burnishing Products also available.
Stainless Steel
Type 304/302
| |
Type Analysis
AISI 304:
Carbon
Nickel
Chromium
Manganese
Silicon
Phosphorous
Sulfur |
.08% max
8-10.5%
18-20%
2.0%
1.0%
0.045%
0.030% |
AISI 302
Carbon
Nickel
Chromium
Manganese
Silicon
Phosphorous
Sulfur |
.15% max
8-10%
17-19%
2.0%
1.0%
0.045%
0.030% |
General Information
Type 18-8 Stainless stainless steel balls
are used when conditions require the degree of
non-corrosive qualities and toughness of material
not available in hardenable stainless. Principal
applications are in couplings, valves and pumps.
Material Characteristics
Extreme toughness - 70 to 110 foot pounds
in the annealed state by the izod Test. Low
magnetic permeability: annealed, 1.003; cold worked,
1.10; severely cold worked, 10.0. High tensile
strength at elevated temperatures. Resistance
to Scaling: Continuous Service -1600 degrees F;
Intermittent Service -1450 degrees F. This
material work hardens quite rapidly. All balls
of this material are passivated.
Corrosion Resistance
Resistant to attack by foodstuffs,
sterilizing solution, oxidizing solutions and most
organic chemicals. It is susceptible to attack by
halogen acids and moderately resistant to the
sulphur acids.
Hardness
Annealed Rockwell B - 75 to 95 measured on
parallel flats. Not annealed Rockwell C - 39 maximum
measured on parallel flats.
Sizes Available
3/64 to 2 1/2" in Grades 50 through 1000.
Burnishing products also available |
