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| Material Analysis |
Cobalt 2 |
Cobalt 3 |
Cobalt 6 |
L-605 (Co-25) |
| Carbon |
2.2/2.7% |
2.00/2.60% |
0.90/1/40% |
.05/.15% |
| Manganese |
1.00% max. |
1.00%max. |
1.00% max. |
1.00/2.00% |
| Silicon |
1.00% max. |
1.00% max. |
1.50% max. |
1.00% max. |
| Tungsten |
16/19% |
11.00/14.00% |
3.5/5.5% |
14-16 |
| Chromium |
31/34% |
29.00/33.00% |
26 |
19-21 |
| Iron |
3.00% max. |
3.00% max. |
3.00% max. |
3.00% max. |
| Nickel |
2.50% max. |
3.00% max. |
3.00% max. |
9/11% |
| Other |
2.00% max. |
1.00% max. |
2.00% max. |
.06% max. |
| Molybdenum |
-- |
-- |
1.50% max. |
-- |
| Beryllium |
-- |
-- |
-- |
-- |
| Cobalt |
Balance |
Balance |
Balance |
Balance |
| |
| Physical Properties of Cobalt Balls |
| Specific Gravity |
8.80 |
8.69 |
8.46 |
9.13 |
| Density lb/in. 3 |
0.317 |
0.314 |
0.305 |
0.330 |
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Mechanical Properties of Cobalt Balls
(Cold Worked and Age Hardened) |
| Tensile Strength |
40 KPsi |
82 Kpsi |
90 Kpsi |
285 Kpsi |
| Yield Strength |
60 Kpsi |
44 Kpsi |
78 Kpsi |
45 Kpsi min |
| Elongation |
Nil |
Nil |
1% |
10% Typical |
| Rockwell Hardness |
R C 55-59 min. |
R C 51-58 min |
R C 39-43 |
40-50 Typical |
Cobalt Balls Information Page |
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Stock Availability of Cobalt Balls
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Available
Stock Sizes |
Roundness
Dia. Tol/Ball |
Basic Dia.
Tolerance |
Surface
Finish |
| Material |
Ball Grade |
Inches |
Inches |
Inches |
Micro Inch |
| Cobalt #2 |
25 |
3/16 - 5/8 |
.000025 |
±.0001 |
1.5 |
| Cobalt #3 |
25 |
1/4, 3/8, 9/16 |
.000025 |
±.0001 |
1.5 |
| Cobalt 6, L 605 - Non Stock |
Alloys conforming to MIL - C - 24248 and Mil C - 24252 available on request.
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Cobalt Balls Information Page |
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Precision Balls Directory - for a complete precision balls guide - click here
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