Cobalt Balls Chart

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
 
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

Stock Availability of Cobalt Balls

    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.

Cobalt Balls Information Page