ASTM F1537
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ASTM F1537 is a cobalt chrome molybdenum alloy used in medical and surgical devices requiring high fatigue strength such as orthopedic total joint replacement.

Chemical Data, Mechanical Data and Specifications for ASTM F1537 Cobalt Chrome.

Chemical

Chemical Range for ASTM F1537 Alloy 1 (UNS R31537)
Element Minimum Maximum
Carbon -- 0.14
Chromium 26.0 30.0
Cobalt Balance --
Iron -- 0.75
Manganese -- 1.00
Molybdenum 5.00 7.00
Nickel -- 1.00
Nitrogen -- 0.25
Silicon -- 1.00

Mechanical

Typical Mechanical Properties for ASTM 1537
Form Tensile Strength Yield Strength Elongation at Break
Annealed 130 ksi min 75 ksi min 20% min
Hot Worked 145 ksi min 101 ksi min 12% min
Warm Worked 170 ksi min 120 ksi min 12% min

Specs

Applicable Specifications
Rod ASTM F 1537
Designation 28Cr-6Mo
UNS R31537