This specification covers the material requirements for low-carbon (UNS R31537), high-carbon (UNS R31538), and dispersion-strengthened (UNS R31539) cobalt-28chromium-6molybdenum alloy high-strength forgings used for the manufacture of surgical implants. The properties specified here specifically apply to finished or semifinished parts that receive no subsequent thermomechanical processing. The materials shall be in the form of bars, rods, or wires suitable for forging by hammering, pressing, rolling, extruding, or upsetting. The forgings shall adhere to chemical composition, ultimate tensile strength, yield strength, elongation, reduction of area, and hardness requirements.
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1.1 This specification covers requirements of cobalt-28chromium-6molybdenum alloy (UNS R31537, R31538, R31539) high-strength forgings for the manufacture of surgical implants. The properties specified in this document specifically apply to finished or semifinished parts that receive no subsequent thermomechanical processing.
1.2 Wrought material to be used as forging stock in the manufacture of forgings conforming to this specification, typically hot worked and unannealed with a surface finish suitable for forging, shall be fabricated and supplied in accordance with F1537.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E8 Test Methods for Tension Testing of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E112 Test Methods for Determining Average Grain Size
E165 Practice for Liquid Penetrant Examination for General Industry
E930 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size)
F75 Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Castings and Casting Alloy for Surgical Implants (UNS R30075)
F601 Practice for Fluorescent Penetrant Inspection of Metallic Surgical Implants
F981 Practice for Assessment of Compatibility of Biomaterials for Surgical Implants with Respect to Effect of Materials on Muscle and Bone
F1537 Specification for Wrought Cobalt-28Chromium-6Molybdenum Alloys for Surgical Implants (UNS R31537, UNS R31538, and UNS R31539)
cobalt alloys; cobalt alloys (for surgical implants); cobalt-chromium-molybdenum; forgings; metals (for surgical implants); Chromium surgical implant applications--specifications; Cobalt alloys (for surgical implants)--specifications; Cobalt-chromium-molybdenum alloy; Molybdenum (surgical implants)--specifications; Surgical implant forgings--specifications; UNS R31537 (Co-Cr-Mo alloy); UNS R31538 (Co-Cr-Mo alloy); UNS R31539 (Co-Cr-Mo alloy) ;
ICS Number Code 11.040.40 (Implants for surgery, prothetics and orthotics)
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