This standard specifies requirements for two wrought cobalt 20, chromium 6, molybdenum alloys used for surgical implants. The specifications are especially applicable to forged rod, rod any wire.
The mechanical properties of the sample obtained from a finished product made of this alloy may differ from those specified in this document.
The high carbon content of this alloy produces a structure with a significant carbide distribution. This can be adjusted either in the manufacture of the bar or in subsequent thermomechanical processing to produce the final device. The carbide distribution in the final device is not included as part of this standard.
If any of the test pieces fails within the size limits and does not meet the specified requirements, the two retest pieces shall be tested in the same way for each failed test piece. The alloy will be considered suitable only if both additional test pieces meet the specified requirements.
If a test piece fails outside of the gauge limits, the test is acceptable if the percent elongation after fracture meets the requirements. If the percent elongation after fracture does not meet the requirements, the test will be canceled and retested.
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