Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements3 elements | |||
| Co | Cobalt | Bal. | |
| Cr | Chromium | 26 – 30% | |
| Mo | Molybdenum | 5 – 7% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| C | Carbon | ≤ 0.14% | |
| Ni | Nickel | ≤ 1% | |
| Fe | Iron | ≤ 0.75% | |
| Si | Silicon | ≤ 1% | |
| Mn | Manganese | ≤ 1% | |
| N | Nitrogen | ≤ 0.25% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % |
|---|---|---|---|---|
| Bar, round bar and wire | Annealed | ≥ 897 (130 ksi) | ≥ 517 (75 ksi) | ≥ 20 |
| Bar, round bar and wire | Hot-worked, not annealed | ≥ 1000 (145 ksi) | ≥ 700 (102 ksi) | ≥ 12 |
| Bar, round bar and wire | Warm-worked, thermomechanically strengthened | ≥ 1172 (170 ksi) | ≥ 827 (120 ksi) | ≥ 12 |
Where this grade is recommended
Matched in 1 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Orthopaedic & dental implants | Medical Devices | High-temperature processing | 2 / 8 | 93 |
Designations & equivalents
| UNS | R31537 / R31538 |
| EN designation | CoCr28Mo6 |
| Trade name(s) | Wrought CoCrMo / Low-carbon |
| ASTM / AISI | ASTM F1537 |
| ISO | ISO 5832-12 |
R31537 (low carbon) and R31538 (high carbon) have different carbon requirements and are not interchangeable.
More detail 1
The composition on this page is for low-carbon R31537 — state the UNS number on the order.
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
2 specifications. Name the standard and its edition on the order.
Hardness in ASTM F1537 is a typical reference value, not grounds for acceptance or rejection.
More detail 1
Finished product of 6.35 mm and over requires ultrasonic inspection to AMS 2630 Class A1.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Wrought Co-Cr-Mo (ASTM F1537)?
Wrought Co-Cr-Mo (ASTM F1537) — Co-Cr-Mo alloys. Wrought low-carbon CoCrMo — hip and knee forgings and bearing surfaces
What is the maximum service temperature of F1537?
Typically about 350 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of F1537?
The specified minimum tensile strength is 1000 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover F1537?
ASTM F1537, ISO 5832-12
Where is F1537 typically used?
Orthopaedic & dental implants (Medical Devices)
In which forms is F1537 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
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