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 elements8 elements | |||
| Co | Cobalt | 34 – 38% | |
| Ni | Nickel | Bal. | |
| Cr | Chromium | 18 – 20% | |
| Fe | Iron | 8 – 10% | |
| Mo | Molybdenum | 6 – 8% | |
| Ti | Titanium | 2.5 – 3.25% | |
| Nb | Niobium | 0.25 – 0.75% | |
| Al | Aluminium | 0.1 – 0.3% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual2 elements | |||
| C | Carbon | ≤ 0.04% | |
| B | Boron | ≤ 0.03% | |
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 ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Cold-drawn bar (nominal dia. or across flats ≤44 mm) | Solution treated and cold drawn as supplied, not aged | — | — | — | Also specified: Hardness ≥ 38 HRC |
| Cold-drawn bar (nominal dia. or across flats ≤44 mm) | 1038–1052 °C for 4–8 h, water quenched, cold drawn, then aged at 649–677 °C for 4–4.5 h, air cooled | ≥ 1793 (260 ksi) | ≥ 1724 (250 ksi) | ≥ 6 | Also specified: Hardness ≥ 44 HRC |
| Cold-drawn bar — elevated-temperature tensile after ageing | Tested at 593 ± 6 °C, held 20–30 min | ≥ 1413 (205 ksi) | ≥ 1310 (190 ksi) | ≥ 5 |
Where this grade is recommended
Matched in 6 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| HT bolting & seal rings | Aerospace | 400 – 650 °C | 1 / 6 | 93 |
| HS fasteners & shafts | Aerospace | 300 – 650 °C | 1 / 9 | 92 |
| Guidewires & implant wire | Medical Devices | In-body (37 °C) | 3 / 5 | 86 |
| HT fasteners & springs | Power & Nuclear | 400 – 650 °C | 5 / 7 | 86 |
| Drill string & non-mag collars | Oil & Gas | ≤ 150 °C | 5 / 6 | 84 |
| Packers & downhole tools | Oil & Gas | ≤ 150 °C | 7 / 7 | 84 |
Designations & equivalents
| Trade name(s) | MP159 |
| AMS (SAE aerospace) | 5842 |
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
Name the standard and its edition on the order.
Frequently asked questions
What is MP159 · UNS R30159?
MP159 · UNS R30159 — Ni-Co multiphase. High-temperature MP grade — 650 °C-class ultra-high-strength fasteners
What is the maximum service temperature of R30159?
Typically about 650 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of R30159?
The specified minimum tensile strength is 1793 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 R30159?
SAE AMS5842 MP159 UNS R30159
Where is R30159 typically used?
HT bolting & seal rings (Aerospace); HS fasteners & shafts (Aerospace); Guidewires & implant wire (Medical Devices); HT fasteners & springs (Power & Nuclear)
In which forms is R30159 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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