Physical properties
| Density | 9.1 | g/cm³ |
| Modulus E | 226 | GPa |
| Thermal conductivity | 15 | W/(m·K) |
| Thermal expansion | 13 | ×10⁻⁶/K |
| Specific heat | 0.42 | kJ/(kg·K) |
| Resistivity | 0.89 | Ω·mm²/m |
Informative values: they vary with composition, condition and test method. Use the governing standard or measured mill data for pressure and heat-transfer calculations.
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 elements6 elements | |||
| Co | Cobalt | Bal. | |
| Cr | Chromium | 19 – 21% | |
| W | Tungsten | 14 – 16% | |
| Ni | Nickel | 9 – 11% | |
| Mn | Manganese | 1 – 2% | |
| C | Carbon | 0.05 – 0.15% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual4 elements | |||
| Si | Silicon | ≤ 0.4% | |
| Fe | Iron | ≤ 3% | |
| P | Phosphorus | ≤ 0.04% | |
| S | Sulphur | ≤ 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 |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Bar, forgings and flash-welded rings | Solution heat treated at 1177–1232 °C, air cooled or faster | ≥ 862 (125 ksi) | ≥ 310 (45 ksi) | ≥ 30 | Also specified: Hardness ≤ 277 HB |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Solution heat treated, t >1.09-57.15 mm | ≥ 896 (130 ksi) | 379 – 552 | ≥ 45 | |
| Foil and thin strip | Solution heat treated, t 0.076-0.127 mm | ≥ 896 (130 ksi) | 379 – 552 | ≥ 25 | |
| Plate and strip (implant grade) | Annealed, t 1.09-4.75 mm | ≥ 896 (130 ksi) | ≥ 379 (55 ksi) | ≥ 45 | |
| Several forms | |||||
| Bar and wire (implant grade) | Annealed | ≥ 860 (125 ksi) | ≥ 310 (45 ksi) | ≥ 30 | |
| Bar and wire (implant grade) | Cold worked | ≥ 1250 (181 ksi) | ≥ 760 (110 ksi) | ≥ 15 | |
| Long products ≤160 mm and flat products ≤20 mm (EN 10302, 2.4964) | +AT (solution annealed) | ≥ 860 | ≥ 340 | ≥ 35 | Flat products under 3 mm: A five points lower. |
Creep behaviour
Guidance values (MPa) — Mean values of a scatter band. They are neither an acceptance requirement nor a design allowable stress. Figures in parentheses are long-term extrapolations and less reliable than the tested range.
| Temp °C | Creep strength Rp1.0 (1% plastic strain) | Rupture strength Ru | ||
|---|---|---|---|---|
| 10 000 h | 100 000 h | 10 000 h | 100 000 h | |
| 700 | 130 | (88) | 160 | (120) |
| 750 | 82 | — | 110 | — |
| 800 | 47 | (21) | 68 | (35) |
| 850 | 23 | (9.7) | 35 | (18) |
| 900 | 11.3 | (4) | 20.5 | (9) |
| 950 | 5.6 | (1.8) | 11.2 | (4) |
| 1000 | 2.8 | — | 5.4 | — |
Thermal expansion and elastic modulus
| Temperature range | Mean coefficient ×10⁻⁶/K |
|---|---|
| 20–200 °C | 13 |
| 20–300 °C | 13.5 |
| 20–400 °C | 14 |
| 20–600 °C | 15 |
| 20–800 °C | 16.1 |
| 20–1000 °C | 17.1 |
Elastic modulus vs temperature
| Temp °C | E GPa |
|---|---|
| 20 | 226 |
| 100 | 222 |
| 200 | 216 |
| 300 | 210 |
| 400 | 202 |
| 500 | 196 |
| 600 | 186 |
| 700 | 178 |
| 800 | 171 |
| 900 | 164 |
| 1000 | 148 |
| 1100 | 140 |
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 |
|---|---|---|---|---|
| Gas-turbine hot section | Power & Nuclear | 800 – 950 °C | 6 / 10 | 85 |
Designations & equivalents
| W.Nr. (Germany) | 2.4964 |
| EN designation | CoCr20W15Ni |
| Trade name(s) | Haynes 25 / L-605 / KC20WN |
| ASTM / AISI | F90 |
| AMS (SAE aerospace) | 5537 / 5759 / 5796 / 5797 |
| ISO | ISO 5832-5 |
| NACE sour service | ISO 15156-3: any equipment, ≤35 HRC |
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
7 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Alloy 25 / L-605 (GH605) · UNS R30605?
Alloy 25 / L-605 (GH605) · UNS R30605 — Cobalt superalloys. Cobalt-base classic — 980 °C-class combustors and wear parts
What is the maximum service temperature of R30605?
Typically about 816 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of R30605?
The specified minimum tensile strength is 896 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 R30605?
AMS5537, AMS5759, AMS5796, AMS5797, ASTM F90, ISO 5832-5, EN 10302 (creep-resisting steels, nickel and cobalt alloys)
Where is R30605 typically used?
Gas-turbine hot section (Power & Nuclear)
In which forms is R30605 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
Or email us: info@kochlin.com