Cobalt-Chrome Alloy L605
UNS R30605 · EN 2.4964, CoCr20W15Ni · also Haynes 25, CoCrWNi
L605 (Haynes 25, UNS R30605, 2.4964, CoCr20W15Ni) is a solid-solution-strengthened Co-Cr-W-Ni alloy that retains strength and oxidation resistance to about 980 °C, and is the same composition used medically as ASTM F90.
Values for the Solution Annealed condition
L605 tempers and conditions
L605 is supplied in 5 conditions, soft to hard. Solution Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution AnnealedDefault 1175–1230 °C, rapid cool | Standard mill condition for sheet, plate, bar and tube — maximum ductility and formability, best corrosion and creep behaviour baseline. | 460 | 1,010 | 58 | 240 HB | — |
Hot isostatic pressed | Choose for AM or cast parts needing closed porosity, homogenised structure and best ductility/fatigue for flight or implant hardware. | 480 | 980 | 50 | 245 HB | — |
sub-solution anneal (approx. 900–1100 °C) | Use to relax residual stress in welded, cold-formed or additively built parts while keeping most of the strength. | 570 | 1,030 | 32 | 28 HRC | 1.9 % IACS |
laser powder-bed fusion, no post heat treatment | Baseline LPBF/SLM condition: fine cellular structure gives high yield strength but reduced ductility and high residual stress — usually heat treated before service. | 700 | 980 | 20 | 32 HRC | — |
Cold Worked / Cold Drawn (approx. 30–50 % reduction) | Pick for high-strength springs, wire, stents and thin-wall tube where strength matters more than ductility. | 1,250 | 1,520 | 10 | 42 HRC | — |
What is L605?
L605 (Haynes 25, UNS R30605, 2.4964, CoCr20W15Ni) is a solid-solution-strengthened Co-Cr-W-Ni alloy that retains strength and oxidation resistance to about 980 °C, and is the same composition used medically as ASTM F90. Solution-annealed material gives 1010 MPa tensile strength, 460 MPa yield, 58 % elongation and 240 HB (98 HRB), supplied as sheet, bar, forgings, HIPed and printed parts. Engineers pick it for hot-gas hardware and springs where nickel superalloys lack wear or sulphidation resistance. It work-hardens rapidly, machines poorly (score 18) and carries a high cobalt-tungsten cost; Haynes 188 is the nearest alternative for longer high-temperature exposure. L605 has a density of 9.13 g/cm³ (0.33 lb/in³), heavier than 98% of cobalt-chrome alloy grades. It melts at 1,329°C (2,424 °F). L605 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 1,010 MPa (146 ksi) — weaker than 90% of cobalt-chrome alloy grades. Elongation at break is 58% and the elastic modulus is 225 GPa (32.6 Msi).
What is L605 used for?
- Combustion liners and transition ducts
- Turbine and exhaust valves
- Hot-gas ducting and seals
- High-temperature springs
- Afterburner and nozzle components
- Surgical implants and stents
- High-temperature fasteners
Advantages
- Ductile — tolerates forming and impact — 58%, better than 100% of cobalt-chrome alloy grades
- Forms and bends easily — 60/100, better than 95% of cobalt-chrome alloy grades
- High service temperature — 980°C (1,796 °F), better than 93% of cobalt-chrome alloy grades
- Readily welded — 72/100, better than 93% of cobalt-chrome alloy grades
Limitations
- Poor heat conductor — 9.4 W/m·K (5.43 BTU/hr·ft·°F), worse than 100% of cobalt-chrome alloy grades
- High embodied carbon — 19 kg CO₂/kg, worse than 98% of cobalt-chrome alloy grades
- Low strength — 460 MPa (66.7 ksi), worse than 90% of cobalt-chrome alloy grades
L605 properties
Typical room-temperature values for L605-Solution Annealed; bars are the position among cobalt-chrome alloy grades.
Physical3
L605 has a density of 9.13 g/cm³ (0.33 lb/in³), heavier than 98% of cobalt-chrome alloy grades. It melts at 1,329°C (2,424 °F).
Mechanical14
L605 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 1,010 MPa (146 ksi) — weaker than 90% of cobalt-chrome alloy grades. Elongation at break is 58% and the elastic modulus is 225 GPa (32.6 Msi).
Thermal6
L605 is rated for continuous service to 980°C (1,796 °F). It conducts heat at 9.4 W/m·K (5.43 BTU/hr·ft·°F), worse than 100% of cobalt-chrome alloy grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
L605 conducts electricity at 1.9 % IACS, worse than 52% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 70% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of L605 takes about 250 MJ of energy and emits 19 kg of CO₂ — more than 95% of cobalt-chrome alloy grades. Typical recycled content is 30%.
Manufacturability8
L605's machinability is poor (18/100, better than 91% of cobalt-chrome alloy grades); weldability very good (72/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the cobalt-chrome alloy family
Yield strength against density for every cobalt-chrome alloy grade FabDigit runs. L605 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with L605
Is L605 easy to machine?
Machine like a work-hardening superalloy: rigid setups, positive-rake carbide or ceramic tooling, low speed / heavy feed, flood coolant and no dwelling to avoid glazing and rapid tool wear.
Can L605 be welded?
Readily GTAW/PAW/EB/laser welded with matching L605 filler (AMS 5796); keep heat input low, use clean argon shielding and re-solution anneal heavily restrained or cold-worked joints.
Can L605 be formed, bent or molded?
Cold forms well when annealed but hardens fast — allow generous bend radii, interstage anneals at 1175–1230 °C; hot work at 1150–1230 °C and finish above ~1050 °C.
Manufacturability
The process limits FabDigit's quote engine applies to L605. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Poor18 / 100 |
|---|---|
| Cutting speed (rough / finish) | — / — |
| Minimum wall | — |
| Minimum internal radius | — |
| Drill depth limit | |
| Best surface (machined / polished) | Ra — / — |
| Hardenable after machining | — |
L605 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 19 – 21 | 20 |
| W | 14 – 16 | 15 |
| Ni | 9 – 11 | 10 |
| Fe | ≤ 3 | 1.5 |
| Mn | 1 – 2 | 1.5 |
| C | 0.05 – 0.15 | 0.1 |
| Si | ≤ 0.4 | 0.2 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cobalance, nominally ~51 % | balance |
What surface finishes work on L605?
Not anodizable; use pickling/passivation, electropolishing or fine mechanical polishing (excellent mirror finish for implants), plus aluminide or thermal-barrier coatings for hot-gas parts.
Surface treatments FabDigit runs on cobalt-chrome alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Cobalt-Chrome Alloy L605 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R30605
- EN / DIN / Werkstoff-Nr.
- 2.4964CoCr20W15Ni
- Trade names
- Haynes 25CoCrWNi
- Also called
- F90
How much does L605 cost?
L605 is a specialty-cost cobalt-chrome alloy ($$$$$), pricier than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
L605 — frequently asked
What is L605 used for?
L605 is typically used for combustion liners and transition ducts, turbine and exhaust valves, hot-gas ducting and seals, high-temperature springs, afterburner and nozzle components and surgical implants and stents. In short: aerospace high-temp cobalt.
What is the yield strength of L605?
L605 has a typical yield strength of 460 MPa (66.7 ksi) and a tensile strength of 1,010 MPa (146 ksi) — weaker than 90% of cobalt-chrome alloy grades. Strength varies by condition: see the 5 listed tempers.
Is L605 easy to machine?
Not especially — machinability is rated poor (18/100, better than 91% of cobalt-chrome alloy grades). Machine like a work-hardening superalloy: rigid setups, positive-rake carbide or ceramic tooling, low speed / heavy feed, flood coolant and no dwelling to avoid glazing and rapid tool wear.
Can L605 be welded?
Yes — weldability is rated very good (72/100). Readily GTAW/PAW/EB/laser welded with matching L605 filler (AMS 5796); keep heat input low, use clean argon shielding and re-solution anneal heavily restrained or cold-worked joints.
What surface finishes work on L605?
Not anodizable; use pickling/passivation, electropolishing or fine mechanical polishing (excellent mirror finish for implants), plus aluminide or thermal-barrier coatings for hot-gas parts.
Can L605 be formed, bent or molded?
Cold forms well when annealed but hardens fast — allow generous bend radii, interstage anneals at 1175–1230 °C; hot work at 1150–1230 °C and finish above ~1050 °C.
What is the maximum service temperature of L605?
L605 is rated for continuous use to about 980°C (1,796 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between L605 Solution Annealed and L605-HIP?
Solution Annealed is the default condition — standard mill condition for sheet, plate, bar and tube — maximum ductility and formability, best corrosion and creep behaviour baseline. HIP: choose for AM or cast parts needing closed porosity, homogenised structure and best ductility/fatigue for flight or implant hardware. Yield strength is 460 MPa in Solution Annealed versus 480 MPa in HIP.
How much does L605 cost?
L605 is a specialty-cost cobalt-chrome alloy ($$$$$), pricier than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in L605?
Yes — L605 is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- AMS 5537 — Cobalt Alloy Sheet, Strip and Plate (UNS R30605) — SAE International (2020)
- AMS 5759 — Cobalt Alloy Bars, Forgings and Rings (UNS R30605) — SAE International (2019)
- ASTM F90 — Wrought Co-20Cr-15W-10Ni Alloy for Surgical Implant Applications — ASTM International (2021)
- HAYNES 25 alloy technical data — Haynes International (2020)
- ASM Handbook Vol.1 & Vol.2 — Superalloys / Cobalt-base alloys — ASM International (1990)
- Additive manufacturing (LPBF) L605 mechanical property compilations — peer-reviewed AM literature / powder producer datasheets (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.