Cobalt-Chrome Alloy L605 As Printed
Print state
UNS R30605 · EN 2.4964, CoCr20W15Ni · also Haynes 25, CoCrWNi
Baseline LPBF/SLM condition: fine cellular structure gives high yield strength but reduced ductility and high residual stress — usually heat treated before service.
Values for the As Printed condition
Other L605 tempers and conditions
L605 is listed in 5 conditions; see the grade overview at L605.
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 |
As PrintedThis page 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 As Printed?
L605 As Printed is L605 in the As Printed condition — baseline LPBF/SLM condition: fine cellular structure gives high yield strength but reduced ductility and high residual stress — usually heat treated before service. L605 As Printed has a yield strength of 700 MPa (102 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 81% of cobalt-chrome alloy grades. Elongation at break is 20% and the elastic modulus is 215 GPa (31.2 Msi). L605 As Printed has a density of 9.1 g/cm³ (0.329 lb/in³), heavier than 96% of cobalt-chrome alloy grades. It melts at 1,329°C (2,424 °F). Solution Annealed is the default condition FabDigit quotes; As Printed is available on request or by drawing note.
Advantages
- Forms and bends easily — 60/100, better than 95% of cobalt-chrome alloy grades
- Readily welded — 72/100, better than 93% of cobalt-chrome alloy grades
- High strength — 700 MPa (102 ksi), better than 81% of cobalt-chrome alloy grades
- Ductile — tolerates forming and impact — 20%, better than 78% 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
L605 As Printed properties
Typical room-temperature values for L605 As Printed; 11 are specific to this condition. Other listed values are L605 reference data and may not represent this condition. Bars are the position among cobalt-chrome alloy grades.
Physical3
L605 As Printed has a density of 9.1 g/cm³ (0.329 lb/in³), heavier than 96% of cobalt-chrome alloy grades. It melts at 1,329°C (2,424 °F).
Mechanical14
L605 As Printed has a yield strength of 700 MPa (102 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 81% of cobalt-chrome alloy grades. Elongation at break is 20% and the elastic modulus is 215 GPa (31.2 Msi).
Thermal6
L605 As Printed is rated for continuous service to 700°C (1,292 °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 As Printed conducts electricity at 1.9 % IACS, worse than 52% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), worse than 54% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of L605 As Printed 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 As Printed's machinability is poor (15/100, better than 79% of cobalt-chrome alloy grades); weldability very good (72/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with L605 As Printed
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.
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.
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 |
L605 As Printed — frequently asked
What is L605 As Printed used for?
L605 As Printed 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 As Printed?
L605 As Printed has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 81% of cobalt-chrome alloy grades. Strength varies by condition: see the 5 listed tempers.
Is L605 As Printed easy to machine?
Not especially — machinability is rated poor (15/100, better than 79% 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 As Printed 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 As Printed?
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 As Printed 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 As Printed?
L605 As Printed is rated for continuous use to about 700°C (1,292 °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.
Can FabDigit make parts in L605 As Printed?
Yes — L605 As Printed 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.