Copper Alloy C60800-O61
Heat-treated state · default condition
UNS C60800
O61 = annealed
Standard condition for ASTM B111 condenser/heat-exchanger tube — maximum ductility for expanding and rolling into tubesheets.
Values for the O61 condition
Other C60800 tempers and conditions
C60800 is listed in 4 conditions; see the grade overview at C60800.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose when maximum softness for severe tube-end expansion, bending or U-bending is required. | 165 | 395 | 60 | 88 HB | 17 % IACS |
O61DefaultThis page Annealed | Standard condition for ASTM B111 condenser/heat-exchanger tube — maximum ductility for expanding and rolling into tubesheets. | 186 | 415 | 55 | 100 HB | 17 % IACS |
Light-drawn tube | Light cold draw for straighter, slightly stronger tube where the ends will still be expanded. | 275 | 460 | 35 | 120 HB | 17 % IACS |
Hard drawn | Rarely stocked; used where higher strength and stiffness of the tube wall matter more than expandability. | 400 | 550 | 15 | 158 HB | 16.5 % IACS |
What is C60800-O61?
C60800-O61 is C60800 heat treated to O61 — standard condition for ASTM B111 condenser/heat-exchanger tube — maximum ductility for expanding and rolling into tubesheets. C60800-O61 has a yield strength of 186 MPa (27 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 58% of copper alloy grades. Elongation at break is 55% and the elastic modulus is 117 GPa (17 Msi). C60800-O61 has a density of 8.17 g/cm³ (0.295 lb/in³), lighter than 86% of copper alloy grades. It melts at 1,035°C (1,895 °F).
Advantages
- Ductile — tolerates forming and impact — 55%, better than 98% of copper alloy grades
- Good corrosion resistance — 76/100, better than 91% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
- Forms and bends easily — 82/100, better than 83% of copper alloy grades
C60800-O61 properties
Typical room-temperature values for C60800-O61; 20 are specific to this condition. Other listed values are C60800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C60800-O61 has a density of 8.17 g/cm³ (0.295 lb/in³), lighter than 86% of copper alloy grades. It melts at 1,035°C (1,895 °F).
Mechanical14
C60800-O61 has a yield strength of 186 MPa (27 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 58% of copper alloy grades. Elongation at break is 55% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C60800-O61 is rated for continuous service to 250°C (482 °F). It conducts heat at 82 W/m·K (47.4 BTU/hr·ft·°F), better than 50% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C60800-O61 conducts electricity at 17 % IACS, better than 50% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), better than 91% of copper alloy grades.
Sustainability4
Producing a kilogram of C60800-O61 takes about 57 MJ of energy and emits 3.6 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 25%.
Manufacturability7
C60800-O61's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability very good (70/100); formability very good (82/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C60800-O61
Is C60800 easy to machine?
Gummy, tough alpha bronze (≈20 % of free-cutting brass): use sharp positive-rake carbide tooling, slow feeds, generous coolant and expect long stringy chips.
Can C60800 be welded?
GTAW/GMAW with aluminum-bronze filler (ERCuAl-A2) works well under gas shielding; the tenacious alumina film must be removed, and oxyacetylene welding or soldering is not recommended.
Can C60800 be formed, bent or molded?
Annealed tube cold-forms, bends and expands readily; interanneal near 600–700 °C for heavy cold work and hot-work around 700–850 °C.
What surface finishes work on C60800?
Not anodizable; pickle in dilute sulfuric/nitric to strip alumina film, then polish, tin/nickel plate for solderability, or leave to develop a protective oxide in service.
C60800 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 |
|---|---|---|
| Al | 5 – 6.5 | 5.7 |
| Asinhibits dealuminification | 0.02 – 0.35 | 0.06 |
| Fe | ≤ 0.1 | — |
| Pb | ≤ 0.1 | — |
| Snnot intentionally added; trace only | ≤ 0 | — |
| Curemainder; 92.5 % min per ASTM B111/CDA | ≥ 92.5 (balance) | — |
C60800-O61 — frequently asked
What is C60800-O61 used for?
C60800-O61 is typically used for condenser tubing, heat exchanger tubes and marine piping. In short: tube-grade aluminum bronze; very high formability; poor machinability.
What is the yield strength of C60800-O61?
C60800-O61 has a typical yield strength of 186 MPa (27 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 58% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C60800-O61 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Gummy, tough alpha bronze (≈20 % of free-cutting brass): use sharp positive-rake carbide tooling, slow feeds, generous coolant and expect long stringy chips.
Can C60800-O61 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with aluminum-bronze filler (ERCuAl-A2) works well under gas shielding; the tenacious alumina film must be removed, and oxyacetylene welding or soldering is not recommended.
What surface finishes work on C60800-O61?
Not anodizable; pickle in dilute sulfuric/nitric to strip alumina film, then polish, tin/nickel plate for solderability, or leave to develop a protective oxide in service.
Can C60800-O61 be formed, bent or molded?
Annealed tube cold-forms, bends and expands readily; interanneal near 600–700 °C for heavy cold work and hot-work around 700–850 °C.
What is the maximum service temperature of C60800-O61?
C60800-O61 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C60800-O61 and C60800-H80?
O61 is the default condition — standard condition for ASTM B111 condenser/heat-exchanger tube — maximum ductility for expanding and rolling into tubesheets. H80: rarely stocked; used where higher strength and stiffness of the tube wall matter more than expandability. Yield strength is 186 MPa in O61 versus 400 MPa in H80.
Sources
- ASTM B111/B111M Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock — ASTM International (2021)
- CDA Alloy Datasheet C60800 (copper.org Standards & Properties) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
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.