Copper Alloy C61800-O60
Temper
UNS C61800 · ASTM B150 · EN CW305G · GB QAl9-4
O60 = soft annealed
Choose for maximum ductility before severe forming, bending or deep drawing of rod/plate.
Values for the O60 condition
Other C61800 tempers and conditions
C61800 is listed in 5 conditions; see the grade overview at C61800.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60This page Soft annealed | Choose for maximum ductility before severe forming, bending or deep drawing of rod/plate. | 210 | 520 | 40 | 140 HB | 14 % IACS |
M30Default As hot extruded | The standard stocked condition for round bar, hex and shapes — balanced strength, ductility and cost. | 275 | 585 | 30 | 170 HB | — |
Hot rolled / hot worked plate and flats | Plate, flat bar and forged shapes supplied in the as-hot-worked condition for marine structural parts. | 300 | 600 | 26 | 175 HB | 13 % IACS |
Full hard | Pick for higher yield strength, better surface finish and tighter tolerance on small-diameter rod, shafts and fasteners. | 415 | 655 | 18 | 13 HRC | 12.5 % IACS |
Quench hardened and tempered | Use at the high-aluminium end of the range when maximum strength and wear resistance are needed for bushings, gears and valve stems. | 450 | 725 | 12 | 22 HRC | 12 % IACS |
What is C61800-O60?
C61800-O60 is C61800 in the O60 temper — choose for maximum ductility before severe forming, bending or deep drawing of rod/plate. C61800-O60 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi). C61800-O60 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,043°C (1,909 °F). M30 is the default condition FabDigit quotes; O60 is available on request or by drawing note.
Advantages
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- Tough — resists crack growth — 55 MPa·√m (50.1 ksi·√in), better than 85% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
C61800-O60 properties
Typical room-temperature values for C61800-O60; 10 are specific to this condition. Other listed values are C61800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C61800-O60 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,043°C (1,909 °F).
Mechanical16
C61800-O60 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61800-O60 is rated for continuous service to 300°C (572 °F). It conducts heat at 56 W/m·K (32.4 BTU/hr·ft·°F), worse than 64% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C61800-O60 conducts electricity at 14 % IACS, worse than 56% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of copper alloy grades.
Sustainability4
Producing a kilogram of C61800-O60 takes about 55 MJ of energy and emits 3.7 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C61800-O60's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (70/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C61800-O60
Is C61800 easy to machine?
Tough, gummy chips — use rigid setups, sharp positive-rake carbide, moderate speed (60–90 m/min) with heavy flood coolant; rating ≈40 % of AISI 1212.
Can C61800 be welded?
Readily GTAW/GMAW welded with matching ERCuAl-A2 filler; remove the alumina film mechanically or with AC/He cleaning and keep interpass temperature low.
Can C61800 be formed, bent or molded?
Hot work at 700–850 °C; cold bending is limited (fair formability), so anneal at 620–670 °C with fast cooling between severe cold-forming steps.
What surface finishes work on C61800?
Not anodisable — finish by machining/polishing to a golden lustre, or apply clear lacquer; electroplating requires thorough oxide removal and a nickel strike.
C61800 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 | 8.5 – 11 | 9.5 |
| Fe | 0.5 – 1.5 | 1 |
| Si | ≤ 0.1 | — |
| Zn | ≤ 0.02 | — |
| Pb | ≤ 0.02 | — |
| CuCu + named elements 99.5 % min | balance | — |
C61800-O60 — frequently asked
What is C61800-O60 used for?
C61800-O60 is typically used for marine fasteners, pump shafts, corrosion-resistant fittings and bushings. In short: general-purpose aluminum bronze; strong seawater resistance; weldable but gummy to machine.
What is the yield strength of C61800-O60?
C61800-O60 has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 52% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C61800-O60 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough, gummy chips — use rigid setups, sharp positive-rake carbide, moderate speed (60–90 m/min) with heavy flood coolant; rating ≈40 % of AISI 1212.
Can C61800-O60 be welded?
Yes — weldability is rated very good (70/100). Readily GTAW/GMAW welded with matching ERCuAl-A2 filler; remove the alumina film mechanically or with AC/He cleaning and keep interpass temperature low.
What surface finishes work on C61800-O60?
Not anodisable — finish by machining/polishing to a golden lustre, or apply clear lacquer; electroplating requires thorough oxide removal and a nickel strike.
Can C61800-O60 be formed, bent or molded?
Hot work at 700–850 °C; cold bending is limited (fair formability), so anneal at 620–670 °C with fast cooling between severe cold-forming steps.
What is the maximum service temperature of C61800-O60?
C61800-O60 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C61800-M30 and C61800-TQ50?
M30 is the default condition — the standard stocked condition for round bar, hex and shapes — balanced strength, ductility and cost. TQ50: use at the high-aluminium end of the range when maximum strength and wear resistance are needed for bushings, gears and valve stems. Yield strength is 275 MPa in M30 versus 450 MPa in TQ50.
Sources
- ASTM B150/B150M — Aluminum Bronze Rod, Bar and Shapes — ASTM International (2019)
- EN 12163 / CW305G copper alloy rod — CEN (2016)
- GB/T 4423 / GB/T 1176 (QAl9-4) — SAC (2020)
- CDA Alloy Datasheet C61800 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — 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.