Copper Alloy C63200-O20
Heat-treated state
UNS C63200 · ASTM B150 · GB QAl10-5-5
O20 = hot forged and annealed
Choose when maximum ductility, toughness and dimensional stability (stress-relieved microstructure) matter more than peak strength.
Values for the O20 condition
Other C63200 tempers and conditions
C63200 is listed in 5 conditions; see the grade overview at C63200.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O20This page Hot forged and annealed | Choose when maximum ductility, toughness and dimensional stability (stress-relieved microstructure) matter more than peak strength. | 290 | 640 | 26 | 165 HB | — |
Hot rolled plate / flat bar | Plate and flat bar condition for wear plates, gib strips and marine fabrication blanks. | 320 | 655 | 20 | 180 HB | 7 % IACS |
As hot forged and air cooled | Standard condition for closed-die and open-die forgings such as valve bodies, flanges and pump wear rings. | 330 | 675 | 22 | 180 HB | — |
M30Default As hot extruded | Default stock condition for C63200 round bar and shapes: best balance of strength, ductility and price. | 345 | 690 | 20 | 187 HB | 7 % IACS |
Quench hardened and temper annealed | Highest strength and hardness condition (≈900 °C water quench + ~650 °C temper) for shafts, bushings and heavily loaded wear parts. | 450 | 780 | 14 | 21 HRC | — |
What is C63200-O20?
C63200-O20 is C63200 heat treated to O20 — choose when maximum ductility, toughness and dimensional stability (stress-relieved microstructure) matter more than peak strength. C63200-O20 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 117 GPa (17 Msi). C63200-O20 has a density of 7.64 g/cm³ (0.276 lb/in³), lighter than 92% of copper alloy grades. It melts at 1,044°C (1,911 °F). M30 is the default condition FabDigit quotes; O20 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 85/100, better than 100% of copper alloy grades
- Lightweight — 7.64 g/cm³ (0.276 lb/in³), better than 92% of copper alloy grades
- Tough — resists crack growth — 60 MPa·√m (54.6 ksi·√in), better than 90% 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
Limitations
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
- Poor heat conductor — 38 W/m·K (22 BTU/hr·ft·°F), worse than 84% of copper alloy grades
C63200-O20 properties
Typical room-temperature values for C63200-O20; 12 are specific to this condition. Other listed values are C63200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C63200-O20 has a density of 7.64 g/cm³ (0.276 lb/in³), lighter than 92% of copper alloy grades. It melts at 1,044°C (1,911 °F).
Mechanical14
C63200-O20 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C63200-O20 is rated for continuous service to 300°C (572 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 84% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C63200-O20 conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 100% of copper alloy grades.
Sustainability4
Producing a kilogram of C63200-O20 takes about 55 MJ of energy and emits 3.8 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C63200-O20's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (70/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C63200-O20
Is C63200 easy to machine?
Tough and gummy: use rigid setups, positive-rake carbide, 60–120 m/min, heavy feeds and flood coolant to avoid work hardening and built-up edge.
Can C63200 be welded?
GTAW/GMAW with matching aluminium-bronze filler (ERCuNiAl) works well; keep interpass temperature moderate, clean the alumina film mechanically, and avoid slow cooling through 300–500 °C.
Can C63200 be formed, bent or molded?
Hot work 800–900 °C (excellent forgeability); cold formability is poor, so bending needs generous radii or warm forming, and heavy cold work should be followed by annealing.
What surface finishes work on C63200?
Not anodisable — use light abrasive blast, passivation/oil, chemical blackening or wax for marine service; polishes to a bright gold tone that darkens naturally in seawater.
C63200 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 – 9.5 | 9 |
| Fe | 3 – 5 | 4 |
| Nisome purchase specs allow Ni to 5.5 %; Ni+Co counted together | 4 – 4.5 | 4.3 |
| Mn | 1.2 – 2 | 1.5 |
| Si | ≤ 0.1 | — |
| Pb | ≤ 0.02 | — |
| Curemainder, 82.2 % min per ASTM B150 | ≥ 82.2 (balance) | — |
C63200-O20 — frequently asked
What is C63200-O20 used for?
C63200-O20 is typically used for ship propellers, pump/valve components, marine hardware and seawater piping fittings. In short: standard marine aluminum bronze; cavitation and biofouling resistant; excellent hot forgeability.
What is the yield strength of C63200-O20?
C63200-O20 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 640 MPa (92.8 ksi) — stronger than 60% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C63200-O20 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough and gummy: use rigid setups, positive-rake carbide, 60–120 m/min, heavy feeds and flood coolant to avoid work hardening and built-up edge.
Can C63200-O20 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with matching aluminium-bronze filler (ERCuNiAl) works well; keep interpass temperature moderate, clean the alumina film mechanically, and avoid slow cooling through 300–500 °C.
What surface finishes work on C63200-O20?
Not anodisable — use light abrasive blast, passivation/oil, chemical blackening or wax for marine service; polishes to a bright gold tone that darkens naturally in seawater.
Can C63200-O20 be formed, bent or molded?
Hot work 800–900 °C (excellent forgeability); cold formability is poor, so bending needs generous radii or warm forming, and heavy cold work should be followed by annealing.
What is the maximum service temperature of C63200-O20?
C63200-O20 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 C63200-M30 and C63200-TQ50?
M30 is the default condition — default stock condition for C63200 round bar and shapes: best balance of strength, ductility and price. TQ50: highest strength and hardness condition (≈900 °C water quench + ~650 °C temper) for shafts, bushings and heavily loaded wear parts. Yield strength is 345 MPa in M30 versus 450 MPa in TQ50.
Sources
- ASTM B150/B150M — Aluminum Bronze Rod, Bar, and Shapes — ASTM International (2019)
- CDA Alloy Datasheet C63200 — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
- Nickel-aluminium bronze bar and forging datasheet — Aviva Metals / Concast (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.