Copper Alloy C61300
UNS C61300
C61300 is a wrought aluminium bronze from the C50000–C69999 family (also designated QAl7), strengthened by aluminium with a small tin addition that stabilises the protective surface oxide.
Reference datasheet — C61300 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M20 condition
C61300 tempers and conditions
C61300 is supplied in 6 conditions, soft to hard. M20 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Softest condition — pick for maximum ductility in severe forming, spinning or heavy cold bending. | 205 | 515 | 45 | 128 HB | — |
Hot rolled and annealed | Hot-rolled plate given a full anneal — used for condenser tube sheets and marine plate that must be flat, tough and weld-ready. | 215 | 525 | 43 | 133 HB | — |
Annealed | General-purpose annealed plate, sheet and tube; best combination of ductility and dimensional stability for forming and welding. | 220 | 530 | 42 | 135 HB | — |
As-welded deposit | Use for design of overlays and joints made with C61300/ERCuAl-A2 filler; as-deposited metal is slightly stronger and less ductile than annealed plate. | 260 | 540 | 30 | 145 HB | 10.5 % IACS |
M20Default As hot rolled | Standard stocked mill condition for plate, bar and shapes — good strength with ample ductility, no extra heat treatment cost. | 275 | 550 | 35 | 150 HB | — |
Drawn and stress relieved | Highest-strength stocked condition for rod, bar and fasteners — cold drawn then stress relieved for straightness and low residual stress. | 400 | 585 | 28 | 170 HB | — |
What is C61300?
C61300 is a wrought aluminium bronze from the C50000–C69999 family (also designated QAl7), strengthened by aluminium with a small tin addition that stabilises the protective surface oxide. Engineers specify it for a balance of 550 MPa tensile strength, 275 MPa yield, 35% elongation and 150 HB hardness with a corrosion resistance score of 74, supplied as bar, plate, tube, and forged fittings for seawater service. It welds readily with ERCuAl-A2 filler but machines at only about 33 on the free-cutting brass scale, so cycle times and tooling cost are higher than for leaded brass. Where more strength and wear resistance are needed, the iron-modified C61400 is the nearest alternative. C61300 has a density of 7.89 g/cm³ (0.285 lb/in³), lighter than 89% of copper alloy grades. It melts at 1,038°C (1,900 °F). C61300 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 35% and the elastic modulus is 117 GPa (17 Msi).
What is C61300 used for?
- marine fasteners
- condenser tubing
- structural fittings
- bolts and rivets
Advantages
- Readily welded — 78/100, better than 91% of copper alloy grades
- Good corrosion resistance — 74/100, better than 88% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Ductile — tolerates forming and impact — 35%, better than 80% of copper alloy grades
C61300 properties
Typical room-temperature values for C61300-M20; bars are the position among copper alloy grades.
Physical3
C61300 has a density of 7.89 g/cm³ (0.285 lb/in³), lighter than 89% of copper alloy grades. It melts at 1,038°C (1,900 °F).
Mechanical13
C61300 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 35% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61300 is rated for continuous service to 300°C (572 °F). It conducts heat at 62 W/m·K (35.8 BTU/hr·ft·°F), worse than 58% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C61300 conducts electricity at 10.9 % IACS, worse than 71% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 88% of copper alloy grades.
Sustainability4
Producing a kilogram of C61300 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C61300's machinability is poor (33/100, worse than 53% of copper alloy grades); weldability very good (78/100); 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 copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C61300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C61300
Is C61300 easy to machine?
Machines like a tough, gummy alloy at ~30 % of free-cutting brass: use sharp positive-rake carbide, slow-to-moderate speed, heavy feed and generous coolant to avoid work hardening and built-up edge.
Can C61300 be welded?
Readily GTAW/GMAW welded with ERCuAl-A2 filler, DCEN/AC with argon; preheat 150–200 °C on thick sections, keep interpass low, wire-brush the tenacious alumina film before each pass and avoid oxidizing flames in gas welding.
Can C61300 be formed, bent or molded?
Hot work 700–900 °C; cold form in the O60/O61 temper with generous radii and interstage anneals at 600–700 °C — cold work rate is high, so tooling loads exceed those for brass.
C61300 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 | 6 – 7.5 | 7 |
| Fe | 2 – 3 | 2.5 |
| Snsuppresses dealuminification in seawater | 0.2 – 0.5 | 0.35 |
| Mn | ≤ 0.2 | |
| Ni | ≤ 0.15 | |
| Si | ≤ 0.1 | |
| Zn | ≤ 0.1 | |
| Pb | ≤ 0.01 | |
| Cu88.5 % min, including Ag | balance |
What surface finishes work on C61300?
Not anodizable; polishes to a warm gold sheen but films quickly — passivate/lacquer for appearance, or use as-is in seawater where the protective Al-Sn oxide film is the corrosion barrier. Nickel or chrome plating requires careful alkaline/acid activation of the oxide film.
Surface treatments FabDigit runs on copper 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 Copper Alloy C61300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- ERCuAl-A2
- Similar grades
- QAl7
How much does C61300 cost?
C61300 is a high-cost copper alloy ($$$$), pricier than about 78% 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.
C61300 — frequently asked
What is C61300 used for?
C61300 is typically used for marine fasteners, condenser tubing, structural fittings and bolts and rivets. In short: weldable aluminum bronze; tough marine hardware alloy; machines slower than brass.
What is the yield strength of C61300?
C61300 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 57% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C61300 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 53% of copper alloy grades). Machines like a tough, gummy alloy at ~30 % of free-cutting brass: use sharp positive-rake carbide, slow-to-moderate speed, heavy feed and generous coolant to avoid work hardening and built-up edge.
Can C61300 be welded?
Yes — weldability is rated very good (78/100). Readily GTAW/GMAW welded with ERCuAl-A2 filler, DCEN/AC with argon; preheat 150–200 °C on thick sections, keep interpass low, wire-brush the tenacious alumina film before each pass and avoid oxidizing flames in gas welding.
What surface finishes work on C61300?
Not anodizable; polishes to a warm gold sheen but films quickly — passivate/lacquer for appearance, or use as-is in seawater where the protective Al-Sn oxide film is the corrosion barrier. Nickel or chrome plating requires careful alkaline/acid activation of the oxide film.
Can C61300 be formed, bent or molded?
Hot work 700–900 °C; cold form in the O60/O61 temper with generous radii and interstage anneals at 600–700 °C — cold work rate is high, so tooling loads exceed those for brass.
What is the maximum service temperature of C61300?
C61300 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 C61300-M20 and C61300-HR50?
M20 is the default condition — standard stocked mill condition for plate, bar and shapes — good strength with ample ductility, no extra heat treatment cost. HR50: highest-strength stocked condition for rod, bar and fasteners — cold drawn then stress relieved for straightness and low residual stress. Yield strength is 275 MPa in M20 versus 400 MPa in HR50.
How much does C61300 cost?
C61300 is a high-cost copper alloy ($$$$), pricier than about 78% 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.
Sources
- ASTM B150/B150M — Aluminum Bronze Rod, Bar, and Shapes — ASTM International (2019)
- ASTM B171/B171M — Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers and Heat Exchangers — ASTM International (2018)
- AWS A5.7/A5.7M — Copper and Copper-Alloy Bare Welding Rods and Electrodes (ERCuAl-A2) — AWS (2007)
- Standards Designation & Alloy Datasheet C61300 — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties and Selection: 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; 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.