Copper Alloy ERCuAl-A2
UNS C61800 · GB HSCuAl
ERCuAl-A2 is a copper-aluminum filler (~9% Al) with an iron addition, C61800 in the AWS A5.7 family, used to weld aluminum bronze castings and to overlay components needing wear and corrosion resistance.
Reference datasheet — ERCuAl-A2 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 AW condition
ERCuAl-A2 tempers and conditions
ERCuAl-A2 is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded plus stress relief | Pick for thick-wall weld repairs that must shed residual stress and resist stress-corrosion cracking in ammonia service; the 350–400 °C soak drops strength to 550 MPa and raises elongation to 28 %. | 250 | 550 | 28 | 140 HB | 13.5 % IACS |
AWDefault As-welded deposit | Default deposit state: multi-pass GMAW/GTAW all-weld metal with no post-weld heat treatment, for repairing aluminium-bronze castings and joining dissimilar copper alloys at 585 MPa. | 270 | 585 | 25 | 150 HB | 13 % IACS |
Supply forms, finishes and certifications
Ways ERCuAl-A2 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE | As-drawn bare wire / cut rod | Supply form |
OVERLAY | Hardfacing / cladding deposit on steel | Coating |
What is ERCuAl-A2?
ERCuAl-A2 is a copper-aluminum filler (~9% Al) with an iron addition, C61800 in the AWS A5.7 family, used to weld aluminum bronze castings and to overlay components needing wear and corrosion resistance. As-welded values are 585 MPa tensile, 270 MPa yield, 25% elongation, 150 HB (82 HRB), 59 W/m·K, 13% IACS and service to 300 °C; supplied as spool and rod wire, overlay wire and in stress-relieved condition. The tenacious alumina film must be removed between passes and the deposit cold-forms poorly. ERCuAl-A3 is the harder choice when wear resistance outweighs ductility. ERCuAl-A2 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,030°C (1,886 °F). ERCuAl-A2 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
What is ERCuAl-A2 used for?
- aluminum bronze pump/valve repair
- overlay hardfacing
- marine propeller welding
- dissimilar steel-to-bronze joints
Advantages
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Good corrosion resistance — 74/100, better than 88% of copper alloy grades
- Readily welded — 72/100, better than 88% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
ERCuAl-A2 properties
Typical room-temperature values for ERCuAl-A2-AW; bars are the position among copper alloy grades.
Physical3
ERCuAl-A2 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical13
ERCuAl-A2 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
ERCuAl-A2 is rated for continuous service to 300°C (572 °F). It conducts heat at 59 W/m·K (34.1 BTU/hr·ft·°F), worse than 61% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
ERCuAl-A2 conducts electricity at 13 % IACS, worse than 58% 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 ERCuAl-A2 takes about 58 MJ of energy and emits 3.9 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
ERCuAl-A2's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability very good (72/100); formability fair (45/100).
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. ERCuAl-A2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERCuAl-A2
Is ERCuAl-A2 easy to machine?
The deposit is hard and tough. Use sharp positive-rake carbide at moderate speed with adequate feed and generous coolant; avoid rubbing, which work-hardens the surface.
Can ERCuAl-A2 be welded?
GMAW spray transfer or GTAW DCEN with argon or argon-helium. Hold interpass temperature below 150 °C, strip the aluminum oxide film from the groove and between passes; thin sections normally need no preheat.
Can ERCuAl-A2 be formed, bent or molded?
Wire is produced by cold drawing with intermediate annealing. Deposit ductility is fair but cold formability is limited, so machine overlays to shape rather than cold bending them.
ERCuAl-A2 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 |
|---|---|---|
| AlAWS A5.7 ERCuAl-A2 / C61800 | 8.5 – 11 | 9.5 |
| Fe | 0.5 – 1.5 | 1 |
| Si | ≤ 0.1 | |
| Pb | ≤ 0.02 | |
| Zn | ≤ 0.02 | |
| Sn | ≤ 0.1 | |
| Mnmax (producer practice) | ≤ 0.5 | |
| Nimax (counted with Co in some editions) | ≤ 0.5 | |
| Other, totaltotal of other elements | ≤ 0.5 | |
| Cubalance, approx. 88-90% | balance |
What surface finishes work on ERCuAl-A2?
Polishes to a golden colour and forms a protective alumina film in seawater. Not anodizable — use chemical passivation, paint or nickel plating where a sealed surface is needed.
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 ERCuAl-A2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- C61800
- GB (China)
- HSCuAl
How much does ERCuAl-A2 cost?
ERCuAl-A2 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.
ERCuAl-A2 — frequently asked
What is ERCuAl-A2 used for?
ERCuAl-A2 is typically used for aluminum bronze pump/valve repair, overlay hardfacing, marine propeller welding and dissimilar steel-to-bronze joints. In short: strong wear-resistant copper filler; seawater-tolerant overlay; balanced strength and ductility.
What is the yield strength of ERCuAl-A2?
ERCuAl-A2 has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 56% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ERCuAl-A2 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). The deposit is hard and tough. Use sharp positive-rake carbide at moderate speed with adequate feed and generous coolant; avoid rubbing, which work-hardens the surface.
Can ERCuAl-A2 be welded?
Yes — weldability is rated very good (72/100). GMAW spray transfer or GTAW DCEN with argon or argon-helium. Hold interpass temperature below 150 °C, strip the aluminum oxide film from the groove and between passes; thin sections normally need no preheat.
What surface finishes work on ERCuAl-A2?
Polishes to a golden colour and forms a protective alumina film in seawater. Not anodizable — use chemical passivation, paint or nickel plating where a sealed surface is needed.
Can ERCuAl-A2 be formed, bent or molded?
Wire is produced by cold drawing with intermediate annealing. Deposit ductility is fair but cold formability is limited, so machine overlays to shape rather than cold bending them.
What is the maximum service temperature of ERCuAl-A2?
ERCuAl-A2 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 ERCuAl-A2-AW and ERCuAl-A2 AW-SR?
AW is the default condition — default deposit state: multi-pass GMAW/GTAW all-weld metal with no post-weld heat treatment, for repairing aluminium-bronze castings and joining dissimilar copper alloys at 585 MPa. AW-SR: pick for thick-wall weld repairs that must shed residual stress and resist stress-corrosion cracking in ammonia service; the 350–400 °C soak drops strength to 550 MPa and raises elongation to 28 %. Yield strength is 270 MPa in AW versus 250 MPa in AW-SR.
How much does ERCuAl-A2 cost?
ERCuAl-A2 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
- AWS A5.7/A5.7M Specification for Copper and Copper-Alloy Bare Welding Rods and Electrodes — AWS (2021)
- C61800 Aluminum Bronze alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B: Corrosion — Materials — ASM International (2005)
- Aluminium bronze filler metal (ERCuAl-A2 / Alloy 630) product data — welding consumable producers (2023)
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.