Copper Alloy ERCuAl-A2 AW-SR
Heat-treated state
UNS C61800 · GB HSCuAl
AW-SR = 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 %.
Values for the AW-SR condition
Other ERCuAl-A2 tempers and conditions
ERCuAl-A2 is listed in 2 conditions; see the grade overview at ERCuAl-A2.
- AW-SR
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AW-SRThis page 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 |
What is ERCuAl-A2 AW-SR?
ERCuAl-A2 AW-SR is ERCuAl-A2 heat treated to 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 %. ERCuAl-A2 AW-SR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 28% and the elastic modulus is 117 GPa (17 Msi). ERCuAl-A2 AW-SR 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). AW is the default condition FabDigit quotes; AW-SR 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 — 76/100, better than 91% 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 AW-SR properties
Typical room-temperature values for ERCuAl-A2 AW-SR; 21 are specific to this condition. Other listed values are ERCuAl-A2 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
ERCuAl-A2 AW-SR 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 AW-SR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 28% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
ERCuAl-A2 AW-SR is rated for continuous service to 300°C (572 °F). It conducts heat at 60 W/m·K (34.7 BTU/hr·ft·°F), worse than 59% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
ERCuAl-A2 AW-SR conducts electricity at 13.5 % IACS, worse than 56% 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 ERCuAl-A2 AW-SR 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 AW-SR's machinability is poor (34/100, worse than 53% of copper alloy grades); weldability very good (72/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERCuAl-A2 AW-SR
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.
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.
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 | — |
ERCuAl-A2 AW-SR — frequently asked
What is ERCuAl-A2 AW-SR used for?
ERCuAl-A2 AW-SR 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 AW-SR?
ERCuAl-A2 AW-SR has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ERCuAl-A2 AW-SR easy to machine?
Not especially — machinability is rated poor (34/100, worse than 53% 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 AW-SR 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 AW-SR?
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 AW-SR 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 AW-SR?
ERCuAl-A2 AW-SR 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.