Copper Alloy CC766S
EN CC766S
CC766S (CuZn37Al1-C) is an aluminium-alloyed cast brass with about 1 % Al added to a 37 % zinc base, giving higher strength and better corrosion resistance than plain yellow cast brass at 155 MPa yield, 400 MPa tensile, 20 % elongation and 95 HB.
Reference datasheet — CC766S 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 GS condition
CC766S tempers and conditions
CC766S is supplied in 4 conditions, soft to hard. GS is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSDefault Sand cast | Default general-engineering condition: one-off and low-volume castings, thick sections, largest parts. | 155 | 400 | 20 | 95 HB | 22 % IACS |
Gravity die cast | Choose for repeat production of small/medium parts: finer grain, higher strength and better surface than sand casting. | 175 | 440 | 16 | 105 HB | 22 % IACS |
Centrifugally cast | Pick for rings, bushes, sleeves and hollow bodies needing dense, porosity-free walls. | 180 | 450 | 16 | 105 HB | 22 % IACS |
Continuously cast bar/tube | Semi-finished bar, tube and hollow stock for machined components; most uniform structure and best machining stock removal. | 185 | 450 | 15 | 110 HB | 22.5 % IACS |
What is CC766S?
CC766S (CuZn37Al1-C) is an aluminium-alloyed cast brass with about 1 % Al added to a 37 % zinc base, giving higher strength and better corrosion resistance than plain yellow cast brass at 155 MPa yield, 400 MPa tensile, 20 % elongation and 95 HB. It is used for general engineering and water-side castings in sand, chill, centrifugal and continuous forms (GS, GM, GZ, GC), with 22 % IACS electrical conductivity. The alloy is essentially unleaded, so its machinability rating is 45, fusion welding is difficult because of zinc loss and aluminium oxide, and cold formability is negligible. CC767S is the higher-ductility alternative in the same group. CC766S has a density of 8.35 g/cm³ (0.302 lb/in³), lighter than 77% of copper alloy grades. It melts at 885°C (1,625 °F). CC766S has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 95 GPa (13.8 Msi).
What is CC766S used for?
- water fittings
- hardware castings
- general engineering parts
Limitations
- Low stiffness — 95 GPa (13.8 Msi), worse than 93% of copper alloy grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 79% of copper alloy grades
CC766S properties
Typical room-temperature values for CC766S-GS; bars are the position among copper alloy grades.
Physical3
CC766S has a density of 8.35 g/cm³ (0.302 lb/in³), lighter than 77% of copper alloy grades. It melts at 885°C (1,625 °F).
Mechanical15
CC766S has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
CC766S is rated for continuous service to 200°C (392 °F). It conducts heat at 102 W/m·K (58.9 BTU/hr·ft·°F), better than 55% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
CC766S conducts electricity at 22 % IACS, better than 55% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (56/100), worse than 81% of copper alloy grades.
Sustainability4
Producing a kilogram of CC766S takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
CC766S's machinability is fair (45/100, better than 64% of copper alloy grades); weldability fair (35/100); formability poor (30/100).
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. CC766S is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC766S
Is CC766S easy to machine?
Machines like a medium-duty unleaded brass (~45 % of free-cutting brass): use sharp positive-rake carbide, high speed, light feeds and generous coolant to avoid gummy chips.
Can CC766S be welded?
Fusion welding is difficult — zinc volatilises and the Al oxide film traps slag; prefer TIG with Al-bronze/Si-bronze filler, preheat 150–200 °C, or repair by brazing with strong fluxing.
Can CC766S be formed, bent or molded?
A foundry alloy: pour at ~1000–1050 °C with good degassing and chills, allow generous fillets; the as-cast duplex structure has little cold formability, so shape by casting/machining.
CC766S 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 |
|---|---|---|
| Cu | 60 – 65 | 62 |
| Alprincipal strengthener; forms protective oxide film | 0.5 – 1.5 | 1 |
| Mn | ≤ 0.5 | 0.2 |
| Fe | ≤ 0.8 | 0.3 |
| Ni | ≤ 0.5 | |
| Sn | ≤ 0.4 | |
| Pbimpurity level only; not a free-cutting alloy | ≤ 0.5 | |
| Si | ≤ 0.1 | |
| Znremainder, nominally ~37 % | balance |
What surface finishes work on CC766S?
Polishes and buffs to a bright brass tone, takes Ni/Cr and Sn plating after Al-oxide removal (acid or cyanide-free activation); not anodisable — protect with lacquer or patination for outdoor use.
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 CC766S in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuZn37AI1-C
How much does CC766S cost?
CC766S is a premium-cost copper alloy ($$$), cheaper than about 51% 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.
CC766S — frequently asked
What is CC766S used for?
CC766S is typically used for water fittings, hardware castings and general engineering parts. In short: aluminium-strengthened yellow brass; general-purpose cast brass; medium-duty unleaded machining.
What is the yield strength of CC766S?
CC766S has a typical yield strength of 155 MPa (22.5 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 65% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC766S easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines like a medium-duty unleaded brass (~45 % of free-cutting brass): use sharp positive-rake carbide, high speed, light feeds and generous coolant to avoid gummy chips.
Can CC766S be welded?
With care — weldability is rated fair (35/100). Fusion welding is difficult — zinc volatilises and the Al oxide film traps slag; prefer TIG with Al-bronze/Si-bronze filler, preheat 150–200 °C, or repair by brazing with strong fluxing.
What surface finishes work on CC766S?
Polishes and buffs to a bright brass tone, takes Ni/Cr and Sn plating after Al-oxide removal (acid or cyanide-free activation); not anodisable — protect with lacquer or patination for outdoor use.
Can CC766S be formed, bent or molded?
A foundry alloy: pour at ~1000–1050 °C with good degassing and chills, allow generous fillets; the as-cast duplex structure has little cold formability, so shape by casting/machining.
What is the maximum service temperature of CC766S?
CC766S is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC766S-GS and CC766S-GC?
GS is the default condition — default general-engineering condition: one-off and low-volume castings, thick sections, largest parts. GC: semi-finished bar, tube and hollow stock for machined components; most uniform structure and best machining stock removal. Yield strength is 155 MPa in GS versus 185 MPa in GC.
How much does CC766S cost?
CC766S is a premium-cost copper alloy ($$$), cheaper than about 51% 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
- EN 1982 — Copper and copper alloys: Ingots and castings — CEN (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper alloy datasheets (cast brasses) — Copper Development Association (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.