Copper Alloy CC767S-GS (Sand cast)
Finish state · default condition
EN CC767S
Standard route for one-offs, large or complex housings and valve bodies; lowest strength but highest ductility.
Values for the GS condition
Other CC767S tempers and conditions
CC767S is listed in 4 conditions; see the grade overview at CC767S.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSDefaultThis page Sand cast | Standard route for one-offs, large or complex housings and valve bodies; lowest strength but highest ductility. | 150 | 400 | 32 | 80 HB | 20 % IACS |
Permanent (metal) mould cast | Choose for medium/large series parts needing finer grain, better surface and higher strength than sand casting. | 180 | 450 | 22 | 95 HB | 20 % IACS |
Centrifugally cast | Best for rings, bushings, sleeves and flanges where a dense, porosity-free wall is required. | 190 | 450 | 20 | 100 HB | 20 % IACS |
Continuously cast bar / tube | Semi-finished bar, hollow bar and tube stock for machined pressure-tight components; most uniform properties. | 200 | 460 | 20 | 105 HB | 20 % IACS |
What is CC767S-GS?
CC767S-GS is CC767S supplied in the GS condition — standard route for one-offs, large or complex housings and valve bodies; lowest strength but highest ductility. CC767S-GS has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 100 GPa (14.5 Msi). CC767S-GS has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 880°C (1,616 °F).
Advantages
- Low embodied carbon — 3.1 kg CO₂/kg, better than 95% of copper alloy grades
- Ductile — tolerates forming and impact — 32%, better than 77% of copper alloy grades
Limitations
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
CC767S-GS properties
Typical room-temperature values for CC767S-GS; 20 are specific to this condition. Other listed values are CC767S reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC767S-GS has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 880°C (1,616 °F).
Mechanical14
CC767S-GS has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
CC767S-GS is rated for continuous service to 200°C (392 °F). It conducts heat at 105 W/m·K (60.7 BTU/hr·ft·°F), better than 56% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
CC767S-GS conducts electricity at 20 % IACS, better than 52% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of CC767S-GS takes about 47 MJ of energy and emits 3.1 kg of CO₂ — less than 93% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
CC767S-GS's machinability is fair (45/100, better than 64% of copper alloy grades); weldability fair (40/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC767S-GS
Is CC767S easy to machine?
Machines well with sharp positive-rake carbide and light feeds, but being essentially unleaded it produces stringy chips — expect ~40–50% of free-cutting HPb59-1 productivity.
Can CC767S be welded?
Fusion welding is limited by zinc volatilisation; use TIG with Cu-Si or Cu-Al filler, preheat lightly and provide fume extraction — silver brazing and soldering are preferred for joints.
Can CC767S be formed, bent or molded?
A casting alloy: excellent fluidity and pressure tightness in sand, permanent-mould, centrifugal and continuous casting; provide generous feeding and avoid overheating to limit Zn loss and coarse β grains.
What surface finishes work on CC767S?
Polishes to a bright yellow finish and takes nickel/chrome, tin or clear-lacquer coatings; use benzotriazole or chromate passivation for tarnish control — anodizing is not applicable.
CC767S 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 |
|---|---|---|
| Cuα-β brass matrix | 57 – 63 | 60 |
| Alstrengthener, improves fluidity and oxidation resistance | 0.3 – 1.3 | 0.8 |
| Fe | ≤ 0.8 | — |
| Mn | ≤ 0.5 | — |
| Ni | ≤ 1 | — |
| Sn | ≤ 0.4 | — |
| Pbmax; low-lead alloy | ≤ 0.5 | — |
| Si | ≤ 0.1 | — |
| Znremainder, ≈37–40% | balance | — |
CC767S-GS — frequently asked
What is CC767S-GS used for?
CC767S-GS is typically used for pump housings, valve bodies and structural castings. In short: most ductile aluminium cast brass; pressure-tight casting alloy; good fluidity, unleaded machining.
What is the yield strength of CC767S-GS?
CC767S-GS has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 69% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC767S-GS easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines well with sharp positive-rake carbide and light feeds, but being essentially unleaded it produces stringy chips — expect ~40–50% of free-cutting HPb59-1 productivity.
Can CC767S-GS be welded?
With care — weldability is rated fair (40/100). Fusion welding is limited by zinc volatilisation; use TIG with Cu-Si or Cu-Al filler, preheat lightly and provide fume extraction — silver brazing and soldering are preferred for joints.
What surface finishes work on CC767S-GS?
Polishes to a bright yellow finish and takes nickel/chrome, tin or clear-lacquer coatings; use benzotriazole or chromate passivation for tarnish control — anodizing is not applicable.
Can CC767S-GS be formed, bent or molded?
A casting alloy: excellent fluidity and pressure tightness in sand, permanent-mould, centrifugal and continuous casting; provide generous feeding and avoid overheating to limit Zn loss and coarse β grains.
What is the maximum service temperature of CC767S-GS?
CC767S-GS 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 CC767S-GS and CC767S-GC?
GS is the default condition — standard route for one-offs, large or complex housings and valve bodies; lowest strength but highest ductility. GC: semi-finished bar, hollow bar and tube stock for machined pressure-tight components; most uniform properties. Yield strength is 150 MPa in GS versus 200 MPa in GC.
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 (CDA/copper.org) — Copper Development Association (2023)
- Cast copper alloy (special brass) foundry datasheets — European copper-alloy foundries (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.