Copper Alloy CC765S-GS (Sand cast)
Finish state · default condition
EN CC765S
Default for one-off and medium-size housings, valve bodies and brackets where wall thickness varies.
Values for the GS condition
Other CC765S tempers and conditions
CC765S is listed in 4 conditions; see the grade overview at CC765S.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSDefaultThis page Sand cast | Default for one-off and medium-size housings, valve bodies and brackets where wall thickness varies. | 230 | 480 | 22 | 120 HB | 13 % IACS |
Permanent (chill) mould cast | Choose for repeat-production parts needing finer grain, tighter tolerances and ~10 % higher strength than sand casting. | 270 | 530 | 20 | 130 HB | 13 % IACS |
Centrifugally cast | Best for bushings, worm-wheel rims and large rings — dense, porosity-free wall with the highest strength of the standard forms. | 290 | 580 | 20 | 140 HB | 13 % IACS |
Continuously cast bar / tube | Standard stock form for machined nuts, sleeves and gear blanks — uniform dense structure, ready for turning from bar. | 290 | 570 | 20 | 140 HB | 13 % IACS |
What is CC765S-GS?
CC765S-GS is CC765S supplied in the GS condition — default for one-off and medium-size housings, valve bodies and brackets where wall thickness varies. CC765S-GS has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 100 GPa (14.5 Msi). CC765S-GS has a density of 8 g/cm³ (0.289 lb/in³), lighter than 87% of copper alloy grades. It melts at 880°C (1,616 °F).
Limitations
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 79% of copper alloy grades
CC765S-GS properties
Typical room-temperature values for CC765S-GS; 22 are specific to this condition. Other listed values are CC765S reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC765S-GS has a density of 8 g/cm³ (0.289 lb/in³), lighter than 87% of copper alloy grades. It melts at 880°C (1,616 °F).
Mechanical16
CC765S-GS has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
CC765S-GS is rated for continuous service to 200°C (392 °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 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
CC765S-GS conducts electricity at 13 % IACS, worse than 58% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of CC765S-GS takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
CC765S-GS's machinability is fair (45/100, better than 64% of copper alloy grades); weldability fair (40/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC765S-GS
Is CC765S easy to machine?
Turns and mills well with sharp carbide at moderate speed, but chips are tougher and tool wear higher than free-cutting brass — use positive rake, generous coolant and expect ~30–45 % of HPb59-1 productivity.
Can CC765S be welded?
Fusion welding is only fair: TIG/MIG with matching or Cu-Si filler, preheat 150–250 °C, remove Al/Zn oxide film and accept zinc fume plus some strength loss in the HAZ; brazing is preferred for repairs.
Can CC765S be formed, bent or molded?
Cast only (sand, chill, centrifugal, continuous); short freezing range gives good fluidity but needs directional solidification, generous risering and degassing to avoid gas porosity and Al dross.
What surface finishes work on CC765S?
Machined surfaces polish to a bright yellow finish; can be nickel/chrome plated after copper strike, or lacquered — no anodizing; avoid ammonia-containing cleaners to prevent stress-corrosion cracking.
CC765S 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 | 57 – 60 | 58.5 |
| Mn | 1 – 3 | 2 |
| Al | 0.5 – 2.5 | 1.2 |
| Fe | 0.5 – 2 | 1 |
| Niimpurity limit | ≤ 1 | — |
| Pbimpurity limit | ≤ 0.5 | — |
| Snimpurity limit | ≤ 0.4 | — |
| Siimpurity limit | ≤ 0.1 | — |
| Others (total) | ≤ 0.2 | — |
| Znbalance ≈ 34–38 % | balance | — |
CC765S-GS — frequently asked
What is CC765S-GS used for?
CC765S-GS is typically used for gears, hardware castings and marine fittings. In short: balanced-cost manganese brass; better machining than CC764S; mid-strength engineering castings.
What is the yield strength of CC765S-GS?
CC765S-GS has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 51% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC765S-GS easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Turns and mills well with sharp carbide at moderate speed, but chips are tougher and tool wear higher than free-cutting brass — use positive rake, generous coolant and expect ~30–45 % of HPb59-1 productivity.
Can CC765S-GS be welded?
With care — weldability is rated fair (40/100). Fusion welding is only fair: TIG/MIG with matching or Cu-Si filler, preheat 150–250 °C, remove Al/Zn oxide film and accept zinc fume plus some strength loss in the HAZ; brazing is preferred for repairs.
What surface finishes work on CC765S-GS?
Machined surfaces polish to a bright yellow finish; can be nickel/chrome plated after copper strike, or lacquered — no anodizing; avoid ammonia-containing cleaners to prevent stress-corrosion cracking.
Can CC765S-GS be formed, bent or molded?
Cast only (sand, chill, centrifugal, continuous); short freezing range gives good fluidity but needs directional solidification, generous risering and degassing to avoid gas porosity and Al dross.
What is the maximum service temperature of CC765S-GS?
CC765S-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 CC765S-GS and CC765S-GZ?
GS is the default condition — default for one-off and medium-size housings, valve bodies and brackets where wall thickness varies. GZ: best for bushings, worm-wheel rims and large rings — dense, porosity-free wall with the highest strength of the standard forms. Yield strength is 230 MPa in GS versus 290 MPa in GZ.
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 (C86200 manganese bronze, comparison) — Copper Development Association (2023)
- Werkstoff-Datenblätter Kupfer-Zink-Gusslegierungen — Deutsches Kupferinstitut (DKI) (2021)
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.