Copper Alloy CC762S-GS (Sand cast)
Finish state · default condition
EN CC762S
Standard route for one-off and medium-size heavy sections such as worm-gear rims, nuts and bearing housings.
Values for the GS condition
Other CC762S tempers and conditions
CC762S is listed in 4 conditions; see the grade overview at CC762S.
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-off and medium-size heavy sections such as worm-gear rims, nuts and bearing housings. | 470 | 780 | 12 | 200 HB | 8 % IACS |
Permanent (metal) mould cast | Choose for repeat mid-volume parts needing finer grain, tighter dimensions and slightly higher strength than sand cast. | 490 | 810 | 12 | 210 HB | 8 % IACS |
Centrifugally cast | Best for large bushings, ring gears and cylinder liners where a dense, porosity-free wall is required. | 490 | 820 | 13 | 210 HB | 8 % IACS |
Continuous cast | Stock bar and tube form for machined nuts, slides and wear plates; highest yield strength with slightly lower ductility. | 510 | 800 | 10 | 215 HB | 8 % IACS |
What is CC762S-GS?
CC762S-GS is CC762S supplied in the GS condition — standard route for one-off and medium-size heavy sections such as worm-gear rims, nuts and bearing housings. CC762S-GS has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 100 GPa (14.5 Msi). CC762S-GS has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 870°C (1,598 °F).
Advantages
- High strength — 470 MPa (68.2 ksi), better than 87% of copper alloy grades
Limitations
- Needs corrosion protection — 52/100, worse than 93% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Limited formability — 12/100, worse than 85% of copper alloy grades
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
CC762S-GS properties
Typical room-temperature values for CC762S-GS; 21 are specific to this condition. Other listed values are CC762S reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC762S-GS has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 870°C (1,598 °F).
Mechanical15
CC762S-GS has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
CC762S-GS is rated for continuous service to 200°C (392 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
CC762S-GS conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 93% of copper alloy grades.
Sustainability4
Producing a kilogram of CC762S-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
CC762S-GS's machinability is poor (26/100, worse than 81% of copper alloy grades); weldability poor (28/100); formability not recommended (12/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC762S-GS
Is CC762S easy to machine?
Tough, gummy β-brass with hard Fe/Mn particles — use rigid setups, sharp carbide (K10/K20) with positive rake, moderate speed (60–120 m/min), heavy flood coolant; chips are stringy, so chip-breaking geometry helps.
Can CC762S be welded?
Poor fusion weldability: Al/Mn oxide films and Zn fuming cause porosity; if repair is unavoidable use GTAW with aluminium-bronze filler, preheat 150–250 °C, thorough oxide removal, and avoid welding on stress-loaded sections.
Can CC762S be formed, bent or molded?
Cast-only alloy — no cold forming; pour 980–1050 °C with clean, degassed melt, generous chills/risers and directional solidification to avoid shrinkage porosity in heavy sections; stress-relieve 250–300 °C before final machining.
What surface finishes work on CC762S?
Not anodisable; finish by machining/grinding, then chemical blackening, chromate/benzotriazole tarnish inhibitors, tin or nickel plating for contact surfaces, or paint on non-wear areas.
CC762S 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 |
|---|---|---|
| Cumatrix former; balance in some national specs | 60 – 66 | 63 |
| Alβ-phase stabiliser / main strengthener (C86300 allows up to 7.5) | 4 – 6 | 5 |
| Mnsolid-solution strengthening, deoxidiser | 2.5 – 5 | 4 |
| Fegrain refiner, forms hard Fe-rich particles for wear resistance | 2 – 4 | 3 |
| Niimpurity limit | ≤ 1 | — |
| Snimpurity limit | ≤ 0.2 | — |
| Pbimpurity limit | ≤ 0.2 | — |
| Siimpurity limit | ≤ 0.1 | — |
| Zn | ≥ 22 (balance) | — |
CC762S-GS — frequently asked
What is CC762S-GS used for?
CC762S-GS is typically used for marine propeller hubs, gears, heavy-duty bushings and structural castings. In short: strongest cast brass grade; manganese-bronze type; 200 HB wear surfaces.
What is the yield strength of CC762S-GS?
CC762S-GS has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC762S-GS easy to machine?
Not especially — machinability is rated poor (26/100, worse than 81% of copper alloy grades). Tough, gummy β-brass with hard Fe/Mn particles — use rigid setups, sharp carbide (K10/K20) with positive rake, moderate speed (60–120 m/min), heavy flood coolant; chips are stringy, so chip-breaking geometry helps.
Can CC762S-GS be welded?
Not readily — weldability is rated poor (28/100). Poor fusion weldability: Al/Mn oxide films and Zn fuming cause porosity; if repair is unavoidable use GTAW with aluminium-bronze filler, preheat 150–250 °C, thorough oxide removal, and avoid welding on stress-loaded sections.
What surface finishes work on CC762S-GS?
Not anodisable; finish by machining/grinding, then chemical blackening, chromate/benzotriazole tarnish inhibitors, tin or nickel plating for contact surfaces, or paint on non-wear areas.
Can CC762S-GS be formed, bent or molded?
Cast-only alloy — no cold forming; pour 980–1050 °C with clean, degassed melt, generous chills/risers and directional solidification to avoid shrinkage porosity in heavy sections; stress-relieve 250–300 °C before final machining.
What is the maximum service temperature of CC762S-GS?
CC762S-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 CC762S-GS and CC762S-GC?
GS is the default condition — standard route for one-off and medium-size heavy sections such as worm-gear rims, nuts and bearing housings. GC: stock bar and tube form for machined nuts, slides and wear plates; highest yield strength with slightly lower ductility. Yield strength is 470 MPa in GS versus 510 MPa in GC.
Sources
- EN 1982 — Copper and copper alloys: ingots and castings — CEN (2017)
- ASTM B505/B505M — Copper alloy continuous castings (C86300) — ASTM (2018)
- CDA alloy datasheet C86300 (Manganese Bronze A / high-strength) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.