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CC770S Aluminium Brass Casting
CC770S Aluminium Brass Casting – CuZn25Al5
CC770S Aluminium Brass Casting – CuZn25Al5
CC770S (EN 1982 / CuZn25Al5-C) is an aluminium-bearing brass casting alloy with significant aluminium (4–6%) additions that produce a multi-phase microstructure (alpha + kappa phases) delivering high strength (420 MPa), excellent erosion-corrosion resistance, and improved seawater resistance compared to standard yellow brass or naval brass. CC770S is used for impellers in high-velocity pumping applications, marine trim, and structural components where both strength and resistance to impingement attack are required.
Alloy Overview
The 4–6% aluminium addition in CC770S creates alpha + kappa (AlCu₃) phase intermetallics in the microstructure, increasing tensile strength to 420 MPa and significantly improving erosion-corrosion resistance (critical in high-velocity fluid handling). The aluminium also forms a protective Al₂O₃ surface film enhancing atmospheric and seawater corrosion resistance. CC770S is harder (90–120 HB) than standard yellow brass and requires carbide or coated tooling for machining.
Material Composition
| Element | Min % | Max % | Typical % | Role |
|---|---|---|---|---|
| Copper (Cu) | 69.0 | 73.0 | 71.0 | Primary matrix |
| Zinc (Zn) | Balance | Balance | ~24.0 | Strength, castability |
| Aluminium (Al) | 4.0 | 6.0 | 5.0 | Strengthener, kappa phase, corrosion |
| Manganese (Mn) | 1.0 | 4.0 | 2.0 | Strengthener, grain refiner |
| Iron (Fe) | 0.5 | 2.5 | 1.0 | Grain refiner |
| Nickel (Ni) | – | 1.0 | 0.3 | Toughness |
| Lead (Pb) | – | 0.30 | – | Impurity limit |
| Tin (Sn) | – | 0.20 | – | Minor |
| Silicon (Si) | – | 0.10 | – | Impurity |
| Phosphorus (P) | – | 0.05 | – | Deoxidant |
Mechanical Properties
| Property | Sand Cast | Die Cast | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 420 min | 490 min | ASTM B584/EN 1982 |
| Yield Strength (MPa) | 160 | 200 | ASTM E8 |
| Elongation (%) | 18% | 20% | ASTM E8 |
| Hardness (HB) | 90–120 | ASTM E10 | |
| Density (g/cm³) | 8.42 | – | |
| Electrical Conductivity (%IACS) | 8–12 | – | |
| Melting Range (°C) | 880–1000 | – | |
| Machinability (%) | 30 | CDA scale | |
International Equivalent Grades
| Standard | Designation | Name |
|---|---|---|
| Europe (EN 1982) | CC770S | CuZn25Al5-C – Aluminium Brass Casting |
| USA (ASTM B584) | C87200 / CDA 872 (nearest) | Silicon Brass / Al Brass |
| Germany (DIN 1709) | CuZn22Al3-C (nearest) | Al-Sondermessing |
| UK (BS 1400) | HTB3 (nearest) | High Tensile Brass 3 |
| India (IS 318) | HTB3 | Aluminium Brass Grade 3 |
| Japan (JIS H5111) | HBsC3 (nearest) | High Strength Brass 3 |
| ISO | CuZn25Al5-C | Aluminium Brass Casting |
| China (GB/T 1176) | ZCuZn26Al4Fe3Mn3 | 铝黄铜 (Aluminium Brass) |
Applications
CC770S aluminium brass castings: high-velocity pump impellers and casings (erosion-corrosion resistance); marine propellers for performance craft; structural marine hardware requiring higher strength than naval brass; seawater desalination plant components; industrial pump and valve bodies for abrasive slurries; offshore structural brackets and connectors; and architectural feature castings requiring high strength with golden-yellow appearance.
Pricing
US$ 11.50 per kilogram (CIF, indicative). MOQ: sample 1 pc; production 50 pcs.
Quality
EN 1982 CC770S; IS 318 HTB3; ISO 9001:2015; EN 10204 3.1 MTR; mechanical test certificates; carbide tooling required for machining operations. ISO 9001:2015. EN 10204 3.1 MTR.
Related Grades
- C85700 Yellow Brass Casting
- C46400 Naval Brass Casting
- C83600 LG2 Red Brass Casting
- Brass Castings – All Grades
Request a Quote
Price: US$ 11.50/kg. Email: info@elecaccs.com | www.elecaccs.com
