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CC768S Naval Brass Casting – CuZn38Sn1
CC768S Naval Brass Casting – CuZn38Sn1
CC768S (EN 1982 / CuZn38Sn1-C) is the European standard designation for Naval Brass casting, directly equivalent to US C46400. The tin addition (0.5–1.0%) inhibits dezincification in seawater and aggressive water service. CC768S provides tensile strength of 380 MPa – substantially higher than red brass or standard yellow brass – combined with good corrosion resistance in both seawater and fresh water. It is the preferred EN 1982 grade for marine deck hardware, through-hull fittings, sea cocks, and marine plumbing castings in European and global markets.
Alloy Overview
CC768S naval brass castings combine the strength of a higher-zinc alloy (Cu 59–62%, Zn ~38%) with tin-inhibited dezincification resistance. The tin addition stabilises the alpha phase at grain boundaries and retards zinc dissolution in seawater service, providing dezincification resistance superior to uninhibited yellow brass while being simpler and less expensive than fully DZR arsenic-inhibited grades. ISO 6509 dezincification test results for CC768S typically show plug depths of 100–180 µm (threshold 200 µm).
Material Composition
| Element | Min % | Max % | Typical % | Role |
|---|---|---|---|---|
| Copper (Cu) | 59.0 | 62.0 | 60.5 | Primary matrix, corrosion resistance |
| Zinc (Zn) | Balance | Balance | ~38.5 | Strength, castability |
| Tin (Sn) | 0.50 | 1.0 | 0.75 | Dezincification inhibitor |
| Lead (Pb) | – | 0.20 | 0.10 | Minor machining aid |
| Iron (Fe) | – | 0.10 | 0.05 | Impurity |
| Aluminium (Al) | – | 0.05 | – | Impurity |
| Nickel (Ni) | – | 0.20 | – | Minor |
| Manganese (Mn) | – | 0.10 | – | Impurity |
| Silicon (Si) | – | 0.05 | – | Impurity |
| Arsenic (As) | – | 0.05 | – | Optional DZR enhancer |
Mechanical Properties
| Property | Sand Cast | Die Cast | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 380 min | 420 min | ASTM B584/EN 1982 |
| Yield Strength (MPa) | 140 | 170 | ASTM E8 |
| Elongation (%) | 20% | 22% | ASTM E8 |
| Hardness (HB) | 80–110 | ASTM E10 | |
| Density (g/cm³) | 8.50 | – | |
| Electrical Conductivity (%IACS) | 22–25 | – | |
| Melting Range (°C) | 880–900 | – | |
| Machinability (%) | 40–50 | CDA scale | |
International Equivalent Grades
| Standard | Designation | Name |
|---|---|---|
| Europe (EN 1982) | CC768S | CuZn38Sn1-C – Naval Brass |
| USA (ASTM B584) | C46400 / CDA 464 | Naval Brass Casting |
| Germany (DIN 1709) | CuZn38Sn1-C | Sondermessing (Sn-inhibited) |
| UK (BS 1400) | HTB1 | High Tensile Brass Casting |
| India (IS 318) | HTB2 | High Tensile Brass Grade 2 |
| Japan (JIS H5111) | C4622 | Naval Brass Casting |
| ISO | CuZn38Sn1-C | Naval Brass Casting |
| China (GB/T 1176) | ZCuZn38Sn1 | 铸造海军黄铜 (Naval Brass) |
Applications
CC768S naval brass castings: marine through-hull fittings and sea cocks; boat deck hardware (cleats, fairleads, padeyes, chain plates); propeller shaft nuts and sterngear; seawater pump casings and strainer bodies; marine heat exchanger water box covers; subsea fittings for shallow water service; offshore electrical conduit bodies in saltwater environments; and marine valve bodies for seawater cooling and ballast systems.
Pricing
US$ 11.50 per kilogram (CIF, indicative). MOQ: sample 1 pc; production 50 pcs.
Quality
EN 1982 CC768S; ASTM B584 C46400; IS 318 HTB2; ISO 6509 dezincification test (≤200 µm); ISO 9001:2015; EN 10204 3.1 MTR; hydrostatic pressure test on valve and fitting castings. 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