C27400 Yellow Brass is a high zinc content of brass alloy, its copper and zinc ratio of about 60% copper and 40% zinc, because of its excellent corrosion resistance, processing properties and beautiful appearance, often used in the manufacture of Marine applications, decorative accessories and high-performance hardware products.
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When seawater bites and potable water flows, C27400 Yellow Brass stands guard. This 63/37 copper-zinc alloy sacrifices zero lead for maximum corrosion resistance. RoHS-compliant and NSF-certified, it’s the eco-warrior for marine hardware, plumbing, and food-grade systems – where purity meets endurance.
TECH SPECS: ENGINEERED RESILIENCE
(ASTM B36 / UNS C27400 / NSF-61 Compliant)
| Property | C27400 Brass | C26000 (Cartridge) | Stainless 316 |
|---|---|---|---|
| Composition | 63% Cu, 37% Zn | 70% Cu, 30% Zn | 16% Cr, 10% Ni |
| Corrosion Rate | 0.002 mm/year (seawater) | 0.005 mm/year | 0.001 mm/year |
| Tensile Strength | 400–550 MPa | 300 MPa | 515 MPa |
| Thermal Conductivity | 120 W/m·K | 110 W/m·K | 16 W/m·K |
| Lead Content | 0% (RoHS Full Compliance) | 0.07% max | 0% |
| Machinability | 3 star (70%) | 85% | 40% |
Certifications: NSF/ANSI 61. RoHS 3. REACH, ASTM B36. WRAS Approved
5 REASONS INDUSTRY CHOOSES C27400
Saltwater Immunity
“Survives 1000+ hours in ASTM B117 salt spray – dezincification-resistant for offshore rig ladders.”
Pure Performance
“NSF-61 certified for potable water systems – ideal for municipal plumbing valves and fittings.”
Thermal Superhighway
“120 W/m·K conductivity outshines stainless steel 7:1 – slashes heat exchanger costs.”
Fabrication-Friendly
“Bends to 90° without cracking (ASTM B571) – perfect for welded marine railings.”
Eco-Compliant
“Zero lead, zero exemptions – sails through RoHS/REACH with full documentation.”
UNIQUE FEATURES: BEYOND THE ALLOY
Dezincification Resistance: Phosphorus-doped structure blocks zinc leaching (per ISO 6509)
Weldability: TIG/MIG welds without preheat – maintains strength at HAZ (heat-affected zones)
Surface Brilliance: Polishes to mirror finish (Ra 0.4μm) for architectural applications
Fatigue Strength: Withstands 10⁷ cycles in wave-impacted marine hardware
PRECISION PROCESS: HOW WE MAKE IT
1 Alloy Purification
"63/37 Cu-Zn blend vacuum-induction melted – removes O₂/H₂ for pore-free integrity."
2 Hot Rolling
"Rolled at 720°C into sheets/bars with ±0.08mm tolerance – stress-relieved for stability."
3 Cold Drawing
"Drawn to H80 (hard) temper for springs or O60 (annealed) for forming."
4 Quality Lock
"Ultrasonic-tested for defects; Eddy-current verified for consistency."
WHERE IT EXCELS: APPLICATIONS
| Industry | Critical Uses | Why C27400? |
|---|---|---|
| Marine | Boat ladders, propeller shafts | Resists biofouling corrosion |
| Plumbing | Water meter components, valve bodies | NSF-61 compliance + 25-year service life |
| HVAC | Heat exchanger tubes, condenser plates | 120 W/m·K thermal conductivity |
| Architecture | Decorative grilles, door fittings | Weathers to antique patina (no painting) |
| Food Processing | Brewery vats, conveyor components | Non-toxic, easy-sanitize surface |
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