C84400 is the most widely used alloy in the semi-leaded red brass family, known for its reasonable cost with good machining and casting properties. The lead content ensures pressure tightness. Red brass is also used for low-cost bearing materials under low loads. This group of alloys is typically found in plumbing applications. See more applications below.
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(UNS C84400 | ASTM B584 | SAE J461 | RoHS 6c Compliant)
85% Cu, 5% Sn, 5% Zn, 5% Pb • Pressure-Tight Casting Specialist • Machinability + Corrosion Defense
Product Overview: The Foundry's Secret Weapon
When Sloan Valve casts 2 million flush valves or Mueller Industries produces fire-sprinkler fittings, they rely on C84400. This leaded semi-red brass flows like honey into intricate molds, shrugs off dezincification, and machines at 90% C36000 speed. It’s why NYC plumbing codes approve it for non-potable systems – delivering leak-proof reliability where lead-free alloys crack under pressure.
Technical Parameters
| Property | C84400 Value | C83600 (Ounce Metal) | C84400 Alternatives |
|---|---|---|---|
| Composition | Cu 81–85% | Cu 84–86%, Sn 5% | Cu 85%, Zn 5%, Pb 4–6% |
| Sn 4–6%, Zn 4–7% | Zn 5%, Pb 5% | ||
| Pb 4–6% | |||
| Tensile Strength | 275 MPa | 240 MPa | 290 MPa |
| Yield Strength (0.2%) | 125 MPa | 110 MPa | 140 MPa |
| Machinability Rating | 80% | 70% | 85% |
| Pressure Rating | 1.200 PSI | 900 PSI | 1.500 PSI |
| Dezincification Resist. | Class B (ISO 6509) | Class C | Class A |
| Thermal Conductivity | 70 W/m·K | 60 W/m·K | 75 W/m·K |
Certifications: ASTM B584. SAE J461. RoHS 6c (Exemption 6c), NSF 61 (Non-Potable), UL 393
3 Foundry Game-Changers
Seamless Thin-Wall Casting
Flows at 950°C into 1.5mm sections – 30% fewer rejects vs. bronze.
Machining Economics
80% machinability rating – cuts 25% faster than C83600. half the tool wear.
Corrosion Defense
Survives 500hr salt spray (ASTM B117) – zero dezincification in steam lines.
Engineering Superiority
Pressure Integrity: Seals at 1.200 PSI without microporosity (ASME B16.18 tested).
Biofilm Resistance: Tin content halts legionella growth in HVAC condensate.
Thermal Shock Resilience: Handles 0°C to 200°C cycling (ASHRAE 15 compliant).
Plating Adhesion: 0.4μm Ra as-cast finish for perfect nickel adhesion.
Precision Foundry Process
1 Alloy Blending
85% recycled copper + virgin Sn/Pb → XRF-verified melt.
2 Sand Casting
Green sand molds @ 950°C for complex geometries.
3 Deburring
Robotic tumbling with ceramic media.
4 Hot Isostatic Pressing
1.050°C/100MPa to eliminate porosity.
5 Leak Testing
100% helium mass-spec per ASTM E499.
Dominant Applications
| Industry | Key Components | Certification |
|---|---|---|
| Plumbing | Valve bodies, pump impellers | NSF 61 (Section 9), ASME A112 |
| HVAC | Condensate pans, compressor housings | ASHRAE 15. UL 1995 |
| Fire Protection | Sprinkler heads, junction boxes | UL 199. FM Global Approved |
| Marine | Deck fittings, bilge pump parts | ASTM B117. ABS Certified |
| Industrial | Steam traps, pressure gauges | ASME B16.18. EN 10226 |
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