Leaded Commercial Bronze C31400 combines the natural corrosion resistance of C22000 with the machinability typical of leaded brasses. Like C22000. it is an alpha brass nominally composed of 89% copper and 9% zinc, but it also contains approximately 2% lead to impart free-cutting characteristics.
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(UNS C31400 | ASTM B584 | SAE CA314 | ISO 427)
89% Cu · 1.5% Pb · Precision-Machined Reliability · Corrosion-Resistant Workhorse
Product Overview: The Machining Specialist
When Moen manufactures 3 million faucet cartridges or Parker Hannifin produces hydraulic fittings, they trust C31400 Leaded Commercial Bronze. This alloy delivers 90% machinability – 35% faster than standard bronze – while resisting dezincification in harsh environments. With optimized lead content (1.5-2.5%), it meets NSF 61 standards for potable water systems, slashing production costs for high-volume components.
Technical Parameters
| Property | C31400 Value | C36000 Brass | C93200 Bronze |
|---|---|---|---|
| Composition | Cu 87.0-90.0% | Cu 60-63% | Cu 81-85% |
| Pb 1.5-2.5% | Pb 2.5-3.7% | Sn 6-8% | |
| Zn 7.0-10.0% | Zn Balance | Pb 6-8% | |
| Machinability | 90% (Free-cutting) | 100% | 40% |
| Tensile Strength | 345 MPa | 340 MPa | 240 MPa |
| Corrosion Resistance | Class A- | Class C | Class B+ |
| Thermal Conductivity | 72 W/m·K | 120 W/m·K | 45 W/m·K |
| Pressure Rating | 1.200 psi | 1.000 psi | 800 psi |
Certifications: ASTM B584. NSF 61 (Potable Water), RoHS Exemption 6c, REACH Annex XVII
3 Key Advantages
Unbeatable Machining Efficiency
90% machinability reduces CNC cycle times 25% vs. silicon bronze (per ASME B94.55M), with superior chip-breaking.
Corrosion Defense
Passes 800hrs ASTM B117 salt spray without dezincification – ideal for marine/plumbing applications.
Cost Savings
30% lower material cost than nickel alloys while maintaining NSF 61 compliance for water systems.
Critical Engineering Features
Seal Integrity: Holds 1.200 psi hydraulic pressure (ASME B16.34 validated)
Thermal Stability: Reliable performance from -20°C to 180°C
Plating Adhesion: 4x better chrome/nickel bonding than lead-free alternatives
Vibration Damping: 20% higher than aluminum bronze for noisy environments
Precision Manufacturing Process
1 Induction Melting
90% recycled copper + precise Pb/Zn additives → 1.080°C controlled atmosphere.
2 Continuous Casting
Sand molds form 120mm billets for uniform lead distribution.
3 Hot Extrusion
700°C forming for complex profiles (valve bodies, flanges).
4 High-Speed Machining
Carbide tools @ 220 SFM with emulsified oil coolant.
5 Surface Finishing
Electropolishing or passivation per ASTM B733.
Core Applications
| Industry | Critical Components | Compliance Standards |
|---|---|---|
| Plumbing | Faucet cartridges, pump bodies | NSF 61. WRAS, ACS |
| Marine | Seawater valves, stern fittings | ASTM B171. MIL-B-17190 |
| Automotive | Fuel line connectors, bushings | SAE J461. IATF 16949 |
| HVAC | Compressor valves, refrigerant nuts | ASHRAE 15. UL 207 |
| Industrial | Hydraulic adapters, conveyor pins | ISO 9001. DIN 86017 |
Top Search Keywords:
C31400 bronze price | Leaded bronze plumbing fittings | Machinable bronze NSF 61 | ASTM B584 C31400
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