| Customization: | Available |
|---|---|
| Type: | Rolling Wire |
| Material: | CO2 |
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RBCuZn-D Brass Welding/Brazing Filler Metal: Technical Summary
AWS A5.8 Designation: RBCuZn-D (formerly known as "Naval Brass")
Material Type: Copper-Zinc alloy (Cu-Zn-Sn system) with added tin for heightened corrosion resistance.
Key Use: Ideal for joining copper alloys, steel, and cast iron in environments where superior seawater and chemical corrosion resistance is crucial.
Table 1: Composition (Weight %)
| Cu | Zn | Sn | Fe | Pb | Si | Impurities |
|---|---|---|---|---|---|---|
| 58.0-61.0% | Rem. | 0.5-1.5% | 0.25-1.0% | ≤0.10% | 0.04-0.25% | ≤0.50% total |
Key Elements:
Sn (Tin): Boosts resistance to seawater dezincification.
Fe (Iron): Adds strength and enhances wear resistance.
Low Pb/Si: Reduces risk of hot cracking during welding.
As-Deposited:
Tensile Strength: Ranging from 410-510 MPa
Hardness: Measured at 85-105 HB
Melting Range: Between 885-900°C (solidus-liquidus)
Corrosion Resistance: Outstanding in seawater, marine atmospheres, and mild acids/alkalis.
Marine Engineering: Perfect for ship propellers, seawater piping, and condenser tubes.
Industrial: Excellent for heat exchangers, pump components, and valve bodies.
Repair: Effective for joining/building up manganese bronzes and high-tensile brasses.
Process Compatibility:
Oxy-Acetylene Welding (OAW): Most suitable for cast iron repairs.
Gas Tungsten Arc Welding (GTAW/TIG): Ideal for precision joints (use DCEN polarity).
Parameters:
Flux Requirement: Use AWS Type FB3-A or borax-based flux (mandatory to prevent oxidation).
Preheat: Maintain at 150-260°C (for thick sections/cast iron).
Interpass Temp.: Keep ≤200°C to avoid Zn fuming.
Zinc Fume Hazard: Ensure a safe and healthy working environment by utilizing local exhaust ventilation (LEV) and equipping yourself with OSHA-approved respirators for protection.
Storage: To preserve quality and prevent oxidation, store in sealed containers with humidity levels kept below 40%.
Form Availability: Available in versatile forms: rods ranging from 3-6 mm in diameter and convenient coils to suit diverse requirements.
| Filler | Composition | Key Use Case |
|---|---|---|
| RBCuZn-D | Cu-Zn-Sn-Fe | Marine corrosion resistance |
| RBCuZn-C | Cu-Zn-Si (no Sn/Fe) | General-purpose brazing |
| ERCuSn-A | Cu-Sn (phosphor bronze) | Bronze welding, bearings |
Critical Note:
RBCuZn-D is not interchangeable with other materials such as silicon bronzes (e.g., ERCuSi-A) or nickel alloys. Specifically engineered for exclusive use with Cu-Zn base metals or for crafting dissimilar joints with a need for exceptional seawater resistance.
For full specifications, refer to AWS A5.8:2021 (Specification for Brazing Filler Metals).
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