ASTM B111 C28000 Tube – UNS C28000 (Muntz Metal Tube)
ASTM B111 C28000 Tube, designated as UNS C28000, is commonly known as Muntz Metal, a high-strength copper-zinc alloy containing approximately 60% copper and 40% zinc. ASTM B111 UNS C28000 tubes are manufactured in seamless form and are valued for their good mechanical strength, reasonable corrosion resistance, and cost-effectiveness. While not recommended for severe seawater environments, these tubes perform well in fresh water, industrial cooling systems, and general heat exchanger applications where strength and economy are key considerations.
Key Features
- Good corrosion resistance in fresh and mildly corrosive water
- Cost-effective material for heat exchanger tubing
- Seamless construction ensures dimensional accuracy
- Good machinability and fabrication characteristics
- Suitable for moderate temperature and pressure applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | C28000 |
| EN | CuZn40 |
| DIN | 2.0371 |
| ISO | CuZn40 |
Sizes
- Outside Diameter: 6 mm to 114.3 mm
- Wall Thickness: 0.7 mm to 6 mm
- Length: Up to 6 meters, random or cut lengths available
- Form: Straight lengths and U-bend tubes
ASTM B111 C28000 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | 59.0 – 61.0 |
| Zinc (Zn) | Balance |
| Lead (Pb) | Max 0.07 |
| Iron (Fe) | Max 0.05 |
| Tin (Sn) | Max 0.05 |
C28000 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 400 MPa |
| Yield Strength | ≥ 150 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 100 HRB |
UNS C28000 Physical Properties
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Point | ~900°C |
| Thermal Conductivity | ~120 W/m·K |
| Electrical Conductivity | ~28% IACS |
Type of C28000 Tubes
- C28000 Seamless Tubes
- C28000 U-Bend Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Heat Exchangers
- Condensers
- Power Plants
- HVAC systems
- Industrial cooling water circuits
- Oil refineries
- General engineering applications
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