C28000 Brass Tube Specification
1. Material Designation
UNS Number: C28000
Common Name: Muntz Metal (60/40 Brass)
Description: A high-strength alpha-beta brass with approximately 60% copper and 40% zinc. It offers excellent corrosion resistance in marine and industrial atmospheres and good hot workability.
2. Applicable Standards
ASTM B171: Standard Specification for Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers, and Heat Exchangers.
ASTM B543: Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube.
ASTM B587: Standard Specification for Welded Brass Tube.
ASME SB-171 / SB-543 / SB-587: Equivalent specifications for pressure vessel and boiler applications.
3. Chemical Composition (Weight % - ASTM Typical)
| Element | Min (%) | Max (%) |
|---|---|---|
| Copper (Cu) | 59.0 | 63.0 |
| Zinc (Zn) | Remainder | |
| Lead (Pb) | - | 0.30 |
| Iron (Fe) | - | 0.07 |
| Other Impurities (Total) | - | 0.15 |
4. Mechanical & Physical Properties (Typical for Annealed Temper)
Tensile Strength: 54 - 62 ksi (370 - 425 MPa)
Yield Strength (0.5% Ext under load): 22 - 25 ksi (150 - 170 MPa)
Elongation (in 2" / 50mm): 40% - 50%
Rockwell Hardness (B Scale): ~ 50 HRB
Density: 0.303 lb/in³ (8.39 g/cm³)
Melting Point (Liquidus): ~ 1652°F (900°C)
Thermal Conductivity: ~ 71 BTU·in/(hr·ft²·°F) [~ 122 W/(m·K)]
Coefficient of Thermal Expansion (68-572°F): 11.6 x 10⁻⁶ /°F (20.9 x 10⁻⁶ /K)
Available Tempers & Conditions
Tubes are commonly supplied in:
Annealed (O61 / O50): Soft, for severe bending and forming.
Drawn (H58): Half-hard, for general purpose with good strength.
As-Fabricated (M20): For tubes formed by welding and drawing.
Common Tube Forms & Sizes
Types: Seamless, Welded & Drawn.
Shapes: Round, Square, Rectangular.
Diameter Range (Round Tube): Typically from 1/8" (3.2 mm) OD up to several inches.
Wall Thickness: Available in various gauges, commonly specified per BWG (Birmingham Wire Gauge) or decimal inches/mm.
Length: Standard straight lengths (e.g., 12 ft / 3.66 m), or cut-to-length.
Key Characteristics & Advantages
Excellent Corrosion Resistance: Superior to many brasses, especially in marine/saline environments.
High Strength: Good tensile and yield strength, especially in worked tempers.
Good Hot Workability: Suitable for hot forming and bending processes.
Machinability: Fair (~30% of Free-Cutting Brass C36000).
Biofouling Resistance: Historically used for ship sheathing due to resistance to marine organism attachment.
Primary Applications
Heat Exchanger & Condenser Tubes (especially in marine, power, and chemical plants).
Marine Hardware & Fittings.
Architectural & Decorative Applications.
Industrial Piping for corrosive fluids.
Brazed & Soldered Assemblies.
Our factory
We operate a modern, specialized copper production facility equipped with advanced continuous casting and rolling lines, precision CNC machining equipment, and a rigorous quality inspection system, focusing on the manufacturing of copper tubes, plates, rods, wires, and strips. The factory is ISO9001 certified and possesses a complete industry chain capability-from raw material smelting and precision processing to finished product sorting. With an annual production capacity of tens of thousands of tons, we can flexibly handle customized orders, ensuring that our products meet international standards in dimensional accuracy, mechanical properties, and surface finish.
Copper product packaging
We implement customized packaging solutions based on product characteristics: copper tubes and rods are wrapped with moisture-resistant kraft paper, reinforced with bundling, and secured on wooden pallets or iron frame boxes to prevent deformation and damage during transit. Copper plates and strips are covered with protective film, separated by foam padding between layers, and externally secured with steel strapping along with waterproof packaging. Wires are coiled on industrial reels or vacuum-packed with plastic film. All packaging includes clear labels indicating product specifications, batch numbers, and protective symbols, ensuring safe delivery during long-distance sea and land transportation.
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