What is C28000 brass?
C280 sometimes referred to as Muntz Metal, nominally contains 60% copper, and 40% zinc. The importance of this alloy is its color, which is essentially that of architectural bronze. Alloy 280 metallographic structure is made of a large portion of beta grains, and so it is stronger, harder, and more rigid than brasses of lesser zinc content. C28000 work hardens rapidly, and so is less adapted to cold work. However, it may be bent or formed readily enough.
Chemical Properties
| Element | Cu | Pb | Zn | Fe |
| Min % | 59 | |||
| Max % | 63 | 0.09 | Rem | 0.07 |
Physical Properties
| Melting Point – Liquidus ⁰F | 1660 |
| Melting Point – Solidus ⁰F | 1650 |
| Density lb/cu in. at 68⁰F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity % IACS at 68⁰F | 28 |
| Thermal Conductivity Btu/sq ft/ft hr/ ⁰F at 68⁰F | 7 |
| Coefficient of Thermal Expansion 10-6 per ⁰F (68-572 ⁰F) | 11.6 |
| Specific Heat Capacity Btu/lb/⁰F @ 68 ⁰F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
Fabrication Properties
| TECHNIQUE | SUITABILTY | |
| Soldering | Excellent | |
| Brazing | Excellent | |
| Oxyacetylene Welding | Good | |
| Gas Shielded Arc Welding | Fair | |
| Coated Metal Arc Welding | Not Recommended | |
| Spot Weld | Good | |
| Seam Weld | Not Recommended | |
| Butt Weld | Good | |
| Capacity for Being Cold Formed | Fair | |
| Capacity for Being Hot Formed | Excellent | |
| Forgeability Rating | 90 | |
| Machinability Rating | 40 |
Mechanical Properties
| FORM | TEMPER | TENSILE STRENGTH | YS-0.5% EXT (KSI) | ELONGATION (%) | ROCKWELL (B) | ROCKWELL (F) | ROCKWELL (30T) | SHEAR STRENGTH (KSI) | SECTION SIZE (IN) |
| PLATE SHEET STRIP | H02 | 70 | 50 | 10 | 75 | 67 | 44 | 0.04 | |
| H00 | 60 | 35 | 30 | 55 | 54 | 42 | 0.04 | ||
| M20 | 54 | 21 | 45 | 85 | 49 | 40 | 0.04 | ||
| O60 | 54 | 21 | 45 | 80 | 46 | 40 | 0.04 |
How to Choose Between C28000 and C26000
Choose C28000 (Muntz Metal) When:
The Environment is Aggressive (Marine/Brackish Water): This is the most critical factor. If the part will be in seawater or other environments prone to dezincification, C28000's 60/40 composition is specifically formulated to resist this type of corrosion much better than C26000.
High Strength is Required: For structural components, load-bearing fasteners, or parts subject to wear, C28000 provides superior strength.
The Part Will Be Hot-Formed: If the manufacturing process involves hot forging, hot stamping, or extrusion, C28000's alpha-beta structure is ideal.
You Need Good Properties in As-Supplied (Hot-Rolled) Form: C28000 is often used directly in its hot-finished state without needing cold work for strength.
Choose C26000 (Cartridge Brass) When:
Severe Cold Forming is Required: This is the primary reason. If the part requires deep drawing, spinning, severe bending, or stamping at room temperature, C26000 is the clear choice. Its single-phase alpha structure provides unmatched ductility.
The Application is Classic "Brass" Functions: For ammunition casings (where it gets its name), electrical components, and plumbing fixtures (where water is not highly aggressive), C26000 is the standard.
Aesthetics and Finish are Important: Its richer golden color is often preferred for decorative applications. It also takes plating and polishing very well.
You Need a Combination of Good Corrosion Resistance and Good Formability: For general atmospheric exposure and many indoor applications, C26000 offers an excellent balance.
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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