What is C28000 brass?
C28000 is a specific type of brass (copper-zinc alloy) in the American ASTM standard, often referred to as "Muntz Gold" or "60-40 Brass". This alloy has good strength, toughness, and corrosion resistance, as well as excellent electrical and thermal conductivity, and is therefore widely used in many fields such as industry, construction, automotive, and marine engineering.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 59.00 | 63.00 |
| Pb | – | 0.30 |
| Fe | – | 0.07 |
| Total Others | – | 0.30 |
| Zn | Remainder | |
Mechanical Properties According To ASTM B36 (As Per Temper HO2)
| Range (Inch) | From | To | UTS Min (ksi) | UTS Max (ksi) | PS Min | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) |
| Round (Dia) | 0.059 | 2.953 | 58 | 70 | – | – | 52 | 80 |
| Hex (A/F) | 0.118 | 2.756 | 58 | 70 | – | – | 52 | 80 |
| Square (A/F) | 0.118 | 2.362 | 58 | 70 | – | – | 52 | 80 |
| Range (mm) | From | To | UTS Min (MPa) | UTS Max (MPa) | PS Min | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) |
| Round (Dia) | 1.5 | 75 | 400 | 485 | – | – | 52 | 80 |
| Hex (A/F) | 3 | 70 | 400 | 485 | – | – | 52 | 80 |
| Square (A/F) | 3 | 60 | 400 | 485 | – | – | 52 | 80 |
Physical Properties
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1660 |
| Melting Point – Solidus°F | 1650 |
| Density lb/cu in. at 68°F | 0.303 |
| 8.39 | 8.39 |
| Electrical Conductivity % IACS at 68°F | 28 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
Fabrication Properties
| Technique | Suitability |
| 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 Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 90 |
| Machinability Rating | 40 |
C28000 (Muntz Metal) vs. C26000 (Cartridge Brass)
| Feature / Property | C28000 (Muntz Metal) | C26000 (Cartridge Brass) |
|---|---|---|
| Primary Composition | 60% Copper, 40% Zinc (CuZn40) | 70% Copper, 30% Zinc (CuZn30) |
| Material Family | Alpha-Beta Brass (Two-phase structure) | Alpha Brass (Single-phase structure) |
| Key Characteristic | Strength & Corrosion Resistance | Ductility & Cold Workability |
| Cold Workability | Poor. Prone to cracking; not suitable for severe bending or drawing at room temp. | Excellent. The standard for deep drawing, stamping, and bending. |
| Hot Workability | Excellent. Best forged, extruded, or hot-rolled. | Good. |
| Machinability | Fair (~30% of free-cutting brass). | Fair to Good (~30% of free-cutting brass). Slightly better than C28000 due to lower Zn. |
| Corrosion Resistance | Excellent, especially against dezincification in marine/water environments. | Very Good in most atmospheres. More susceptible to dezincification than C28000 in certain waters. |
| Strength | Higher. Higher tensile and yield strength, especially in hot-worked conditions. | Lower. Softer and more malleable. |
| Typical Forms | Sheet, plate, rod (hot-worked), forgings, structural shapes. | Sheet, strip, tube, wire, drawn shells. |
| Typical Applications | Marine hardware, architectural trim, heat exchanger shells, pump components, bolts. | Ammunition cases, electrical sockets, radiator cores, lamps, decorative trim, deep-drawn containers. |
| Color | Reddish-gold (lower copper content). | Rich, golden yellow (higher copper content). |
| Common Names | Muntz Metal, 60/40 Brass. | Cartridge Brass, 70/30 Brass, Spinning Brass. |
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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