What is C28000 brass?
C28000 is a specific type of brass (copper‑zinc alloy) under the American ASTM standards, commonly known as "Muntz Metal" or "60‑40 brass." This alloy offers good strength, toughness, and corrosion resistance, along with excellent electrical and thermal conductivity. As a result, it is widely used across various fields such as industry, construction, automotive, and marine engineering.
Composition and Characteristics of C28000 Copper Alloy
The main components of C28000 copper alloy include copper (Cu) and zinc (Zn), with copper content around 60% and zinc content around 40%. Additionally, it may contain trace elements such as iron (Fe) and lead (Pb). The specific proportions of these components determine the mechanical properties, corrosion resistance, and workability of the C28000 alloy. The following are the detailed chemical composition and mechanical performance parameters of C28000 copper alloy:
1. Chemical Composition (ASTM B171 Standard)
C28000 is a 60/40 brass (alpha-beta brass) with the following typical composition range:
Copper (Cu): 59.0 - 63.0%
Zinc (Zn): Remainder (approx. 37-41%)
Lead (Pb): ≤ 0.30% (Added for machinability)
Iron (Fe): ≤ 0.07%
Other Elements (Total): ≤ 0.15%
Note: The high zinc content places it in the alpha-beta brass category, giving it good hot workability but limited cold workability compared to alpha brasses (like C26000).
2. Mechanical Performance Parameters (Typical Values)
Properties vary with temper (condition). Common tempers: O60 (Annealed), H00 (¹⁄₄ hard), H01 (¹⁄₂ hard), H02 (Hard), H03 (Extra Hard), H04 (Spring).
| Property | Annealed (O60) | Hard / Cold Worked (H02 - H04) |
|---|---|---|
| Tensile Strength | 380 - 450 MPa (55 - 65 ksi) | 520 - 620 MPa (75 - 90 ksi) |
| Yield Strength (0.5% ext.) | 140 - 180 MPa (20 - 26 ksi) | 450 - 550 MPa (65 - 80 ksi) |
| Elongation (in 2 in / 50 mm) | 40 - 50% | 5 - 15% |
| Shear Strength | ~260 MPa (38 ksi) | ~340 MPa (49 ksi) |
| Fatigue Strength | ~130 MPa (19 ksi) | ~180 MPa (26 ksi) |
| Hardness (Rockwell) | B50 - B65 | B80 - B95 (or Rockwell F 75-85) |
| Modulus of Elasticity | ~110 GPa (16 x 10⁶ psi) | |
| Poisson's Ratio | ~0.33 |
Advantages:
Good Mechanical Properties: C28000 copper alloy exhibits high tensile strength and yield strength, enabling it to withstand significant external forces and pressure. This makes it widely used in mechanical parts and structural components.
Excellent Corrosion Resistance: Due to its high copper content, the C28000 alloy demonstrates good corrosion resistance in atmospheric environments, freshwater, and seawater, making it suitable for applications in ships, marine engineering, and chemical equipment.
Good Workability: The alloy offers excellent hot and cold workability, is easy to machine and weld, and can be used to manufacture complex parts and structures.
Good Electrical and Thermal Conductivity: The C28000 alloy has high electrical and thermal conductivity, giving it advantages in electrical equipment and heat exchanger applications.
Development Prospects of C28000 Copper Alloy
Automotive Industry: With the trend toward automotive lightweighting, C28000 copper alloy is expected to see widespread use in electric vehicle electrical systems, radiators, oil coolers, and other components due to its good strength, corrosion resistance, and electrical conductivity. Its high thermal conductivity helps improve heat dissipation efficiency, while its excellent corrosion resistance extends the service life of components.
Construction and Decorative Materials: The attractive appearance, corrosion resistance, and good workability of C28000 copper alloy make it an ideal material in the construction and decorative fields, particularly for high‑end applications such as door and window frames, handrails, guardrails, and decorative panels. As demand for green building and sustainable materials grows, the use of this alloy is expected to continue rising.
Marine Engineering and Shipbuilding: Thanks to its outstanding corrosion resistance in seawater environments, C28000 copper alloy is already widely used in marine engineering and shipbuilding for components such as propellers, bearings, pumps, valves, and seawater coolers. In the future, with increasing global marine development activities, demand for C28000 copper alloy is projected to grow further.
New Energy Sector: The excellent electrical and thermal conductivity of C28000 copper alloy gives it significant potential for applications in solar energy, wind energy, and power transmission. In solar power generation, the alloy can be used for collectors and transmission pipelines; in wind power generation, it can be employed for electrical connections and heat dissipation components.
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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