What is C28000 brass?
C28000 Brass is a common brass alloy, corresponding to the H62 brass type, and complies with the Chinese national standard GB/T 4423-1992. Products include specifications such as rods, plates, strips, wires, and tubes, which are used in fields including precision hardware, electronic equipment, and mold manufacturing.
Its chemical composition consists of copper (60.5%–63.5%), zinc (balance), and impurities including lead (≤0.08%), iron (≤0.15%), with a total impurity content ≤0.5%. The material exhibits good plasticity in the hot state, acceptable plasticity in the cold state, excellent machinability, ease of brazing and welding, and corrosion resistance, though it is prone to stress corrosion cracking. Mechanical properties show a tensile strength of ≥335 MPa, elongation δ10 ≥20%, and δ5 ≥24%. Hot working temperature ranges from 650–850°C, annealing temperature from 600–700°C, and stress-relief annealing temperature from 270–300°C to eliminate internal stress. It is commonly used in the manufacture of components subject to relatively high loads, such as pins, rivets, washers, nuts, and radiator parts.
Characteristics and Application Scope
Characteristics and Application Scope: It possesses good mechanical properties, good plasticity in the hot state, acceptable plasticity in the cold state, good machinability, ease of brazing and welding, and corrosion resistance, but it is prone to stress corrosion cracking. Furthermore, it is inexpensive and is a widely used common brass variety.
Chemical Composition of C28000 Brass:
Copper (Cu): 60.5–63.5
Zinc (Zn): Balance
Lead (Pb): ≤0.08
Phosphorus (P): ≤0.01
Iron (Fe): ≤0.15
Antimony (Sb): ≤0.005
Bismuth (Bi): ≤0.002
Note: Total impurities ≤0.5
Mechanical Properties
Tensile Strength, σb (MPa): ≥335
Elongation, δ10 (%): ≥20
Elongation, δ5 (%): ≥24
Heat Treatment Specification
Heat Treatment Specification: Hot working temperature 650–850°C; Annealing temperature 600–700°C; Stress-relief (low-temperature) annealing temperature 270–300°C.
C28000 (Muntz Metal) Equivalent Grades
| Standard System | Designation | Notes / Composition |
|---|---|---|
| UNS (USA) | C28000 | The base designation. Nominal 60% Cu, 40% Zn. |
| Common Name | Muntz Metal, 60/40 Brass | - |
| ISO | CuZn40 | Indicates ~40% Zn content. |
| EN (Europe) | CW508N | Formerly known as CuZn40. |
| JIS (Japan) | C2800 | The direct Japanese equivalent. |
| DIN (Germany) | 2.0360 | Material number for CuZn40. |
| BS (UK) | CZ108 | - |
| ASTM | B111, B171, etc. | Material is specified under these specifications. |
C28000 (Muntz Metal) vs. C36000 (Free-Cutting Brass)
| Feature / Property | C28000 (Muntz Metal) | C36000 (Free-Cutting Brass) |
|---|---|---|
| Primary Composition | 60% Copper, 40% Zinc (CuZn40) | 61.5% Copper, 35.5% Zinc, 3% Lead (CuZn36Pb3) |
| Material Family | Alpha-Beta Brass (Two-phase structure) | Lead-bearing Alpha-Beta Brass |
| Key Characteristic | Corrosion Resistance & Strength | Extreme Machinability |
| Machinability Rating | Fair to Good (~30% of C36000) | Excellent (100% baseline) The industry standard for free-machining. |
| Cold Workability | Poor (Prone to cracking) | Good (Lead improves chip-breaking) |
| Hot Workability | Excellent (Best forged or hot-rolled) | Good |
| Corrosion Resistance | Excellent, especially in marine environments. | Good, but lead content can leach, unsuitable for potable water. |
| Typical Forms | Sheet, strip, plate, rod (hot-worked), forgings. | Round, hex, square bar stock (for machining), screws, fittings. |
| Common Applications | Marine hardware (propellers, bolts), architectural trim, heat exchanger shells, pump parts. | Precision turned parts (gears, valves, fittings, connectors, screws), high-volume CNC components. |
| Cost Consideration | Generally lower base material cost (no lead). | Higher material cost, but significantly lower machining cost per part. |
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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