The C28000 Muntz metal tube is made up of a copper zinc alloy containing 60% copper and 40% zinc. C28000 Muntz metal tubes are also known as CuZn40 and are used where hot-working strength and condenser-tube performance matter. It is a duplex brass forming an alpha-beta microstructure, and its use includes hot working and manufacturing industrial products. Seamless C28000 tubes may be provided based on ASTM B111 / ASME SB111 specifications for condenser tubing, depending upon grade and product specifications. The high percentage of zinc makes C28000 susceptible to dezincification under corrosive water conditions, and special care must be taken when it is used in marine environments. USA Pipings Solutions supplies Muntz metal tubes with dimensional inspection and EN 10204 3.1 Mill Test Certificates for material traceability.
Specifications of C28000 60/40 Muntz Metal Tubes
| Specification Parameter | ASTM B111 / ASME SB111 Technical Basis |
|---|---|
| UNS Alloy Designation | UNS C28000 |
| Common Trade Names | 60/40 Muntz Metal, CuZn40, EN CW509L, BS CZ109 |
| Governing Specifications | ASTM B111 / ASME SB111 (Seamless Condenser Tube & Ferrule Stock) |
| Manufacturing Form | Seamless Round Tube (Cold Drawn and Annealed) |
| Standard Delivery Temper | O61 (Annealed) |
| Outer Diameter (OD) Range | 1/8" to 3-1/8" (3.18 mm to 79.38 mm) per B111 scope |
| Wall Thickness Range | 0.020" to 0.200" (0.51 mm to 5.08 mm) |
| Tubing Lengths | Standard 10 ft, 20 ft, or precision cut-to-length heat exchanger lengths |
| Surface Condition | Clean annealed, scale-free, bright mill finish |
| End Finishing | Plain square cut, deburred, or pre-beveled for tube sheet expanding |
| Mandatory Tests (B111) | Tension test, Expansion test, Residual stress test (Mercurous Nitrate/Ammonia), NDT |
| Quality Certification | EN 10204 3.1 Certified; EN 10204 3.2 available via third-party inspection |
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Applications and Industrial Uses of C28000 60/40 Muntz Metal Tubes
- Condenser Tubes
- Heat Exchanger Tubes
- Condenser Tube Ferrules and Tube Plates
- Industrial Machined Components
- Architectural Hardware
- Fasteners and Fixings
- Pump and Valve Components
- General Engineering Components
Frequently Asked Questions
1. What is C28000 60/40 Muntz metal?
C28000 Muntz metal is a brass alloy containing approximately 60% copper and 40% zinc, known for its strength and hot-working properties.
2. What is the chemical composition of C28000 Muntz metal?
C28000 contains 59.0 to 63.0% copper with the balance zinc, plus limited iron and lead, per ASTM B111.
3. What are the properties and uses of C28000 brass tubes?
C28000 brass tubes offer good strength, hot-workability, and machinability. They are used in industrial components, condenser tubing, and general engineering applications.
4. Which ASTM standard covers C28000 Muntz metal tubes?
ASTM B111 / ASME SB111 covers seamless copper-alloy condenser tubes and ferrule stock, including C28000 where specified.
5. What is the difference between C28000 and C26000 brass?
C28000 contains approximately 60% copper and 40% zinc, while C26000 contains 70% copper and 30% zinc. C26000 generally offers better cold-formability, whereas C28000 provides good strength and hot-working characteristics.
6. Is C28000 Muntz metal suitable for seawater applications?
C28000 is generally not recommended for prolonged seawater exposure because its high zinc content makes it susceptible to dezincification. C44300 Admiralty Brass or C70600 Copper Nickel may be more suitable alternatives, depending on service conditions.
7. Is C28000 Muntz metal suitable for heat exchangers and condensers?
Yes, C28000 can be used for condenser and heat-exchanger tubing where the applicable specification and service conditions permit it. Water chemistry and dezincification risk should be evaluated before selection.
ASTM B111 / ASME SB111. EN 10204 3.1 Mill Test Certificates with heat-number traceability.
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