CuZn30 brass tubes are copper-zinc alloy tubes with a copper content of about 70% and a zinc content of about 30%, which are highly ductile and have high cold-forming ability. This is an alpha brass and can be used in the most severe fabrication processes, including deep drawing, flaring, bending and tube expansion. CuZn30 is frequently ordered to EN 12449 for seamless tubes for general engineering, and ASTM B135 is for seamless brass tubes to North American specifications. It is moderately machinable, making it suitable for any application that requires forming more than high-speed machining. CuZn30, however, can be prone to dezincification under aggressive water conditions, and careful selection of materials in fluid handling service is necessary. USA Pipings Solution supplies CuZn30 brass tubes with full heat traceability and an EN 10204 3.1 Mill Test Certificate with every shipment.
Specifications of Cuzn30 Brass Tubes
| Specification Parameter | European (EN 12449) & American (ASTM B135) Basis |
|---|---|
| EN Designation | CuZn30 |
| EN Numerical Code | EN CW505L |
| US UNS Equivalence | UNS C26000 (70/30 Cartridge Brass) |
| Governing Specifications | EN 12449 (Seamless Round Tubes); ASTM B135 / ASME SB135 |
| Product Form | Cold Drawn Seamless Round Tube |
| EN Material Tempers | R290 (Annealed), R350 (Half Hard), R420 (Hard) |
| ASTM Tempers Equivalent | O60 (Soft Anneal), O50 (Light Anneal), H55 (Light Drawn), H58 (Drawn) |
| Outer Diameter (OD) Range | 3.0 mm to 108.0 mm (0.118" to 4.25") |
| Wall Thickness Range | 0.5 mm to 10.0 mm (0.020" to 0.393") |
| Tube Lengths | Standard 3 meter / 6 meter straight lengths; cut-to-length sleeves |
| Surface Finish | Bright annealed, clean smooth drawn, mechanically polished |
| Mandatory Tests | Tensile test, Hardness test, Expansion/Drift test, Eddy Current NDT |
| Certification | EN 10204 3.1 MTC provided with all shipments; 3.2 inspection on request |
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Applications and Industrial Uses of Cuzn30 Brass Tubes
- Heat Exchanger Components
- Electrical Connector Components
- Automotive Tubular Components
- Plumbing Fittings
- Deep-Drawn Industrial Parts
- Instrumentation Components
- Furniture and Architectural Hardware
- General Engineering Components
Frequently Asked Questions
1. What is CuZn30 brass?
CuZn30 is a yellow brass alloy containing approximately 70% copper and 30% zinc. It offers excellent ductility and cold-forming properties.
2. Is CuZn30 the same as C26000 and CW505L?
CuZn30 and C26000 refer to similar 70/30 brass compositions. CW505L is the European designation for CuZn30. CuZn30 (EN) and C26000 (UNS) are close but not identical: the copper window is 69.0 to 71.0% in EN and 68.5 to 71.5% in ASTM B135.
3. Which standard covers CuZn30 tube?
EN 12449 covers copper and copper-alloy seamless tubes for general purposes. ASTM B135 covers seamless brass tubes in North American specifications.
4. What is the difference between CuZn30 and CuZn37?
CuZn30 contains approximately 70% copper and 30% zinc, offering better cold-formability. CuZn37 contains approximately 63% copper and 37% zinc, generally offering lower material cost.
5. Is CuZn30 lead free?
CuZn30 typically has a low lead content, subject to the applicable standard. Drinking-water approval requires verification of the finished product's relevant certification.
6. Is CuZn30 suitable for seawater?
No. Standard CuZn30 is susceptible to dezincification in seawater. C44300 Admiralty Brass or C70600 Copper Nickel may be more suitable, depending on service conditions.
7. Can CuZn30 be machined easily?
CuZn30 has moderate machinability and tends to produce long, stringy chips because it lacks deliberate lead additions.
EN 12449 and ASTM B135. EN 10204 3.1 Mill Test Certificates with full heat traceability.
Send your specification to USA Piping Solution for a same-day quote with confirmed lead times.
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