CuZn30 brass tubes come in the 70/30 copper zinc alloy (CW505L, UNS C26000), and the copper percentage in the tubes ranges from 69% to 71%. The single phase α structure provides them with excellent ductility, permitting significant amounts of cold working, without cracking. Easy to draw, expand, bend and flare these tubes with dimensional accuracy. Lead is restricted to 0.05% for most specifications of CuZn30, making it one of the cleanest brasses you can request, and at 70% CuZn30, it is a very formable brass that is used in instrument tubing, radiator cores, ammunition and decorative applications. The tubes are offered in seamless and welded type. Amardeep Steel is a reliable manufacturer, supplier of CuZn30 Brass tubes in India with material test certificate.
Technical Data
Specifications of CuZn30 Brass Tubes
| Parameter | Specification |
|---|---|
|
Material |
CuZn30, EN CW505L (70/30 cartridge brass) |
|
Standards |
EN 12449 seamless round tube; ASTM B135 / ASME SB135 seamless; ASTM B587 welded |
|
Types |
Seamless (drawn), welded, capillary and instrument tube |
|
Outside Diameter |
3 mm to 100 mm |
|
Wall Thickness |
0.3 mm to 5 mm |
|
Length |
Up to 6 m, coils for small OD, or cut to length |
|
Temper |
Annealed (R290 / OS050), half hard, hard (R370 / H80 class) |
|
Tests |
Chemical analysis, tensile, hardness, expansion, flattening, eddy current on request |
|
Documents |
EN 10204 3.1 stating CW505L and actual lead content; 3.2 on request |
Chemical Compositions of CuZn30 Brass Tubes
| Element | CuZn30, CW505L, EN (%) | C26000, CDA (%) |
|---|---|---|
|
Copper (Cu) |
69.0 to 71.0 |
68.5 to 71.5 |
|
Lead (Pb), max |
0.05 |
0.07 |
|
Iron (Fe), max |
0.05 |
0.05 |
|
Nickel (Ni), max |
0.3 |
Not specified |
|
Tin (Sn), max |
0.1 |
Not specified |
|
Aluminium (Al), max |
0.02 |
Not specified |
|
Other impurities, max |
0.1 |
Not specified |
|
Zinc (Zn) |
Remainder |
Remainder |
Mechanical Properties of CuZn30 Brass Tube
| Temper | Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|---|
|
OS050 |
Annealed, 0.050 mm grain |
324 |
103 |
65 |
|
OS025 |
Annealed, 0.025 mm grain |
359 |
138 |
55 |
|
H80 |
Hard drawn (35% cold work) |
538 |
441 |
8 |
Physical Properties of CuZn30 Brass Tubes
| Property | Value |
|---|---|
|
Density |
8.53 to 8.55 g/cm³ |
|
Melting Range |
916 to 954°C (CDA); 910 to 965°C (Matthey) |
|
Thermal Conductivity |
120 to 121 W/m·K |
|
Electrical Conductivity |
28% IACS |
|
Thermal Expansion |
About 20 x 10⁻⁶ /K (20 to 300°C) |
|
Modulus of Elasticity |
About 110 GPa |
|
Cold Working |
Excellent (best of the common brasses) |
|
Hot Forming |
Fair |
|
Machinability |
About 30 (free cutting brass = 100) |
|
Annealing |
450 to 680°C |
|
Soldering / Brazing |
Excellent |
|
Gas Shielded Arc / Oxy Acetylene Welding |
Fair to good |
Equivalent Grades of CuZn30 Brass Tubes
| Standard | Designation |
|---|---|
|
EN |
CuZn30, CW505L |
|
UNS / ASTM |
C26000 (cartridge brass, CDA 260) |
|
BS (former) |
CZ106 |
|
DIN (former) |
CuZn30, 2.0265 |
|
JIS |
C2600 |
|
ISO |
CuZn30 |
|
IS |
IS 407 brass tube |
Applications and Industrial Uses of CuZn30 Brass Tubes
- Automotive Industry
- Heat Exchanger Industry
- Refrigeration and HVAC Industry
- Ammunition Manufacturing Industry
- Instrumentation Industry
- Electrical Industry
- Construction and Architectural Industry
- Industrial Equipment Manufacturing Industry
Frequently Asked Questions
1. What are CuZn30 brass tubes?
CuZn30 brass tubes are copper zinc alloy tubes containing approximately 70% copper and 30% zinc, known for excellent ductility and cold working properties.
2. What is the difference between CuZn30, CW505L, and C26000?
All three refer to the same 70/30 cartridge brass alloy. CuZn30 is the alloy designation, CW505L is the European material designation, and C26000 is the UNS designation.
3. What is the ASTM equivalent of CuZn30?
The ASTM equivalent is UNS C26000 cartridge brass. Seamless tubes are covered by ASTM B135, while welded tubes are covered by ASTM B587.
4. Are CuZn30 brass tubes corrosion resistant?
Yes, CuZn30 brass tubes provide good corrosion resistance in normal atmospheric conditions and many water environments. Their suitability depends on the operating conditions.
5. Is CuZn30 brass lead free?
CuZn30 is classified as a low lead brass, with a maximum lead content of 0.05% under EN specifications. It is not completely lead free.
6. Can CuZn30 brass tubes be bent, flared, and expanded?
Yes, CuZn30 brass tubes have excellent ductility, making them suitable for bending, flaring, expanding, and drawing operations.
7. Is CuZn30 suitable for seawater?
No, CuZn30 is not recommended for seawater condenser applications. Admiralty brass or aluminium brass offers better resistance to dezincification in seawater environments.
8. What is the density of CuZn30?
CuZn30 brass has a density of approximately 8.53 g/cm³ (0.308 lb/in³).
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