CuZn37 brass tubes are made from a 63/37 copper-zinc alloy, listed in the European standard as CW508L and the older British standard as CZ108. These tubes are a good balance of strength, ductility, and workability and contain 62 to 64% copper and no more than 0.1% lead. Because of their superior cold forming qualities, they can be bent, flared, expanded, and formed into various profiles. They also offer excellent surface finishing qualities, which include polishing, soldering, brazing, and electroplating of the required components. CuZn37 is used in a wide variety of electrical fitting products, plumbing components, furniture and architectural products, due to its moderate machinability and good corrosion resistance. Amardeep Steel supplies CuZn37 round, square and rectangular tube with EN 10204 certificates.
Technical Data
Specifications of CuZn37 Brass Tubes
| Parameter | Specification |
|---|---|
|
Material |
CuZn37, EN CW508L (63/37 brass, BS CZ108) |
|
Standards |
EN 12449 seamless round tube; square and rectangular tube to drawing |
|
Types |
Seamless round, welded round, square, rectangular |
|
Round Tube OD |
3 mm to 100 mm |
|
Square / Rectangular |
10 x 10 mm to 50 x 50 mm; rectangular to drawing |
|
Wall Thickness |
0.5 mm to 5 mm |
|
Length |
Up to 5 or 6 m, or cut to length |
|
Temper |
Soft (annealed), half hard, hard |
|
Documents |
EN 10204 3.1 stating CW508L and actual lead content; 3.2 on request |
Chemical Compositions of CuZn37 Brass Tubes
| Element | CuZn37, CW508L, EN (%) |
|---|---|
|
Copper (Cu) |
62.0 to 64.0 |
|
Lead (Pb), max |
0.1 |
|
Iron (Fe), max |
0.1 |
|
Nickel (Ni), max |
0.3 |
|
Tin (Sn), max |
0.1 |
|
Aluminium (Al), max |
0.05 |
|
Others, each max |
0.1 |
|
Zinc (Zn) |
Remainder |
CuZn37 Brass Tubes Mechanical Properties
| Temper | Tensile Rm (MPa) | 0.2% Proof, min (MPa) | Elongation A50, min (%) |
|---|---|---|---|
|
R350 (soft) |
350 to 440 |
170 |
19 |
|
R410 (half hard) |
410 to 490 |
300 |
8 |
|
R480 (hard) |
480 to 560 |
430 |
3 |
|
R550 (spring hard) |
550 min |
500 |
Not specified |
Physical Properties of CuZn37 Brass Tubes
| Property | Value |
|---|---|
|
Density |
8.44 g/cm³ |
|
Melting Point (min) |
916°C |
|
Thermal Conductivity |
120 W/m·K |
|
Electrical Conductivity |
26% IACS |
|
Thermal Expansion (20 to 300°C) |
20.4 x 10⁻⁶ /K |
|
Modulus of Elasticity |
110 GPa |
|
Annealing |
450 to 650°C |
|
Cold Forming / Hot Forming |
Excellent / Good |
|
Machinability |
About 35 (CuZn39Pb3 = 100) |
|
Soldering / Brazing |
Excellent |
|
Gas Shielded Arc Welding |
Good; oxy-acetylene not recommended |
|
Polishing, Plating, Hot Dipping |
Excellent |
Equivalent Grade of CuZn37 Brass Tubes
| Standard | Designation |
|---|---|
|
EN |
CuZn37, CW508L |
|
BS (former) |
CZ108 |
|
DIN (former) |
CuZn37, 2.0321, MS 63 |
|
UNS |
C27200 (nearest); C27400 |
|
JIS |
C2720 |
|
ISO |
CuZn37 |
|
SIS |
SS 5150 |
Size and Weight Chart of CuZn37 Brass Tubes
| Size (mm) | Shape | Approx. Weight (kg/m) |
|---|---|---|
|
10 x 1 |
Round |
0.24 |
|
20 x 1.5 |
Round |
0.74 |
|
25 x 2 |
Round |
1.22 |
|
50 x 2 |
Round |
2.55 |
|
20 x 20 x 1.5 |
Square |
0.94 |
|
25 x 25 x 2 |
Square |
1.55 |
Applications and Industrial Uses of CuZn37 Brass Tubes
- Electrical Connectors
- Plumbing Fittings
- Decorative Lighting Fixtures
- Furniture Tubing
- Architectural Trims
- Automotive Fittings
- Musical Instrument Components
- Brass Handrails
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 their excellent ductility and cold-forming properties.
2. What is the EN number for CuZn37?
The EN material designation for CuZn37 is CW508L.
3. Is CuZn37 the same as CZ108?
Yes. CZ108 is the former British designation for CuZn37, now identified as CW508L.
4. Is CuZn37 lead free?
CuZn37 is a low-lead brass containing a maximum of 0.1% lead. Check local approvals before using it in drinking water applications.
5. What is the difference between CuZn37 and CuZn30?
CuZn30 contains more copper, making it better for severe drawing operations. CuZn37 is more economical and still offers very good formability.
6. What is the density of CuZn37?
CuZn37 brass has a density of approximately 8.44 g/cm³.
7. Is CuZn37 available as square tube?
Yes. CuZn37 is available in round, square, and rectangular tube sections, manufactured to specified dimensions.
8. Can CuZn37 tube be bent and soldered?
Yes. CuZn37 offers excellent cold formability and is suitable for soldering and brazing operations.
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