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C26000
C26000
UNS C26000 (standardized under ASTM B36 / B36M for plate, sheet, strip, and rolled bar, ASTM B134 for wire, and ASTM B587 for welded pipe; historically known as Cartridge Brass, 70% or CuZn30) is the benchmark single-phase (α) wrought brass. Formulated with 68.5% to 71.5% copper and a zinc balance, C26000 provides an optimal combination of cold-working ductility, tensile strength, and corrosion resistance. Because its chemical composition sits comfortably within the single-phase alpha region of the copper-zinc phase diagram, C26000 possesses exceptional cold malleability. It is widely recognized as the premier alloy for severe cold-forming operations such as deep drawing, spinning, bending, and heading.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 68.50 | 71.50 |
Pb | – | 0.07 |
Fe | – | 0.05 |
Total Others | – | 0.30 |
Zn | Remainder | |
Mechanical Properties According To ASTM B927 (As Per Temper HO2)
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 |
12 |
345 |
170 |
10 |
– |
– |
12 |
25 |
310 |
115 |
20 |
– |
– |
|
25 |
50 |
275 |
105 |
20 |
– |
– |
|
| Hex (A/F) | 3 |
12 |
345 |
170 |
10 |
– |
– |
12 |
25 |
310 |
115 |
20 |
– |
– |
|
25 |
50 |
275 |
105 |
20 |
– |
– |
|
| Square (A/F) | 3 |
12 |
345 |
170 |
10 |
– |
– |
12 |
25 |
310 |
115 |
20 |
– |
– |
|
25 |
50 |
275 |
105 |
20 |
– |
– |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1750 |
| Melting Point – Solidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.308 |
| Specific Gravity | 8.53 |
| Electrical Conductivity % IACS at 68°F | 28 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 70 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.1 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 16000 |
| Modulus of Rigidity ksi | 6000 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Good |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Fair |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 30 |
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