Chemical Composition
AS1566 – 1997
| Copper | Lead | Iron | Zinc |
| Minimum | 68.5 | - | - | - |
| Maximum | 71.5 | 0.07 | 0.05 | Remainder |
Equivalent Alloy Specifications| Specification | Designation | | UNS | C26000 | | ISO | CuZn30 | | BSI | CZ106 | | JIS | C 2600 |
| Australian Product Specifications| Specification | Product Form | | AS1566 | Rolled Flat Products | | AS1567 | Wrought Bars & Sections | | AS1571 | Seamless Tubes for Air Conditioning & Refrigeration |
|
Fabrication Properties
| Joining Technique | Suitability | | Soldering | Excellent | | Brazing | Excellent | | Oxy Acetylene Welding | Good | | Gas Shielded Arc Welding | Fair | | Coated Metal Arc Welding | Not Recommended | | Resistance Welding (Spot) | Good | | Resistance Welding (Seam) | Good |
| | Fabrication Technique | Suitability | | Capacity for Being Cold Worked | Excellent | | Capacity for Being Hot Worked | Fair | | Hot Working Temperature | 725 - 850 °C | | Annealing Temperature | 375 - 650 °C | | Stress Relieving Temperature | 250 - 300 °C | | Machinability Rating | 30% of free cutting brass | | Polishing/Electroplating Finish | Excellent |
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Mechanical Properties
AS1566, Rolled Flat Products and AS1567 Wrought Rods, Bars & Sections
| Product | Temper | Tensile Strength Minimum | Elongation Minimum | Hardness |
| MPa | % | HV |
| Sheet & Flats | Annealed | < 110 |
| Sheet & Flats <= 2.0mm | 1/2 Hard | 360 | 20 | 110-135 |
| Sheet & Flats 2.1-3.2mm | 1/2 Hard | 340 | 20 | 100-125 |
| Rod & Square Bar >6mm | O | 280 | 45 |
| Rod & Square Bar >6mm | M | 340 | 28 |
| Sheet & Flats <= 2.0mm | Hard | 420 | 3 | 135-165 |
| Sheet & Flats 2.1-3.2mm | Hard | 360 | 3 | > 125 |
Available Forms Austral Wright Metals can supply this alloy as coil, sheet, plate, rods, bars, sections. See alloy C26130 (formerly alloy 259) for tube & fittings.
General Description 70/30 brass has excellent ductility and good strength. It is often used where its deep drawing qualities are needed. The alloy is the most common brass in sheet form. The alloy consists of the face centred cubic alpha phase, and has the optimum combination of strength and ductility in the copper-zinc series. C26000 has the distinctive clear bright yellow colour normally associated with ‘brass’.
Typical applications Architecture, grillwork, appliances, drawn & spun containers and components, radiator cores and tanks, electrical terminals, plugs and lamp fittings, locks, door handles, name plates, plumbers hardware, fasteners, cartridge cases, cylinder liners for pumps.
Physical Properties
| Property | Metric Units | Imperial Units |
| Melting Point (Liquidus) | 965°C | 1770°F |
| Melting Point (Solidus) | 910°C | 1670°F |
| Density | 8.58 gm/cm³ @ 20°C | 0.310 lb/in³ @ 68°F |
| Specific Gravity | 8.58 | 8.58 |
| Coefficient of Thermal Expansion | 20.0 x 10 -6 / °C (20-300°C) | 11.0 x 10 -6 / °F (68-392°F) |
| Themal Conductivity | 120 W/m. °K @ 20°C | 70 BTU/ft³/ft/hr/°F @ 68°F |
| Thermal Capacity (Specific Heat) | 375 J/kg. °K @ 20°C | 0.09 BTU/lb/°F @ 68°F |
| Electrical Conductivity (Annealed) | 0.16 microhm?¹.cm?¹ @ 20°C | 28% IACS |
| Electrical Resistivity (Annealed) | 6.2 microhm.cm @ 20°C | 37 ohms (circ mil/ft) @ 68°F |
| Temperature Coefficient of Electrical Resistance (Annealed) | 0.0015 / °C @ 0-100°C | 0.0008 / °F @ 32-212°F |
| Modulus of Elasticity (tension) | 110 GPa @ 20°C | 16.0 x 10 6 psi @ 68°F |
| Modulus of Rigidity (torsion) | 40 GPa @ 20°C | 6.0 x 10 6 psi @ 68°F |
| Poisson's Ratio | 0.33 | 0.33 |
Phase Diagram & Mechanical Properties
Corrosion Resistance
C26000 has good corrosion resistance to weathering and very good resistance to many chemicals. It may undergo dezincification in stagnant or slowly moving salt solutions, brackish water or acidic solutions. Although it will resist most waters, C26130 is preferred as it contains a small arsenic addition which inhibits corrosion. C26000 should not be used in contact with ammonia or ammonia compounds, as it may suffer stress corrosion cracking. Beware of corrosion inhibitors in piping systems containing carbon steels, which should be checked for compatibility with alloy C26000. 70/30 brass should not be used with acetic acid, acetylene, brines, calcium chloride, moist chlorine, chromic acid, hydrochloric acid, mercury or its compounds, nitric acid and sodium hypochlorite. Please consult Austral Wright Metals for your specific application.
