Copper Alloys C26000 70-30 Brass

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

Mechanical Properties

AS1566, Rolled Flat Products and AS1567 Wrought Rods, Bars & Sections

Product	Temper	Tensile Strength Minimum	Elongation Minimum	Hardness
Product	Temper	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

Copper Alloys 70-30 Brass UNS-C26000 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.

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.