Copper Alloys 70-30 Arsinical Brass C26130 – Austral Wright Metals

 

Copper Alloys 70-30 Arsinical Brass C26130

 Product Data Sheet – Copper Alloys

70/30 Arsinical Brass Alloy 259   UNS-C26130

Chemical Composition

AS1572-1998

CopperLeadIronZincArsenic
Minimum
69.0
–
–
–
0.02
Maximum
71.0
0.05
0.05
Remainder
0.06

Equivalent Alloy Specifications

SpecificationDesignation
UNS
C26130
ISO
CuZn30As
BSI
CZ126
JIS
~C 4430

Australian Product Specifications

SpecificationProduct Form
AS1567Wrought Bars & Sections
AS1569Seamless Tubes for Heat Exchangers
AS1572Seamless Tubes for Engineering Purposes

Fabrication Properties

Joining TechniqueSuitability
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 TechniqueSuitability
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

AS1572, Seamless Tubes for Engineering Purposes

Temper
Tensile Strength Minimum
Elongation Minimum
Hardness
MPa
%
HV
Annealed
280-350
40
80 (max)
1/4 Hard
320
35
80-105
1/2 Hard
–
–
95-130
Hard
400
–
150 (min)

Available Forms Austral Wright Metals can supply this alloy as tubes & fittings.

General Description 70/30 arsenical brass is used for heat exchangers, plumbing tube and fittings, drain & vent pipes and other applications requiring excellent corrosion resistance in waters.

The alloy is the most common brass, 70/30 brass (C26000), with the addition of a trace quantity of arsenic as a corrosion inhibitor. Mechanical properties are unaffected by the arsenic addition, but corrosion resistance is greatly improved. The alloy is sometimes referred to as ‘DR’ or dezincification resistant brass.

The alloy consists of the face centred cubic alpha phase, and has the optimum combination of strength and ductility in the copper-zinc series.

C26130 has the distinctive clear bright yellow colour normally associated with ‘brass’.

Physical Properties

Property
Metric Units
Imperial Units
Melting Point (Liquidus)
965°C
1770°F
Melting Point (Solidus)
910°C
1670°F
Density
8.55 gm/cm³ @ 20°C
0.310 lb/in³ @ 68°F
Specific Gravity
8.55
8.55
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)
0.161 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 Arsinical Brass C26130 - properties

Corrosion Resistance

C26130 has good corrosion resistance to weathering and very good resistance to many chemicals. It is suitable for use with most waters, and can be used underground because it resists soil corrosion. It can be used for all potable waters, many industrial and mine waters, seawater and brackish water. The minor arsenic addition acts as a very capable corrosion inhibitor, giving substantially better corrosion performance in waters than uninhibited 70/30 brass.

C26130 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 C26130.

Please consult Austral Wright Metals for advice on 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.

 

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