Polished C31400 Leaded Commercial Bronze Bar, Shape : Round

C31400 Leaded Commercial Bronze

CuZn9Pb2 – UNS.C31400 Lead Commercial Bronze Alloys, which is commonly named "Commercial Bronze", and it is a free machining brass with a higher electrical and thermal conductivity than that of standard free machining brass. C31400 combines the natural corrosion resistance of C22000 with the machinability typical of leaded brasses. Like C22000,it is an alpha brass nominally composed of 89% copper and 9% zinc, but it also contains about 2% lead in order to impart free-cutting characteristics.  The relatively low zinc content of C31400 provides excellent corrosion resistance in potable water along with a pleasing golden color that matches C22000 hardware.  Alloy C31400 is also suitable for outdoor use due to its resistance to stress corrosion cracking and to corrosion in general, but where the highest strength is not required.

Chemical Composition:

Cu: 87.50-90.50%

Pb: 1.30-2.50%

Fe: 0.10% Max.

Ni: 0.70% Max.

Zn: Balance

Note: Copper plus additions equal 99.50% minimum.

Typical Physical Properties:

Specific Gravity: 8.83 g/cm3

Coefficient of Thermal Expansion per °C: 18.40 x 10-6 /K (20-300°C)

Electrical Conductivity (% IACS): 42.0% IACS @ 68 F

Thermal Conductivity (W/mk): 180.0 W/m ∙ ˚K at 20 C 

Modulus of Elasticity: 17000 ksi

Note: 

1). the units are based upon US Customary.

2). the typical physical properties apply to age hardened products.

International Specification: