C27450

UNS C27450, often referred to as yellow brass, is characterized by a copper content of no less than 62%. In the realm of cold forming processes, CuZn37 stands as the predominant brass alloy. Despite the fact that brasses with lower zinc content exhibit superior cold forming properties, CuZn37 remains the most widely utilized alloy. This preference can be attributed to a combination of factors. Firstly, it is economically advantageous due to the lower cost of zinc when compared to copper. Additionally, the forming characteristics of this alloy align well with the requirements of a wide range of applications, making it a versatile and practical choice.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu60.0065.00
Pb0.25
Fe0.35
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO ASTM B927 (AS PER TEMPER HO2)
Range (Inch) From To UTS Min (Ksi) PS Min (Ksi) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 0.059 0.500 53 33 10
0.500 1.000 48 30 13
1.000 2.953 43 28 15
Hexagon (A/F) 0.118 0.500 53 33 10
0.500 1.000 48 30 13
1.000 2.756 43 28 15
Square (A/F) 0.118 0.500 53 33 10
0.500 1.000 48 30 13
1.000 2.362 43 28 15
Rectangle (Thickness) 0.118 0.500 53 33 10
0.500 1.000 48 30 13
1.000 1.969 43 28 15
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 1.5 12 365 230 10
12 25 330 205 13
25 75 295 195 15
Hex (A/F) 3 12 365 230 10
12 25 330 205 13
25 70 295 195 15
Square (A/F) 3 12 345 170 10
12 25 310 115 20
25 50 275 105 20
Rectangle (Thickness) 3 12 345 170 10
12 25 310 115 20
25 50 275 105 20
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1680
Density lb/cu in. at 68°F 0.31
Specific Gravity 8.44
Electrical Conductivity % IACS at 68°F 27
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F 67
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.4
Specific Heat Capacity Btu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tension ksi 15000
Modulus of Rigidity ksi 5600
FABRICATION PROPERTIES 
Technique   Suitability
Soldering Excellent
Brazing Excellent
Oxyacetylene Welding Good
Gas Shielded Arc Welding Fair
Coated Metal Arc Welding Not Recommended
Spot Weld Good
Seam Weld Not Recommended
Butt Weld Good
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Fair
Machinability Rating 35

C27450

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