C3712

C3712, classified as Engraving brass, are alpha-beta brasses with a 60/40 composition, incorporating varying quantities of lead to enhance free machining attributes. These alloys find extensive application in engraved plates and plaques, builders’ hardware, and gear manufacturing. It’s essential to note that they are not suitable for acid etched applications, where single phase alpha brasses are more appropriate.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu58.0062.00
Pb0.251.20
Fe+Sn0.80
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN12164 (AS PER TEMPER R410)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 6 75 315 15
Hex (A/F) 6 70 70 15
Square (A/F) 6 60 315 15
Rectangle (Thickness) 6 50 315 15
PHYSICAL PROPERTIES
Melting Point – Liquidus°F 1650
Melting Point – Solidus°F 1630
Density lb/cu in. at 68°F 0.304
Specific Gravity 8.41
Electrical Conductivity % IACS at 68°F 27
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F 69
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.6
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 Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended
Not Recommended Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Fair
Capacity for Being Hot Formed Excellent
Machinability Rating 70

C3712

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