C3712

C3712, known as Engraving brass, falls under the category of 60/40 alpha-beta brasses. It incorporates varying amounts of lead to enhance its free machining capabilities. This particular brass variety is extensively employed in crafting engraved plates and plaques, manufacturing builders’ hardware, and producing gears. It’s important to note that it’s not suitable for acid etching work, for which the single phase alpha brasses are better suited.

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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