C27453

C27453 is a lead-free yellow brass alloy (UNS designation) designed to provide good strength, machinability, and corrosion resistance while eliminating lead for compliance with modern environmental and health standards. It is widely used in plumbing, fittings, and components where lead-free materials are required.

Chemical Composition

Elements	Min (%)	Max (%)
Cu	61.50	63.50
Pb	0.00	0.25
Sn	0.00	0.15
Fe	0.00	0.15
Zn	Remainder
As	0.02	0.15

Mechanical properties according to ASTM B283 C27453 (as per temper M10)

Range (inch)		UTS Min (ksi)	UTS Max (ksi)	PS Min (ksi)	Elongation Min (%)	Hardness
Range (inch)		UTS Min (ksi)	UTS Max (ksi)	PS Min (ksi)	Elongation Min (%)	Hardness Min (HRB)	Hardness Max (HRB)
Round (Dia)	0.25 – 3.00	49	–	29	30	–	–
Hex (A/F)	0.25 – 2.5	49	–	29	30	–	–
Square (A/F)	0.25 – 2.35	49	–	29	30	–	–
Rectangle	Thickness: 0.25 – 2.00	49	–	29	30	–	–
Rectangle	Width: 0.50 – 3.00	49	–	29	30	–	–

Range (mm)			UTS Min (MPa)	UTS Max (MPa)	PS Min (MPa)	Elongation Min (%)	Hardness Min (HRB)	Hardness Max (HRB)
Range (mm)			UTS Min (MPa)	UTS Max (MPa)	PS Min (MPa)	Elongation Min (%)	Hardness Min (HRB)	Hardness Max (HRB)
Round (Dia)	6.5	75	340	–	200	30	–	–
Hex (A/F)	6.5	65	340	–	200	30	–	–
Square (A/F)	6.5	60	340	–	200	30	–	–
Rectangle	Thickness	6.0 – 50	340	–	200	30	–	–
Rectangle	Width	12.0 – 75	340	–	200	30	–	–

PHYSICAL PROPERTIES
Density	~0.31 lb/cu in (8.42 g/cm³)
Melting Range	1650–1680 °F (899–916 °C)
Electrical Conductivity	~28% IACS (International Annealed Copper Standard)
Thermal Conductivity	~68 Btu/sq. ft/ft hr/°F (good heat transfer ability)
Coefficient of Thermal Expansion	11 × 10⁻⁶ per °F (68–212 °F)
Modulus of Elasticity (E)	~15,000 ksi (approximate)
Specific Heat Capacity	~0.09 Btu/lb/°F

FABRICATION PROPERTIES
Technique	Suitability
Soldering	Excellent
Brazing	Excellent
Welding	Excellent
Capacity for Being Cold Worked	Excellent
Capacity for Being Hot Worked	Excellent
Forgeability Rating	90
Machinability Rating	40