Phosphor Bronze Grade-III [ PB-III ]

Alloy Names (as per RoHS specifications)
IS/ISO	CuSn6
DIN CEN/TS 13388	CW452K
UNS	C51900
JIS	C5191

Chemical Composition	Weight percentage
Tin [Sn]	5.5 % to 7.0 %
Phosphorus [P]	0.02 % to 0.10%
Zinc [Zn]	0.30% Maximum
Lead [Pb]	0.05 % Maximum
Copper [Cu]	Remainder %

Characterists
Excellent combination of strength, formability and hardness. Good electrical conductivity and corrosion resistance. Excellent Soldering and brazing properties. Possessing excellent mechanical strength along with desirable ductility for sheet metal processing.

Main Applications
Electrical : Contact Springs,Electrical Flexing,Contact Bladers,Terminals,Switch Parts,Electrical Flexing. Fasteners : Lock Washers,Cotter pins,Fasteners. Industrial : Textile Machinery,Perforated Sheets,Springs,Sleeve Bushing,Clutch Disks. General : Stamped parts,Connectors,Contact Springs,Spring Elements.

Phosphorus Bronze Strips

Phosphorus Bronze Strips

Request a Quote

Properties

Physical Properties Typical values in annealed temper at 20°C
Mechanical Properties (EN 1652)

Density	8.8	g/cm3
Thermal expansion coefficient - 191..16	18	10-6/K
0..300°C	18.5	10-6/K
Specific heat capacity	0.377	J/(g·K)
Thermal Conductivity	75	W/(m·K)
Electrical Conductivity (1 MS/m = 1 m/(O mm²)	≥ 8	MS/m
Electrical Conductivity (IACS)	≥ 13	%
Thermal coefficient of electrical resistance (0 .. 200 C)	0.65	10-3/K
Modulus of elasticity (1 Gpa = 1 kN/mm²) cold formed	102	Gpa
	118	Gpa

Temper	Tensile Strength	Yield Strength
	Rm	Rp0.2
	MPa(N/mm2)	MPa(N/mm2)
O (Soft)	340 Min	≤ 300
HA (Quater Hard)	385 Min	≥ 350
HB (Half Hard)	525 Min	≥ 400
HD (Hard)	620 Min	≥ 500
HE (Extra Hard)	695 Min	≥ 590
HS (Spring Hard)	720 Min	≥ 650