Alloy Names (as per RoHS specifications)
IS/ISO CuSn5
DIN CEN/TS 13388 CW451K
UNS C51000
JIS C5102
Chemical Composition Weight percentage
Tin [Sn] 4.2 % to 5.8 %
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 : Miniaturized Connectors,Contact Springs,Relais Springs,Terminals,Switch Parts,fuse Clips,Electronic Connectors,Resistance Wire,Wire Brushes.
Fasteners : Lock Washers,Cotter pins,Fasteners.
Industrial : Bellows,Textile Machinery,perforated sheets,Springs,Sleeve Bushing,Clutch Disks.

Properties

Density 8.85 g/cm3
Thermal expansion coefficient - 191..16 17.8 10-6/K
0..300°C 18.1 10-6/K
Specific heat capacity 0.377 J/(g·K)
Thermal Conductivity 96 W/(m·K)
Electrical Conductivity (1 MS/m = 1 m/(O mm²) ≥ 10 MS/m
Electrical Conductivity (IACS) ≥ 17.2 %
Thermal coefficient of electrical resistance (0 .. 200 C) 0.1 10-3/K
Modulus of elasticity (1 Gpa = 1 kN/mm²) cold formed 110 Gpa
120 Gpa
Temper Tensile Strength Yield Strength Elongation Minimum Hardness HV
Rm Rp0.2 A50mm
MPa(N/mm2) MPa(N/mm2) %
O (Soft) 310 Min ≤ 250 45 Min 85 Max
HA (Quater Hard) 350 Min ≥ 300 35 Min 110 Min
HB (Half Hard) 495 Min ≥ 400 10 Min 160 Min
HD (Hard) 570 Min ≥ 500 4 Min 180 Min
HE (Extra Hard) 645 Min ≥ 550 2 Min 200 Min
HS (Spring Hard) 690 Min

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