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.

Properties

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

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