Alloy Names (as per RoHS specifications)
IS/ISO CuSn8
DIN CEN/TS 13388 CW453K
UNS C52100
JIS C5210
Chemical Composition Weight percentage
Tin [Sn] 7.5 % to 9.0 %
Phosphorus [P] 0.02 % to 0.10%
Zinc [Zn] 0.30% Maximum
Lead [Pb] 0.05 % Maximum
Copper [Cu] Remainder %
Characterists
  • Possessing excellent wear resistance & mechanical strength.
  • Good Anti errosion properties hence used in bearing material.
  • Excellent spring properties, good cold forming and soldering properties.
Main Applications
Electrical : Contact Springs,Electronic Connectors, Electrical Connectors,Cold Headed Parts,Contact Blades,Wire Brushes,Switch, Parts,Fuse Clips.
Fasteners : Cotter Pins,Heavy duty ,Lock Washers.
Industrial : Cold Headed Parts,Thrust Bearings,Doctor Blades,Paper Industry,Bourdon Tubing,Well Drill Equipment,Perforated Sheets .

Properties

Density 8.8 g/cm3
Thermal expansion coefficient - 191..16 18 10-6/K
0..300°C 18.7 10-6/K
Specific heat capacity 0.377 J/(g·K)
Thermal Conductivity 67 W/(m·K)
Electrical Conductivity (1 MS/m = 1 m/(O mm²) ≥ 65 MS/m
Electrical Conductivity (IACS) ≥ 11 %
Thermal coefficient of electrical resistance (0 .. 200 C) 0.65 10-3/K
Modulus of elasticity (1 Gpa = 1 kN/mm²) cold formed 109 Gpa
115 Gpa
Temper Tensile Strength Yield Strength Elongation Minimum Hardness HV
Rm Rp0.2 A50mm
MPa(N/mm2) MPa(N/mm2) %
O (Soft) 345 Min ≤ 300 50 Min 100 Max
HA (Quater Hard) 405 Min ≥ 350 40 Min 125 Min
HB (Half Hard) 475 Min ≥ 400 15 Min 175 Min
HD (Hard) 585 Min ≥ 500 5 Min 200 Min
HE (Extra Hard) 670 Min ≥ 600 2 Min 220 Min
HS (Spring Hard) 720 Min ≥ 700 240 Min

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