Material Highlight: ASTM-B740 Alloy C72650

This material is a copper base alloy with both high strength and high conductivity attributes. It provides excellent performance for shielding strips, contacts and connectors.

Chemical Composition (Weight Percent)

  • Nickel - 7.5%
  • Tin - 5%
  • Copper - 87.5%

Physical Properties

  • Electrical Conductivity @ 68°F (20°C) - 14-15% IACS
  • Modulus of Elasticity - 18 x 10 psi (12 x 103 Mpa)
  • Density - 0.32 lb./in3 (8.87 gm./cc)

Benefits

  • Combines high strength and formability
  • High conductivity
  • Available in mill hardened or age hardenable
  • No distortion during aging, no fixturing
  • Excellent solderability and resistance to stress relaxation during high temperature (over 400°F, 200°C) soldering
  • Fine grain size
  • Excellent corrosion resistance bare and easy to plate when required
  • Low initial cost and additional savings during processing
TEMPER DESIGNATION0.05% YS ksi (MPa)UTS Ksi (MPa)Elongation (%)Hardness (VHN)
TD0145-60 (310-413)60-75 (413-517)18150-200
TD0255-75 (379-516)75-85 (517-586)5175-225
TS0190-115 (620-792)130-140 (896-965)8290-340
TS02100-125 (689-861)135-145 (930-999)6300-360
TM0495-115 (655-792)115-135 (792-930)10300-350
TM06100-120 (689-827)120-140 (827-965)10300-360