Cupro Nickel Tubes 95/5, 90/10 & 70/30 Automobile Industries : he Move toCopper-Nickel Tubing Copper had been provedsince the early days to have many good attributes. It was easy to bend and hadvery high corrosion resistance, but there was concern about its lowcorrosion-fatigue strength. When copper-nickel was introduced, it displayedcorrosion resistance similar to copper, higher general strength and betterfatigue strength. Good formability allows ease of flaring and bending, andalthough the metal cost is greater than that of steel alternatives,copper-nickel is very attractive in view of its extra life, trouble-freeinstallation and safety/reliability characteristics. Properties ofCopper-Nickel Brake Tubing The copper-nickelalloy used for brake tubing typically contains 10% nickel, with iron andmanganese additions of 1.4% and 0.8% respectively. The product conforms to ASTMB466 (American Society for Testing and Materials), which specifies dimensions,tensile strength and yield strength. Formability and internal cleanlinessconform to specifications SAE J527, ASTM A254 and SMMT C5B (Society of Motor Manufacturersand Traders). Also, the alloy meets the requirements for pressure containment,fabrication and corrosion resistance for ISO 4038 (International StandardsOrganization) and SAE J1047. The mechanicalproperties of alloy C70600 in comparison with steel and copper are shown inspecification. Alloy C70600 isnormally supplied as redrawn tubing in the annealed condition. The combinationof strength and good ductility give excellent formability. As copper-nickel issofter than steel, it was first feared that fretting might be a problem.Experience has shown this is not the case. Copper-nickel braketubing provides superior reliability and assures both manufacturers and vehicleowners improved durability for effective long-life functioning of the brakesystem.