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Home » Cupro Nickel » Cupro Nickel Tubes 95/5, 90/10 & 70/30 Automobile Industries

Cupro Nickel Tubes 95/5, 90/10 & 70/30 Automobile Industries
Metal Gems
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Copper is known to exhibit many good qualities sine many days as it is easy to bend and is highly corrosion resistant but it lacked in corrosion fatigue strength. Thus copper nickel was introduced as it exhibited corrosion resistance similar to copper, a high general strength and good fatigue strength. There is ease of flaring and bending due to good formability. Although costly than it's steel alternative it is attractive owing to it's extra life, safe/ reliable characteristics and hassle free installation.
Cupro Nickel Tubes 95/5, 90/10 & 70/30 Automobile Industries
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Application in the Automotive Industry
The copper nickel that is used for brake tubing generally contains 10% nickel together with iron-1.4% and manganese 0.8%. This product confirms to the ASTM B466( American Society for Testing and Materials) norms that specifies tensile strength, dimensions and yield strength. The Formability and internal cleanliness conforms to specifications like, SAE J527, ASTM A254 and SMMT C5B (Society of Motor Manufacturers and Traders). The alloys also meets the criterias for pressure containment, fabrication and corrosion resistance as per ISO 4038 (International Standards Organization) and SAE J1047.

The table below depicts the mechanical properties of alloy C70600 as compared to steel

The Alloy C70600 is generally supplies in the form of redrawn tubing in the annealed condition. Excellent formability is rendered by way of combination of strength and good ductility. Since Copper-nickel is not as hard as steel, it was thought that there might be problem in fretting but experience has proven it wrong.
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Technical Specifications:-
Dimension Tolerance
Material Ultimate Tensile Strength1000 psi (MPa) Yield Strength 0.5% Ext.under Load 1000 psi (MPa) YElongation % in 2 in. Fatigue Strength (10x7 cycles) 1000 psi (MPa) Burst Pressure* 1000 psi (MPa)
Copper-brazed Steel 48-55 (0.330-0.380) 28-34 (0.190-0.235) 30-40 30 (
C12200-Phosphorus deoxidized Copper 32-38 (0.220-0.265) 10-14 (0.070-0.100) 45-60 10
12 (
C70600-Copper Nickel 90-10 48-54 (0.330-0.370) 16-22 (0.110-0.150) 40-55 15
19 (
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Corrosion Resistance
Prior to it's application as a brake tubing material, the alloy C70600 was used in ships, power station condensers and hydraulic lines on tankers, thus displaying commendable resistance to saline conditions. According to early tests it was evident that copper-nickel exhibits the same resistance to burst pressure like steel.

However, in testing it was revealed that, when exposed to salt spray over 180 days, steel's burst strength decreases significantly and the copper alloy remains consistently resistant. The tubes covered with moist, salty mudpacks for six months, brazed steel was severely corroded that resulted in the perforation of the tubing wall, infact only superficial general corrosion was found on the copper-nickel tubing. ISO 4038 and SAE J1047 possesses a corrosion resistance requirement that refers to ISO 3768 asking for a minimum burst pressure of 110 MPa after 96 hours in neutral salt spray. In all circumstances alloyC70600 exceeds easily the required corrosion resistance.

The copper-nickel brake tubing offers superior reliability thus assuring both manufacturers and vehicle owners improvised durability that ensures effective long life functioning of the brake system.

Copper-nickel brake tubing provides superior reliability and assures both manufacturers and vehicle owners improved durability for effective long-life functioning of the brake system.
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