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Yuhong Holding Group Co.,LTD
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ASME SB171 C71500 Copper Nickel 70/30 Tube Sheet used in Heat Exchangers
What is tubesheet ?
A tube sheet is a plate which is used to support the tubes in a shell-and-tube heat exchanger. The tubes are aligned in a parallel way, and supported and held in place by tube sheets. The tube sheet is a circular plate which is perforated so that the tubes can fit through the openings.
Description
C71500 is an alloy of copper and nickel, and because Ni is infinitely soluble in Cu, C71500 has a single alpha phase structure. C71500 alloy not only has good comprehensive mechanical properties, but also becomes easy to weld due to thermal conductivity close to carbon steel, no preheating is required before welding, and no heat treatment is required after welding.
C71500 is 70Cu-30Ni alloy, mainly composed of Cu and Ni, containing a small amount of Mn and Fe, which can better prevent seawater corrosion, limiting impurity elements Zn, C, Pb, S, P, etc., can improve the thermoelectric rate and weldability.
Chemical Composition
| Element | Content (%) |
| Copper, Cu | 70.0 |
| Nickel, Ni | 30.0 |
Physical Properties
| Properties | Metric | Imperial |
| Density | 8.94 g/cm3 | 0.323 lb/in3 |
| Melting point | 2140°F | 1171°C |
Corrosion resistance of C71500 in seawater
: Cu-ni alloy shows good corrosion resistance in seawater, on the one hand, because Cu itself has a low electrode potential, it is difficult to directly oxidizing Cu in neutral seawater; In addition, it is also because Cu can form a protective oxidation product film in seawater, preventing further corrosion reactions. When the environment of seawater is basically unchanged, the properties of surface film directly affect the corrosion resistance of copper-nickel alloy in seawater. The present research has revealed the corrosion state and corrosion reasons of copper-nickel alloy under different conditions to a certain extent, which is helpful to more accurately study the corrosion process of copper-nickel alloy and the influence of alloying elements on the corrosion resistance.
Features and applications
The UNS C71500 cupronickel alloy is primarily used in seawater operations requiring forged and machined pump and valve components, hardware and fittings. This alloy can also be widely used in areas requiring high corrosion resistance, and where chloride stress-corrosion cracking precautions prevent usage of stainless steels.
Shell heat exchanger, boiler, pressure vessel, steam turbine, large central air conditioning
Let's wait. Customized high-precision tubesheet is mainly used in chemical containers, such as tube-shell type
Heat exchangers, boilers, pressure vessels, condensers, central air conditioners, evaporators, seawater desalination, etc., have the function of supporting fixed shell tubes
Thermal performance.
Application
