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.The material of the metal makes it not only very rigid, but also
has a great conductance
Thermal performance.
Application
- Heat Exchangers and Condensers
- Seawater Systems
- Oil and Gas Industry
- Chemical Processing
- Power Generation
- Desalination Plants
- Petrochemical Industry
- Shipbuilding
