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34 Tube Products International May 2014
products & developments
Tel : (86) 311 86219861
Fax: (86) 311 86219891
E-mail:
www. f langescn.com
Materials:
Carbon steel
Stainless steel
Alloy steel
Aluminum
Supplying:
Standard Flange
Non-standard Flange
Customized precision machining
parts and assemblies
Pipe Fittings
High Quality Products
and Reasonable Price
Coating for intricate components
Hardide Coatings, a specialist in
advanced surface coating technology,
hasdevelopedanewsurface engineering
technology to protect both internal and
external surfaces of components from
wear, erosion and acidic corrosion.
Using advanced tungsten-carbide
based coatings, the company provides
engineered solutions to the challenge of
increasing critical component lifetime.
Using low temperature chemical vapour
deposition (CVD), the coatings can be
applied to a wide range of metallic
substrates and complex geometries.
This is an important development for the
tube and pipe industry as the coating
could be highly beneficial for small
sections of critical components and
small diameter pipework.
This is particularly true for high-risk areas
of systems where problems of abrasion
occur, reducing the life of pipes, elbows,
pumps, valves, separators and casings.
Use of Hardide coatings can increase
the lifetime of critical components.
CVD coatings are crystallised from the
gas phase atom-by-atom, producing a
conformal coating that can coat internal
and external surfaces and complex
shapes. CVD takes place in a vacuum
chamber reactor at a temperature of
approximately 500°C.
The coatings are a metallic tungsten
matrix with dispersed nano-particles of
tungsten carbide typically between one
and ten nanometres in size. Dispersed
tungsten carbide nano-particles give
the material enhanced hardness that
can be controlled and tailored to give
a typical range of hardness of between
1,100 and 1,600Hv and, with some
types of Hardide coating, up to 3,500Hv.
Abrasion resistance is claimed to be up
to 12 times better than hard chrome or
500 times better than Inconel.
Nano-structured materials are
known to possess toughness, crack
and impact resistant features. For
example, Hardide-T has proven this
by withstanding 3,000 microstrain
deformation without any damage; this
deformation will crack or chip most
other thick hard coatings.
Other key properties include resistance
to acids (including H2S) and the absence
of porosity. The highly mobile reaction
products fill pores and defects in the
coating as it grows. The porosity,
measured as the difference between
theoretical and actual material density,
is less than 0.04% while the coating
completely covers the substrate without
any through pores starting from less
than 1 micron thickness. Unlike sprayed
tungsten carbide, Hardide does not
use cobalt, which can be affected by
acids. This is especially important for
processing sour oil.
A number of Hardide coating variants
are offered to solve problems such
as severe wear, corrosion or galling.
Applications range from topside to
downhole including mud pumps,
metering, control and shut-off valves,
centrifugal and axial pumps, as well as
bends, liners, elbow joints and flanges.
The coatings can also be used for
fracking and drilling tools including mud
driven hydraulic parts, rotors, stators
and drive parts for turbo-drilling tools.
Other successful applications include
ejector pumps and combustion tubes
for bio-fuel applications.
Hardide Coatings Ltd – UK
Hardide
coated
cylinder
Combustion tube
being pre-treated
for Hardide coating