TPi May 2015

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54 Tube Products International May 2015
Stainless steel tubes
Stainless steel pipes and fittings
Borsen Boru, founded in 1983, is not
only a distributor of stainless steel
pipes, valves and fittings but also a
manufacturer of TIG welded stainless
steel pipes.
The company, which carries a wide
range of products from manufacturers
in Europe, supplies its products and
services to companies in a wide range
of sectors, including the petrochemical,
chemical, energy, shipbuilding,
mechanical engineering, construction,
food and beverage production, pipeline
installation and trading sectors in Turkey.
Borsen Boru has built up a wealth of
knowledge and expertise in products,
their application and distribution as
a logistic specialist. The company is
the Turkish representative and single
distributor of Ham-Let for valves and
fittings, as well as of Alfa-Laval for
sanitary flow equipment. Founded in
1950, the Ham-Let Group specialises
in the design, development, production
and marketing of instrumentation valves
and fittings in a wide variety of materials
for high pressure, temperature and
vacuum applications.
Alfa-Laval started its business in 1883
with the continuous milk separator,
and from that point has remained a
front runner in new developments for
fluid handling equipment, including
valves, installation material and tank
equipment, which can be delivered from
Borsen Boru’s warehouse upon request.
In 2006 Borsen Boru started to
manufacture TIG welded stainless steel
pipes and hollow sections in its own
facilities. The company’s test laboratory
is an important part of the quality
assurance process. Various destructive
and non-destructive test procedures are
available, such as eddy current testing,
surface roughness measurements,
hardness test, tensile test, bend test
and chemical analysis.
Manufacturing processes such as
tricathode TIG (GTAW 141) welding,
inside bead removal, in-line bright
annealing, straightening, surface
finishing and tube end de-burring allow
Borsen to meet delivery expectations.
The company’s production line has two
eddy current systems. The first is used
to detect defects of incomplete welding,
and the second is used to check whole
pipe sections after the annealing
process. Borsen issues inspection
certificates according to EN 10204:2004
3.1 and according to pressure vessel
directive PED 97/23/EC.
Borsen Boru – Turkey
Steeling ahead
Chandan Steel Ltd (CSL) manufactures
a wide variety of stainless steel long
products, including round bars, angles,
channels, flat bars, wires and flanges,
and claims to be India’s only fully
integrated manufacturer of stainless
steel seamless tubes and pipes.
With a history of manufacturing
operations spanning three decades,
the company exports to more than
60 countries worldwide. In 2011
CSL acquired the German flange
manufacturing plant M/s Zapp
Flanschenfabrik GmbH. The company’s
production facility for seamless tubes
is supported by machines that comply
with high quality standards. The
steel plant at Umbergaon, India, has
an in-house integrated facility for the
production of raw materials. Round bars
of different austenitic, ferritic, Duplex
and Super Duplex grades are produced
by conducting quality checks at different
stages of manufacturing, before finally
being used by the seamless tubes
division.
CSL uses the cross roll piercing method
for production of defect-free seamless
stainless steel hollows. The use of
in-house produced billets with controlled
cleanliness levels and OD peeling has
helped in eliminating surface inclusions.
Maintaining limited delta ferrite levels
in the raw material has contributed
towards avoidance of cracks. Rolling
is carried out at minimum temperatures
to improve surface finish and eliminate
rupture, and a process has been set of
high-pressure water descaling of billet,
before rolling. CSL regularly uses glass
lubrication on OD and ID of billets
during rolling, and has eliminated
surface defects through minimisation
of surface torsional and circumferential
stress deformation by adjusting feed
and cross roll angles.
Tube straightening machines ensure
minimal residual stress level in the
products, which is specifically required
for critical applications.
Chandan Steel Ltd – India