TPT March 2007

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Stainless S teel Tubing: M anufacturing & Machinery
81 March/April 2007
Tecnofar can adhere to a range of
dimensional tolerances, with a stainless
steel tube range of 0.3 to 76mm and wall
thickness from 0.10 to 3.5mm. These
tubes are produced using stainless steels
provided and guaranteed by leading steel
mills.
ISO 9001:2000 accredited (by Italcert), the
company has been certified by RINA for its
welding system and heat treatment for the
production range of OD 6-19mm and wall
thickness of 0.40 to 1.10mm.
Tecnofar SpA – Italy
Fax: +39 0342 684500
Email:
Website:
G Rau GmbH & Co KG, Germany, is a
leading specialist for innovative metal
solutions and a preferred supplier to various
fields including electrical engineering,
the automotive supply industry and
measurement and control engineering.
The company’s subsidiary Euroflex,
founded in 1993, is a European market
leader in semi-finished products in the field
of medical engineering.
The company is specialised in the
production of high precision semi-
finished products made from precious
metals, stainless steel, special alloys
and composite materials as well as in the
production of parts and assemblies.
Stainless steel tubes are available in
grades including 1.4301 304, 1.4571
316 Ti, and 1.4441 316 LVM (for surgical
implants). They can be supplied with a
seamless or welded finish together with
common austenitic alloys.
These tubes are manufactured with an OD
range from 0.50-12mm and a wall thickness
range of 0.04-0.3mm, depending on the
ratio of outer diameter to wall thickness. In
special circumstances, the company can
even supply tube with an OD up to 20mm,
and wall thickness of >0.3mm.
The tolerance requirements for stainless
steel tubes are continually increasing. As
most seamless stainless steel precision
tubes are manufactured by the drawing
process, there are natural limits to the
attainable dimensional accuracy. This
becomes especially apparent when
tubes are manufactured with larger outer
diameters relative to the wall thickness.
For about five years there has been an
increased demand for large thin-walled
stainless steel tube with narrow tolerances.
Consequently, G Rau has developed a new
procedure that enables the production of
large, thin-walled tubes with very narrow
tolerances on wall and outer diameter.
This product is available with an OD range
of 0.5mm-8mm = ±0.02mm and 8mm-
12mm = ±0.03mm, and a wall thickness
of ±5 per cent standard (minimum of
±0.01mm).
These stainless steel tubes are available
in soft, hard or special strength conditions,
and usually in lengths of 3-4m or fixed
lengths according to user specification.
G Rau – Germany
Fax: +49 7231 208 7366
Email:
Website:
› The redrawn precision tubes are available in
both bar and coil form
Range of production machinery for SS tube
Established in 1976, Ho Chang Machinery Co Ltd is a manufacturer of whole-plant
machinery and equipment for the production of stainless steel tube and pipe. The
company designs and manufactures a range including heat-treatment machines, sizing
machines, straightening machines, polishing machines, chamfering machines, and
hydrostatic test machines.
All equipment, important parts and rolls utilise computer 3D analogue design and CNC
unit processing. The company’s main products are complete sets of production line
equipment for welded stainless steel industrial pipe and mechanical tube, which are in
conformity with ASTM standard of A312, A554, and A249.
The products are widely applied in the industries of petroleum, gas, petrochemical,
paper-making, sanitation, and machinery. They are used and supported by customers in
Canada, Hong Kong, Malaysia, Thailand and China. The company can also undertake
the design and manufacture of rolls, in addition to the construction of a whole plant.
Machinery specifications include complete sets of tube making equipment (HC-AP-40-
130). The production range of this equipment is pipe OD 21.34-406.4mm (thickness:
SCH5S-40S), and tube OD 15.9-114.3mm (thickness: 0.6-3.0mm). The material types
include AISI-304, 304L, 316, and 316L.
Ho Chang Machinery Co Ltd – Taiwan
Fax: +886 4 8730618
Email:
Advanced procedure assures narrow tolerances
on SS thin-walled tube
› G Rau manufactures large, thin-walled tubes
with very narrow tolerances