TPT September 2008

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September 2008 54
Technology Update
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GEBR. LENNARTZ GMBH & CO. KG
Hohenhagener Str. 46 • D-42855 Remscheid
P.O.-Box 11 04 69 • D-42864 Remscheid
Fon: +49 (0) 21 91 / 99 60–0
Fax: +49 (0) 21 91 / 99 60-60
Email: •
No better way to cut
Saw Bodies for Segmental Circular Cold
Saw Blades, Carbide Tipped Circular Saw
Blades and Diamond Circular Saw Blades
Carbide Tipped Circular Saw Blades
up to 2200 mm diameter for cutting
steel and non-ferrous metals
Segmental Circular Cold Saw Blades
from 250 to 1610 mm diameter
ECOmax – High performance
Circular Saw Blades for cutting steel
and non ferrous metals
Hot and Friction Circular Saw Blades
up to 2500 mm diameter
HSS Metal Circular Saw Blades
in all sizes
Band Saw Blades for cutting metals
Hand Hack Saw Blades
and Power Hack Saw Blades
Circular Sawing Machines
Rösler, Germany, has become well
established for its range of fully automatic
systems that are centred on either a roller
conveyor or tube blaster. In one equipment
construction, designed to protect tubes from
corrosion, customization included automatic
stacking of the treated components.
A temporary corrosion protection coating
(welding primer) ensures that the
components do not deteriorate, physically
or visually, during their transport by ship
or rail. For many steel users, preservation
of the products is a major factor in the
purchase of steel.
Rösler designs and builds preservation lines
and accessory equipment, which fully meet
all customer specifications for metal sheets,
I-beams, tubes and round bars. The focus
is on cost effective processing of the parts
and a high equipment uptime.
The turnkey preservation lines are usually
complemented with specially designed
transport systems, a pre-heater, the roller
conveyor shot blast machine, an automatic
paint system and a paint drier.
At the heart of any preservation line is
the shot blast machine, which frequently
requires design modifications for blasting
the customer-specific parts. This ensures
that the parts are sufficiently cleaned (for
example according to SA 2,5 standards) to
allow problem-free coating with a welding
primer.
Rösler has supplied a number of recent
high-profile projects with preservation lines
for steel tubes, including Perwouralskij
in Russia and Mittal Steel in the Czech
Republic. Since the surface cleanliness
requirements were not very strict, the
preservation lines were designed without
shot blasting. However, a later upgrade with
a shot blast machine is possible.
Rösler received knowledge of both projects
through its sister company in Romania. The
customers’ specifications called for coating
of the parts with temporary corrosion
protection paint for tubes with a length of
4-13.5m and OD of 133-273mm with a
minimum of paint loss. In addition, special
information like part length and weight
had to be stenciled onto the parts prior to
stacking in bundles and packaging.
The Rösler engineers – together with
technical personnel from Mittal Steel in
Ostrava – developed a fully automatic
system with a capacity of 164 tubes of 6m
in length or 120 tubes of 12m in length
Efficient coating and
material handling of tubes
 Shot blast systems as part of a preservation line
are specially designed for the customer parts.
This ensures that required degrees of cleanliness
(for example according to standard SA 2,5) are
achieved prior to coating the parts with a welding
primer