TPi July 2010

Stainless steel tubes

6m plate pipe production for urgent requirements

H Butting GmbH & Co KG, Germany, is able to supply individual solutions to customers who require duplex pipes for urgent repairs, who have to cover shortages of thick-walled pipes at short notice, or who need pipes in special sizes as quickly as possible. Since stainless steels were first developed, the production of high- quality longitudinally welded pipes has been the company’s focal point. When longitudinally welded stainless steel pipes are required, even in small numbers or in special sizes or materials, Butting manufactures them from steel plate. The company has enlarged its stocks of the necessary pre-materials,

to ensure that they can satisfy individual pipe requirements with short delivery times at a high level of quality. As well as the standard materials, 1.4541 and 1.4571, the company’s store in Knesebeck also includes steel plates of TP 304L and TP 316L. To cover urgent requirements, the family-owned company can produce pipes with wall thicknesses from 6.35 to 12.7mm. The company also specialises in storing steel plate in duplex or super duplex. Butting can manufacture, within a very

The company can supply thick-walled pipes at short notice

short time, duplex pipes (UNS 31803 or UNS 32205) in wall thicknesses from 4.78 to 22.7mm. Super duplex steel plates (UNS S32760) in wall thicknesses from 4.78 to 12.7mm are held in store for quick delivery in sizes specific to customers’ projects. These newly stored steel plates mean that the store now comprises around 300t. In this area of production Butting uses traditional TIG, plasma-TIG and submerged arc welding technologies, but is also one of the few manufacturers in Europe to use the effective electron beam welding technology. To ensure the best possible surface condition, only top quality pre-materials are used, and the pipes are all supplied pickled and passivated. H Butting GmbH & Co KG – Germany info@butting.de www.butting.de

Photo credit: copyright H Butting GmbH & Co KG

Butting manufactures longitudinally welded stainless steel pipes from steel plate

Bright annealed seamless stainless steel tubes

Technofin International Pvt Ltd is a manufacturer of bright annealed seamless stainless steel tubes. The technology employed is oil-draw cold finishing of quality pipes/hollows to re-draw, and annealing in reducing atmosphere for bright finish. The company’s bright annealing facility uses state-of-the-art induction heating technology. Tubes are manufactured in two type of ID surface finish grades: High Finish – Ra <20µin (0.50µm); and Industrial Finish – Ra <100µin (2.50µm).

cold finishing, whereas bright annealing is used to avoid forming oxide layers on the tube surface during the heating process. Induction heating has the basic advantage of quick temperature rise facilitating the achievement of bright surface under reducing atmosphere. An additional advantage is removing (melting) surface cracks of the tubes during heating due to higher resistive path, helping the production of tubes without internal defects. A further inherent advantage is the uniform heating of tubes in cross section, helping to improve mechanical properties and microstructure uniformity,

eg when bent, the tubes do not spring back, and IGC tests show good results.

Lengths available are: coil – 20-300m (65-100ft), straight – 2-6m (6-20ft). Outer diameters range from 1.58 to 25.4mm (1/16" to 1"), and wall thicknesses from 24 SWG/0.5mm to 14 SWG/2.11mm (0.02" to 0.083"). The company uses stainless steel 300 series dual grades, and manufactures to ASTM, ASME, DIN and JIS standards, or to specific requirements. Technofin International Pvt Ltd – India technofin@sify.com info@technofin.in

The advantage of the oil-draw process is to provide smooth surface finish during

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Tube Products International July 2010

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