TPi January 2008

developments products &

and category based on standard and includes annealing and tempering. The pipes’ quality is monitored by considerable testing, which includes stretching, flattening, dispensing, chemical analysis, hydro and eddy- current and ultrasonic (for availability of longitudinal, transversal defect, exfoliations). The process flow currently includes hot rolling through the piercing mill, continuous rolling mill and sizer. To exclude the influence of limescale (as a result of heating) at surface, the line is equipped with a capacity of descaling water (p=160atm). Needing to provide the highest quality of heat treatment (normalising and tempering), the tempering furnace of 111m has been considerably upgraded. The company has also installed a new finishing line which includes equipment for pipe straightening in oblique roll straightening machines, pipe facing, finishing line control room, geometry measuring and a non-destructive

As a result of these circumstances, Interpipe launched a new line for the production of boiler pipes up to 24m in length and 31.8 to 114.3mm in diameter, according to ASTM, DIN, EN standards. The new production line is situated at one of the company’s mills – Interpipe Niko Tube. The first step was the test rolling of boiler pipes from low-alloy steel grades 13CrMo4-4, 16Mo3, 13CrMo4-5, 10CrMo9-10 in the range from 32 to 76mm. As a result of test rolling, many of the issues associated with boiler pipe production were identified and defined, such as the high requirements of metal cleanness, internal cleanness (descaling) and external surface and precision of geometric measurements. The advantages of rolling at pipe- rolling mill 30-120 are: high quality of internal surface (due to free moving long mandrel); availability of large squeezes at 24 stand stretch-reducing mill that helps to avoid internal cutting; and high total deformation providing high quality metal structure.

Finishing line at Interpipe p

The company made the decision to reduce the diameter of boiler pipes from 57 to 32mm.

The heat treatment of boiler pipes depends on the grade of steel, class

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Progress by Tradition For more than 225 years BUTTING has been supporting the customers with its skill and innovations. We produce longitudinally welded stainless steel and clad pipes, fittings, piping components and vessels for end users all over the world and for many industrial sectors: e.g. chemical industry, oil and gas industry, ship-building and food industry, pneumatic conveyors and water treatment plants.

Experience and flexibility make it possible to offer many services – from the selection of appropriate materials to the despatch of piping components ready for use. Come and see for yourself!

For more information and our new brochure, please refer to www.butting.de

Come and visit us! Hall 6, stand 6A50

H. BUTTING GmbH & Co. KG 29379 Knesebeck · Germany Phone: +49583450-0 e-mail: info@butting.de

P ROGR E S S BY T R AD I T I ON

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January 2008 Tube Products International