Economical alternative for apparatus and plant engineering firms

Schoeller Werk adds longitudinally welded tubes made of the new material VDM Alloy 31Plus® to its product range, thus offering apparatus and plant engineering firms an economical alternative to tubes made of higher-priced nickel-base alloys.

With immediate effect, the specialist for longitudinally welded stainless steel tubes also makes product solutions from the material VDM Alloy 31Plus® / 2.4692. The Ni-Fe-Cr-Mo alloy with added nitrogen and a chromium level of 26 - 28% shows particularly high resistance under oxidising conditions. The material is therefore suitable above all for all applications in the chemical process industry, for components used in flue gas desulphurisation and waste incineration as well as systems for producing and processing sulphuric and phosphoric acid.

"Giving due consideration to the material's specific welding and heat treatment parameters, we are able to process the nickel-base alloy VDM Alloy 31Plus® / 2.4692 without any complications. With immediate effect, we are now in a position to provide apparatus engineering firms and final users with yet another tube quality that is safe to weld", says Werner Hannig, Head of Sales, Technology & Development at Schoeller Werk.

The longitudinally welded tubes are made with TIG welding without using filler metals. Weld quality is assessed with a factor of 1.0 so that the material fulfils the requirements of specification AD 2000-W2 of the Working Group on Pressure Vessels. Schoeller Werk now supplies longitudinally welded tubes made of VDM Alloy 31Plus® in calibrated condition or cold worked in the weld area and annealed, in dimensions ranging from AD 9 to 60.3 mm and Wd 0.70 to 3.00 mm, to users in the apparatus engineering industry who face compulsory acceptance tests.