The chemical industry requires specific construction materials and uses a wide range of corrosion resistant alloys in equipment exposed to highly corrosive environments, high pressures and temperatures. voestalpine Böhler Welding supplies specifically designed welding consumables for the main welding processes applied in the manufacturing of chemical industry components such as vessels, tanks, valves and pumps, etc. 

For the demanding requirements of wet corrosion in presence of chlorides and other highly corrosive media, the entire range of nickel alloys from Alloy 625 to the sophisticated Alloy 59 or C22, is covered by welding consumables tested with the all relevant corrosion testing methods required by the industry. voestalpine Böhler Welding also offers high-quality solutions for welding duplex and lean duplex stainless steel with all welding processes as well as specific solutions for special austenitic and super austenitic steels.

voestalpine Böhler Welding has an extensive database of corrosion tests on welded joints performed in various corrosive media with excellent qualitative (indications) and quantitative (corrosion rates and critical temperatures) results. For the inorganic chemical processing industry, voestalpine Böhler Welding offers rods, wires and covered electrodes for the high silicon (~4%) austenitic base material required at very high nitric acid concentration (>67%) to ensure execellent corrosion resistance up to boiling point.

The pressure retaining materials are generally low alloyed Mn-Mo-Ni steel. The shells and tube sheets are then lined or overlay welded at the points where the surfaces come in contact with the process fluid. Piping can be either bi-metallic, lined or made entirely of stainless steel urea grades (e.g. 316L UG and 310MoL).

When welding stainless steel urea grades, special care must be taken to avoid undesirable intermetallic phase precipitations by closely controlling the welding parameters and the interpass temperature. For this reason, the most commonly used welding processes for joining are GTAW and SMAW.

voestalpine Böhler Welding has a specific and solid background in this industry and is proficient in all applicable welding processes. The special welding consumables grades 310MoL and 316L UG for joining and cladding in the high-pressure area of urea production plants show excellent results in the Huey corrosion test and are widely used, well referenced and approved by the main licensors and process engineering companies.