Maass - Part of the GMI Group

About us

Specialist in stainless, duplex and high nickel alloy flanges. NORSOK & Equinor approved.

Wilhelm Maass GmbH is a specialist manufacturer of high-quality industrial flanges and forged components in stainless steel, duplex, super duplex and high nickel alloys.

Our product range includes weld neck, blind, slip-on, threaded and socket weld flanges, as well as forged rings, discs and blocks. We manufacture standard and customised solutions for demanding applications in the oil and gas, petrochemical, chemical, energy, offshore, shipbuilding and industrial sectors.

With production plants in Germany, India and Mexico, the GMI Group offers flexible and competitive manufacturing solutions for project requirements, individual orders and demanding customer specifications. Small quantities and individual pieces are possible, with no minimum order quantity for many products.

Our fast-track service enables short delivery times for standard items, while our German production focuses on complex, high-specification and quality-critical requirements. We combine technical expertise, competitive manufacturing and reliable project coordination.

Wilhelm Maass GmbH is part of the GMI Group, an international group specialising in stainless steel, alloy products and engineered industrial solutions. Within the group, Maass Special Alloys Nederland B.V. acts as a stockist of high nickel alloy pipes, fittings and flanges. Integrity Stainless & Alloy Ltd. in the United Kingdom is a stockist of stainless steel, duplex and super duplex bar.

The group is further supported by Maass Global Singapore and Wilhelm Maass Middle East, strengthening our international presence and customer support.

Wilhelm Maass is an approved manufacturer for NORSOK and Equinor TR2000 requirements and supplies products according to international standards and customer specifications. Our focus is on consistent quality, dependable service, flexible manufacturing solutions and long-term partnerships worldwide.