Special materials

We use special alloys for extremely high resistance to aggressive media and corrosion which falls above the normal types of steel. The SERTO Group has extensive know-how in the preparation of other alloys such as Hastelloy® and Monel®, but also Incoloy®, Inconel®, SMO®, Duplex and Superduplex.
Due to the high material costs and demanding processing (for example longer production times, higher wear of coolants and tools), long-standing experience with special alloys is an important pre-requisite for high efficiency. Ask your EXMAR advisor for solutions to your challenges!


Hastelloy® is the brand name of a steel alloy from the US company Haynes International Inc. The main agent is today one with the best qualities of the nickel-chrome-molybdenum-group with regard to corrosion, resistance to pitting corrosion or split corrosion.

MaterialHastelloy C-22 (CX2M alloy)
Melting pointapprox. +1350°C
Application (Selection)wastewater treatment, exhaust gas cleaning for incineration plants, oil industry
Suitable for (Medium)wet media with higher temperatures under oxidising and reducing conditions (acids and acid mixtures), high resistance to crevice, pitting and stress corrosion


Monel®, a brand from the US company Special Metals Corporation, is a nickel-copper alloy with high stability and outstanding corrosion resistance, specifically at high flow velocities.

MaterialMonel (2.4360, UNS N 04400, Alloy 400, Nicorros)
Melting pointapprox. +1350°C
Applications (selection)water treatment, ocean-going vessels, oil platforms
Suitable for (Medium)wet media with high flow velocities (seawater, hydrofluoric acid, sulphuric acid, alkalis)


SMO® is a nickel-copper alloy with high strength. Due to the high molybdenum content and the addition of nitrogen, the material has good mechanical properties and very good resistance to pitting, crevice and surface corrosion. The alloy is used in valves, pumps, shafts, fittings, fastening elements and heat exchangers.

MaterialSMO® (1.4547, X1CrNiMoCuN20-18-7)
Melting point+1325 °C to +1400 °C
Application (Selection)Offshore, seawater desalination and water treatment plants, chemical industry
Suitable for (Medium)Seawater, hydrofluoric acid, sulphuric acid and alkalis