Austenitic grade with improved oxidation resistance. Commonly used for furnace equipment (esp. supporting parts), annealing and hardening boxes, air heaters.
A common feature of GNEE high temperature steels is that they are designed primarily for use at temperatures exceeding ~550 °C, i.e. in the temperature range where creep strength as a rule is the dimensioning factor and where HT corrosion occurs. Optimising steels for high temperatures has meant that their resistance to aqueous corrosion has been limited. All steels are austenitic, resulting in relatively high creep strength values.
GNEE high temperature steels can be and have been used in a number of applications where the temperature exceeds 550°C, e.g. for equipment and components within:
Furnace equipment (esp. supporting parts)
Annealing and hardening boxes
Iron, steel, and non-ferrous industries
Energy conversion plants
Typical chemical composition is given in the table below. The chemical composition is given as % by mass.
Whilst GNEE high temperature steels are mainly optimised for oxidation and high temperature corrosion resistance, they also have good mechanical properties, partly due to their austenitic structure and partly due to certain alloying elements.
Design values are usually based on minimum proof strength values for constructions used at temperatures up to around 550°C. For higher temperatures, mean creep strength values are used.
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)
Data according to EN 10088
Modulus of elasticity
Thermal exp. at 100 °C