GENERAL INFORMATION

Fenicro®20 is Ni-Fe-Cr alloy with the low content of carbon, with the alloying additive of copper and molybdenum, austenitic stabilized by niobium.

Main characteristics Fenicro®20:

• excellent sulfuric and phosphoric acids resistance.
• good resistance of intercrystalline corrosion.
• very good resistance to the corrosion cracking caused by chlorine ions.
• resistance to pitting and crevice corrosion.
• good mechanical properties, both at room, and at the high temperatures approximately up to 500°С (930°F).

Application area

Fenicro®20 is widely used at temperatures up to 500°С (930°F).

Typical fields of operation:

•the equipment for production of sulfuric acid and also the processes which are based on use of sulfuric acid.

•extraction columns in production of amino acids and for production of medications.

•production of synthetic and plastic fibers

•equipment for production of food

Ppocessing and heat treatment

Fenicro®20 it is convenient in the course of deformation in heated condition, as well as in cold, it is well processed by cutting and weld well

Cold deformation

Cold deformation is carried out in the annealed condition.

Fenicro®20 shows higher rates of cold hardening, than austenitic stainless steels that has to be considered at the choice of the form-building device.

At cold deformation with high reduction ratio it is necessary to apply intermediate annealing.

At cold deformation from 15% of reduction ratio the final stabilizing annealing has to be carried out.

Heat treatment

The softening or stabilizing annealing has to be carried out at temperatures 920°С-960°С (1690-1760°F) , preferably at 950°С (1740°F).

For achievement of the maximal corrosion resistance the subsequent hardening in water is obligatory. At a thickness of product less than 3 mm the accelerated cooling on air can be carried out. Stress relieving annealing is carried out at 540°С (1000 °F).

At each heat treatment the ordered requirements of purity have to be observed.