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Alloy 33

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Alloy Composition of Alloy 33
 
Chromium (Cr)31 to 35 %
Iron (Fe)25.7 to 37.9 %
Nickel (Ni)30 to 33 %
Molybdenum (Mo)0.5 to 2.0 %
Manganese (Mn)0 to 2.0 %
Copper (Cu)0.3 to 1.2 %
Nitrogen (N)0.35 to 0.6 %
Silicon (Si)0 to 0.5 %
Phosphorus (P)0 to 0.020 %
Carbon (C)0 to 0.015 %
Sulfur (S)0 to 0.010 %

 Alloy 33 is a high-chromium austenitic alloy  This alloy combines ease of fabrication with outstanding resistance to highly oxidizing media such as 
 
concentrated sulphuric acid. Despite its low molybdenum content, it shows excellent resistance to localized
corrosion in halide media. The nitrogen content ensures high mechanical properties with good ductility.
 Alloy 33 is characterized by:
 outstanding resistance to strongly oxidizing media
 excellent resistance to localized corrosion in halide solutions
 
excellent resistance to nitric/hydrofluoric acid mixtures
excellent resistance to caustic soda
high strength and toughness
ease of fabrication
good weldability
good metallurgical stability
approved authorization for pressure vessel use in the temperature range -196 to 450 °C (-320 to 840 °F).
 
The newly developed austenitic material alloy 33  has an extremely high chromium content of 33 %, which forms the basis of its resistance to corrosion in oxidizing media.The small amount of added molybdenum improves its resistance in phosphoric acid, and the copper content facilitates passivation in sulphuric acid.Besides excellent resistance to nitric-hydrofluoric acid mixtures, this alloy also has an outstanding resistance to corrosion by alkaline media.Its resistance to pitting and crevice corrosion in chloride media and to chloride-induced stress-corrosion cracking is also outstanding.Optimum corrosion resistance can only be ensured if the material is in clean, bright condition when used.
 
Applications
Typical applications for Alloy 33 are:
sulphuric acid production plant
sulphuric acid heat recovery and distribution systems
nitric-hydrofluoric acid pickling plant
seawater systems
plate or tubular heat exchangers using brackish or
seawater as coolant
bleaching plant for chemical pulp
 
 


Alloy 33