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UNS R20033
We are professional UNS R20033 Forged forging Steel Round Bars Rods Square rectangular rectangle Flat Hex Bars,UNS R20033 Forged Forging Steel Hollow Bars Forged Forging Sleeves Bushes Bushing Pipes Piping tubes tubings barrels Casing Cases Shells cylinders hubs housings,UNS R20033 Forged Forging Steel Rings Seamless Rolled Steel Rings,UNS R20033 Forged Forging Steel Flanges Blocks Discs Disks Plates,and other UNS R20033 forged forging forge Steel parts forged forging pieces forged forging steel components material products from china
Alloy Composition of UNS R20033
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 %
UNS R20033 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.
UNS R20033 is characterized by:
outstanding resistance to strongly oxidizing media
excellent resistance to localized corrosion in halide solutions
¡ñ excellent resistance to nitric/hydrofluoric acid mixtures
¡ñ excellent resistance to caustic soda
¡ñ high strength and toughness
¡ñ ease of fabrication
¡ñ good weldability
¡ñ good metallurgical stability
¡ñ approved authorization for pressure vessel use in the temperature range -196 to 450 °C (-320 to 840 °F).
The newly developed austenitic material UNS R20033 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 UNS R20033 are:
¡ñ sulphuric acid production plant
¡ñ sulphuric acid heat recovery and distribution systems
¡ñ nitric-hydrofluoric acid pickling plant
¡ñ seawater systems
¡ñ plate or tubular heat exchangers using brackish or
seawater as coolant
¡ñ bleaching plant for chemical pulp