Aceroinoxidable----Duplex Stainless Steel Alloy 2205 (UNS S32305/S31803)
Alloy 2205 (UNS S32305/S31803) may be a twenty second Cr, third metallic element, 5-6% nickel, N alloyed duplex chrome steel with high general, localized, and stress corrosion resistance properties additionally to high strength and glorious impact toughness.
Alloy 2205 provides corroding and crevice corrosion resistance superior to 316L or 317L solid solution unblemished steels in most corrosive media. It conjointly has high corrosion and erosion fatigue properties still as lower thermal enlargement and better thermal physical phenomenon than solid solution.
General Properties
Alloy 2205 may be a twenty second Cr, third metallic element, 5-6% Nickel N alloyed duplex chrome steel with high general, localized and stress corrosion resistance properties additionally to high strength and glorious impact toughness.
Alloy 2205 provides corroding and crevice corrosion resistance superior to 316L or 317L solid solution unblemished steels in most corrosive media. It conjointly has high corrosion and erosion fatigue properties still as lower thermal enlargement and better thermal physical phenomenon than solid solution.
The yield strength is regarding doubly that of solid solution unblemished steels. this permits a designer to save lots of weight and makes the alloy a lot of value competitive compared to 316L or 317L.
Alloy 2205 is especially appropriate for applications covering the -50°F/+600°F temperature vary. Temperatures outside this vary could also be thought of however want some restrictions, notably for welded structures.
Applications
Pressure vessels, tanks, piping, and warmth exchangers within the chemical process business
Piping, tubing, and warmth exchangers for the handling of gas and oil
Effluent scouring systems
Pulp and paper business digesters, bleaching instrumentality, and stock-handling systems
Rotors, fans, shafts, and press rolls requiring combined strength and corrosion resistance
Cargo tanks for ships and trucks
Food process instrumentality
Biofuels plants
Standards
ASTM/ASME...........A240 UNS S32205/S31803
EURONORM...........1.4462 X2CrNiMoN twenty two.5.3
AFNOR...................Z3 CrNi 22.05 AZ
DIN.........................W. Nr 1.4462
Processing
Hot Forming
Forming below 600°F is suggested whenever doable. once hot forming is needed, the piece of work ought to be heated uniformly and worked within the vary of 1750 to 2250°F. Alloy 2205 is sort of soft at these temperatures and is instantly shaped. on top of this vary, 2205 is subject to hot tearing. now below this vary, the solid solution becomes considerably stronger than the primary solid solution and will cause cracking, a selected danger to “cold” edges. Below 1700°F there are often speedy formation of intermetallic phases attributable to the mixture of temperature and deformation. Whenever hot forming is completed, it ought to be followed by a full answer temper at 1900°F minimum and speedy quench to revive part balance, toughness, and corrosion resistance. Stress relieving isn't needed or recommended; but, if it should be performed, the fabric ought to receive a full answer temper at 1900°F minimum, followed by speedy cooling or water conclusion.
Cold Forming
Alloy 2205 is instantly sheared and cold shaped on instrumentality suited to operating unblemished steels. However, attributable to the high strength and speedy work hardening of 2205, forces considerably on top of those for solid solution steels ar needed to cold kind 2205. conjointly attributable to the high strength, a somewhat larger allowance should be created for springback.
Heat Treatment
Alloy 2205 ought to be treated at 1900°F minimum, followed by speedy cooling, ideally by water conclusion. This treatment applies to each answer tempering and stress relieving. Stress relief treatments at any lower temperature carry the chance of precipitation of harmful intermetallic or nonmetal phases.
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