Atlas Grade datasheet 2205 rev May 2008 July 2010.

1 Grade data Sheet2205 Revised May 2008 Page 1 of the most widely used duplex(ferritic/austenitic) stainless steel Grade . Itfinds applications due to both excellentcorrosion resistance and high original S31803 composition has over theyears been refined by many steel suppliers,and the resulting restricted composition rangewas endorsed as UNS S32205 in 1996. S32205gives better guaranteed corrosion resistance,but much of the S31803 currently producedalso complies with S32205. It is recommendedthat Grade 2205 always be clarified as S31803or S32205, but note that ASTM A240 defines2205 as is not generally suitable for use attemperatures above 300 C as it suffers fromprecipitation of brittle micro-constituents, norbelow -50 C because of its ResistanceExcellent general corrosion resistance; superiorto Grade 316 in most environments. Excellentresistance to localised corrosion includingintergranular, pitting and crevice corrosion; theCPT of 2205 is generally at least 35 C.

2 Thegrade is also resistant to chloride stresscorrosion cracking (SCC) at temperatures of upto about 150 C. Grade 2205 will often performwell in environments which cause prematurefailure of austenitic grades. It has betterresistance to sea water than Grade Atlas Technical Assistance for specificenvironmental ResistanceAlthough 2205 has good high temperatureoxidation resistance this Grade , like otherduplexstainlesssteels,suffersfromem brittlement if held for even short times attemperatures above 300 C. If embrittled thiscan only be rectified by a full solutionannealing treatment. Duplex stainless steelsare almost never used above 300 TreatmentSolution treatment (annealing)Heat to 1020-1100 C and cool rapidly. Thisgrade cannot be hardened by thermaltreatment, but does work by all standard methods, but shouldnot generally be welded without filler metal asthis may result in excessive ferrite.

3 AS welding of 2205 with 2209 rods orelectrodes to ensure that deposited metal hasthe correctly balanced duplex added to the shielding gas will alsoassist in ensuring adequate austenite in thestructure. Heat input must be kept low and nopre- or post-heat should be used. The lowerco-efficient of thermal expansion of all duplexstainless steels compared with austeniticgrades reduces distortion and high strength that makes 2205 useful 20% slower than for Grade is as yet no "Ugima" ImprovedMachinability version of high strength of 2205 also makes bendingand forming more difficult; these operationswill require larger capacity equipment thanwould be required for austenitic stainlesssteels. The ductility of 2205 is less than that ofan austenitic Grade (but is not low whencompared to most other structural materials),so severe forming operations, such as coldheading, are not generally possible.

4 If severecold working is required it is recommendedthat intermediate annealing be carried ApplicationsChemical processing, transport and storage. Oiland gas exploration and processing and other high chloride & Paper digesters, liquor tanks and data Sheet2205 Revised May 2008 Page 2 of PropertiesThese properties are specified for flat rolled product (plate, sheet and coil) in ASTM A240 but not necessarily identical properties are specified for other products such as pipe andbar in their respective Specification (%)GradeCMnSiPSCrMoNiN2205(S31803) (S32205) Property SpecificationHardnessGradeTensileStrengt h(MPa)minYield Proof(MPa)minElongation(% in50mm)minRockwellC(HR C)Brinell(HB)S318036204502531 max293 maxS322056554502531 max293 maxPhysical Properties(typical values in the annealed condition)Mean Coefficient of ThermalExpansionThermalConductivityGrade Density(kg/m3)ElasticModulus(GPa)0-100 C( m/m/ C)0-315 C( m/m/ C)0-538 C( m/m/ C)at 100 C( )at 500 C( )SpecificHeat0-100 C( )ElectricalResistivity(n.)

5 M) properties of S31803 and S32205 are Specification ComparisonEuronormGradeUNSNoNoNameSwedis hSSJapaneseJIS2205S31803 / 329J3 LThese comparisons are approximate only. The list is intended as a comparison of functionally similarmaterialsnotas a schedule of contractual equivalents. If exact equivalents are needed originalspecifications must be Grade S31803 is a closer equivalent to most other specifications than is Alternative GradesGradeWhy it might be chosen instead of 2205904 LBetter formability is needed, with similar corrosion resistance and lower +2507 Higher resistance to corrosion is required, eg resistance to higher temperature super duplex grades also have higher strength than corrosion resistance is required, but with lower strength and better high corrosion resistance and strength of 2205 are not needed .. 316L is more availableand may be lower of LiabilityThe information contained in this datasheet is not an exhaustive statement of all relevant information.

6 It is a generalguide for customers to the products and services available from Atlas Steels and no representation is made or warrantygiven in relation to this document or the products or processes it describes.