2205 (UNS S32205)

2205 Duplex Stainless Steel
UNS S32205

Introduction

Duplex stainless steel 2205 (UNS S32205) is the most widely used duplex (ferritic/austenitic)

stainless steel grade. When heat treated properly, nearly equal proportions of austenite and ferrite exist,which ensures that 2205 (UNS S32205) is much more resistant to stress corrosion cracking than other 304 or 316L. It is recommended that grade 2205 always be clarified as S31803 or S32205, but note that ASTM A240 defines2205 as S32205., and 2205 is the most widely used grade in the duplex family of stainless steels.

Properties
2205 (UNS S32205) is of  high general, localized and stress corrosion resistance properties in addition to high strength and excellent impact toughness.2205 (UNS S32205) provides pitting and crevice corrosion resistance superior to other austenitic stainless steels in almost all corrosion media. It also has high corrosion and erosion fatigue pro perties as well as lower thermal expansion and higher thermalconductivity than austenitic steels.

Chemical Composition of 2205 (UNS S32205) (%)
Cr                      Ni                  Mo               C                  N
22.0-23.0      4.50-6.50       3.00-3.50    .030 Max     0.14-0.20
Mn                     Si                   P                 S                  Fe
2.00 Max      1.00 Max         .030 Max      .020 Max       Balance

Application
The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).Because of its  special structure, the yield strength of 2205 is about twice as that of austenitic stainless steels, and 2205 (UNS S32205) is particularly suitable for applications covering the temperature
range of -45°C to 320°C.Below are the applications 2205 are used for:
• chemical process vessels, piping and heat exchangers
• pulp mill digesters, bleach washers, chip pre-steaming vessels
• food processing equipment
• oil field piping and heat exchangers
• flue gas desulfurization equipment

Please contact our company service (hotline:86 0510-83,632,628) to get more information on 2205 (UNS S32205) about selection, application, heat treatment and inventory and other related information,you can also contact us for more information about  duplex stainless steel and  stainless steel.
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