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Alloy S31803 and Alloy S32205 Duplex Stainless Steel

Alloy S31803 and Alloy S32205 Duplex Stainless Steel

Alloy S31803 and Alloy S32205 Duplex Stainless Steel

Dual-phase or duplex stainless steel whose grain structure is ferritic and austenitic.

Applications

Alloy S31803 and Alloy S32205 Stainless Steel is used most often in heat exchangers, marine construction, oil and gas industry, chemical processing.

Properties

Alloy S31803 and S32205 stainless steel is a dual-phase stainless steel whose grain structure is ferritic and austenitic, hence the name “duplex”. With twice the mechanical strength and corrosion resistance of common austenitics, alloy S31803 and S32205 stainless steel offers some advantages over 316L and 317L:

  • Lower coefficient of thermal expansion and a higher thermal conductivity
  • Resists chloride stress corrosion cracking
  • Pitting and crevice corrosion resistance
  • Excellent choice for high chloride environments
  • Lower cost than high alloyed austenitic

Excellent general corrosion resistance; superior to Grade 316 steel in most environments. Excellent resistance to localized corrosion including inter granular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35ºC. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150ºC. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water then Grade 316.

Type Sizes Schedules ASTM Standards
Bar A276, A479
Butt Weld Fittings 1/2″ thru 12″ Sch 10, 40, 80, 160 A815
Forgings 1/2″ thru 12″ WN, SO, & BO Flanges A182
Pipe Welded & Seamless 1/4″ thru 16″ Sch 10, 40, 80, 160 A790
Tube, Welded A789
Plate A240
Notice: 2205 and duplex 2205 are ambiguous trade names referring to either S31803 or S32205.