Duplex Stainless Steel 2205 S32205 S31803 is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.
Duplex Stainless Steel 2205 S32205 S31803 provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.The advantage of a duplex structure is that it combines the favorable qualities of aferritic alloy stress corrosion cracking resistance and high strength with austenitic alloy ease of fabrication and corrosion resistance.
Duplex Stainless Steel 2205 S32205 S31803 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steel. “Duplex” describes a family of stainless steel that are neither fully austenitic, like 304 stainless steel, nor purely ferritic, like 430 stainless steel. The structure of 2205 duplex stainless steel consists of austenitic pools surrounded by a continuous ferritic phase. In the annealing condition, 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex stainless steel tube.
Usage of Duplex stainless steel 2205 should be limited to temperatures below 600° F. Extended elevated temperatureexposure can embrittle 2205 stainless.
1.4462 Composition % according to EN-10216-5:
|max. 0,03||max. 1,00||max. 2,00||max. 0,035||max. 0,015||21,00 - 23,00||2,50 - 3,50||4,50 - 6,50||0,10-0,22||-|
S32205 Composition % according to ASTM A789 ASTM A790:
|max. 0,03||max. 1,00||max. 2,00||max. 0,030||max. 0,020||22,00 - 23,00||3,0 - 3,5||4,5 - 6,50||0,14-0,20||-|
S31803 Composition % according to ASTM A789 ASTM A790:
|max. 0,03||max. 1,00||max. 2,00||max. 0,030||max. 0,020||21,00 - 23,00||2,5 - 3,5||4,50 - 6,50||0,08-0,20||-|
Resistance to Corrosion
|Products||OD||Wall||Lengths and/or coils||Grades||OD||Wall||Lengths|
|3/16" (4.76 mm) to 4" (101.6 mm)Metric sizes available||0.020" (0.51 mm) to 0.220" (5.59 mm)||Random or cut lengths up to 68' (20.7 m) Coils to 1-1/2" OD||Duplex 2205||
<1-1/2" (38.1 mm) ±0.005" (0.13 mm)
1-1/2" (38.1 mm) to 3" (76.2 mm) ±0.010" (0.25 mm)
3-1/2" (88.9 mm) to 4" (101.6 mm) ±0.015" (0.38 mm)
|±10%||Randoms up to +2" (50.8 mm) Cuts +1/8" (3 mm) -0"
Coils to 80,000' (24,384 m)
|Tensile Strength||Yield Strength|
|Alloy||UNS Designation||Spec.||psi||MPa||ksi||psi||MPa||ksi||Elongation in 2 in. (min.) %||Grain SizeReq.||Max. Hardness||Modulus of Elasticity(x106 psi)||Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6)||Thermal Conductivity (BTU-in/ ft2-h-°F)|
|Duplex 2205||S32205||A789,A790||95,000||655||95||70,000||485||70||30||—||28 Rc,
|Duplex 2205||S31803||A789, A790||90,000||620||95||65,000||450||70||30||—||28 Rc,
*OD over 1.0" TS>87, YS>58, no hardness requirement 1.0" OD and under
|Alloy||UNS Designation||Werkstoff NR.||Specifications*|
|Duplex 2205||S31803/S32205||1.4462||A/SA789, A/SA790|
*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.
Source: Yaang Pipe Industry Co., Limited (www.yaang.com)