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Alloy 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.

Alloy 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 a ferritic alloy stress corrosion cracking resistance and high strength with austenitic alloy ease of fabrication and corrosion resistance.

Duplex 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, 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 2205 Duplex stainless steel should be limited to temperatures below 600° F.  Extended elevated temperature exposure can embrittle 2205 stainless.



1.4462 Composition % according to EN-10216-5:

C Si Mn P S Cr Mo Ni N Cu
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:

C Si Mn P S Cr Mo Ni N Cu
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:

C Si Mn P S Cr Mo Ni N Cu
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 -


General Properties
Application
Standards
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Structure
Welding
Processing
Machinability
Difference Between Duplex Steel S31803/S32205 and 316L




ASTM A789/A789M
ASTM A 790/A 790M
Duplex Stainless Steel Pipe
Austenitic-Ferritic Stainless Steel Pipe
Super-Duplex Stainless Steels and their characteristics
2507 S32750(1.4410) Duplex Steel
S32205 S31803(1.4462) Duplex Steel
S32304(1.4362) Duplex Steel
Compared with the ferritic stainless steel, duplex stainless steel vulnerable
Compared with the austenitic stainless steel, duplex stainless steel strengths and vulnerable

Duplex 2205 Product Information
Products OD Wall Lengths and/or coils Grades OD Wall Lengths
Welded Austenitic Steel Boiler, Super Heater, Heat-Exchangers & Condenser Tubes Specifications: ASTM-A789 and ASTM-A790 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)

Physical Properties of Duplex 2205 Alloys in the Annealed Condition at -20°F to +100°F

      Tensile Strength Yield Strength            
Alloy UNS Designation Spec. psi MPa ksi psi MPa ksi Elongation in 2 in. (min.) % Grain Size Req. 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,
30* Rc
27.5 7.6 180
Duplex 2205 S31803 A789, A790 90,000 620 95 65,000 450 70 30 28 Rc,
30* Rc
27.5 7.6 180

*OD over 1.0" TS>87, YS>58, no hardness requirement 1.0" OD and under

Duplex 2205 Product Range

Alloy UNS Designation Werkstoff NR. Specifications*
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.