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Duplex 2205 Stainless Steel for Pipe and Tube

Penn Stainless inventory includes Duplex 2205 (UNS S32205 / S31803) in tubular products. Duplex 2205 is ideally suited for high-pressure and highly corrosive environments.

General Properties

Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most popular duplex stainless steel grade. High yield strength, double that of the standard austenitic stainless steel grades, is one of its most beneficial characteristics. It also posesses good fatigue strength, as well as excellent resistance to stress corrosion cracking, crevice, pitting, erosion, and general corrosion in severe environments.

Applications:

  • Chemical processing, transport and storage – pressure vessels, tanks, piping, and heat exchangers
  • Oil and gas exploration and processing equipment – piping, tubing, and heat exchangers
  • Marine and other high chloride environments
  • Effluent scrubbing systems
  • Pulp and paper industry – digesters, bleaching equipment, and stock-handling systems
  • Cargo tanks for ships and trucks
  • Food processing equipment
  • Biofuels plants

Standards:

  • ASTM/ASME: A240 UNS S32205/S31803
  • EURONORM: 1.4462 X2CrNiMoN 22.5.3
  • AFNOR: Z3 CrNi 22.05 AZ
  • DIN: W.Nr 1.4462

Corrosion Resistance:

  • Duplex 2205 demonstrates greater corrosion resistant properties to 316 and 316L in most environments because of its high chromium, molybdenum, and nitrogen content.
  • 2205′s chromium, molybdenum, and nitrogen content also provides high resistance to pitting and crevice corrosion, even in oxidizing and acidic solutions
  • Resistant to chloride stress corrosion cracking and temperatures less than 302°F (150°C)
  • Duplex 2205 is excellent for use in caustic environments thanks to the presence of ferrite.

Heat Resistance:

  • Like other duplex stainless steels, Duplex 2205 has good oxidation resistance at high temperatures
  • Should not be used above 572°F (300°C) because it becomes subject to embrittlement when exposed to these temperatures, even for short time periods.

 

 

Welding Characteristics:

  • Good weldability
  • Should not be welded without filler metal in order to keep desired levels of ferrite

Heat Treatment:

  • Annealing temperature range is 1868 to 2012°F (1020 to 1100°C)
  • Cannot be hardened by heat treatment – but Duplex 2205 does work-harden
  • 2205 has a higher coefficient of thermal expansion, so special attention is needed to avoid warping and distortion

Processing – Hot Forming:

Most Duplex 2205 producers recommend a maximum hot forming temperature between 2010 and 2100°F (1100 to 1150°C). If the shape of the work piece is not compact, the edges may be cooler than the bulk, and which may lead to cracks.

Processing – Cold Forming:

Duplex 2205 demonstrates good formability in a variety of fabrications; however, the high strength of Duplex 2205 can pose problems. Even when the equipment has sufficient power, the grade’s higher spring back level necessitates some allowance.

Machinability:

Duplex 2205 is slightly more difficult to machine than the 300 series austenitic stainless steels. Tools used to machine 2205 will wear more qucikly, and greater cutting forces are often necessary. Some guidelines for machining are: A) Use powerful, rigid machines with extremely strong rigid mounting of tools and work piece, B) Minimize vibration by keeping the tool extension as short as possible, C) Use a nose radius on the tool, no longer than necessary, for carbides that have a sharp edge while still providing adequate strength, D) Design machining sequences to always provide for a depth of cut below the work hardened layer resulting from the previous passes.

 

Chemical Properties:

C Mn Si P S Cr Mo Ni N
2205
(S31803)
0.03
max
2.0
max
1.0
max
0.03
max
0.02
max
min: 21.0
max: 23.0
min: 2.5
max: 3.5
min: 4.5
max: 6.5
min: 0.08
max: 0.20
2205
(S32205)
0.03
max
2.0
max
1.0
max
0.03
max
0.02
max
min: 22.0
max: 23.0
min: 3.0
max: 3.5
min: 4.5
max: 6.5
min: 0.14
max: 0.20

Mechanical Properties:

Grade Tensile Strength
ksi (min)
Yield Strength
0.2% ksi (min)
Elongation % Hardness (HB) MAX
2205 90 65 25 217

Physical Properties:

Density
lbm/in3
Electrical
Resistivity
mW•in
Thermal
Conductivity
(BTU/hr•ft•°F)
Heat
Capacity
BTU/lbm•°F
Electrical
Resistivity
(in x 10-6)
at 68°F 0.278 27.6 8.7 0.112 33.5
at 212°F 26.1 9.2 0.119 35.4
at 392°F 25.4 9.8 0.127 37.4
at 572°F 24.9 10.4 0.134 39.4

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