UNS S31803/S32205 Duplex Steel Stainless Steel Coil 3.0*1500*Coil
Duplex Steel Composition
UNS S31803/S32205 Duplex Steel Stainless Steel Coil 5.0*1500*Coil
We has an extensive inventory of 2205 duplex stainless steel plate
in thicknesses from 3/16" (4.8mm) through 6" (152.4mm). The yield
strength is about twice that of austenitic stainless steels, thus
allowing a designer to save weight and making the alloy more cost
competitive when compared to 316L or 317L.
Available thicknesses for Alloy 2205:
| 3/16" | 1/4" | 5/16" | 3/8" | 1/2" | 5/8" | 3/4" | 7/8" | 1" | 1 1/8" | 1 1/4" | 1 3/8" | 1 1/2" |
|---|
| 4.8mm | 6.3mm | 7.9mm | 9.5mm | 12.7mm | 15.9mm | 19mm | 22.2mm | 25.4mm | 28.6mm | 31.8mm | 34.9mm | 38.1mm |
|
| 1 5/8" | 1 3/4" | 2" | 2 1/4" | 2 1/2" | 2 3/4" | 3" | 3 1/4" | 3 1/2" | 4" | 5" | 6" |
|---|
| 41.3mm | 44.5mm | 50.8mm | 57.2mm | 63.5mm | 69.9mm | 76.2mm | 82.6mm | 88.9mm | 101.6mm | 127mm | 152.4mm |
Alloy 2205 (UNS S32305/S31803) is a 22% chromium, 3% molybdenum,
5-6% nickel, nitrogen alloyed duplex stainless steel plate with
high general, localized, and stress corrosion resistance properties
in addition to high strength and excellent impact toughness.
Alloy 2205 duplex stainless steel plate provides pitting and
crevice corrosion resistance superior to 316L or 317L austenitic
stainless steels 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.
Specification Sheet Overview
for Alloy 2205 (UNS S32205/S31803)
A 22Cr-3Mo Stainless Steel:
General Properties
Alloy 2205 duplex stainless steel plate is a 22% Chromium, 3%
Molybdenum, 5-6% Nickel nitrogen alloyed duplex stainless steel
plate with high general, localized and stress corrosion resistance
properties in addition to high strength and excellent impact
toughness.
Alloy 2205 duplex stainless steel plate provides pitting and
crevice corrosion resistance superior to 316L or 317L austenitic
stainless steels 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 yield strength is about twice that of austenitic stainless
steels. This allows a designer to save weight and makes the alloy
more cost competitive when compared to 316L or 317L.
Alloy 2205 duplex stainless steel plate is particularly suitable
for applications covering the -50°F/+600°F temperature range.
Temperatures outside this range may be considered but need some
restrictions, particularly for welded structures.
Applications
- Pressure vessels, tanks, piping, and heat exchangers in the
chemical processing industry
- Piping, tubing, and heat exchangers for the handling of gas and oil
- Effluent scrubbing systems
- Pulp and paper industry digesters, bleaching equipment, and
stock-handling systems
- Rotors, fans, shafts, and press rolls requiring combined strength
and corrosion resistance
- 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 1.4462Corrosion Resistance
General Corrosion
Because of its high chromium (22%), molybdenum (3%), and nitrogen
(0.18%) contents, the corrosion resistance properties of 2205
duplex stainless steel plate are superior to that of 316L or 317L
in most environments.
Localized Corrosion Resistance
The chromium, molybdenum, and nitrogen in 2205 duplex stainless
steel plate also provide excellent resistance to pitting and
crevice corrosion even in very oxidizing and acidic solutions.
Isocorrosion Curves 4 mpy (0.1 mm/yr), in sulfuric acid solution
containing 2000 ppm
Stress Corrosion Resistance
The duplex microstructure is known to improve the stress corrosion
cracking resistance of stainless steels.
Chloride stress corrosion cracking of austenitic stainless steels
can occur when the necessary conditions of temperature, tensile
stress, oxygen, and chlorides are present. Since these conditions
are not easily controlled, stress corrosion cracking has often been
a barrier to utilizing 304L, 316L, or 317L.
Corrosion Fatigue Resistence
Alloy 2205 duplex stainless steel plate combines high strength and
high corrosion resistance to produce high corrosion fatigue
strength. Applications in which processing equipment is subject to
both an aggresively corrosive enviroment and to cycle loading can
benefit from the properties of 2205 duplex stainless steel plate.
Critical Pitting Temperature in 1M NaCl Measured using the
Outokumpu Stainless, Inc Pitting Cell
Critical Crevice Corrosion Temperature (CCT) in 10% FeCl3•6H2O
General Corrosion in Wet Process Phosphoric Acids
| Corrosion Rate, ipy |
|---|
| Grade | Solution A, 1401/4F | Solution B, 1201/4F |
|---|
| 2205 | 3.1 | 3.9 |
| 316L | >200 | >200 |
| 904L | 47 | 6.3 |
| Composition, wt% |
|---|
| P2O5 | HCl | HF | H2SO4 | Fe2O3 | Al203 | SiO2 | CaO | MgO |
| Sol A 54.0 | 0.06 | 1.1 | 4.1 | 0.27 | 0.17 | 0.10 | 0.20 | 0.70 |
| Sol B 27.5 | 0.34 | 1.3 | 1.72 | 0.4 | 0.001 | 0.3 | 0.02 | — |
Stress Corrosion Cracking Resistance
| Boiling | Wick | Boiling |
|---|
| Grade | 42% MgCl2 | Test | 25% NaCl |
|---|
| 2205 | F | P | P |
| 254 SMO® | F | P | P |
| Type 316L | F | F | F |
| Type 317L | F | F | F |
| Alloy 904L | F | P or F | P or F |
| Alloy 20 | F | P | P |
(P = Pass, F = Fail)
Chemical Analysis
Typical Values (Weight %)
| Carbon | Chromium | Nickel | Molybdenum | Nitrogen | Others |
|---|
| 0.020 | 22.1 | 5.6 | 3.1 | 0.18 | S=0.001 |
| PREN = [Cr%] = 3.3 [Mo%] = 16 [N%] ≥ 34 |
Mechanical Properties
Mechanical Properties at Room Temperature
| ASTM A 240 | Typical |
|---|
| Yield Strength 0.2%, ksi | 65 min. | 74 |
| Tensile Strength, ksi | 90 min. | 105 |
| Elongation, % | 25 min. | 30 |
| Hardness RC | 32 max. | 19 |
Tensile Properties at Elevated Temperatures
| Temperature °F | 122 | 212 | 392 | 572 |
|---|
| Yield Strength 0.2%, ksi | 60 | 52 | 45 | 41 |
| Tensile Strength, ksi | 96 | 90 | 83 | 81 |
Physical Properties
| Temperature °F | | 68 | 212 | 392 | 572 |
|---|
| Density | lb/in3 | 0.278 | — | — | — |
| Modulus of Elasticity | psi x 106 | 27.6 | 26.1 | 25.4 | 24.9 |
| Linear Expansion (68°F-T) | 10-6/°F | — | 7.5 | 7.8 | 8.1 |
| Thermal Conductivity | Btu/h ft°F | 8.7 | 9.2 | 9.8 | 10.4 |
| Heat Capacity | Btu/lb ft°F | 0.112 | 0.119 | 0.127 | 0.134 |
| Electrical Resistivity | Ωin x 10-6 | 33.5 | 35.4 | 37.4 | 39.4 |
Structure
The chemical analysis of 2205 duplex stainless steel plate is
optimized to obtain a typical 50 a/ 50 g microstructure after
solution annealing treatment at 1900°/1922°F (1040°/1080°C).
Chloride Pitting Resistance
The pitting resistance of an austenitic stainless steel can be
related directly to alloy composition, where chromium, molybdenum
and nitrogen are a weight %. The Pitting Resistance Equivalent
Number (PREN) uses the following formula to measure an alloy's
relative pitting resistance - the higher the number, the better the
pitting resistance.
Processing
Hot Forming
Forming below 600°F is recommended whenever possible. When hot
forming is required, the workpiece should be heated uniformly and
worked in the range of 1750 to 2250°F. Alloy 2205 duplex stainless
steel plate is quite soft at these temperatures and is readily
formed. Above this range, 2205 is subject to hot tearing.
Immediately below this range, the austenite becomes substantially
stronger than the ferrite and may cause cracking, a particular
danger to “cold” edges. Below 1700°F there can be rapid formation
of intermetallic phases because of the combination of temperature
and deformation. Whenever hot forming is done, it should be
followed by a full solution anneal at 1900°F minimum and rapid
quench to restore phase balance, toughness, and corrosion
resistance. Stress relieving is not required or recommended;
however, if it must be performed, the material should receive a
full solution anneal at 1900°F minimum, followed by rapid cooling
or water quenching.
Cold Forming
Alloy 2205 duplex stainless steel plate is readily sheared and cold
formed on equipment suited to working stainless steels. However,
because of the high strength and rapid work hardening of 2205
duplex stainless steel plate, forces substantially higher than
those for austenitic steels are required to cold form it. Also
because of the high strength, a somewhat larger allowance must be
made for springback.
Heat Treatment
Alloy 2205 duplex stainless steel plate should be annealed at
1900°F minimum, followed by rapid cooling, ideally by water
quenching. This treatment applies to both solution annealing and
stress relieving. Stress relief treatments at any lower temperature
carry the risk of precipitation of detrimental intermetallic or
nonmetallic phases.
Machinability
With high-speed steel tooling, 2205 duplex stainless steel plate
may be machined at the same feeds and speeds as Alloy 316L. When
carbide tooling is used, cutting speeds should be reduced by about
20% relative to the speeds for Alloy 316L. Powerful machines and
rigid mounting of tools and parts are essential.
Welding
Alloy 2205 duplex stainless steel plate possesses good weldability.
The goal of welding 2205 is that the weld metal and heat-affected
zone (HAZ) retain the corrosion resistance, strength, and toughness
of the base metal. The welding of 2205 is not difficult, but it is
necessary to design welding procedures that lead to a favorable
phase balance after welding and will avoid precipitation of
detrimental intermetallic or nonmetallic phases.
Alloy 2205 duplex stainless steel plate can be welded by: GTAW
(TIG); GMAW (MIG); SMAW ("stick" electrode); SAW; FCW; and PAW.
2205 Code Plus Two and 254 SMO are registered trademarks of
Outokumpu Stainless, Inc.
