ASTM A 182, A 240, A 276, A 789, A 790, A 815 UNS S31803, S32205 NACE MR0175
Forms of Duplex 2205 stainless steel:
Sheet
Plate
Bar
Pipe & Tube (welded & seamless)
Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
Welding Wire and Welding Electrode
General Properties
Alloy 2205 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 2205 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 is particularly suitable for applications covering the -50F/+600F temperature range. Temperatures outside this range may be considered but need some restrictions, particularly for welded structures.
Chemical Composition, %
Cr |
Ni |
Mo |
C |
N |
22.0-23.0 |
4.50-6.50 |
3.00-3.50 |
.030 Max |
0.14-0.20 |
Mn |
Si |
P |
S |
Fe |
2.00 Max |
1.00 Max |
.030 Max |
.020 Max |
Balance |
ASTM Specifications
Pipe Smls |
Pipe Welded |
Tube Smls |
Tube Welded |
Sheet/Plate |
Bar |
Flanges, Fittings & Valves |
A790 |
A790 |
A789 |
A789 |
A240 |
A276 |
A182 |
Mechanical Properties Specified Tensile Properties ASTM A240
Ultimate Tensile Strength, ksi Minimum |
.2% Yield Strength, ksi Minimum |
Hardness Max. |
95 |
65 |
31 Rockwell C |
Applications of Duplex 2205:
Chemical process vessels, piping and heat exchangers Pulp mill digesters, bleach washers, chip pre-steaming vessels Food processing equipment Oil field piping and heat exchangers Flue gas desulfurization equipment
Shanghai Yikai Metal Products Co., Ltd Steel supplier in Shanghai, China
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