JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
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Duplex S31803 Stainless Steel Cold Drawn Steel Bar With En 1.4462
2205 Duplex Overview
Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat
common corrosion problems encountered with the 300 series stainless steels. “Duplex”
describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor
purely ferritic, like 430 stainless. The structure of 2205 duplex stainless steel consists of
austenite pools surrounded by a continuous ferrite phase. In the annealed 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 family of stainless steels.
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 those of an austenitic alloy
(ease of fabrication and corrosion resistance).
Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F.
Extended elevated temperature exposure can embrittle 2205 stainless.
Corrosion Resistance
2205 duplex stainless steel is a cost effective solution for many applications where the 300
series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion
cracking occurs when stainless steels are subjected to tensile stress, while in contact with
solutions containing chlorides. Increasing temperatures also increase the susceptibility of
stainless steels to stress corrosion cracking.
The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205
to chloride pitting and crevice corrosion. This resistance is extremely important for services
such as marine environments, brackish water, bleaching operations, closed loop water systems
and some food processing applications. The high chromium, molybdenum and nitrogen contents
of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L
in most environments.
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 |
In what applications is Duplex 2205 used?
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 |
1) Size and type:
Hexagon Bolt: M6-M64 full thread or half thread
Hexagon Nut: M3-M64
Threaded Rod:4-2000mm
Plain washers:M3-M64
And heavy hex bolts and nuts with all sizes
2) Treatment: cold forging
Super duplex stainless steel F55, F51, F53 HastelloyB & C, Inconel, Incoloy etc.
2. Standards: GB, DIN, JIS, AISI/ASTM/ANSI/AMSE and BS EN, etc.
3. Packing: Cartons then pallet, or wooden box, or by clients' requirements.
4. Exported countries: United States, Germany, Saudi Arabia, South Korea, etc.
5. factory price, accept small order and short delivery time1
