Duplex Steel Plate 31803
Duplex 31803 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 31803 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 31803 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 31803 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 31803 Duplex stainless steel should be limited to temperatures below 600° F. Extended elevated temperature exposure can embrittle 31803 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 31803 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 |
Characteristics of Duplex 31803
Applications of Duplex 31803
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
| .2% Yield Strength, ksi Minimum | Hardness Max. |
95 | 65 | 31 Rockwell C |
COUNTRY | USA | USA |
| FRANCE | EUROPEAN |
| JAPAN |
STANDARDS | ASTM | UNS | NACE | AFNOR | EN | ISO | JIS |
GRADE | A182 A240 A276 A789 A790 A815 | S31803 S32205 | MR0175 | Z3CrNi 22.05 AZ | 1.4462 | 4462-318-03-I | SUS 329J3L |
COUNTRY | SWEDEN | CHINA | KOREA | GERMANY | USA |
STANDARDS | SS | GB | KS | DIN | AISI |
GRADE | 2377 | 00Cr22Ni5Mo3N | STS 329J3L | X2CrNiMoN22.5.3 | F51/ F60 (A182) |
COUNTRY | ||
STANDARDS | BS (WROUGHT) | SS (CAST) |
GRADE | 318S13 | 332C15 |
![]() |
CONQUEST STEEL & ALLOYS
All Rights Reserved.(Terms of Use) Developed and Managed by Infocom Network Ltd. |