DUPLEX UNS32205

ASTM A 182, A 240, A 276, 
A 789, A 790, A 815
UNS3 S31803, UNS32205
NACE MR0175

Forms of Duplex UNS32205 Available

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

UNS32205 Duplex Overview

Duplex UNS32205 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 UNS32205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, UNS32205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, UNS32205 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 UNS32205 Duplex stainless steel should be limited to temperatures below 600° F.  Extended elevated temperature exposure can embrittle UNS32205 stainless.

Corrosion Resistance

UNS32205 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 UNS32205 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 UNS32205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.

Chemical Composition, %

In what applications is Duplex UNS32205 used?

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
 

ASTM Specifications

Mechanical Properties
Specified Tensile Properties ASTM A240