Overview

Grade S32205 is similar with S31803, both featured with structure of two phases (α and γ) and has characteristics of both ferritic and austenitic stainless steel. It has good corrosion resistance and high strength. It is alloyed with 18%-28% Cr and 3%-10% Ni in the condition of low C. Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc.

Comparing with ferritic stainless, duplex stainless steel has higher plasticity, ductility and better intergranular corrosion resistance and weldability. It keeps same 475℃ brittleness with ferritic stainless and high thermal conductivity. Duplex has improved yield strength, resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion & corrosion compared with austenitic stainless steel.

ASTM A789 S32205 is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed Duplex Stainless Steel Tube with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness. It provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel tube 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
 

ASTM A789/A789M-20 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service.

Chemical Composition

Mechanical Properties

Applications

• 1. Chemical Processing, Transport and Storage

• 2. Oil and Gas Exploration and Offshore Rigs

• 3. Mil and Gas Refining

• 4. Marine Environments

• 5. Pollution Control Equipment

• 6. Pulp & Paper Manufacturing

• 7. Chemical Process Plant