Super Duplex A790/A789 Erw Pipe

Corrosion Resistance

Super Duplex A790/A789 Erw Pipe 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.

In what applications is Duplex 2205 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