ATI 2003® (UNS S32003) lean duplex stainless steel (LDSS) is a molybdenum-enhanced, proprietary* duplex stainless steel alloy. Cr, Ni, Mo, and N are controlled to give a phase balance similar to that of ATI 2205™ duplex stainless steel, while reducing costs. The alloy fills a gap between Type 316 and the ATI 2205 alloy in terms of corrosion resistance, while possessing the higher mechanical properties characteristic of a duplex stainless steel. ATI 2003 LDSS can be an economic alternative to Type 316L stainless steel, providing enhanced strength and corrosion resistance.

When heat-treated properly ATI 2003 LDSS will have a microstructure that consists of a nearly equal mixture of the austenite and ferrite phases as shown in the image below. The microstructure and composition of ATI 2003 LDSS provide stress-corrosion cracking resistance that is superior to that of Types 316 or 317, and a yield strength that is more than double that of conventional austenitic stainless steels.

Because of its superior corrosion resistance and strength, ATI 2003 LDSS can be an economic alternative to Types 316 and 317 for a variety of applications, including:

• Pipes and Tubes

• Water Heaters

• Power Generation

• Subsea Flowlines

• Home Appliances

• Chemical Processing

• Bridge Decking

• Heat Exchangers

• Pressure Vessels

• Architectural Structures

• Water Treatment Facilities

• Transport Tanks

• Desalination

• PotableWater Systems

• Pulp & Paper Production