UNS S31803 / S32205 Duplex Steel Stainless Steel Coils 0.5 - 14mm Thickness

Duplex 2205 stainless steel (both ferritic and austenitic) is used extensively in applications that require good corrosion resistance and strength. The S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade offers higher resistance to corrosion.

At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation, and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition; hence this grade of stainless steel is not suitable for use at these temperatures.

Duplex 2205, also known as UNS S32205, is a nitrogen-enhanced stainless steel. Users choose Duplex 2205 for its excellent corrosion resistance along with its high strength. It is important to note that Duplex 2205, offers much higher levels of corrosion resistance than most other austenitic stainless steels. Other benefits include:

• High resistance to pitting and crevice corrosion
• Excellent in most caustic environments
• Good weldability

Compositional ranges for grade 2205 duplex stainless steel.

Mechanical Properties of duplex 2205 stainless steel

The typical mechanical properties of grade 2205 stainless steels are listed in the table below. Grade S31803 has similar mechanical properties to that of S32205. 

Grade Specification Comparison

Table 4 provides the grade comparison for 2205 stainless steels. The values are a comparison of functionally similar materials. Exact equivalents may be obtained from the original specifications.

This unique mix of materials makes Duplex 2205 the right choice for a number of different critical applications in a range of industries, including:

• Chemical processing, transport, and storage
• Marine and Land cargo tanks
• Biofuel production
• Food processing
• Pulp and Paper manufacturing
• Oil and gas exploration and processing
• Waste management
• High chloride environments