UNS S31803 and S32205 denote alloys with more similarities than differences. Firstly, they are both stainless steel with identical elemental components. Both S31803 and S32205 belong to the duplex 2205 family, which implies they comprise roughly equal proportions of austenite and ferrite.
Everything you need to know about UNS S32205 and S31803
UNS S32205
Duplex UNS S32205 is a two-phase, ferritic, austenitic stainless steel alloyed with 22% chromium, 3% molybdenum, and 5 to 6% nickel. s32205 material is the most widely used grade of duplex stainless steel and is characterized by high yield strength, which doubles that of the standard austenitic stainless steel grades. s32205 stainless steel has high resistance to pitting and crevice corrosion and is excellent in most caustic environments. It also has good weldability.
S32205 duplex stainless steel Applications:
- Pulp Mills
- Food Processing
- Oil And Gas Piping
- Chemical Processing, and More.
UNS S31803
S31803 material is a duplex grade with a ferritic-austenitic microstructure. This alloy s31803 consists of around 40–50% ferrite in the annealed condition. The Duplex 2205 / F51 duplex microstructure has the high strength of the ferritic grades while maintaining the corrosion resistance of the austenitic grades.
s31803 duplex stainless steel Application:
- Fuel Gas Filters
- Chemical Tanks
- Heat Exchangers
- Acetic Acid Distillation Elements
Why Choose Grade 2205 Duplex (UNS S32205)?
The initial specification of the duplex stainless steel was set as UNS S31803. But other manufacturers constantly produced this grade and upgraded it to the highest allowed specification. UNS S32205 contains higher nitrogen content which gives it extra strength. 2205 duplex stainless steel provides an additional protective cover against any corrosive compounds. UNS S32205's heightened corrosion resistance gives it a significant distinction from UNS S31803.
