UNS S31803 is duplex stainless steel that is also commonly known as 2205 stainless steel. It is a widely used material in various industries due to its excellent combination of corrosion resistance, high strength, and good weldability.
The UNS (Unified Numbering System) designation S31803 indicates the composition and properties of the steel. The “S” stands for stainless steel, and the number “31803” refers to the specific alloy composition. In this case, it signifies a duplex stainless steel containing approximately 22% chromium, 5-6% nickel, 3% molybdenum, and a balanced amount of iron.
Duplex stainless steels like UNS S31803 Pipe exhibit a microstructure consisting of both austenite and ferrite phases, which contributes to their unique properties. They offer improved resistance to various forms of corrosion, including pitting, crevice corrosion, and stress corrosion cracking, compared to conventional austenitic stainless steel.
In summary, UNS S31803 is equivalent to 2205 stainless steel, and it is widely used in industries such as oil and gas, chemical processing, marine, and many others where a combination of high strength and excellent corrosion resistance is required.
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