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Duplex Stainless Steel 329
One of the earliest duplex steel which is reflected in its higher permitted carbon content. Its resistance to pitting (PREN about 32) and to crevice corrosion is below that of super duplex steels, therefore use in seawater is limited. Exposure to moderate and high temperature and less rapid cooling may cause embrittlement. Accordingly, design stress values in ASME II do not extend above 260°C for S32900. Impact values are high at room temperature. However, the proportion and orientation of ferrite in welds and base material may significantly affect toughness at subzero temperatures.
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Super Duplex Stainless Steel
Super duplex stainless steel is a subgroup of duplex stainless steels that has a higher alloy content, especially in chromium, molybdenum, and nitrogen. It has a microstructure made up of both austenitic and ferritic grains of steel.
Super Duplex Stainless Steel is more corrosion resistant and has higher mechanical strength than other stainless steels. It’s also known for its high strength and excellent corrosion resistance
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Duplex Stainless Steel 31803
Duplex stainless steel – F51 / S31803 / S32205/ 1.4462
UNS S31803 and UNS S32205 are commonly referred to as Duplex 2205® material, whose “Duplex” name is derived from the mixed micro structure which contains about equal portions of ferrite and austenite. Developed more than 70 years ago in Sweden precisely for the sulfite paper industry where the Duplex’s were used to combat corrosion problems caused by chloride-bearing cooling waters and other aggressive chemical products. Since then there have been advancements in the composition such as the deliberate addition of nitrogen as an alloying agent, which afterwards quickly made Duplex the “workhorse” of stainless steels.
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