duplex stainless steel plate
Duplex stainless steel (Duplex Stainless Steel, called DSS), refers to the ferrite and austenite each accounted for about 50% of the content is generally less phase also need to reach at least 30% of the stainless steel. In the case of containing a low C, Cr content 18% ~ 28%, Ni content of 3% to 10%. Some steel further contains Mo, Cu, Nb, Ti, N and other alloying elements.
Both austenitic class steel and ferritic stainless steel features, higher compared with ferrite, ductility, toughness, brittle at room temperature, resistance to intergranular corrosion and welding performance were significantly improved, while maintaining iron ferritic stainless steel 475 ℃ brittleness and high thermal conductivity, with superplastic characteristics. Compared with the austenitic stainless steel, high strength and resistance to intergranular corrosion and chloride stress corrosion has significantly improved. Duplex stainless steel plate has excellent resistance to pitting corrosion, but also a section of nickel stainless steel.
The first is a low-alloy, representing grades UNS S32304 (23Cr-4Ni-0.1N), the steel does not contain molybdenum, PREN value is 24-25, in terms of resistance to stress corrosion can replace AISI304 or 316 use.
The second generic type alloy, is representative of grades UNS S31803 (22Cr-5Ni-3Mo-0.15N), PREN value 32-33, the corrosion performance between AISI 316L and 6% Mo + N austenitic stainless steel between.
The third category is a high-alloy, typically containing 25% Cr, also contains molybdenum and nitrogen, and some also contain copper and tungsten, Standard Grade UNSS32550 (25Cr-6Ni-3Mo-2Cu-0.2N), PREN value 38-39 , the corrosion resistance of these steels is higher than 22% Cr duplex stainless steel.
The fourth type of generic super duplex stainless steel plate, with high molybdenum and nitrogen, Standard Grade UNS S32750 (25Cr-7Ni-3.7Mo-0.3N), and some also contain tungsten and copper, PREN value is greater than 40, suitable for harsh medium condition, has good corrosion resistance and mechanical overall performance, with comparable super austenitic stainless steel.
Jawaysteel is the original manufacturer of duplex steel products.If you have any need or inquiry about this products please do not be hesitate to visit www.jawaymetal.com.
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