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U-bolt DIN3570 fastenersduplex 2205 U-bolt

In addition to good corrosion resistance and high tensile strength, Duplex 2205 Hex Bolts also have high surface toughness. This and the passive oxide layer formed by the addition of chromium is the reason why 2205 duplex stainless steel fasteners are used in the marine industry.

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UNS S31803 is a typical duplex stainless steel and is very similar to UNS S32205 except that it may have slightly lower requirements for chromium, molybdenum and nitrogen. In general, both UNS 31803 and S32205 can be referred to as “Duplex 2205” in practice. Meanwhile, UNS S32205 or DIN W.Nr. 1.4462, Duplex 2205 is an austenitic and ferritic two-phase Cr-Mo-Ni alloy stainless steel with a roughly mixed 1:1 ferritic and austenitic structure . It is the most widely used duplex grade and is characterized by a high yield strength that is twice that of standard austenitic grades.

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