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  • Shaanxi Tonghui Steel Co., Ltd.

  • E-mail: sxthsteel@sxth-group.com

  • Tel: +86-29-89636557

  • Add: 1st Building Of Jinqiao International, Xi'an, Shaanxi,China

  • How much do you know about duplex stainless steel? (2)
    Aug 10, 2018

    ( Following from previous page... )

    Duplex stainless steel has the following characteristics:

    1). molybdenum containing duplex stainless steel has good chloride stress corrosion resistance under low stress. Generally 18-8 type austenitic stainless steel is prone to stress corrosion cracking in neutral chloride solution above 60 degrees C. Heat exchangers and evaporators made of this kind of stainless steel in trace chloride and hydrogen sulfide industrial medium have a tendency to produce stress corrosion cracking, while duplex stainless steel has a good resistance energy. Power.

    2). molybdenum containing duplex stainless steel has good pitting resistance. The critical pitting corrosion potential of duplex stainless steel is similar to that of austenitic stainless steel with the same equivalent pitting resistance (PRE = Cr% + 3.3Mo% + 16N%). The pitting corrosion resistance of duplex stainless steel and austenitic stainless steel is similar to that of AISI 316L. The pitting corrosion resistance and crevice corrosion resistance of high chromium duplex stainless steel containing 25% Cr, especially nitrogen, exceeded AISI 316L.

    stainless steel pipe/bar/sheet/coil

    3). good corrosion resistance and wear corrosion resistance. Under certain corrosive medium conditions, it is suitable for making power equipment such as pumps and valves.

    4). good mechanical properties. It has higher strength and fatigue strength and yield strength is 2 times of that of type 18-8 austenitic stainless steel. The elongation of solid solution reaches 25%, and the toughness value AK (V notch) is above 100J.

    5). Good weldability, small tendency of hot cracking, generally no preheating before welding, no heat treatment after welding, and 18-8 austenitic stainless steel or carbon steel can be dissimilar welding.

    ( To be continued ...)

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