• Reduce Sulfide Stress Cracking (SSC)

    Description

    Sulfide Stress Cracking (SSC) is a form of hydrogen stress cracking and involves the embrittlement of the metal by atomic hydrogen that is produced by acid corrosion on the metal surface. Hydrogen uptake is promoted in the presence of sulfides. The atomic hydrogen can diffuse into the metal, reduce ductility and increase susceptibility to cracking. High strength metallic materials and hard weld zones are prone to SSC.

    Specifications

    The Process of Sulfide Stress Cracking is defined below:

    Hydrogen dissociates from H2S to form hydrogen ions.

    Hydrogen ions pick up an electron from the steel and form atomic hydrogen. Most atomic hydrogen combines to form molecular hydrogen (H2).

    However, some atomic hydrogens diffuse into the steel and embrittle the crystalline structure reducing the tensile capacity and ductility of the material.

    The increased concentration of hydrogen atoms combined with the tensile stress causes SSC