SSCC (Sulfide Stress Corrosion Cracking) of pipeline steels is mainly influenced by materials and media system, also by the condition of load. Generally, from the point of load, the SSCC tests are classified as constant deformation test, constant load test, slow strain rate test (SSRT). Three point bent-beam test and four point bent-beam test are the kinds of constant strain tests. Constant load test defined by NAGE TM01 - 77 is carried out under the constant load condition, and it was used to study SSCC in this paper. Base metals of domestic pipeline steels were used to study the effect of Mn on corrosion properties of SSCC, and welds were carried out to study the effect of MnS on corrosion properties of HIC (Hydrogen Induced Cracking) both in solutions with wet hydrogen sulfide (H2S). They were respectively conducted by referring to the standards of SSCC and HIC. Testing results revealed that with the increase of content Mn, the resistance of SSCC will be decreased from the point of metallurgic view, and it is Mn element not C element to lead to the testing results of SSCC. Meanwhile even under the condition without inclusions MnS, HIC in welds still occurred. That is to say, MnS is not necessary for HIC the presence of local banded structures in which Mn and P are inclined to aggregate cause to the phenomena of HIC.


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    Title :

    Effect of Mn and MnS on corrosion properties of domestic pipeline steels and welds


    Contributors:
    Li, Yuntao (author) / Du, Zeyu (author) / Tao, Yongyin (author) / Li, Jianjun (author)

    Published in:

    China Welding ; 13 , 2 ; 123-127


    Publication date :

    2004


    Size :

    5 Seiten, 6 Bilder, 3 Tabellen, 11 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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