According to the study of the microstructure and properties of X100 pipeline steel, the welding consumable-wire based on Mn-Ni-Mo-B-Ti alloy system was successfully designed and developed. The yield strength of the deposited metal of the developed welding wire was 695 MPa, the tensile strength was 810 MPa, and Charpy impact energy was 92 J at -20 °C when matching with BSG-SJ101H1 sintered flux. The results of the weldability test for X100 pipeline steel which adopting this developed wire showed that the tensile strength of the weld was 827 MPa, 185 J of Charpy impact energy (-10 °C) , 97% of section of shear and the weld had good strength and toughness matching when the welding speed got to 1.7 m/min. The microstructure and fracture appearance of the weld were analyzed by using metallographic microscope, scanning electron microscope (SEM) and laser confocal microscope, the results indicated that the microstructure ivas mainly granular bainite in the weld metal, and the fracture was dimple with 200 - 300 µm depth presenting a typical ductile fracture characteristics. The test of welding wire with different content of Ni and Cr element indicated that Ni was better than Cr in improving the strength and toughness of weld metal.


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    Title :

    Research on submerged arc welding wire for XI00 pipeline steel


    Contributors:
    Zongyue, Bi (author) / Liu, Haizhang (author) / Xiaotian, Jing (author) / Hui, Niu (author)

    Published in:

    China Welding ; 20 , 2 ; 56-62


    Publication date :

    2011


    Size :

    7 Seiten, 4 Bilder, 3 Tabellen, 10 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English