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  • 1.
    Eriksson, Malin
    Dalarna University, School of Technology and Business Studies, Material Science.
    Kartläggning av härdsprickor vid induktionslinjenpå stålsorterna Ovako 327A och 356D2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis work investigates the steel grades Ovako 327A and Ovako 356D. Thepurpose of the investigation is to examine the origin of the hardening crackscreated during the induction hardening process. In an earlier investigation done bythe company it was shown that carbon segregations can be the cause of theproblem. Two other causes have also been examined within this project. Thesecauses are end cracks from the cold shear process and rolling defects. The methodsof the examination are hardness testing, segregation testing and visual inspectionof the bars. The result shows increased carbon content in the centre of the bars insteel grade Ovako 327A. Steel grade Ovako 356D shows a normal carbon content.The hardness testing on steel grade Ovako 327A shows a higher hardness in thecentre compared to the surface hardness on the samples containing carbonsegregation. Discovered rolling defects have not created hardening cracks in theinduction line. The effects from end cracks could not be investigated sincediscovered end cracks had to be removed because the study was made on customermaterial. The conclusion from this thesis work is that more material from the topof the ingot in steel grade Ovako 327A should be cropped in the primary rollingmill in Hofors to remove carbon segregations. The steel grade Ovako 356D showsno sign of hardening cracks in this study.

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