STP903: The Effect of Alloying Elements and Steelmaking Processes on the “A” Segregation Occurrence in Large Ingots

    Kim, JT
    Assistant section chiefgraduate student, Research & Development, Korea Heavy Industries & Construction Co.Korea Advanced Institute of Science & Technology, ChangwonSeoul,

    Pyo, MR
    Section chief and manager, Research & Development, Korea Heavy Industries & Construction Co., Changwon,

    Chang, YS
    Section chief and manager, Research & Development, Korea Heavy Industries & Construction Co., Changwon,

    Chang, HS
    Director, Korea Heavy Industries & Construction Co., Changwon,

    Pages: 12    Published: Jan 1986


    Abstract

    Investigations on segregation in various sizes of ingots of 13, 25, 54, 104, 180, 210, and 430-ton weight were carried out at Korea Heavy Industries and Construction Co.

    The results of the segregation examined reveal that silicon-deoxidized (SD) carbon steel ingots have much more segregation than have vacuum carbon-deoxidized (VCD) low-alloy steel ingots. That is, the total carbon segregation ratio is 41% in the 210-ton SD carbon steel ingot, whereas it is 38% and 21% in the 430 and 104-ton VCD, low-alloy steel ingots, respectively. From these results, “A” segregation is not found when the ratio of carbon segregation is less than 30 to 40% in both steel ingots. Since silicon and manganese increase the change of liquid density during solidification and molybdenum decreases it, it is possible to minimize the macrosegregation by increasing molybdenum and decreasing silicon and manganese within the specified range.

    Keywords:

    “A” segregation, segregation ratio, steelmaking process, vacuum carbon deoxidation, ingot solidification, carbon steel, Ni-Cr-Mo-V steel, alloy design, solute-enriched liquid, change of liquid density


    Paper ID: STP17351S

    Committee/Subcommittee: A01.09

    DOI: 10.1520/STP17351S


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