| 简介 |
PROBLEM TO BE SOLVED : To provide a method for producing a steel material with little alumina cluster with which the steel material which does not cause sliver flaw of a thin sheet for car and house electric appliance, defective quality of a thick plate for structural use, a reduction in low temperature toughness of the wear resistant thick plate and has little surface flaw and inner defect such as UST defect at welded part of a steel pipe for oil well pipe, etc., can be produced by preventing the coarse alumina cluster causing the defective product in the steel material for thin sheet, thick plate, steel pipe, shaped steel, bar steel, etc., from being formed inside the molten steel and on the surface of Ar bubble.
SOLUTION : Rare earth metals (REM) of one or more elements of Ce, La, Pr or Nd, etc., are added into the molten steel having ≤30 ppm T.O after deoxidizing with Al or Al-Si so that 0.5×T.O
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