| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.3 ( September 1981 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| A New Rolling Method of Slab into Beam Blanks for Large H-shapes Tadaaki Yanazawa, Teruaki Tanaka, Masashi Yamashita, Hiroshi Okumura, Takashi Kusaba |
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Synopsis : A new beam blank rolling method has been developed to produce H-shapes from CC slabs instead of ingots. The method comprises a forming of an even-shaped dog-bone by edging a slab through a convex-shape (belly) pass (e.g. through the box pass with belly) and an expansion of web height of the dog-bone by a partial web rolling which gives the web little longitudinal elongation and does not reduce the sectional area of both flanges of the dog-bone. This method has been proved useful in producing all series of large H-shapes from CC slab on the wide flange beam mill at Mizushima Works without going through the blooming mill. The effects of the new method are as follows: (a) Improvement in yield (product/crude steel):12% (b) Energy saving: 150 x 10 3 kcal/t (c) Improvement in H-shape quality: Few surface and internal defects |
| TextiPDF: 12p./510kbj |