PURPOSE: To descale a hot rolled steel strip which is stuck with scale on the surfaces at a low cost without increasing the surface roughness, by blasting fine abrasive materials to said steel plate under specific blasting conditions.
CONSTITUTION: A steel strip 1 having scale layers on the surfaces after hot rolling is passed in shot-blasting chambers 7, 8 while the strip is continuously moved vertically twice with plural deflector rolls 2, 3, 4, 5, 6. Abrasive materials of about ≤0.3mm grain size are blasted to the surfaces of the strip 1 from within about 1,000mm blasting distance at ≥30m/sec blasting rate by plural blasting devices 9a, 9b, 10a, 10b. The surfaces are descaled at a low cost while the surface roughness of about the surface by pickling is assured.
OOMORI SHIYUNJI
EGAWA TSUNEO
MIYAMOTO TADANORI
TAMADA KOUJI
OOTA KUNIO
TACHIKI HISAMOTO
ROKUTANDA HITOSHI
SINTOKOGIO LTD