| 摘要 |
PURPOSE:To provide a decreased loss of descaling, improved surface characteris tic of a steel sheet and increased speed of descaling by subjecting the steel sheet having the scale formed in a hot rolling state for a stainless steel to anodic electrolysis respectively in aq. solns. of Na2SO4 then NaCl. CONSTITUTION:The hot rolled steel sheet 5 having the scale formed of magnet ite, wustite, Cr2O3, etc., is first electrolyzed at 0.2-1.2A/cm<2> current density in an electrolytic cell 1 of the aq. soln. of 5-20% Na2SO4 with an electrode 8 as a cathode. After the steel sheet is washed in a washing tank 2, the steel sheet is electrolyzed at 0.3-0.5A/cm<2> current density in an electrolytic cell 3 of the aq. soln. of 5-20% NaCl and is then washed in a washing tank 4. The descaling line of the hot rolled SUS304 steel and waste water treatment are simplified by the above-mentioned method.
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