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    • 3. 发明授权
    • Method of making austenitic stainless steel sheet
    • 制奥氏体不锈钢板的方法
    • US6149744A
    • 2000-11-21
    • US177470
    • 1998-10-23
    • Kunio FukudaTakumi UjiroMasaaki KohnoSusumu SatohMasahiro YoshiokaShinji Yamazaki
    • Kunio FukudaTakumi UjiroMasaaki KohnoSusumu SatohMasahiro YoshiokaShinji Yamazaki
    • C23G1/08C25F1/06C21D8/02
    • C23G1/086C25F1/06
    • Method of making a hot-rolled steel sheet having superior surface appearance, free of surface patterns and uneven glossiness from an austenitic stainless steel slab containing about 0.03 percent by weight or more of Cu, about 0.03 percent by weight or more of V, and about 0.01 percent by weight or more of Mo under any of the following conditions: (A) pickling in a nitric-hydrofluoric acid solution containing about 20 to 100 g/l of nitric acid and about 100 to 300 g/l of hydrofluoric acid; (B) controlling nitric-hydrofluoric acid content in response to the iron ion content in the solution; (C) a preliminary pickling step prior to finishing pickling; (D) grinding about 2 .mu.m or more of the surface after preliminary pickling and prior to finishing pickling; (E) causing counterflow with a relative flow rate of 0.5 to 5.0 m/sec on the sheet surface during finishing pickling; (F) adding sulfuric acid or sulfurous acid as a hydrogen ion source to the nitric-hydrofluoric acid solution; and (G) electrolysing during finishing pickling such that the ratio of the cathodic electrolysis time to the anodic electrolysis time is about 3 or more.
    • 制造含有约0.03重量%以上的Cu,约0.03重量%以上的V的奥氏体不锈钢板和具有大约0.03重量%以上的奥氏体不锈钢板的具有优异的表面外观,无表面图案和不均匀光泽度的热轧钢板的制造方法 在以下任一条件下,为0.01重量%以上的Mo:(A)在含有约20〜100g / l硝酸和约100〜300g / l氢氟酸的硝酸 - 氢氟酸溶液中酸洗; (B)响应于溶液中的铁离子含量控制硝酸 - 氢氟酸含量; (C)酸洗前的初步酸洗步骤; (D)在初步酸洗后,酸洗前,研磨约2μm或以上的表面; (E)在整理酸洗期间在片材表面上以0.5-5.0m / sec的相对流速引起逆流; (F)向硝酸 - 氢氟酸溶液中加入硫酸或亚硫酸作氢离子源; 和(G)在整理酸洗期间的电解,使得阴极电解时间与阳极电解时间的比例为约3以上。