Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in
press-formability and method for manufacturing same
    5.
    发明授权
    Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability and method for manufacturing same 失效
    压制成形性优异的合金处理铁 - 锌合金浸镀钢板及其制造方法

    公开(公告)号:US5629099A

    公开(公告)日:1997-05-13

    申请号:US356341

    申请日:1994-12-19

    摘要: An alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability, having, on the surface thereof, numerous fine concavities which satisfy the following conditions: (1) that the number of fine concavities having a depth of at least 2 .mu.m is within a range of from 200 to 8,200 per mm.sup.2 of the plating layer, and (2) that the total opening area per unit area of the fine concavities in the plating layer is within a range of from 10 to 70% of the unit area. The above-mentioned plated steel sheet is manufactured by subjecting a cold-rolled steel sheet to a zinc dip-plating treatment in a zinc dip-plating bath having an aluminum content of from 0.05 to 0.30 wt. %, in which the temperature region causing an initial reaction for forming an iron-aluminum layer is limited within a range of from 500.degree. to 600.degree. C., an alloying treatment in which an alloying treatment temperature is limited within a range of from 480.degree. to 600.degree. C., and a temper-rolling treatment. It is possible to further impart an excellent image clarity after painting to the above-mentioned plated steel sheet by replacing the above-mentioned condition (2) with a condition that a bearing length ratio tp (2 .mu.m) in a profile curve is within a range of from 30 to 90%.

    摘要翻译: PCT No.PCT / JP94 / 01052 Sec。 371日期1994年12月19日第 102(e)1994年12月19日PCT PCT 1994年6月29日PCT公布。 出版物WO95 / 01462 日期1995年1月12日具有优异的压制成形性的合金化处理的铁 - 锌合金浸镀钢板,其表面上具有满足以下条件的许多细小凹部:(1)具有 至少2μm的深度在镀层的每平方毫米2 200〜8,200的范围内,(2)镀层中的细小凹部的单位面积的总开口面积在 10到70%的单位面积。 上述电镀钢板是通过在铝含量为0.05〜0.30重量%的锌浸镀浴中对冷轧钢板进行镀锌处理而制造的。 将导致形成铁 - 铝层的初始反应的温度区域限制在500-600℃的范围内的合金化处理,其中合金化处理温度限制在480 DEG至600℃,进行回火处理。 通过在轮廓曲线中的轴承长度比tp(2μm)在其内的条件(2)代替上述条件(2),可以进一步赋予上述镀覆钢板以优异的图像清晰度 范围从30%到90%。