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    • 9. 发明申请
    • Method of Production of Hot Dip Galvannealed Steel Sheet with Excellent Workability, Powderability, and Slidability
    • 热浸镀锌钢板的制造方法,其加工性,粉化性和滑动性优异
    • US20090151820A1
    • 2009-06-18
    • US12225170
    • 2007-03-28
    • Junji HajiKaoru KawasakiKiyokazu IshizukaTeruaki Yamada
    • Junji HajiKaoru KawasakiKiyokazu IshizukaTeruaki Yamada
    • C23C2/28C23C2/02
    • C21D9/46C22C38/001C22C38/02C22C38/04C22C38/06C23C2/02C23C2/04C23C2/06C23C2/26C23C2/28
    • The present invention provides a method of production of hot dip galvannealed steel sheet with excellent workability compared with the Sendzimir method or non-oxidizing furnace method and further with excellent powdering or slidability, that is, a method of production of hot dip galvannealed steel sheet with excellent workability, powdering, and slidability characterized by processing a slab containing, by mass %, C: 0.01 to 0.12%, Mn: 0.05 to 0.6%, Si: 0.002 to 0.1%, P: 0.05% or less, S: 0.03% or less, sol. Al: 0.005 to 0.1%, and N: 0.01% or less and having a balance of Fe and unavoidable impurities by hot rolling, pickling, cold rolling, then annealing at 650 to 900° C., cooling to 250 to 450° C., holding at said temperature range for 120 seconds or more, then cooling to room temperature, pickling, preplating Ni or Ni—Fe without intermediate temper rolling, heating by 5° C./sec or more down to 430 to 500° C., galvanizing in a galvanization bath, wiping, then heating by a rate of temperature rise of 20° C./sec or more up to 460 to 550° C., not providing any soaking time or holding for soaking for less than 5 seconds, then cooling by 3° C./sec or more, and final temper rolling by a 0.4 to 2% elongation rate.
    • 本发明提供了与Sendzimir方法或非氧化炉法相比具有优异的可加工性的热浸镀锌合金化钢板的制造方法,并且还具有优异的粉化或滑动性,即,制备热浸镀锌合金的钢板的方法, 优异的加工性,粉化性和滑动性,其特征在于,以质量%计含有C:0.01〜0.12%,Mn:0.05〜0.6%,Si:0.002〜0.1%,P:0.05%以下,S:0.03% 或更少,溶胶。 Al:0.005〜0.1%,N:0.01%以下,通过热轧,酸洗,冷轧,余量为Fe和不可避免的杂质,然后在650〜900℃退火,冷却至250〜450℃。 在所述温度范围内保持120秒以上,然后冷却至室温,酸洗,预镀Ni或Ni-Fe,无中间调质轧制,加热5℃/秒以上至430〜500℃, 在镀锌浴中镀锌,擦拭,然后以20℃/秒以上的温度升温至460〜550℃进行加热,不提供任何均热时间或保持浸泡少于5秒钟,然后 冷却3℃/秒以上,最终调质轧制0.4〜2%的伸长率。