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    • 18. 发明授权
    • High-strength hot-dip galvanized steel sheet and method for producing the same
    • 高强度热浸镀锌钢板及其制造方法
    • US07736449B2
    • 2010-06-15
    • US11977537
    • 2007-10-24
    • Yoshihisa TakadaMasayoshi SuehiroMasao KurosakiHidekuni MurakamiHiroyasu FujiiHaruhiko EguchiHisaaki Sato
    • Yoshihisa TakadaMasayoshi SuehiroMasao KurosakiHidekuni MurakamiHiroyasu FujiiHaruhiko EguchiHisaaki Sato
    • C23C2/28
    • C22C38/02C21D1/185C21D1/74C21D8/0273C21D8/0278C21D9/46C22C38/008C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C23C2/02C23C2/40Y10T29/301Y10T428/12799Y10T428/12951
    • The present invention stably provides a high-strength hot-dip galvanized steel sheet having a high tensile strength and no non-plated portions and being excellent in workability and surface properties even when the employed equipment has only a reduction annealing furnace and a steel sheet containing relatively large amounts of Si, Mn and Al that are regarded as likely to cause non-plated portions is used as the substrate. The present invention: secures good plating performance even when the steel sheet contains Si, Mn and Al by adding Ni to a steel sheet, thus forming oxides at some portions in the steel sheet surface layer, and resultantly suppressing the surface incrassation of Si, Mn and Al at the portions where oxides are not formed; enhances the effect of Ni and accelerates the formation of oxides by further adding Mo, Cu and Sn; and moreover, in the case of a TRIP steel sheet, secures austenite by determining the ranges of Si and Al strictly, avoiding the deterioration of plating performance caused by the addition of Ni, and further adding Mo in a balanced manner.In addition, the present invention, in a TRIP steel sheet, improves press formability by regulating a retained austenite ratio and accelerates the formation of oxides by regulating a hydrogen concentration and a dew point in annealing before plating.
    • 本发明稳定地提供了具有高拉伸强度和无镀层部分的高强度热浸镀锌钢板,并且即使所用设备仅具有还原退火炉和含有 被认为可能引起非电镀部分的相对大量的Si,Mn和Al被用作衬底。 本发明:即使在钢板中含有Si,Mn和Al的钢板中也添加了Ni,从而在钢板表面层的某些部分形成氧化物,也可以确保良好的镀层性,从而抑制Si,Mn 和Al在不形成氧化物的部分; 通过进一步添加Mo,Cu和Sn,增强Ni的作用并加速氧化物的形成; 此外,在TRIP钢板的情况下,通过严格地确定Si和Al的范围来确保奥氏体,避免由于添加Ni而引起的电镀性能的劣化,并且进一步以平衡的方式添加Mo。 此外,本发明在TRIP钢板中,通过调节残留奥氏体比例,通过调节镀层前退火时的氢浓度和露点来促进氧化物的形成,提高冲压成形性。