公开(公告)号：EP1227167A4

公开(公告)日：2003-03-19

申请号：EP01942682

申请日：2001-01-23

申请人： NIPPON KOKAN KK

发明人： NAGATAKI YASUNOBU ,  INAZUMI TORU ,  URABE TOSHIAKI ,  KITANO FUSATO ,  KOBAYASHI AKIO ,  TOMITA KUNIKAZU ,  NODE SHUNSAKU ,  HARADA KOZO ,  SATO SHOGO

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/24 ,  C22C38/38 ,  C23C2/02 ,  C23C2/40 ,  C22C38/00 ,  C21D8/02 ,  C21D9/46

CPC分类号： C21D8/0263 ,  C21D8/0278 ,  C21D9/56 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/24 ,  C22C38/38 ,  C23C2/02 ,  C23C2/40 ,  Y10S428/939 ,  Y10T428/12799

摘要： A method for producing a hot dip zinc plated steel sheet which comprises subjecting a steel product to a rough rolling, subjecting the resulting sheet to a finish rolling at a temperature of Ar3 point or higher, winding up the finish-rolled sheet at a temperature of 700 DEG C or lower, and subjecting the wound sheet to a hot dip zinc plating with a temperature of the heating before to plating 1 of Ac1 to Ac3; and a method for producing a hot dip zinc plated steel sheet which comprises pickling a steel belt and subjecting the pickled steel belt to a continuous hot dip zinc plating process comprising soaking the pickled steel belt at a temperature of 750 to 850 DEG C, cooling the soaked steel belt at a rate of 1 to 50 DEG C/sec to a temperature range of 600

摘要翻译： 通过轧制钢来制造热镀锌钢板，生产带材，酸洗所述带材，并进行连续热浸镀锌操作。 所述连续热浸镀锌操作是通过在750-850℃的温度下浸渍酸洗条来进行的，将浸渍的条以每秒1至50℃的冷却速率冷却至600℃或更低的温度范围 ，对冷却的条进行热浸镀锌，并冷却镀锌带，使得在400〜600℃的停留时间在200秒以内。 钢板具有主要由铁素体和马氏体组成的结构。

公开(公告)号：EP0630983A4

公开(公告)日：1995-05-03

申请号：EP94904314

申请日：1994-01-13

申请人： NIPPON KOKAN KK

发明人： NAGATAKI YASUNOBU ,  TSUYAMA SEISHI ,  HOSOYA YOSHIHIRO ,  OKITA TOMOYOSHI ,  KANETOH SHUZI ,  TAKADA YASUYUKI

IPC分类号： C22C38/04 ,  C22C38/06 ,  C21D6/00 ,  C21D9/46 ,  C22C38/58

CPC分类号： C22C38/06 ,  C22C38/04

摘要： A cold rolled steel sheet of excellent delayed fracture resistance and a superhigh strength substantially consisting of 0.1-0.25 wt.% of carbon (C), not more than 1 wt.% of silicon (Si), 1-2.5 wt.% of manganese (Mn), not more than 0.020 wt.% of phosphorus (P), not more than 0.005 wt.% of sulfur (S), 0.01-0.05 wt.% of soluble aluminum (Sol. Al), 0.0010-0.0050 wt.% of nitrogen (N), and iron and unavoidable impurities for the rest. This cold rolled steel sheet satisfies the relationships: TS >/= 320x(Ceq) -155xCeq+102 (1), wherein Ceq = C+(Si/24)+(Mn/6), and PDF >/= 0 (2), wherein RDF = -lnTS+exp(Rr/100)+2.95; PDF index of delayed fracture resistance; TS tensile strength (kgf/mm ); and Rr a residual strength ratio (%) expressed by (bending-bending-back tensile strength)/(tensile strength)x100 of a steel sheet V-bent at 90 DEG with a radius of 5 mm in the direction which is at right angles to the rolling direction.