STEEL WITH EXCELLENT ANTI-DUCTILE CRACK GENERATION CHARACTERISTICS IN WELD HEAT-AFFECTED ZONE AND BASE MATERIAL AND MANUFACTURING METHOD THEREFOR
    2.
    发明公开
    STEEL WITH EXCELLENT ANTI-DUCTILE CRACK GENERATION CHARACTERISTICS IN WELD HEAT-AFFECTED ZONE AND BASE MATERIAL AND MANUFACTURING METHOD THEREFOR 审中-公开
    凭借出色的ANTIDUKTILRISSBILDUNGSEIGENSCHAFTEN钢在焊接热影响区和基体材料及其制造方法

    公开(公告)号:EP2383360A4

    公开(公告)日:2017-03-29

    申请号:EP09835126

    申请日:2009-12-25

    申请人: JFE STEEL CORP

    摘要: This invention relates to steel materials suitable for use in welded structures, such as pipelines, bridges, and architectural structures, requiring structural safety and a method for manufacturing the same and particularly relates to improvement of resistance of ductile crack initiation from welded heat affected zone and a base material. Specifically, a steel material has a composition of C: 0.02 to 0.2%, Si: 0.01 to 0.5%, Mn: 0.5 to 2.5%, P: 0.05% or lower, S: 0.05% or lower, Al: 0.1% or lower, and N: 0.01% or lower and, as required, one or two or more elements selected from Cu: 0.01 to 2%, Ni: 0.01 to 5%, Cr: 0.01 to 3%, Mo: 0.01 to 2%, Nb: 0.1% or lower, V: 0.1% or lower, Ti: 0.1% or lower, B: 0.01% or lower, Ca: 0.01% or lower, and REM: 0.1 % or lower in terms of % by mass, and the balance Fe with inevitable impurities, in which the microstructure at the 1/4 position of the plate thickness contains ferrite and a hard phase, the area fraction of the hard phase is 50 to 90%, and the average aspect ratio of the ferrite is 1.5 or more.

    摘要翻译: 本发明涉及一种适用于焊接结构,:如管道,桥梁,和建筑结构用钢材,需要结构安全和用于制造相同的,并且具体地涉及改进的延性破裂发生的电阻从焊接热影响区和方法 的基材。 具体地,钢材料具有℃的组合物:0.02〜0.2%以下,Si:0.01〜0.5%以下,Mn:0.5〜2.5%,P:0.05%以下,S:0.05%或以下,Al:0.1%或更低 及N:0.01%或更低,根据需要,由Cu中的一种或两种或多种元素:0.01〜2%以下,Ni:0.01〜5%以下,Cr:0.01〜3%以下,Mo:0.01〜2%以下,Nb :0.1%以下,V:0.1%以下,钛:0.1%以下,B:0.01%以下,钙:0.01%以下,REM:0.1%或更低的以质量%计,并且 与其中在板厚1/4位置处的组织中含有铁素体和硬质相不可避免的杂质余量的Fe,硬质相的面积分数为50〜90%,铁素体的平均纵横比为1.5 以上。