公开(公告)号：US09708680B2

公开(公告)日：2017-07-18

申请号：US14391899

申请日：2012-04-12

申请人： Chikara Kami ,  Yuta Tamura ,  Takato Tamai ,  Shuji Kawamura

发明人： Chikara Kami ,  Yuta Tamura ,  Takato Tamai ,  Shuji Kawamura

IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C21D6/00 ,  C21D9/46 ,  E04C3/32

CPC分类号： C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  E04C3/32

摘要： A hot rolled steel sheet for a square column for building structural members, the hot rolled steel sheet having a composition of, in terms of % by mass, C: 0.07 to 0.18%, Mn: 0.3 to 1.5%, P: 0.03% or less, S: 0.015% or less, N: 0.006% or less, Al: 0.01 to 0.06%, and the balance being Fe and unavoidable impurities, and having a microstructure that includes a primary phase constituted of ferrite and a second phase constituted of pearlite or pearlite and bainite, wherein a second phase frequency defined by equation (1) below is 0.20 to 0.42 and a mean crystal grain diameter of the primary phase and the second phase together is 7 to 15 μm Second phase frequency=(Number of second phase grains intersecting line segments of particular length)/(Number of primary phase grains and second phase grains intersecting line segments of particular length)  (1).

公开(公告)号：US20150292054A1

公开(公告)日：2015-10-15

申请号：US14391899

申请日：2012-04-12

申请人： Chikara Kami ,  Yuta Tamura ,  Takato Tamai ,  Shuji Kawamura

发明人： Chikara Kami ,  Yuta Tamura ,  Takato Tamai ,  Shuji Kawamura

IPC分类号： C21D8/02 ,  C21D6/00 ,  C22C38/14 ,  E04C3/32 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C22C38/12

CPC分类号： C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  E04C3/32

摘要： A hot rolled steel sheet for a square column for building structural members, the hot rolled steel sheet having a composition of, in terms of % by mass, C: 0.07 to 0.18%, Mn: 0.3to 1.5%, P: 0.03% or less, S: 0.015% or less, N: 0.006% or less, Al: 0.01 to 0.06%, and the balance being Fe and unavoidable impurities, and having a microstructure that includes a primary phase constituted of ferrite and a second phase constituted of pearlite or pearlite and bainite, wherein a second phase frequency defined by equation (1) below is 0.20 to 0.42 and a mean crystal grain diameter of the primary phase and the second phase together is 7 to 15 μm Second phase frequency=(Number of second phase grains intersecting line segments of particular length)/(Number of primary phase grains and second phase grains intersecting line segments of particular length)   (1).

摘要翻译： 作为建筑构件的方柱用热轧钢板，以质量％计为C：0.07〜0.18％，Mn：0.3〜1.5％，P：0.03％的组成的热轧钢板或 S：0.015％以下，N：0.006％以下，Al：0.01〜0.06％，余量为Fe和不可避免的杂质，具有由铁素体构成的主相和由 珠光体或珠光体和贝氏体，其中由下式（1）定义的第二相频率为0.20〜0.42，一次相和第二相的平均晶粒直径为7〜15μm第二相频率=（秒数 相位晶粒与特定长度的线段相交）/（主相晶粒和第二相晶粒数量与特定长度的线段相交）（1）。

公开(公告)号：US20140290807A1

公开(公告)日：2014-10-02

申请号：US14131793

申请日：2012-06-13

申请人： Sota Goto ,  Hiroshi Nakata ,  Chikara Kami ,  Toshifumi Abe ,  Takato Tamai

发明人： Sota Goto ,  Hiroshi Nakata ,  Chikara Kami ,  Toshifumi Abe ,  Takato Tamai

IPC分类号： C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C22C38/46

CPC分类号： C22C38/58 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： A low yield ratio and high-strength hot rolled steel sheet having a composition containing, on a mass percent basis, 0.03% to 0.10% C, 0.10% to 0.50% Si, 1.4% to 2.2% Mn, 0.005 % to 0.10% Al, 0.02% to 0.10% Nb, 0.001% to 0.030% Ti, 0.05% to 0.50% Mo, 0.05% to 0.50% Cr, and 0.01% to 0.50% Ni, in which Moeq preferably satisfies the range of 1.4% to 2.2%; and a microstructure including a main phase that contains bainitic ferrite having an average grain size of 10 μm or less and a secondary phase that contains massive martensite having an aspect ratio of less than 5.0 in an area ratio of 1.4% to 15%.

摘要翻译： 低成品率和高强度热轧钢板，其组成为：以质量％计含有C：0.03〜0.10％，Si：0.10〜0.50％，Mn：1.4〜2.2％，Al：0.005〜0.10％ ，Nb：0.02〜0.10％，Ti：0.001〜0.030％，Mo：0.05〜0.50％，Ni：0.01〜0.50％，Moeq优选为1.4〜2.2％ ; 以及包含平均粒径为10μm以下的贝氏体铁素体的主相和在纵横比小于5.0的大量马氏体的面积比为1.4％〜15％的二次相的显微组织。