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1.发明申请METHOD FOR MANUFACTURING HOT-ROLLED SHEET HAVING FINE-GRAINED FERRITE, AND HOT-ROLLED SHEET 审中-公开用于制造具有细粒铁粉的热轧板和热轧板的方法公开(公告)号：US20140086787A1
公开(公告)日：2014-03-27
申请号：US13792458
申请日：2013-03-11
摘要： A method for manufacturing a hot-rolled sheet attains grain refinement of the steel sheet whose grain size is extremely fine. In particular, a ferrite grain size of less than average 2 μm is obtained, which is not laminar but has ferrite grains with equiaxed morphology and exhibits high formability in forming. The method comprises the steps of rolling and cooling, wherein the rolling reductions, cooling steps, and temperature are closely regulated. A hot rolled sheet made from the method of manufacturing has a controlled ferrite grain in different regions of sheet thickness.
摘要翻译： 热轧板的制造方法可以获得晶粒细化的钢板的晶粒细化。 特别地，得到小于2μm的铁素体晶粒尺寸，其不是层状的，而是具有等轴形态的铁素体晶粒，并且在成型时表现出高的成形性。 该方法包括滚动和冷却的步骤，其中滚动减少，冷却步骤和温度被严格地调节。 由制造方法制成的热轧板在板厚不同的区域具有受控的铁素体晶粒。
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2.发明授权Method for manufacturing hot-rolled sheet having fine-grained ferrite, and hot-rolled sheet 有权具有细粒铁素体的热轧板的制造方法和热轧板公开(公告)号：US08404060B2
公开(公告)日：2013-03-26
申请号：US12525094
申请日：2007-02-02
IPC分类号： C21D8/00
摘要： A method for manufacturing a hot-rolled sheet is provided, wherein the method attains grain refinement of the steel sheet containing C, Si, and Mn, wherein the grain size thereof is set to particularly below average of 2 μm, which has ferrite grain with equiaxed morphology, which has high formability in forming, and the ferrite grain-size deviation in the thickness direction is uniformed down to the level not higher than a predetermined amount whereby uniform formability in forming is high. The method includes a first rolling for rolling the sheet such that the total rolling reduction is 80% or more or the average grain size is 30 μm or less in a form of single phase of austenite, a second rolling of a single-pass, a third rolling being conducted thereafter, and a following cooling.
摘要翻译： 提供了一种制造热轧板的方法，其中该方法对含有C，Si和Mn的钢板进行晶粒细化，其中其晶粒尺寸设定为特别低于2μm的平均值，其具有铁素体晶粒与 等轴形状，其形成成形性高，并且厚度方向的铁素体晶粒尺寸偏差均匀化到不高于预定量的水平，从而均匀成形性高。 该方法包括第一次轧制，以使得总的轧制压下量为80％以上，或平均粒径为30μm以下，奥氏体的单相，单程次的第二轧制， 此后进行第三次轧制，并进行随后的冷却。
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3.发明申请公开(公告)号：US20100089505A1
公开(公告)日：2010-04-15
申请号：US12525094
申请日：2007-02-02
摘要： The present invention provides a method for manufacturing the hot-rolled sheet, which includes: a step A including a first rolling in which a steel sheet containing 0.04-0.20% C, 0.01-2.0% Si, 0.5-3.0% Mn by mass, and the reminder being Fe and inevitable impurities, is rolled by successive multi-pass rolling at a total rolling reduction of 80% or more while keeping the steel sheet at temperatures not lower than the para-equilibrium transformation temperature Ae3; a step B including a second rolling in which a single-pass rolling is carried out at a rolling reduction of 30-55% when an entry side temperature is not lower than the para-equilibrium transformation temperature Ae3; a step C including a third rolling in which a single-pass rolling is carried out at a rolling reduction of 35-70% when an entry side temperature is set within a predetermined range; and a step D in which within 0.2 seconds after the third rolling, the rolled sheet is cooled at a cooling rate of 600 degree C./sec or higher to a temperature not higher than {(the para-equilibrium transformation temperature Ae3)−130 degree C.}, in the step C, the third rolling being carried out: within 0.6 seconds after the second rolling when the predetermined temperature range is {(the para-equilibrium transformation temperature Ae3)−60 degree C.} or more and below {(the para-equilibrium transformation temperature Ae3)−30 degree C.}; within 0.5 seconds after the second rolling when the predetermined temperature range is {(the para-equilibrium transformation temperature Ae3)−30 degree C.} or more and below {(the para-equilibrium transformation temperature Ae3)−5 degree C.}; and within 0.3 seconds after the second rolling when the predetermined temperature range is {(the para-equilibrium transformation temperature Ae3)−5 degree C.} or more and below {(the para-equilibrium transformation temperature Ae3)+20 degree C.}.
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公开(公告)号：US10774412B2
公开(公告)日：2020-09-15
申请号：US14130530
申请日：2012-06-29
申请人： Norio Imai , Masayuki Wakita , Takuya Nishio , Jun Haga , Kengo Hata , Yasuaki Tanaka , Mitsuru Yoshida , Hiroshi Takebayashi , Suguhiro Fukushima , Toshiro Tomida
发明人： Norio Imai , Masayuki Wakita , Takuya Nishio , Jun Haga , Kengo Hata , Yasuaki Tanaka , Mitsuru Yoshida , Hiroshi Takebayashi , Suguhiro Fukushima , Toshiro Tomida
IPC分类号： C21D8/02 , C22C38/12 , C22C38/02 , C22C38/06 , C22C38/04 , C22C38/00 , C21D9/46 , C23C2/02 , C23C2/04
摘要： A hot-dip galvanized cold-rolled steel sheet has a tensile strength of 750 MPa or higher, a composition consisting, in mass percent, C: more than 0.10% and less than 0.25%, Si: more than 0.50% and less than 2.0%, Mn: more than 1.50% and 3.0% or less, and optionally containing one or more types of Ti, Nb, V, Cr, Mo, B, Ca, Mg, REM, and Bi, P: less than 0.050%, S: 0.010% or less, sol. Al: 0.50% or less, and N: 0.010% or less, and a main phase as a low-temperature transformation product and a second phase as retained austenite. The retained austenite volume fraction is more than 4.0% and less than 25.0% of the whole structure, and has an average grain size of less than 0.80 μm. A number density of retained austenite grains having a grain size of 1.2 μm or more is 3.0×10−2/μm2 or less.
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5.发明申请公开(公告)号：US20140212686A1
公开(公告)日：2014-07-31
申请号：US14130530
申请日：2012-06-29
申请人： Norio Imai , Masayuki Wakita , Takuya Nishio , Jun Haga , Kengo Hata , Yasuaki Tanaka , Mitsuru Yoshida , Hiroshi Takebayashi , Suguhiro Fukushima , Toshiro Tomida
发明人： Norio Imai , Masayuki Wakita , Takuya Nishio , Jun Haga , Kengo Hata , Yasuaki Tanaka , Mitsuru Yoshida , Hiroshi Takebayashi , Suguhiro Fukushima , Toshiro Tomida
摘要： A hot-dip galvanized cold-rolled steel sheet has a tensile strength of 750 MPa or higher, a composition consisting, in mass percent, of C: more than 0.10% and less than 0.25%, Si: more than 0.50% and less than 2.0%, Mn: more than 1.50% and 3.0% or less, and optionally containing one or more types of Ti, Nb, V, Cr, Mo, B, Ca, Mg, REM, and Bi, P: less than 0.050%, S: 0.010% or less, sol. Al: 0.50% or less, and N: 0.010% or less, and a main phase as a low-temperature transformation product and a second phase as retained austenite. The retained austenite volume fraction is more than 4.0% and less than 25.0% of the whole structure, and has an average grain size of less than 0.80 □m. A number density of retained austenite grains having a grain size of 1.2 □m or more is 3.0□10−2/□m2 or less.
摘要翻译： 热浸镀锌冷轧钢板的拉伸强度为750MPa以上，以质量％计，C：0.10以上且小于0.25％的Si：超过0.50％以下 2.0％，Mn：大于1.50％和3.0％以下，并且任选地含有一种或多种Ti，Nb，V，Cr，Mo，B，Ca，Mg，REM和Bi，P：小于0.050％ ，S：0.010％以下，溶胶。 Al：0.50％以下，N：0.010％以下，作为低温相变产物的主相和作为残留奥氏体的第二相。 残留奥氏体体积分数大于整个结构的4.0％以上且小于25.0％，平均粒径小于0.80μm。 晶粒尺寸为1.2μm以上的残留奥氏体晶粒的数密度为3.0×10 -2 /□m 2以下。
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6.发明申请公开(公告)号：US20100209283A1
公开(公告)日：2010-08-19
申请号：US12768216
申请日：2010-04-27
申请人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
发明人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
CPC分类号： C23C2/40 , B32B15/012 , B32B15/013 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0405 , C21D8/0463 , C21D9/46 , C21D9/50 , C21D2201/03 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C18/04 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/28
摘要： A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof are provided. The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D (μm) satisfy the relation defined by the formula (3) given below: 1.2≦D≦7 formula (1) D≦2.7+5000/(5+350.C+40.Mn)2 formula (2) D·X≦0.1 formula (3) wherein C and Mn represent the contents (in % by mass) of the respective elements in the steel.
摘要翻译： 提供了机械强度，可加工性和热稳定性优异且适用于制造汽车，家用电器和机器结构以及建筑物的领域中的原料的钢板及其制造方法。 该钢板是碳素钢或低合金钢的热轧钢板，其主相是铁素体，其特征在于，在片材的1/4深度处的平均铁素体晶粒直径D（μm） 从钢板表面的厚度满足下面给出的式（1）和（2）所定义的关系，并且在700℃的平均铁素体晶粒直径的增加速率X（μm/ min）在深度为1/4 钢板表面的平均厚度和所述平均晶粒直径D（μm）满足以下公式（3）所定义的关系：1.2＆nlE; D＆nlE; 7式（1）D＆nlE; 2.7 + 5000 /（5+ 350.C + 40.Mn）2式（2）D·X＆nlE; 0.1式（3）其中C和Mn表示钢中各元素的含量（质量％）。
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公开(公告)号：US07927433B2
公开(公告)日：2011-04-19
申请号：US12768216
申请日：2010-04-27
申请人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
发明人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
CPC分类号： C23C2/40 , B32B15/012 , B32B15/013 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0405 , C21D8/0463 , C21D9/46 , C21D9/50 , C21D2201/03 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C18/04 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/28
摘要： A cold-rolled steel sheet of carbon steel or low-alloy steel comprising C: 0.01 to 0.25% by mass with a ferrite main phase is has an average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfying formulas (5,6) and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and D (μm) satisfying formula (3): 1.2≦D≦9.3 (5) D≦5.0−2.0·Cr+5000/(5+350·C+40·Mn)2 (6) D·X≦0.1 (3) and, at said ¼ inch depth, the area percentage of ferrite crystal grains the crystal grain diameter d (μm) of which satisfying formula (4) is at least 80%: D/3≦d≦3D (4) wherein C, Cr and Mn represent mass % of the respective elements in the steel.
摘要翻译： 含铁素体相的C：0.01〜0.25质量％的碳素钢或低合金钢的冷轧钢板的平均铁素体晶粒直径D（μm）为 钢板表面满足式（5,6）的平均铁素体晶粒直径的增加率X（μm/ min），钢板表面的厚度¼的D值（μm） ）满足式（3）：1.2＆nlE; D＆nlE; 9.3（5）D＆nlE; 5.0-2.0·Cr + 5000 /（5 + 350·C + 40·Mn）2（6）D·X＆ 在所述¼英寸深度处，铁素体晶粒的满足公式（4）的晶粒直径d（μm）的面积百分比为至少80％：D / 3＆nlE; d＆nlE; 3D（4）其中C，Cr和 Mn表示钢中各元素的质量％。
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公开(公告)号：US07879164B2
公开(公告)日：2011-02-01
申请号：US12768253
申请日：2010-04-27
申请人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
发明人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
CPC分类号： C23C2/40 , B32B15/012 , B32B15/013 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0405 , C21D8/0463 , C21D9/46 , C21D9/50 , C21D2201/03 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C18/04 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/28
摘要： A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances, machine structures, and of constructing buildings, and a manufacturing method thereof is provided. The steel sheet is a hot-rolled steel sheet of a carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D(μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D(μm) satisfy the relation defined by the formula (3) given below: 1.2≦D≦7 formula (1) D≦2.7+5000/(5+350·C+40·Mn)2 formula (2) D·X≦0.1 formula (3) wherein C and Mn represent the content (in % by mass) of the respective elements in the steel.
摘要翻译： 本发明提供一种机械强度，加工性，热稳定性优异且适用于制造汽车，家用电器，机器结构，建筑物等领域的原料的钢板及其制造方法。 该钢板是碳素钢或低合金钢的热轧钢板，其主相是铁素体，其特征在于，深度为1/4的平均铁素体晶粒直径D（μm） 从钢板表面的板厚满足下述式（1）和（2）所定义的关系，并且在700℃的平均铁素体晶粒直径的增加速度X（μm/ min）在深度为1/4 钢板表面的平均厚度和所述平均晶粒直径D（μm）满足以下公式（3）所定义的关系：1.2＆nlE; D＆nlE; 7式（1）D＆nlE; 2.7 + 5000 /（5+ 350·C + 40·Mn）2式（2）D·X＆nlE; 0.1式（3）其中，C和Mn表示钢中各元素的含量（质量％）。
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9.发明申请公开(公告)号：US20080202639A1
公开(公告)日：2008-08-28
申请号：US12068045
申请日：2008-02-01
申请人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
发明人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
CPC分类号： C23C2/40 , B32B15/012 , B32B15/013 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0405 , C21D8/0463 , C21D9/46 , C21D9/50 , C21D2201/03 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C18/04 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/28
摘要： A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof. are provided.The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D (μm) satisfy the relation defined by the formula (3) given below: 1.2≦D≦7 formula (1) D≦2.7+5000/(5+350·C+40·Mn)2 formula (2) D·X≦0.1 formula (3) wherein C and Mn represent the contents (in % by mass) of the respective elements in the steel.
摘要翻译： 机械强度，加工性，热稳定性优异的钢板，适用于制造汽车，家用电器和机器结构以及建筑物的领域的原材料及其制造方法。 被提供。 钢板是碳素钢或低合金钢的热轧钢板，其主相是铁素体，其特征在于，在片材的1/4深度处的平均铁素体晶粒直径D（母体） 从钢板表面的厚度满足下面给出的式（1）和（2）所定义的关系，并且在700℃的平均铁素体晶粒直径的增加速率X（mum / min）在深度为1/4 来自钢板表面的板厚和所述平均晶粒直径D（母）满足以下给出的公式（3）所定义的关系：<？in-line-formula description =“In-line Formulas”end =“lead “？> 1.2 <= D <= 7公式（1）<？in-line-formula description =”In-line Formulas“end =”tail“？> <？in-line-formula description =”在线公式 “end =”lead“？> D <= 2.7 + 5000 /（5 + 350.C + 40.Mn）2式（2）<？in-line-formula description =”In- 行公式“end =”tail“？> <？in-line-formula description =”In-line Formulas“end =”lea d“？> DX <= 0.1式（3）<？in-line-formula description =”In-line formula“end =”tail“？>其中C和Mn表示各自的内容（以质量％计） 钢中的元素。
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公开(公告)号：US08257517B2
公开(公告)日：2012-09-04
申请号：US13046869
申请日：2011-03-14
申请人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
发明人： Toshirou Tomida , Norio Imai , Mitsuru Yoshida , Kaori Kawano , Masayuki Wakita , Tamotsu Toki , Masanori Yasuyama , Hitomi Nishibata
CPC分类号： C23C2/40 , B32B15/012 , B32B15/013 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/0405 , C21D8/0463 , C21D9/46 , C21D9/50 , C21D2201/03 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C18/04 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/28
摘要： A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof are provided.The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D (μm) satisfy the relation defined by the formula (3) given below: 1.2≦D≦7 formula (1) D≦2.7+5000/(5+350·C+40·Mn)2 formula (2) D·X≦0.1 formula (3) wherein C and Mn represent the contents (in % by mass) of the respective elements in the steel.
摘要翻译： 提供了机械强度，可加工性和热稳定性优异且适用于制造汽车，家用电器和机器结构以及建筑物的领域中的原料的钢板及其制造方法。 该钢板是碳素钢或低合金钢的热轧钢板，其主相是铁素体，其特征在于，在片材的1/4深度处的平均铁素体晶粒直径D（μm） 从钢板表面的厚度满足下面给出的式（1）和（2）所定义的关系，并且在700℃的平均铁素体晶粒直径的增加速率X（μm/ min）在深度为1/4 钢板表面的平均厚度和所述平均晶粒直径D（μm）满足以下公式（3）所定义的关系：1.2＆nlE; D＆nlE; 7式（1）D＆nlE; 2.7 + 5000 /（5+ 350·C + 40·Mn）2式（2）D·X＆nlE; 0.1式（3）其中C和Mn表示钢中各元素的含量（质量％）。
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