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公开(公告)号：US20110162760A1
公开(公告)日：2011-07-07
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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12.发明授权公开(公告)号：US07731808B2
公开(公告)日：2010-06-08
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 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 钢板表面的板厚和所述平均晶体直径D（μm）满足以下公式（3）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：US10174392B2
公开(公告)日：2019-01-08
申请号：US14130568
申请日：2012-07-02
申请人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida , Mitsuru Yoshida , Kengo Hata
发明人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida , Mitsuru Yoshida , Kengo Hata
摘要： A method for producing a high-tensile cold-rolled steel sheet includes subjecting a slab having a composition containing C: more than 0.020% and less than 0.30%, Si: more than 0.10% and 3.00% or less, and Mn: more than 1.00% and 3.50% or less to hot rolling wherein the roll draft of the final one pass is higher than 15%, and rolling is finished in the temperature region of Ar3 point or higher, optionally annealing wherein the hot-rolled steel sheet is heated to 300° C. or higher after being cooled to 780° C. or lower, coiling higher than 400° C. or lower than 400° C., cold rolling the hot-rolled steel sheet or the annealed steel sheet, and annealing wherein the cold-rolled steel sheet is soaked in the temperature region of (Ac3 point−40° C.) or higher, cooling to 500° C. or lower and 300° C. or higher, and holding in that temperature region for 30 seconds or longer.
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公开(公告)号：US09523139B2
公开(公告)日：2016-12-20
申请号：US14130552
申请日：2012-06-27
申请人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida
发明人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida
IPC分类号： C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/26 , C22C38/38 , C22C38/00 , C21D9/48 , C21D1/673
CPC分类号： C22C38/38 , C21D1/673 , C21D9/48 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/26
摘要： A high-strength cold-rolled steel sheet excellent in ductility, work hardenability, and stretch flangeability, and having tensile strength of 780 MPa or more includes: a chemical composition containing, in mass percent, C: more than 0.020% to less than 0.30%, Si: more than 0.10% to 3.00% or less, Mn: more than 1.00% to 3.50% or less; and metallurgical structure whose main phase is a low-temperature transformation product, and whose secondary phase contains retained austenite. The retained austenite has a volume fraction relative to overall structure of more than 4.0% to less than 25.0% and an average grain size of less than 0.80 μm, and of the retained austenite, the number density of retained austenite grains whose grain size is 1.2 μm or more is 3.0×10−2 grains/μm2 or less.
摘要翻译： 具有优异的延展性，工作淬透性和拉伸凸缘性的拉伸强度为780MPa以上的高强度冷轧钢板包括：以质量％计含有C：大于0.020％至小于0.30的化学组成 ％，Si：大于0.10％〜3.00％以下，Mn：大于1.00％〜3.50％以下; 主要相为低温相变产物，二相为残余奥氏体的冶金结构。 残余奥氏体相对于总体结构的体积分数大于4.0％至小于25.0％，平均粒径小于0.80μm，残余奥氏体的晶粒尺寸为1.2的残余奥氏体晶粒的数量密度 μm以上为3.0×10 -2个/μm2以下。
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公开(公告)号：US20140241933A1
公开(公告)日：2014-08-28
申请号：US14130552
申请日：2012-06-27
申请人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida
发明人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida
IPC分类号： C22C38/38 , C22C38/14 , C22C38/00 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/26 , C22C38/12
CPC分类号： C22C38/38 , C21D1/673 , C21D9/48 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/26
摘要： A high-strength cold-rolled steel sheet excellent in ductility, work hardenability, and stretch flangeability, and having tensile strength of 780 MPa or more includes: a chemical composition containing, in mass percent, C: more than 0.020% to less than 0.30%, Si: more than 0.10% to 3.00% or less, Mn: more than 1.00% to 3.50% or less; and metallurgical structure whose main phase is a low-temperature transformation product, and whose secondary phase contains retained austenite. The retained austenite has a volume fraction relative to overall structure of more than 4.0% to less than 25.0% and an average grain size of less than 0.80 μm, and of the retained austenite, the number density of retained austenite grains whose grain size is 1.2 μm or more is 3.0×10−2 grains/μm2 or less.
摘要翻译： 具有优异的延展性，工作淬透性和拉伸凸缘性的拉伸强度为780MPa以上的高强度冷轧钢板包括：以质量％计含有C：大于0.020％至小于0.30的化学组成 ％，Si：大于0.10％〜3.00％以下，Mn：大于1.00％〜3.50％以下; 主要相为低温相变产物，二相为残余奥氏体的冶金结构。 残余奥氏体相对于总体结构的体积分数大于4.0％至小于25.0％，平均粒径小于0.80μm，残余奥氏体的晶粒尺寸为1.2的残余奥氏体晶粒的数量密度 μm以上为3.0×10 -2个/μm2以下。
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公开(公告)号：US20140238557A1
公开(公告)日：2014-08-28
申请号：US14130568
申请日：2012-07-02
申请人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida , Mitsuru Yoshida , Kengo Hata
发明人： Jun Haga , Takuya Nishio , Masayuki Wakita , Yasuaki Tanaka , Norio Imai , Toshiro Tomida , Mitsuru Yoshida , Kengo Hata
IPC分类号： C21D8/02
CPC分类号： C21D8/0236 , C21D8/0247 , C21D8/0273 , C21D8/1261 , C21D2211/003 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12
摘要： A method for producing a high-tensile cold-rolled steel sheet includes subjecting a slab having a composition containing C: more than 0.020% and less than 0.30%, Si: more than 0.10% and 3.00% or less, and Mn: more than 1.00% and 3.50% or less to hot rolling wherein the roll draft of the final one pass is higher than 15%, and rolling is finished in the temperature region of Ar3 point or higher, optionally annealing wherein the hot-rolled steel sheet is heated to 300° C. or higher after being cooled to 780° C. or lower, coiling higher than 400° C. or lower than 400° C., cold rolling the hot-rolled steel sheet or the annealed steel sheet, and annealing wherein the cold-rolled steel sheet is soaked in the temperature region of (Ac3 point−40° C.) or higher, cooling to 500° C. or lower and 300° C. or higher, and holding in that temperature region for 30 seconds or longer.
摘要翻译： 一种高张力冷轧钢板的制造方法，其特征在于，将含有C：大于0.020％且小于0.30％的组成的钢坯，Si：0.10％以上且3.00％以下，Mn：超过 1.00％和3.50％以下，其中最终一次的轧制通过率高于15％，并且在Ar3点以上的温度区域中进行轧制，任选地进行热轧钢板的退火 冷却至780℃以下后，将其回收至300℃以上，卷取高于400℃或低于400℃，对该热轧钢板或退火钢板进行冷轧，退火， 将冷轧钢板浸渍在（Ac3-40℃）以上的温度区域，冷却至500℃以上且300℃以上，并在该温度区域保持30秒钟 或更长。
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