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公开(公告)号：US20140363696A1
公开(公告)日：2014-12-11
申请号：US14369269
申请日：2012-12-14
IPC分类号： C22C38/60 , C22C38/28 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/00 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C21D8/02 , C22C38/12
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0247 , C21D8/0263 , C21D8/0415 , C21D8/0426 , C21D8/0463 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/60 , Y10T428/12799 , Y10T428/12972
摘要： A high-strength hot rolled steel sheets with excellent stretch flangeability has small variations in mechanical properties in individual coils. Variations in strength from place to place in a coil are decreased by minimally reducing the Si and Mn contents to suppress the occurrence of problems such as segregation. Further, the microstructure of the steel sheets is configured such that a ferrite phase represents an area ratio of not less than 95%, the ferrite crystal grains have an average grain size of not less than 1 μm, and the ferrite crystal grains contain TiC with an average particle size of not more than 7 nm dispersed in the crystal grains.
摘要翻译： 具有优异的拉伸凸缘性的高强度热轧钢板在各个线圈中的机械性能的变化小。 通过最小限度地降低Si和Mn含量来降低线圈中的位置到位置的强度的变化，以抑制诸如偏析的问题的发生。 此外，钢板的微细结构使得铁素体相的面积比不小于95％，铁素体晶粒的平均晶粒尺寸不小于1μm，铁素体晶粒含有TiC与 分散在晶粒中的不超过7nm的平均粒度。
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公开(公告)号：US10533236B2
公开(公告)日：2020-01-14
申请号：US15484171
申请日：2017-04-11
IPC分类号： C21D9/46 , C21D8/02 , C21D8/04 , C22C38/00 , C22C38/14 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/22 , C22C38/28
摘要： A method of manufacturing a high-strength hot rolled steel sheet by hot rolling a steel having a chemical composition including, by mass %: C: more than 0.010% and not more than 0.06%, Si: not more than 0.3%, Mn: not more than 0.8%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.1%, N: not more than 0.01% and Ti: 0.05 to 0.10%, the balance including Fe and inevitable impurities, including: after the steel is heated to an austenite single phase region, the steel is finish rolled at a finishing delivery temperature of 860° C. to 1050° C., the steel sheet is cooled at an average cooling rate of not less than 30° C./s in a temperature range of from a temperature after the completion of the finish rolling to 750° C., and the steel sheet is coiled into a coil at a coiling temperature of 580° C. to 700° C.
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公开(公告)号：US09657382B2
公开(公告)日：2017-05-23
申请号：US14369269
申请日：2012-12-14
IPC分类号： C22C38/14 , C22C38/28 , C22C38/50 , C22C38/02 , C22C38/04 , C22C38/60 , C22C38/00 , C22C38/06 , C21D8/02 , C21D8/04 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/22 , C21D9/46
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0247 , C21D8/0263 , C21D8/0415 , C21D8/0426 , C21D8/0463 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/60 , Y10T428/12799 , Y10T428/12972
摘要： A high-strength hot rolled steel sheets with excellent stretch flangeability has small variations in mechanical properties in individual coils. Variations in strength from place to place in a coil are decreased by minimally reducing the Si and Mn contents to suppress the occurrence of problems such as segregation. Further, the microstructure of the steel sheets is configured such that a ferrite phase represents an area ratio of not less than 95%, the ferrite crystal grains have an average grain size of not less than 1 μm, and the ferrite crystal grains contain TiC with an average particle size of not more than 7 nm dispersed in the crystal grains.
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公开(公告)号：US20170218474A1
公开(公告)日：2017-08-03
申请号：US15484171
申请日：2017-04-11
IPC分类号： C21D9/46 , C22C38/60 , C22C38/28 , C22C38/22 , C22C38/16 , C22C38/00 , C22C38/12 , C22C38/10 , C22C38/06 , C22C38/04 , C22C38/02 , C21D8/02 , C22C38/14
摘要： A method of manufacturing a high-strength hot rolled steel sheet by hot rolling a steel having a chemical composition including, by mass %: C: more than 0.010% and not more than 0.06%, Si: not more than 0.3%, Mn: not more than 0.8%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.1%, N: not more than 0.01% and Ti: 0.05 to 0.10%, the balance including Fe and inevitable impurities, including: after the steel is heated to an austenite single phase region, the steel is finish rolled at a finishing delivery temperature of 860° C. to 1050° C., the steel sheet is cooled at an average cooling rate of not less than 30° C/s in a temperature range of from a temperature after the completion of the finish rolling to 750° C., and the steel sheet is coiled into a coil at a coiling temperature of 580° C. to 700° C.
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5.发明申请公开(公告)号：US20140238555A1
公开(公告)日：2014-08-28
申请号：US14354384
申请日：2012-11-01
IPC分类号： C22C38/60 , C22C38/28 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/00 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C21D8/02 , C22C38/12
CPC分类号： C22C38/001 , C21D8/0226 , C21D8/0263 , C21D9/46 , C21D2211/004 , C21D2211/005 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/28 , C22C38/60 , C23C2/02 , C23C2/06 , Y02P10/212
摘要： A high strength hot rolled steel sheet having a tensile strength of 780 MPa or more is produced by specifying the composition to contain C: more than 0.035% and 0.07% or less, Si: 0.3% or less, Mn: more than 0.35% and 0.7% or less, P: 0.03% or less, S: 0.03% or less, Al: 0.1% or less, N: 0.01% or less, Ti: 0.135% or more and 0.235% or less, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, in such a way that C, S, N, and Ti satisfy ((Ti−(48/14)N−(48/32)S)/48)/(C/12)
摘要翻译： 通过规定组成为含有C：大于0.035％和0.07％以下，Si：0.3％以下，Mn：大于0.35％的组成，制造拉伸强度为780MPa以上的高强度热轧钢板， 0.7％以下，P：0.03％以下，S：0.03％以下，Al：0.1％以下，N：0.01％以下，Ti：0.135％以上且0.235％以下，余量由 Fe（Si（48/14）N-（48/32）S）/ 48）/（C（S））中，C，S，N和Ti满足 /12)<1.0（C，S，N和Ti：各元素的含量（质量％）），并且以这样的方式指定微结构，使得基体在面积分数基础上包含超过95％的铁素体相 并且在上述铁素体相的晶粒中析出平均粒径小于10nm的细小Ti碳化物。
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