公开(公告)号：US06280538B1

公开(公告)日：2001-08-28

申请号：US09438374

申请日：1999-11-12

申请人： Tetsuo Soshiroda ,  Yoichi Mukai ,  Michiharu Nakaya

发明人： Tetsuo Soshiroda ,  Yoichi Mukai ,  Michiharu Nakaya

IPC分类号： C22C3802

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/04 ,  C22C38/06 ,  Y02P10/212

摘要： A hot rolled high strength steel sheet having a satisfactory strength-elongation balance and an stretch frangibility and with excellent formability comprising a steel, which contains: C :0.05 ˜ 0.15% Si :0.5 ˜ 2.0% Mn :0.5 ˜ 2.0% P :0.05% or less S :0.010% or less Al :0.005 ˜ less than 0.10%, and the balance of Fe and inevitable impurities, and in which the metal structure mainly comprises three phases of ferrite, retained austenite and bainite, the amount of the ferrite [V(F)] is 60˜95 area %, the amount of the retained austenite [V(&ggr;)] is 3˜15 vol %, the amount of the bainite [V(B)] in the area ratio is 1.5 times or more of the amount of the retained austenite [V(&ggr;)], and the average hardness of the bainite is 240-400 Hv.

摘要翻译： 一种具有令人满意的强度 - 伸长率平衡和拉伸脆性并且具有优异的可成形性的热轧高强度钢板，其包含：余量的Fe和不可避免的杂质，其中金属结构主要包括三相铁素体 ，残留奥氏体和贝氏体，铁素体[V（F）]的含量为60〜95面积％，残留奥氏体[V（γ）]的量为3〜15体积％，贝氏体[V （B）]的面积比为残留奥氏体量[V（γ）]的1.5倍以上，贝氏体的平均硬度为240〜400Hv。

公开(公告)号：US20090065098A1

公开(公告)日：2009-03-12

申请号：US12279552

申请日：2007-03-12

申请人： Tetsuo Soshiroda ,  Tetsuji Hoshika

发明人： Tetsuo Soshiroda ,  Tetsuji Hoshika

IPC分类号： C23C8/26 ,  C22C38/04

CPC分类号： C23C8/26 ,  C21D1/06 ,  C21D1/76 ,  C21D3/08 ,  C21D8/1255 ,  C21D9/46 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C8/80

摘要： The present invention provides a high-strength steel material capable of suppressing formation of blowholes during welding even if the strength thereof is improved by nitriding, and a method of manufacturing such a high-strength steel material by using a low rolling force. A high-strength steel of the present invention contains 0.05% (percent by mass unless otherwise specified in describing chemical composition) or below C, 1% or below Si, 1.5% or below Mn, 0.05% or below P, 0.05% or below S, 0.05% or below Al, 0.02 to 0.3% Ti, and 0.020% or below N. The high-strength steel material has metallographic structure of a single phase of ferrite and contains Ti nitride grains having a maximum size of 20 nm or below and coherently precipitated in a density of 250 grains/μm2 or above. In the high-strength steel material, the ratio of the number of Ti nitride grains having a maximum size of 6 nm or below to that of Ti nitride grains having a maximum size of 20 nm or below is 80% or above.

摘要翻译： 本发明提供一种能够抑制焊接时的气孔形成的高强度钢材，即使通过氮化来提高其强度，也可以使用低轧制力制造高强度钢材的方法。 本发明的高强度钢含有0.05％（除非在描述化学成分中另有说明）或低于C，1％以下Si，1.5％以下Mn，0.05％以下P，0.05％以下 S，0.05％以下Al，0.02〜0.3％Ti，0.020％以下N。高强度钢材料具有单相铁素体的金相组织，含有最大尺寸为20nm以下的Ti氮化物粒子 并以250谷物/ m 2或更高的密度相干沉淀。 在高强度钢材中，最大尺寸为6nm以下的Ti氮化物粒子数与最大尺寸为20nm以下的Ti氮化物粒子的比例为80％以上。

公开(公告)号：US20070272333A1

公开(公告)日：2007-11-29

申请号：US11734556

申请日：2007-04-12

申请人： Kazuya KIMIJIMA ,  Tetsuo Soshiroda

发明人： Kazuya KIMIJIMA ,  Tetsuo Soshiroda

IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/22 ,  C22C38/44

CPC分类号： C22C38/22 ,  C21D1/18 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/02 ,  C22C38/38 ,  Y02P10/212

摘要： Disclosed is a hot rolled steel sheet in which it includes a steel having a chemical composition of 0.03 to 0.10% (the percent hereinafter representing % by mass) of C, 0.2 to 2.0% of Si, 0.5 to 2.5% of Mn, 0.02 to 0.10% of Al, 0.2 to 1.5% of Cr, 0.1 to 0.5% of Mo, and the residue of iron and inevitable contaminants, and in this steel sheet, at least 80% by area in longitudinal cross section has a martensitic structure. As a consequence, a high strength hot rolled steel sheet having a tensile strength of the level as high as 980 MPa or higher simultaneously with an excellent forming workability, and in particular, excellent stretch flangeability is provided at a relatively low cost.

摘要翻译： 公开了一种热轧钢板，其中包括化学成分为0.03〜0.10％（以下占百分数％）为C，Si为0.2〜2.0％，Mn为0.5〜2.5％，0.02〜 Al：0.10％，Cr：0.2〜1.5％，Mo：0.1〜0.5％，铁和不可避免的污染物残渣，在该钢板中，纵截面的面积至少为80％以上具有马氏体组织。 结果，以相对较低的成本提供了具有高达980MPa或更高的拉伸强度的高强度热轧钢板，同时具有优异的成型加工性，特别是优异的拉伸凸缘性。

公开(公告)号：US20110297281A1

公开(公告)日：2011-12-08

申请号：US13210807

申请日：2011-08-16

申请人： Motoo SATOU ,  Tetsuo Soshiroda

发明人： Motoo SATOU ,  Tetsuo Soshiroda

IPC分类号： C21D9/46 ,  C22C38/50 ,  C22C38/42 ,  C22C38/54 ,  C22C38/48 ,  C22C38/44

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： A high-strength hot-rolled steel sheet containing C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.05 to 0.2%, which is characterized in that its metallographic structure is composed of 60 to 95 vol % of bainite and solid solution-hardened or precipitation-hardened ferrite (or ferrite and martensite) and its fracture appearance transition temperature (vTrs) is no higher than 0° C. as obtained by impact tests. (% in terms of % by weight)

摘要翻译： 含有C：0.05〜0.15％，Si：不大于1.50％（不含0％），Mn：0.5〜2.5％，P：不大于0.035％（不含0％）的高强度热轧钢板， S：不大于0.01％（包括0％），Al：0.02〜0.15％，Ti：0.05〜0.2％，其特征在于金相组织为60〜95体积％的贝氏体和固溶体， 硬化或沉淀硬化铁素体（或铁素体和马氏体）及其断裂外观转变温度（vTrs）不高于通过冲击试验得到的0℃。 （以重量％计）

公开(公告)号：US08038809B2

公开(公告)日：2011-10-18

申请号：US11908423

申请日：2006-03-22

申请人： Motoo Satou ,  Tetsuo Soshiroda

发明人： Motoo Satou ,  Tetsuo Soshiroda

IPC分类号： C22C38/04 ,  C22C38/14 ,  C21D8/04 ,  C21D8/02

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： A high-strength hot-rolled steel sheet containing C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.05 to 0.2%, which is characterized in that its metallographic structure is composed of 60 to 95 vol % of bainite and solid solution-hardened or precipitation-hardened ferrite (or ferrite and martensite) and its fracture appearance transition temperature (vTrs) is no higher than 0° C. as obtained by impact tests. (% in terms of % by weight).

摘要翻译： 含有C：0.05〜0.15％，Si：不大于1.50％（不含0％），Mn：0.5〜2.5％，P：不大于0.035％（不含0％）的高强度热轧钢板， S：不大于0.01％（包括0％），Al：0.02〜0.15％，Ti：0.05〜0.2％，其特征在于金相组织为60〜95体积％的贝氏体和固溶体， 硬化或沉淀硬化铁素体（或铁素体和马氏体）及其断裂外观转变温度（vTrs）不高于通过冲击试验得到的0℃。 （按重量％计）。

公开(公告)号：US09085816B2

公开(公告)日：2015-07-21

申请号：US12488140

申请日：2009-06-19

申请人： Tetsuo Soshiroda ,  Reiichi Suzuki ,  Kei Yamazaki

发明人： Tetsuo Soshiroda ,  Reiichi Suzuki ,  Kei Yamazaki

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/60 ,  C22C38/00 ,  C22C33/00 ,  C21D6/00 ,  C21D8/04 ,  C21D9/46 ,  B23K35/02 ,  B23K35/30 ,  C21C7/10

CPC分类号： C22C38/02 ,  B23K35/0261 ,  B23K35/3073 ,  B23K2101/16 ,  C21C7/10 ,  C21D6/008 ,  C21D8/0426 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  Y10T428/265

摘要： Disclosed is a steel sheet, containing: Si: 0.20-2% (the term “%” herein means “mass %”, the same is true hereinbelow), Mn: 1-2.5%, a total mass of Si and Mn being 1.5% or more, and O: 0.002% or less (exclusive of 0%), C: 0.02-0.25%, P: 0.1% or less (exclusive of 0%), S: 0.05% or less (exclusive of 0%), Al—0.02-0.2%, and N: 0.0015-0.015%. The steel sheet of the invention can be advantageously used for forming wide beads even in high-speed arc welding of 100 cm/min or higher.

摘要翻译： 公开了一种钢板，其含有：Si：0.20〜2％（术语“％”在此表示“质量％”，下同），Mn：1-2.5％，Si和Mn的总质量为1.5 ％以上，O：0.002％以下（不含0％），C：0.02〜0.25％，P：0.1％以下（不含0％），S：0.05％以下（不含0％） ，Al-0.02-0.2％，N：0.0015-0.015％。 即使在100cm / min以上的高速电弧焊接中，本发明的钢板也可以有利地用于形成宽珠。

公开(公告)号：US08529829B2

公开(公告)日：2013-09-10

申请号：US12294341

申请日：2007-03-14

申请人： Motoo Satou ,  Tetsuo Soshiroda

发明人： Motoo Satou ,  Tetsuo Soshiroda

IPC分类号： C22C38/16 ,  C22C38/00 ,  C22C38/08

CPC分类号： C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16

摘要： Disclosed herein is a high-strength hot-rolled steel sheet which is characterized by high strength (in terms of tensile strength at 900 MPa level) and excellent combined formability expressed by balance between strength and ductility [tensile strength (TS)×total elongation (El)] and balance between strength and stretch flangeability [tensile strength (TS)×bore expanding ratio (λ)]. The hot-rolled steel sheet contains C: no less than 0.02% and no more than 0.15%, Si: no less than 0.2% and no more than 2.0%, Mn: no less than 0.5% and no more than 2.5%, Al: no less than 0.02% and no more than 0.15%, Cu: no less than 1.0% and no more than 3.0%, Ni: no less than 0.5% and no more than 3.0%, and Ti: no less than 0.03% and no more than 0.5%. (% means mass %) It also has a metallographic structure in longitudinal cross section such that the sum of bainitic ferrite and granular bainitic ferrite accounts for no less than 85% by area.

摘要翻译： 本发明公开了一种高强度热轧钢板，其特征在于强度（以900MPa级别的拉伸强度计）和由强度和延展性之间的平衡表示的优异的组合成形性[拉伸强度（TS）×总伸长率 El）]和强度和拉伸凸缘性之间的平衡[拉伸强度（TS）×孔膨胀比（λ）]。 热轧钢板的C：不小于0.02％且不大于0.15％，Si：不小于0.2％且不大于2.0％，Mn：不小于0.5％且不大于2.5％，Al ：不小于0.02％且不大于0.15％，Cu：不小于1.0％且不大于3.0％，Ni：不小于0.5％且不大于3.0％，Ti：不小于0.03％ 不超过0.5％。 （％表示质量％）纵截面中也具有金相组织，贝氏体铁素体和粒状贝氏体铁素体的总和不小于85％。

公开(公告)号：US08163107B2

公开(公告)日：2012-04-24

申请号：US12279552

申请日：2007-03-12

申请人： Tetsuo Soshiroda ,  Tetsuji Hoshika

发明人： Tetsuo Soshiroda ,  Tetsuji Hoshika

IPC分类号： C22C38/00

CPC分类号： C23C8/26 ,  C21D1/06 ,  C21D1/76 ,  C21D3/08 ,  C21D8/1255 ,  C21D9/46 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C8/80

摘要： The present invention provides a high-strength steel material capable of suppressing formation of blowholes during welding even if the strength thereof is improved by nitriding, and a method of manufacturing such a high-strength steel material by using a low rolling force. A high-strength steel of the present invention contains 0.05% (percent by mass unless otherwise specified in describing chemical composition) or below C, 1% or below Si, 1.5% or below Mn, 0.05% or below P, 0.05% or below S, 0.05% or below Al, 0.02 to 0.3% Ti, and 0.020% or below N. The high-strength steel material has metallographic structure of a single phase of ferrite and contains Ti nitride grains having a maximum size of 20 nm or below and coherently precipitated in a density of 250 grains/μm2 or above. In the high-strength steel material, the ratio of the number of Ti nitride grains having a maximum size of 6 nm or below to that of Ti nitride grains having a maximum size of 20 nm or below is 80% or above.

摘要翻译： 本发明提供一种能够抑制焊接时的气孔形成的高强度钢材，即使通过氮化来提高其强度，也可以使用低轧制力制造高强度钢材的方法。 本发明的高强度钢含有0.05％（除非在描述化学成分中另有说明）或低于C，1％以下Si，1.5％以下Mn，0.05％以下P，0.05％以下 S，0.05％以下Al，0.02〜0.3％Ti，0.020％以下N。高强度钢材料具有单相铁素体的金相组织，含有最大尺寸为20nm以下的Ti氮化物粒子 并以250粒度/μm2以上的密度相干沉淀。 在高强度钢材中，最大尺寸为6nm以下的Ti氮化物粒子数与最大尺寸为20nm以下的Ti氮化物粒子的比例为80％以上。

公开(公告)号：US07846275B2

公开(公告)日：2010-12-07

申请号：US11734556

申请日：2007-04-12

申请人： Kazuya Kimijima ,  Tetsuo Soshiroda

发明人： Kazuya Kimijima ,  Tetsuo Soshiroda

IPC分类号： C22C38/22 ,  C21D8/02

CPC分类号： C22C38/22 ,  C21D1/18 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/02 ,  C22C38/38 ,  Y02P10/212

摘要： Disclosed is a hot rolled steel sheet in which it includes a steel having a chemical composition of 0.03 to 0.10% (the percent hereinafter representing % by mass) of C, 0.2 to 2.0% of Si, 0.5 to 2.5% of Mn, 0.02 to 0.10% of Al, 0.2 to 1.5% of Cr, 0.1 to 0.5% of Mo, and the residue of iron and inevitable contaminants, and in this steel sheet, at least 80% by area in longitudinal cross section has a martensitic structure. As a consequence, a high strength hot rolled steel sheet having a tensile strength of the level as high as 980 MPa or higher simultaneously with an excellent forming workability, and in particular, excellent stretch flangeability is provided at a relatively low cost.

摘要翻译： 公开了一种热轧钢板，其中包括化学成分为0.03〜0.10％（以下占百分数％）为C，Si为0.2〜2.0％，Mn为0.5〜2.5％，0.02〜 Al：0.10％，Cr：0.2〜1.5％，Mo：0.1〜0.5％，铁和不可避免的污染物残渣，在该钢板中，纵截面的面积至少为80％以上具有马氏体组织。 结果，以相对较低的成本提供了具有高达980MPa或更高的拉伸强度的高强度热轧钢板，同时具有优异的成型加工性，特别是优异的拉伸凸缘性。

公开(公告)号：US07682467B2

公开(公告)日：2010-03-23

申请号：US11037159

申请日：2005-01-19

申请人： Tetsuo Soshiroda ,  Masaaki Miura ,  Tohru Shiogama

发明人： Tetsuo Soshiroda ,  Masaaki Miura ,  Tohru Shiogama

IPC分类号： C22C38/00

CPC分类号： C22C38/18 ,  C21D1/19 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/34 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： Disclosed is a high-strength hot-rolled steel sheet containing C in a range of 0.03 to 0.15 mass %, Mn in a range of 0.5 to 2 mass %, and Al in a range of 0.01 to 0.1 mass %, respectively, while controlling S to not more than 0.02 mass % (0% included), wherein the metallic structure thereof has a polygonal ferrite as the main phase, and contains martensite as a second phase, further containing P in a range of 0.030 to 0.08 mass %, and Cr in a range of 0.3 to 1.00 mass %, respectively, while controlling Si to not more than 0.1 mass % (0% included). Thus, a high-strength hot-rolled steel sheet superior in workability, and fatigue property, and excellent in surface quality is provided at a relatively low cost.

摘要翻译： 公开了一种含有0.03〜0.15质量％的C，Mn在0.5〜2质量％的范围内，Al分别为0.01〜0.1质量％的Al的高强度热轧钢板，同时控制 S为0.02质量％以下（含有0％），其中金属组织以多边形铁素体为主相，含有马氏体作为第二相，进一步含有P在0.030〜0.08质量％的范围内，以及 Cr分别为0.3〜1.00质量％的范围，同时将Si控制在0.1质量％以下（含有0％）。 因此，以相对较低的成本提供了加工性，疲劳特性优异，表面质量优异的高强度热轧钢板。