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1. 发明授权

US06228183B1 Ultra-high strength, weldable, boron-containing steels with superior toughness 失效
标题翻译：超高强度，可焊接，具有优异韧性的含硼钢
公开(公告)号：US06228183B1
公开(公告)日：2001-05-08
申请号：US09123791
申请日：1998-07-28
申请人： Narasimha-Rao V. Bangaru , Jayoung Koo , Michael J. Luton , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada
发明人： Narasimha-Rao V. Bangaru , Jayoung Koo , Michael J. Luton , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada
IPC分类号： C22C3814
CPC分类号： C22C38/06 , C21D1/19 , C21D8/00 , C21D2211/002 , C21D2211/008 , C22C38/04 , C22C38/12 , C22C38/14
摘要： An ultra-high strength boron-containing steel having a tensile strength of at least about 900 MPa (130 ksi), a toughness as measured by Charpy V-notch impact test at −40° C. (−40° F.) of at least about 120 joules (90 ft-lbs), and a microstructure comprising predominantly fine-grained lower bainite, fine-grained lath martensite, or mixtures thereof, transformed from substantially unrecrystallized austenite grains and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, vanadium, molybdenum, chromium, titanium, aluminum, calcium, Rare Earth Metals, and magnesium, is prepared by heating a steel slab to a suitable temperature; reducing the slab to form plate in one or more hot rolling passes in a first temperature range in which austenite recrystallizes; further reducing said plate in one or more hot rolling passes in a second temperature range below said first temperature range and above the temperature at which austenite begins to transform to ferrite during cooling; quenching said plate to a suitable Quench Stop Temperature; and stopping said quenching and allowing said plate to air cool to ambient temperature.
摘要翻译：具有至少约900MPa（130ksi）拉伸强度的超高强度含硼钢，在-40℃（-40°F）下通过夏比V-缺口冲击试验测得的韧性至少约120焦耳（90ft-lbs），以及由基本上未再结晶的奥氏体晶粒转化并且包含铁和特定重量百分比的添加剂的主要包含细粒度的下贝氏体，细粒状板条马氏体或其混合物的微观结构：碳通过将钢坯加热到合适的温度来制备硅，锰，铜，镍，铌，钒，钼，铬，钛，铝，钙，稀土金属和镁，在奥氏体重结晶的第一温度范围内，在一个或多个热轧道中将板坯还原成板; 在低于所述第一温度范围的第二温度范围内并且高于在冷却期间奥氏体开始转变为铁素体的温度的一个或多个热轧道中进一步减少所述板; 将所述板淬火至合适的淬火停止温度; 并停止所述淬火并允许所述板空气冷却至环境温度。

2. 发明授权

US06264760B1 Ultra-high strength, weldable steels with excellent ultra-low temperature toughness 失效
标题翻译：超高强度，可焊接的钢，具有优异的超低温韧性
公开(公告)号：US06264760B1
公开(公告)日：2001-07-24
申请号：US09123625
申请日：1998-07-28
申请人： Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada , Michael J. Luton , Jayoung Koo , Narasimha-Rao V. Bangaru , Clifford W. Petersen
发明人： Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada , Michael J. Luton , Jayoung Koo , Narasimha-Rao V. Bangaru , Clifford W. Petersen
IPC分类号： C22C3808
CPC分类号： C21D8/0226 , C21D1/19 , C21D2211/002 , C21D2211/008 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14
摘要： An ultra-high strength steel having excellent ultra-low temperature toughness, a tensile strength of at least about 930 MPa (135 ksi), and a microstructure comprising predominantly fine-grained lower bainite, fine-grained lath martensite, or mixtures thereof, transformed from substantially unrecrystallized austenite grains and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, vanadium, molybdenum, chromium, titanium, aluminum, calcium, Rare Earth Metals, and magnesium, is prepared by heating a steel slab to a suitable temperature; reducing the slab to form plate in one or more hot rolling passes in a first temperature range in which austenite recrystallizes; further reducing said plate in one or more hot rolling passes in a second temperature range below said first temperature range and above the temperature at which austenite begins to transform to ferrite during cooling; quenching said plate to a suitable Quench Stop Temperature; and stopping said quenching and allowing said plate to air cool to ambient temperature.
摘要翻译：具有优异的超低温韧性，至少约930MPa（135ksi）的拉伸强度和主要包含细粒度的下贝氏体，细粒状板条马氏体或其混合物的微观结构的超高强度钢被转化来自基本上未再结晶的奥氏体晶粒并且包含铁和指定重量百分比的添加剂：碳，硅，锰，铜，镍，铌，钒，钼，铬，钛，铝，钙，稀土金属和镁，由将钢板加热到合适的温度; 在奥氏体重结晶的第一温度范围内，在一个或多个热轧道中将板坯还原成板; 在低于所述第一温度范围的第二温度范围内并且高于在冷却期间奥氏体开始转变为铁素体的温度的一个或多个热轧道中进一步减少所述板; 将所述板淬火至合适的淬火停止温度; 并停止所述淬火并允许所述板空气冷却至环境温度。

3. 发明授权

US06224689B1 Ultra-high strength, weldable, essentially boron-free steels with superior toughness 失效
标题翻译：超高强度，可焊接，基本上无硼钢，韧性优越
公开(公告)号：US06224689B1
公开(公告)日：2001-05-01
申请号：US09123859
申请日：1998-07-28
申请人： Jayoung Koo , Michael J. Luton , Narasimha-Rao V. Bangaru , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada
发明人： Jayoung Koo , Michael J. Luton , Narasimha-Rao V. Bangaru , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Yoshio Terada
IPC分类号： C22C3812
CPC分类号： C22C38/08 , C21D1/19 , C21D2211/002 , C21D2211/005 , C22C38/04 , C22C38/12 , C22C38/14
摘要： An ultra-high strength essentially boron-free steel having a tensile strength of at least about 900 MPa (130 ksi), a toughness as measured by Charpy V-notch impact test at −40° C. (−40° F.) of at least about 120 joules (90 ft-lbs), and a microstructure comprising predominantly fine-grained lower bainite, fine-grained lath martensite, or mixtures thereof, transformed from substantially unrecrystallized austenite grains and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, vanadium, molybdenum, chromium, titanium, aluminum, calcium, Rare Earth Metals, and magnesium, is prepared by heating a steel slab to a suitable temperature; reducing the slab to form plate in one or more hot rolling passes in a first temperature range in which austenite recrystallizes; further reducing said plate in one or more hot rolling passes in a second temperature range below said first temperature range and above the temperature at which austenite begins to transform to ferrite during cooling; quenching said plate to a suitable Quench Stop Temperature; and stopping said quenching and allowing said plate to air cool to ambient temperature.
摘要翻译：具有至少约900MPa（130ksi）拉伸强度的超高强度基本上不含硼的钢，在-40℃（-40°F）下通过夏比V-缺口冲击试验测得的韧性至少约120焦耳（90ft-lbs），以及由基本上未再结晶的奥氏体晶粒转化并且包含铁和特定重量百分比的添加剂的主要包含细粒度的下贝氏体，细粒状板条马氏体或其混合物的显微组织：通过将钢坯加热到合适的温度来制备碳，硅，锰，铜，镍，铌，钒，钼，铬，钛，铝，钙，稀土金属和镁。在奥氏体重结晶的第一温度范围内，在一个或多个热轧道中将板坯还原成板; 在低于所述第一温度范围的第二温度范围内并且高于在冷却期间奥氏体开始转变为铁素体的温度的一个或多个热轧道中进一步减少所述板; 将所述板淬火至合适的淬火停止温度; 并停止所述淬火并允许所述板空气冷却至环境温度。

4. 发明授权

US06248191B1 Method for producing ultra-high strength, weldable steels with superior toughness 失效
标题翻译：具有优异韧性的超高强度，可焊接钢的生产方法
公开(公告)号：US06248191B1
公开(公告)日：2001-06-19
申请号：US09123858
申请日：1998-07-28
申请人： Michael J. Luton , Jayoung Koo , Narasimha-Rao V. Bangaru , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Masaaki Sugiyama
发明人： Michael J. Luton , Jayoung Koo , Narasimha-Rao V. Bangaru , Clifford W. Petersen , Hiroshi Tamehiro , Hitoshi Asahi , Takuya Hara , Masaaki Sugiyama
IPC分类号： C21D800
CPC分类号： C21D6/005 , C21D1/19 , C21D8/0226 , C21D2211/002 , C21D2211/008
摘要： A method is provided for producing an ultra-high strength steel having a tensile strength of at least about 900 MPa (130 ksi), a toughness as measured by Charpy V-notch impact test at −40° C. (−40° F.) of at least about 120 joules (90 ft-lbs), and a microstructure comprising predominantly fine-grained lower bainite, fine-grained lath martensite, or mixtures thereof, transformed from substantially unrecrystallized austenite grains and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, vanadium, molybdenum, chromium, titanium, aluminum, calcium, Rare Earth Metals, and magnesium. A steel slab is heated to a suitable temperature; the slab is reduced to form plate in one or more hot rolling passes in a first temperature range in which austenite recrystallizes; said plate is further reduced in one or more hot rolling passes in a second temperature range below said first temperature range and above the temperature at which austenite begins to transform to ferrite during cooling; said plate is quenched to a suitable Quench Stop Temperature; and said quenching is stopped and said plate is allowed to air cool to ambient temperature.
摘要翻译：提供一种制造抗拉强度为至少约900MPa（130ksi）的超高强度钢，-40℃下通过夏比V-缺口冲击试验测得的韧性的方法（-40°F））至少约120焦耳（90ft-lbs），以及由基本上未再结晶的奥氏体晶粒转化并且包含铁和特定重量百分比的主要由细晶粒的下贝氏体，细粒状板条马氏体或其混合物组成的微结构，添加剂：碳，硅，锰，铜，镍，铌，钒，钼，铬，钛，铝，钙，稀土金属和镁。将钢坯加热到合适的温度; 在奥氏体再结晶的第一温度范围内，在一个或多个热轧道中，将板坯还原成板; 所述板在一个或多个热轧道中在低于所述第一温度范围和高于在冷却期间奥氏体开始转变为铁素体的温度的温度范围内进一步减小; 所述板淬火至合适的淬火停止温度; 并且停止淬火，并使所述板空气冷却至环境温度。

5. 发明授权

US06245290B1 High-tensile-strength steel and method of manufacturing the same 有权
标题翻译：高强度钢及其制造方法
公开(公告)号：US06245290B1
公开(公告)日：2001-06-12
申请号：US09380254
申请日：1999-08-25
申请人： Jayoung Koo , Narasimha-Rao V. Bangaru , Michael J. Luton , Clifford W. Petersen , Kazuki Fujiwara , Shuji Okaguchi , Masahiko Hamada , Yu-ichi Komizo
发明人： Jayoung Koo , Narasimha-Rao V. Bangaru , Michael J. Luton , Clifford W. Petersen , Kazuki Fujiwara , Shuji Okaguchi , Masahiko Hamada , Yu-ichi Komizo
IPC分类号： C21D800
CPC分类号： C22C38/02 , C21D8/0226 , C21D2211/002 , C21D2211/008 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A high-tensile-strength steel having excellent toughness throughout its thickness, excellent properties at welded joints, and a tensile strength (TS) of at least about 900 MPa (130 ksi), and a method for making such steel, are provided. Steels according to this invention preferably have the following composition based on % by weight: carbon (C): 0.02% to 0.1%; silicon (Si): not greater than 0.6%; manganese (Mn): 0.2% to 2.5%; nickel (Ni): 0.2% to 1.2%; niobium (Nb): 0.01% to 0.1%; titanium (Ti): 0.005% to 0.03%; aluminum (Al): not greater than 0.1%; nitrogen (N): 0.001% to 0.006%; copper (Cu): 0% to 0.6%; chromium (Cr): 0% to 0.8%; molybdenum (Mo): 0% to 0.6%; vanadium (V): 0% to 0.1%; boron (B): 0% to 0.0025%; and calcium (Ca): 0% to 0.006%. The value of Vs as defined by Vs=C+(Mn/5)+5P−(Ni/10)−(Mo/15)+(Cu/10) is 0.15 to 0.42. P and S among impurities are contained in an amount of not greater than 0.015% and not greater than 0.003%, respectively. The carbide size in the steel is not greater than 5 microns in the longitudinal direction.
摘要翻译：提供了其整个厚度具有优异的韧性，在焊接接头处具有优异性能以及至少约900MPa（130ksi）的拉伸强度（TS））的高强度钢及其制造方法。根据本发明的钢优选具有以重量％计的以下组成：碳（C）：0.02％至0.1％; 硅（Si）：不大于0.6％; 锰（Mn）：0.2〜2.5％镍（Ni）：0.2〜1.2％铌（Nb）：0.01〜0.1％钛（Ti）：0.005〜0.03％铝（Al）：不大于0.1％; 氮（N）：0.001〜0.006％铜（Cu）：0〜0.6％铬（Cr）：0〜0.8％钼（Mo）：0〜0.6％钒（V）：0％至0.1％; 硼（B）：0〜0.0025％和钙（Ca）：0〜0.006％。由Vs = C +（Mn / 5）+ 5P-（Ni / 10） - （Mo / 15）+（Cu / 10）定义的Vs的值为0.15〜0.42。杂质中的P和S的含量分别不大于0.015％且不大于0.003％。钢中的碳化物尺寸在纵向上不大于5微米。

6. 发明授权

US07048810B2 Method of manufacturing hot formed high strength steel 有权
标题翻译：热成型高强度钢的制造方法
公开(公告)号：US07048810B2
公开(公告)日：2006-05-23
申请号：US10253129
申请日：2002-09-24
申请人： Clifford W. Petersen , Jayoung Koo , Narasimha-Rao V. Bangaru , Michael J. Luton
发明人： Clifford W. Petersen , Jayoung Koo , Narasimha-Rao V. Bangaru , Michael J. Luton
IPC分类号： C12D8/10
CPC分类号： C21D1/02 , C21D7/13 , C21D8/00 , C21D2211/002 , C21D2211/008 , Y10S148/909
摘要： A method for processing a hot formed, high-tensile-strength steel having an ultimate tensile strength (UTS) of at least about 730 MPa (105 ksi) and excellent toughness to retain essentially all the strength and toughness is provided. This processing is needed for the fabrication of high strength fittings that are used in the construction of linepipe for transport of natural gas, crude oil, as well as other applications. Furthermore, the hot formed high strength steel may be weldable with a Pcm of less than or equal to 0.35.
摘要翻译：提供了一种用于处理具有至少约730MPa（105ksi）的极限拉伸强度（UTS）和优异韧性以保持基本上所有强度和韧性的热成型的高拉伸强度钢的方法。这种加工是制造用于天然气，原油以及其他应用的运输管线管道中使用的高强度配件所必需的。此外，热成型的高强度钢可以以小于或等于0.35的Pcm可焊接。

7. 发明授权

US07731776B2 Bimodal and multimodal dense boride cermets with superior erosion performance 失效
标题翻译：具有优良侵蚀性能的双峰和多峰密集硼化物金属陶瓷
公开(公告)号：US07731776B2
公开(公告)日：2010-06-08
申请号：US11293728
申请日：2005-12-02
申请人： ChangMin Chun , Narasimha-Rao V. Bangaru , Neeraj S. Thirumalai , Hyun-Woo Jin , Jayoung Koo , John R. Peterson , Robert L. Antram , Christopher J. Fowler , Emery B. Lendvai-Lintner
发明人： ChangMin Chun , Narasimha-Rao V. Bangaru , Neeraj S. Thirumalai , Hyun-Woo Jin , Jayoung Koo , John R. Peterson , Robert L. Antram , Christopher J. Fowler , Emery B. Lendvai-Lintner
IPC分类号： C22C29/14 , B22F3/16
CPC分类号： C22C29/14 , B22F1/0014 , B22F2009/043 , B22F2998/10 , B22F2999/00 , Y10T428/12007 , B22F1/0003 , B22F3/02 , B22F3/1021 , B22F3/1035 , B22F9/04
摘要： Multimodal cermet compositions comprising a multimodal grit distribution of the ceramic phase and method of making are provided by the present invention. The multimodal cermet compositions include a) a ceramic phase and b) a metal binder phase, wherein the ceramic phase is a metal boride with a multimodal distribution of particles, wherein at least one metal is selected from the group consisting of Group IV, Group V, Group VI elements of the Long Form of The Periodic Table of Elements and mixtures thereof, and wherein the metal binder phase comprises at least one first element selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, and at least second element selected from the group consisting of Cr, Al, Si and Y, and Ti. The method of making multimodal boride cermets includes the steps of mixing multimodal ceramic phase particles and metal phase particles, milling the ceramic and metal phase particles, uniaxially and optionally isostatically pressing the particles, liquid phase sintering of the compressed mixture at elevated temperatures, and finally cooling the multimodal cermet composition. Advantages disclosed by the multimodal cermets are high packing density of the ceramic phase, high fracture toughness and improved erosion resistance at high temperatures up to 1000° C. The disclosed multimodal cermets are suitable in high temperature erosion/corrosion applications in various chemical and petroleum environments.
摘要翻译：包含陶瓷相的多峰砂粒分布的多模金属陶瓷组合物及其制造方法由本发明提供。多峰金属陶瓷组合物包括a）陶瓷相和b）金属粘结相，其中所述陶瓷相是具有多峰颗粒分布的金属硼化物，其中至少一种金属选自第IV族，第V族元素周期表的Long形式的VI族元素及其混合物，其中金属粘合剂相包含至少一种选自Fe，Ni，Co，Mn及其混合物的第一元素，至少选自Cr，Al，Si和Y的第二元素和Ti。制备多峰硼化物金属陶瓷的方法包括以下步骤：将多峰陶瓷相颗粒和金属相颗粒混合，研磨陶瓷和金属相颗粒，单轴和任选地等压挤压颗粒，在高温下液相烧结压缩混合物，最后冷却多峰金属陶瓷组合物。多峰金属陶瓷的优点是陶瓷相的高填充密度，高断裂韧性和在高达1000℃的高温下的耐腐蚀性得到改善。所公开的多峰金属陶瓷适用于各种化学和石油环境中的高温侵蚀/腐蚀应用。

8. 发明授权

US06565678B2 Weld metals with superior low temperature toughness for joining high strength, low alloy steels 有权
公开(公告)号：US06565678B2
公开(公告)日：2003-05-20
申请号：US09920894
申请日：2001-08-02
申请人： Douglas P. Fairchild , Jayoung Koo , Narasimha-Rao V. Bangaru , Mario Luis Macia , Danny Lee Beeson , Adnan Ozekcin
发明人： Douglas P. Fairchild , Jayoung Koo , Narasimha-Rao V. Bangaru , Mario Luis Macia , Danny Lee Beeson , Adnan Ozekcin
IPC分类号： C22C3808
CPC分类号： C22C38/02 , B23K35/3066 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/58
摘要： Weld metals suitable for joining high strength, low alloy steels are provided. These weld metals have microstructures of acicular ferrite interspersed in a hard constituent, such as lath martensite, yield strengths of at least about 690 MPa (100 ksi), and DBTTs lower than about −50° C. (−58° F.) as measured by a Charpy energy versus temperature curve. These weld metals include about 0.04 wt % to about 0.08 wt % carbon; about 1.0 wt % to about 2.0 wt % manganese; about 0.2 wt % to about 0.7 wt % silicon; about 0.30 wt % to 0.80 wt % molybdenum; about 2.3 wt % to about 3.5 wt % nickel; about 0.0175 wt % to about 0.0400 wt % oxygen, and at least one additive selected from the group consisting of (i) up to about 0.04 wt % zirconium, and (ii) up to about 0.02 wt % titanium.

9. 发明授权

US6066212A Ultra-high strength dual phase steels with excellent cryogenic temperature toughness 失效
标题翻译：超高强度双相钢，具有优异的低温韧性
公开(公告)号：US6066212A
公开(公告)日：2000-05-23
申请号：US099152
申请日：1998-06-18
申请人： Jayoung Koo , Narasimha-Rao V. Bangaru
发明人： Jayoung Koo , Narasimha-Rao V. Bangaru
IPC分类号： C21D1/02 , C21D1/19 , C21D8/02 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/58
CPC分类号： C21D1/02 , C21D1/19 , C21D8/0226 , C22C38/001 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： An ultra-high strength, weldable, low alloy, dual phase steel with excellent cryogenic temperature toughness in the base plate and in the heat affected zone (HAZ) when welded, having a tensile strength greater than 830 MPa (120 ksi) and a microstructure comprising a ferrite phase and a second phase of predominantly lath martensite and lower bainite, is prepared by heating a steel slab comprising iron and specified weight percentages of some or all of the additives carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon, niobium, vanadium, titanium, aluminum, and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; further reducing the plate in one or more passes in a temperature range below the austenite recrystallization temperature and above the Ar.sub.3 transformation temperature; finish rolling the plate between the Ar.sub.3 transformation temperature and the Ar.sub.1 transformation temperature; quenching the finish rolled plate to a suitable Quench Stop Temperature (QST); and stopping the quenching.
摘要翻译：一种超高强度，可焊接，低合金，双相钢在焊接时在基板和热影响区（HAZ）中具有优异的低温韧性，拉伸强度大于830MPa（120ksi）和显微组织包括铁素体相和主要是板条马氏体和下贝氏体的第二相，通过加热包括铁的钢坯和特定重量百分比的一些或所有添加剂碳，锰，镍，氮，铜，铬，钼，硅，铌，钒，钛，铝和硼; 在奥氏体重结晶的温度范围内，在一次或多次通过时，将板坯还原成板; 在低于奥氏体再结晶温度和高于Ar3转变温度的温度范围内，在一个或多个道次中进一步减少板; 在Ar3转变温度和Ar1转变温度之间对板进行精轧; 将精轧板淬火至合适的淬火停止温度（QST）; 并停止淬火。

10. 发明授权

US09896748B2 Low yield ratio dual phase steel linepipe with superior strain aging resistance 有权
公开(公告)号：US09896748B2
公开(公告)日：2018-02-20
申请号：US13361774
申请日：2012-01-30
申请人： Jayoung Koo , Narasimha-Rao V. Bangaru , Swarupa Soma Bangaru , Hyun-Woo Jin , Adnan Ozekcin , Raghavan Ayer , Douglas P. Fairchild , Danny L. Beeson , Douglas S. Hoyt , James B. LeBleu, Jr. , Shigeru Endo , Mitsuhiro Okatsu , Shinichi Kakihara , Moriyasu Nagae
发明人： Jayoung Koo , Narasimha-Rao V. Bangaru , Hyun-Woo Jin , Adnan Ozekcin , Raghavan Ayer , Douglas P. Fairchild , Danny L. Beeson , Douglas S. Hoyt , James B. LeBleu, Jr. , Shigeru Endo , Mitsuhiro Okatsu , Shinichi Kakihara , Moriyasu Nagae
IPC分类号： C21D8/10 , C22C38/02 , C21D6/00 , C21D8/02 , C21D9/14 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16
CPC分类号： C22C38/02 , C21D6/005 , C21D8/0226 , C21D8/0263 , C21D9/14 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16
摘要： A steel composition and method from making a dual phase steel therefrom. The dual phase steel may have carbon of about 0.05% by weight to about 0.12 wt %; niobium of about 0.005 wt % to about 0.03 wt %; titanium of about 0.005 wt % to about 0.02 wt %; nitrogen of about 0.001 wt % to about 0.01 wt %; silicon of about 0.01 wt % to about 0.5 wt %; manganese of about 0.5 wt % to about 2.0 wt %; and a total of molybdenum, chromium, vanadium and copper less than about 0.15 wt %. The steel may have a first phase consisting of ferrite and a second phase having one or more of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite. A solute carbon content in the first phase may be about 0.01 wt % or less.

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