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1. 发明申请

US20090301613A1 Low Yield Ratio Dual Phase Steel Linepipe with Superior Strain Aging Resistance 审中-公开
标题翻译：低屈服比双相钢管线，具有优异的抗老化性能
公开(公告)号：US20090301613A1
公开(公告)日：2009-12-10
申请号：US12418767
申请日：2009-04-06
申请人： Jayoung Koo , 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 , 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
IPC分类号： C21D9/08 , C21D8/02 , C21D1/70 , C22C38/00 , C22C38/08
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.
摘要翻译：从其制造双相钢的钢组合物和方法。双相钢可以具有约0.05重量％至约0.12重量％的碳; 约0.005重量％至约0.03重量％的铌; 约0.005重量％至约0.02重量％的钛; 约0.001重量％至约0.01重量％的氮; 约0.01重量％至约0.5重量％的硅; 约0.5重量％至约2.0重量％的锰; 以及少于约0.15重量％的钼，铬，钒和铜的总和。钢可以具有由铁素体构成的第一相和具有碳化物，珠光体，马氏体，下贝氏体，粒状贝氏体，上贝氏体和退化的上贝氏体中的一种或多种的第二相。第一相中的溶质碳含量可以为约0.01重量％以下。

2. 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.

3. 发明申请

US20120125490A1 LOW YIELD RATIO DUAL PHASE STEEL LINEPIPE WITH SUPERIOR STRAIN AGING RESISTANCE 有权
标题翻译：具有超耐应变抗老化性能的低合金钢双相钢带
公开(公告)号：US20120125490A1
公开(公告)日：2012-05-24
申请号：US13361774
申请日：2012-01-30
申请人： Jayoung Koo , Swarupa 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 , Swarupa 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 , C21D9/08 , C21D8/02
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.
摘要翻译：从其制造双相钢的钢组合物和方法。双相钢可以具有约0.05重量％至约0.12重量％的碳; 约0.005重量％至约0.03重量％的铌; 约0.005重量％至约0.02重量％的钛; 约0.001重量％至约0.01重量％的氮; 约0.01重量％至约0.5重量％的硅; 约0.5重量％至约2.0重量％的锰; 以及少于约0.15重量％的钼，铬，钒和铜的总和。钢可以具有由铁素体构成的第一相和具有碳化物，珠光体，马氏体，下贝氏体，粒状贝氏体，上贝氏体和退化的上贝氏体中的一种或多种的第二相。第一相中的溶质碳含量可以为约0.01重量％以下。

4. 发明申请

US20090120541A1 High-Strength Steel Plate, Method of Producing the Same, and High-Strength Steel Pipe 有权
标题翻译：高强度钢板及其制造方法，高强度钢管
公开(公告)号：US20090120541A1
公开(公告)日：2009-05-14
申请号：US11887018
申请日：2006-03-30
申请人： Junji Shimamura , Shigeru Endo , Mitsuhiro Okatsu
发明人： Junji Shimamura , Shigeru Endo , Mitsuhiro Okatsu
IPC分类号： C21D8/10 , C22C38/50
CPC分类号： C21D8/0205 , C21D8/02 , C21D2211/005 , C22C38/002 , C22C38/005 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： The present invention provides a high-strength steel plate having excellent resistance to cutting crack, excellent Charpy absorbed energy, excellent DWTT properties, a low yield ratio, and a tensile strength of 900 MPa or more, a method of producing the steel plate, and a high-strength steel pipe using the steel plate. As solving means, a steel plate contains, by % by mass, 0.03 to 0.12% of C, 0.01 to 0.5% of Si, 1.5 to 3% of Mn, 0.01 to 0.08% of Al, 0.01 to 0.08% of Nb, 0.005 to 0.025% of Ti, 0.001 to 0.01% of N, and at least one component of 0.01 to 2% of Cu, 0.01 to 3% of Ni, 0.01 to 1% of Cr, 0.01 to 1% of Mo, and 0.01 to 0.1% of V; wherein the contents of Ca, O, and S satisfy the equation below; the microstructure includes ferrite and a second hard phase, the area fraction of ferrite being 10 to 50%; cementite in the second phase has an average grin size of 0.5 μm or less; and the total amount of Nb and the like contained in carbides thereof present in steel is 10% or less of the total content in steel. 1≦(1−130×[O])×[Ca]/(1.25×[S])≦3 (1)
摘要翻译：本发明提供一种耐切割裂纹性优良的夏比吸收能，优异的DWTT性能，低屈服比，900MPa以上的拉伸强度的高强度钢板，钢板的制造方法和使用钢板的高强度钢管。作为解决方法，钢板以质量％计含有C：0.03〜0.12％，Si：0.01〜0.5％，Mn：1.5〜3％，Al：0.01〜0.08％，Nb：0.01〜0.08％至0.025％的Ti，0.001〜0.01％的N，以及0.01〜2％的Cu，0.01〜3％的Ni，0.01〜1％的Cr，0.01〜1％的Mo和0.01〜 0.1％V; 其中Ca，O和S的含量满足下式：微结构包括铁素体和第二硬质相，铁素体的面积率为10〜50％。第二阶段的渗碳体的平均粗细大小为0.5μm以下; 钢中存在的碳化物中所含的Nb等的总量等于钢中的总含量的10％以下。 1 <=（1-130x [O]）x [Ca] /（1.25x [S]）<= 3（1））<？in-line-formula description =“In-line Formulas”end =“tail”？>

5. 发明授权

US08758528B2 High-strength steel plate, method of producing the same, and high-strength steel pipe 有权
标题翻译：高强度钢板及其制造方法，高强度钢管
公开(公告)号：US08758528B2
公开(公告)日：2014-06-24
申请号：US11887018
申请日：2006-03-30
申请人： Junji Shimamura , Shigeru Endo , Mitsuhiro Okatsu
发明人： Junji Shimamura , Shigeru Endo , Mitsuhiro Okatsu
IPC分类号： C22C38/00 , C22C38/08 , C21D9/08 , C21D8/00
CPC分类号： C21D8/0205 , C21D8/02 , C21D2211/005 , C22C38/002 , C22C38/005 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： The present invention provides a high-strength steel plate having excellent resistance to cutting crack, excellent Charpy absorbed energy, excellent DWTT properties, a low yield ratio, and a tensile strength of 900 MPa or more, a method of producing the steel plate, and a high-strength steel pipe using the steel plate. As solving means, a steel plate contains, by % by mass, 0.03 to 0.12% of C, 0.01 to 0.5% of Si, 1.5 to 3% of Mn, 0.01 to 0.08% of Al, 0.01 to 0.08% of Nb, 0.005 to 0.025% of Ti, 0.001 to 0.01% of N, and at least one component of 0.01 to 2% of Cu, 0.01 to 3% of Ni, 0.01 to 1% of Cr, 0.01 to 1% of Mo, and 0.01 to 0.1% of V; wherein the contents of Ca, O, and S satisfy the equation below; the microstructure includes ferrite and a second hard phase, the area fraction of ferrite being 10 to 50%; cementite in the second phase has an average grin size of 0.5 μm or less; and the total amount of Nb and the like contained in carbides thereof present in steel is 10% or less of the total content in steel. 1≦(1−130×[O])×[Ca]/(1.25×[S])≦3 (1)
摘要翻译：本发明提供一种耐切割裂纹性优良的夏比吸收能，优异的DWTT性能，低屈服比，900MPa以上的拉伸强度的高强度钢板，钢板的制造方法和使用钢板的高强度钢管。作为解决方法，钢板以质量％计含有C：0.03〜0.12％，Si：0.01〜0.5％，Mn：1.5〜3％，Al：0.01〜0.08％，Nb：0.01〜0.08％至0.025％的Ti，0.001〜0.01％的N，以及0.01〜2％的Cu，0.01〜3％的Ni，0.01〜1％的Cr，0.01〜1％的Mo和0.01〜 0.1％V; 其中Ca，O和S的含量满足下式：微结构包括铁素体和第二硬质相，铁素体的面积率为10〜50％。第二相中的渗碳体的平均粗细尺寸为0.5μm以下; 钢中存在的碳化物中所含的Nb等的总量等于钢中的总含量的10％以下。 1＆nlE;（1-130×[O]）×[Ca] /（1.25×[S]）＆nlE; 3（1）

6. 发明申请

US20120018028A1 HIGH STRENGTH STEEL PIPE FOR LOW-TEMPERATURE USAGE HAVING EXCELLENT BUCKLING RESISTANCE AND TOUGHNESS OF WELDED HEAT AFFECTED ZONE AND METHOD FOR PRODUCING THE SAME 有权
标题翻译：用于具有优异的耐磨性和焊接加热区域的韧性的低温用钢的高强度钢管及其制造方法
公开(公告)号：US20120018028A1
公开(公告)日：2012-01-26
申请号：US13147992
申请日：2010-02-05
申请人： Junji Shimamura , Nobuyuki Ishikawa , Mitsuhiro Okatsu , Nobuo Shikanai
发明人： Junji Shimamura , Nobuyuki Ishikawa , Mitsuhiro Okatsu , Nobuo Shikanai
IPC分类号： F16L9/14 , C21D8/10 , C21D8/02
CPC分类号： B23K9/18 , B21C37/08 , B23K9/0253 , B23K9/23 , B23K35/30 , B23K2101/06 , B23K2103/04 , C21D6/005 , C21D8/0205 , C21D8/0226 , C21D8/0247 , C21D8/10 , C21D8/105 , C21D9/08 , C21D9/50 , C21D2211/002 , C21D2211/008 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , Y10T428/12951 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972
摘要： An APIX100-grade high strength steel pipe includes a base material containing, in mass percentage, C: more than 0.03% and 0.08% or less, Si: 0.01% to 0.5%, Mn: 1.5% to 3.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01% to 0.08%, Nb: 0.005% to 0.025%, Ti: 0.005% to 0.025%, N: 0.001% to 0.010%, O: 0.005% or less, and B: 0.0003% to 0.0020%, further contains one or more of Cu, Ni, Cr, Mo, and V, satisfies 0.19≦Pcm≦0.25, the balance being Fe and unavoidable impurities, and has a TS of 760 to 930 MPa, a uniform elongation of 5% or more, and a YR of 85% or less; the seam weld metal has a specific composition.
摘要翻译： APIX100级高强度钢管包括以质量％计含有C：大于0.03％和0.08％或更少的Si：0.01％至0.5％，Mn：1.5％至3.0％，P：0.015％以下，S：0.005％以下，Al：0.01〜0.08％，Nb：0.005〜0.025％，Ti：0.005〜0.025％，N：0.001〜0.010％，O：0.005％以下， B：0.0003〜0.0020％，进一步含有Cu，Ni，Cr，Mo，V中的一种以上，满足0.19＆nlE; Pcm＆nlE; 0.25，余量为Fe和不可避免的杂质，TS为760〜930MPa ，均匀伸长率为5％以上，YR为85％以下; 缝焊金属具有特定的组成。

7. 发明授权

US06299710B1 Method of producing a bainite steel product 失效
标题翻译：生产贝氏体钢产品的方法
公开(公告)号：US06299710B1
公开(公告)日：2001-10-09
申请号：US09272572
申请日：1999-03-19
申请人： Noritsugu Itakura , Mitsuhiro Okatsu , Fumimaru Kawabata , Keniti Amano
发明人： Noritsugu Itakura , Mitsuhiro Okatsu , Fumimaru Kawabata , Keniti Amano
IPC分类号： C21D800
CPC分类号： C21D8/0226 , C21D8/0263 , C21D2211/002 , C22C38/04 , C22C38/12
摘要： A high-strength and high-toughness steel product having at least about 0.001% and less than about 0.030% by weight C, not more than about 0.60% by weight Si, from about 0.8% to 3.0% by weight Mn, from about 0.005 to 0.20% by weight Nb, from about 0.0003 to 0.0050% by weight B, and not more than about 0.005% by weight AL wherein at least 90% of the product has a bainite structure. A method of making this steel product is subject to less stringent production controls because of the nature of the composition.
摘要翻译：具有至少约0.001％且小于约0.030％（重量）C，不超过约0.60％（重量）Si，约0.8％至3.0％（重量）的Mn，约0.005 至0.20重量％的Nb，约0.0003至0.0050重量％的B和不超过约0.005重量％的AL，其中至少90％的产物具有贝氏体组织。由于组合物的性质，制造该钢产品的方法受到较不严格的生产控制。

8. 发明授权

US08124247B2 High-strength welded steel pipe including weld metal having high cold-cracking resistance and method for manufacturing the same 有权
标题翻译：具有耐寒裂性高的焊接金属的高强度焊接钢管及其制造方法
公开(公告)号：US08124247B2
公开(公告)日：2012-02-28
申请号：US12593455
申请日：2008-03-19
申请人： Naoya Hayakawa , Fumimaru Kawabata , Shuichi Sakaguchi , Mitsuhiro Okatsu , Makoto Ota , Shigeki Nishiyama , Kaoru Nagatani , Keito Ishizaki
发明人： Naoya Hayakawa , Fumimaru Kawabata , Shuichi Sakaguchi , Mitsuhiro Okatsu , Makoto Ota , Shigeki Nishiyama , Kaoru Nagatani , Keito Ishizaki
IPC分类号： B32B15/04 , B32B15/18 , B23K9/18 , B23K25/00
CPC分类号： C22C38/02 , B23K35/0266 , B23K35/0272 , B23K35/3066 , C22C38/04 , C22C38/08 , C22C38/12 , F16L13/02 , Y10T428/12292 , Y10T428/12965 , Y10T428/12972
摘要： A high-strength steel pipe has a tensile strength of 800 MPa or more and includes a weld metal having high cold-cracking resistance and high low-temperature toughness, wherein the weld metal contains C: 0.04% to 0.09% by mass, Si: 0.32% to 0.50% by mass, Mn: 1.4% to 2.0% by mass, Cu: less than 0.5% by mass, Ni: more than 0.9% by mass but not more than 4.2% by mass, Mo: 0.4% to 1.5% by mass, Cr: less than 0.5% by mass, V: less than 0.2% by mass, and the remainder of Fe and incidental impurities, and CS values calculated from the weld metal components using the equation CS=5.1+1.4[Mo]−[Ni]−[Mn]−36.3[C] are equal to zero or more at both an internal surface and an external surface.
摘要翻译：高强度钢管的拉伸强度为800MPa以上，并且具有耐寒裂性高，低温韧性高的焊接金属，其中，焊接金属含有C：0.04〜0.09质量％，Si： 0.32〜0.50质量％，Mn：1.4〜2.0质量％，Cu：小于0.5质量％，Ni：0.9质量％以上且4.2质量％以下，Mo：0.4〜1.5 质量％：Cr：小于0.5质量％，V：小于0.2质量％，剩余的Fe和附带的杂质，以及由焊接金属成分使用CS = 5.1 + 1.4 [Mo ] - [Ni] - [Mn] -36.3 [C]在内表面和外表面均等于零或更多。

9. 发明申请

US20100119861A1 HIGH-STRENGTH WELDED STEEL PIPE INCLUDING WELD METAL HAVING HIGH COLD-CRACKING RESISTANCE AND METHOD FOR MANUFACTURING THE SAME 有权
标题翻译：高强度焊接钢管，包括具有高耐寒性的焊接金属及其制造方法
公开(公告)号：US20100119861A1
公开(公告)日：2010-05-13
申请号：US12593455
申请日：2008-03-19
申请人： Naoya Hayakawa , Fumimaru Kawabata , Shuichi Sakaguchi , Mitsuhiro Okatsu , Makoto Ota , Shigeki Nishiyama , Kaoru Nagatani , Keito Ishizaki
发明人： Naoya Hayakawa , Fumimaru Kawabata , Shuichi Sakaguchi , Mitsuhiro Okatsu , Makoto Ota , Shigeki Nishiyama , Kaoru Nagatani , Keito Ishizaki
IPC分类号： B23K9/18 , B21C1/00
CPC分类号： C22C38/02 , B23K35/0266 , B23K35/0272 , B23K35/3066 , C22C38/04 , C22C38/08 , C22C38/12 , F16L13/02 , Y10T428/12292 , Y10T428/12965 , Y10T428/12972
摘要： A high-strength steel pipe having a tensile strength of 800 MPa or more that includes a weld metal having high cold-cracking resistance and high low-temperature toughness is provided. The high-strength steel pipe is a high-strength welded steel pipe in which the welded steel pipe is manufactured by double one layer submerged arc welding performed on an internal surface and an external surface of a base metal, both the base metal of the welded steel pipe and a weld metal have a tensile strength of 800 MPa or more, the weld metal contains C: 0.04% to 0.09% by mass, Si: 0.32% to 0.50% by mass, Mn: 1.4% to 2.0% by mass, Cu: less than 0.5% by mass, Ni: more than 0.9% by mass but not more than 4.2% by mass, Mo: 0.4% to 1.5% by mass, Cr: less than 0.5% by mass, V: less than 0.2% by mass, and the remainder of Fe and incidental impurities, and CS values calculated from the weld metal components using the equation CS=5.1+1.4[Mo]−[Ni]−0.6[Mn]−36.3[C] are equal to zero or more at both the internal surface and the external surface.
摘要翻译：提供一种抗拉强度为800MPa以上的高强度钢管，其包括耐寒裂纹性高，低温韧性高的焊接金属。高强度钢管是一种高强度焊接钢管，其中焊接钢管是通过在基体金属的内表面和外表面上进行的双层埋弧焊而制造的，焊接的钢管钢管和焊接金属的拉伸强度为800MPa以上，焊接金属含有C：0.04〜0.09质量％，Si：0.32〜0.50质量％，Mn：1.4〜2.0质量％ Cu：小于0.5质量％，Ni：大于0.9质量％且不超过4.2质量％，Mo：0.4〜1.5质量％，Cr：小于0.5质量％，V：小于0.2 质量％，剩余的Fe和杂质以及使用CS = 5.1 + 1.4 [Mo] - [Ni] -0.6 [Mn] -36.3 [C]的焊接金属成分计算出的CS值等于在内表面和外表面上都为零或更多。

10. 发明授权

US5989366A Method of manufacturing thick steel product of high strength and high toughness having excellent weldability and minimal variation of structure and physical properties 失效
标题翻译：制造具有优异的焊接性和最小的结构和物理变化的高强度和高韧性的厚钢产品的方法
公开(公告)号：US5989366A
公开(公告)日：1999-11-23
申请号：US816418
申请日：1997-03-14
申请人： Tohru Hayashi , Mitsuhiro Okatsu , Fumimaru Kawabata , Keniti Amano
发明人： Tohru Hayashi , Mitsuhiro Okatsu , Fumimaru Kawabata , Keniti Amano
IPC分类号： C21D8/00 , C21D8/02 , C22C38/00 , C22C38/04 , C22C38/14 , C22C38/58
CPC分类号： C22C38/04 , C21D8/0226
摘要： A method of manufacturing a thick steel product of high strength and high toughness having excellent weldability with minimal variation of material properties, comprises heating a steel raw material to the temperature of Ac.sub.3 to 1350.degree. C., hot rolling and then cooling at the cooling rate of 10.degree. C./sec. or less. The steel raw material has the following composition:C: 0.001-0.25 wt %;Mn: 1.0-3.0 wt %;Ti: 0.005-0.20 wt %;Nb: 0.005-0.20 wt %;B: 0.0003-0.0050 wt %; andAl: 0.01-0.100 wt %balance substantially Fe and incidental impurities. The composition has a transformation start temperature (Bs) of 670.degree. C. or less. Since the steel product obtained by the method has no variation in physical properties regardless of variation in cooling rate, it is possible to supply steel products of high strength and high toughness which have uniform microstructure and properties along their thickness direction and are excellent in weldability.
摘要翻译：一种制造具有优异的焊接性和优异的材料特性的高强度和高韧性的粗钢产品的方法包括将钢原料加热至Ac 3至1350℃的温度，然后以冷却速度冷却，然后冷却为10℃/秒。或更少。钢原料具有以下组成：C：0.001-0.25重量％; Mn：1.0-3.0重量％ Ti：0.005〜0.20重量％ Nb：0.005-0.20重量％ B：0.0003-0.0050重量％和Al：0.01-0.100重量％，基本上为Fe和附带的杂质。组合物的转变开始温度（Bs）为670℃以下。由于通过该方法获得的钢产品与冷却速度的变化无关，物理性质没有变化，因此可以提供具有均匀的组织和性能的厚度方向的高强度，高韧性的钢产品，并且焊接性优异。

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