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1. 发明授权

US08974610B2 High-strength welded steel pipe and method for producing the same 有权
标题翻译：高强度焊接钢管及其制造方法
公开(公告)号：US08974610B2
公开(公告)日：2015-03-10
申请号：US13575051
申请日：2011-02-04
申请人： Taishi Fujishiro , Takuya Hara , Yoshio Terada , Shinya Sakamoto , Hitoshi Asahi
发明人： Taishi Fujishiro , Takuya Hara , Yoshio Terada , Shinya Sakamoto , Hitoshi Asahi
IPC分类号： C21D9/08 , C21D8/10 , C22C38/12 , C22C38/02 , C22C38/04 , F16L31/02 , B23K35/30 , B23K31/02 , C21D9/50 , C22C38/00 , C22C38/14
CPC分类号： B23K35/3053 , B23K31/027 , B23K2101/06 , B23K2103/04 , C21D8/105 , C21D9/08 , C21D9/50 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , Y10S148/909
摘要： A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass %, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N]−[Ti]/3.4 is less than 0.003, the average grain size of the prior γ grains in heat affected zones in the steel plate is 250 μm or less, and the prior γ grains include bainite and intragranular bainite.
摘要翻译：通过焊接形成管状的钢板的焊缝部分来获得高强度焊接钢管。在高强度焊接钢管中，钢板的贱金属以质量％计含有C：0.010〜0.080％，Si：0.01〜0.50％，Mn：0.50〜2.00％，S：0.0001％至0.0050％，Ti：0.003％至0.030％，Mo：0.05％至1.00％，B：0.0003％至0.0100％，O：0.0001％至0.0080％，N：0.006％至0.0118％，P：限于0.050％以下，Al：0.008％以下，Fe和不可避免的杂质余量Ceq为0.30〜0.53，Pcm为0.10〜0.20，[N] - [Ti] /3.4小于0.003，平均粒径钢板的热影响区域的现有γ晶粒的尺寸为250μm以下，原来的γ晶粒包括贝氏体和晶粒内贝氏体。

2. 发明申请

US20120291907A1 HIGH-STRENGTH WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME 有权
标题翻译：高强度焊接钢管及其制造方法
公开(公告)号：US20120291907A1
公开(公告)日：2012-11-22
申请号：US13575051
申请日：2011-02-04
申请人： Taishi Fujishiro , Takuya Hara , Yoshio Terada , Shinya Sakamoto , Hitoshi Asahi
发明人： Taishi Fujishiro , Takuya Hara , Yoshio Terada , Shinya Sakamoto , Hitoshi Asahi
IPC分类号： F16L9/00 , B23K31/02
CPC分类号： B23K35/3053 , B23K31/027 , B23K2101/06 , B23K2103/04 , C21D8/105 , C21D9/08 , C21D9/50 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , Y10S148/909
摘要： A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass %, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N]—[Ti]/3.4 is less than 0.003, the average grain size of the prior γ grains in heat affected zones in the steel plate is 250 μm or less, and the prior γ grains include bainite and intragranular bainite.
摘要翻译：通过焊接形成管状的钢板的焊缝部分来获得高强度焊接钢管。在高强度焊接钢管中，钢板的贱金属以质量％计含有C：0.010〜0.080％，Si：0.01〜0.50％，Mn：0.50〜2.00％，S：0.0001％至0.0050％，Ti：0.003％至0.030％，Mo：0.05％至1.00％，B：0.0003％至0.0100％，O：0.0001％至0.0080％，N：0.006％至0.0118％，P：限于0.050％以下，Al：0.008％以下，Fe和不可避免的杂质余量Ceq为0.30〜0.53，Pcm为0.10〜0.20，[N] - [Ti] /3.4小于0.003，平均粒径钢板的热影响区域的现有γ晶粒的尺寸为250μm以下，原来的γ晶粒包括贝氏体和晶粒内贝氏体。

3. 发明授权

US07736447B2 Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof 有权
标题翻译：具有优异的低温韧性的超高强度线管和超高强度线管用钢板及其制造方法
公开(公告)号：US07736447B2
公开(公告)日：2010-06-15
申请号：US10582830
申请日：2004-12-17
申请人： Hitoshi Asahi , Takuya Hara
发明人： Hitoshi Asahi , Takuya Hara
IPC分类号： C22C38/12 , C22C38/14 , C22C38/04 , C21D8/02 , C21D8/10
CPC分类号： C22C38/12 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/46 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of not more than 0.003 mass %, Ni of 0.1 to 1.5 mass %, Mo of 0.15 to 0.60 mass %, Nb of 0.01 to 0.10 mass %, Ti of 0.005 to 0.030 mass %, Al of not more than 0.06 mass %, one or more of required amounts of B, N, V, Cu, Cr, Ca, REM (rare-earth metals) and Mg, with the remainder consisting of iron and unavoidable impurities and having a (Hv-ave)/(Hv-M) ratio between 0.8 and 0.9 at 2.5≦P≦4.0, wherein Hv-ave is the average Vickers hardness in the direction of the thickness of the base metal and Hv-M is the martensite hardness depending on C-content (Hv-M=270+1300C) and a tensile strength TS-C between 900 MPa and 1100 MPa; P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+(1+β)Mo−1+β (β=1 when B≧3 ppm and β=0 when B
摘要翻译：通过将包含0.03〜0.07质量％的C，不大于0.6质量％的Si，1.5〜2.5质量％的Mn，1.5〜2.5质量％的Mn，不为P的钢板的边缘焊接在一起，制造出优异的低温韧性的超高强度线管大于0.015质量％，S：0.003质量％以下，Ni：0.1〜1.5质量％，Mo：0.15〜0.60质量％，Nb：0.01〜0.10质量％，Ti：0.005〜0.030质量％大于0.06质量％，所需量的B，N，V，Cu，Cr，Ca，REM（稀土金属）和Mg中的一种或多种，其余由铁和不可避免的杂质组成，并具有（Hv- ave）/（Hv-M）在2.5和nlE下的0.8和0.9之间的比值; P＆nlE; 4.0，其中Hv-ave是贱金属厚度方向上的维氏硬度平均值，Hv-M是马氏体硬度，取决于 C含量（Hv-M = 270±1300℃），拉伸强度TS-C在900MPa〜1100MPa之间; P = 2.7C + 0.4Si + Mn + 0.8Cr + 0.45（Ni + Cu）+（1 +＆bgr）Mo-1 +＆bgr; （B≥3ppm时＆Bgr = 1，B≤3ppm时为＆bgr = 0）。

4. 发明授权

US07601231B2 High-strength steel pipe excellent in low temperature toughness and toughness at weld heat-affected zone 有权
标题翻译：焊接热影响区的低温韧性和韧性优良的高强度钢管
公开(公告)号：US07601231B2
公开(公告)日：2009-10-13
申请号：US10444743
申请日：2003-05-23
申请人： Takuya Hara , Hitoshi Asahi
发明人： Takuya Hara , Hitoshi Asahi
IPC分类号： C22C38/04 , C22C38/14 , C22C38/12
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/10 , C21D8/1261 , C21D2211/002 , C21D2211/008 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/58 , Y10S148/909
摘要： A high-strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel are provided. For example, the steel pipe includes elements to enhance hardenability for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding. In the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM, and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo. Such elements enhancing hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method may include heating a casting to a temperature not lower than the Ac3 point, hot rolling such casting, and thereafter cooling the resulting hot-rolled steel plate at a prescribed cooling rate.
摘要翻译：提供了一种现场焊接性优异的高强度钢管和通过提高钢的低温韧性的可靠性来制造钢管的方法。例如，钢管包括提高淬火性的元素，以进一步提高强化强度，并提高经受双层或多层焊接的焊接热影响区的韧性。在该方法中，通过含有规定量的C，Si，Mn，P，S，Ni，Mo，Nb，Ti，Al和N，由贝氏体和/或马氏体构成的结构，由钢构成，作为需要B，V，Cu，Cr，Ca，REM和Mg中的一种或多种，调节C，Si，Mn，Cr，Ni，Cu，V和Mo。这些元素通过具体的关系式提高淬透性。原奥氏体晶粒的直径可以在规定的范围内调节。该方法可以包括将铸件加热到不低于Ac3点的温度，热轧这种铸造，然后以规定的冷却速度冷却所得到的热轧钢板。

5. 发明授权

US5820699A Martensitic stainless steel having excellent hot workability and sulfide stress cracking resistance 失效
标题翻译：具有优异的热加工性和耐硫化物应力开裂性的马氏体不锈钢
公开(公告)号：US5820699A
公开(公告)日：1998-10-13
申请号：US776125
申请日：1997-04-17
申请人： Hitoshi Asahi , Takuya Hara , Akira Kawakami
发明人： Hitoshi Asahi , Takuya Hara , Akira Kawakami
IPC分类号： C21D9/08 , C21D6/00 , C22C38/00 , C22C38/42 , C22C38/44 , C22C38/50
CPC分类号： C21D6/004 , C22C38/42 , C22C38/44 , C21D2211/008
摘要： A martensitic stainless steel capable of developing a tempered martensitic structure, comprising by weight C: 0.005 to 0.05%, Si.ltoreq.0.50%, Mn: 0.1 to 1.0%, P.ltoreq.0.03%, S.ltoreq.0.005%, Mo: 1.0 to 3.0%, Cu: 1.0 to 4.0%, Ni: 5 to 8%, Al.ltoreq.0.06%, Cr and Mo satisfying a requirement represented by the formula Cr+1.6Mo.gtoreq.13; and C, N, Ni, Cu, Cr, and Mo satisfying a requirement represented by the formula Ni(eq): 40C+34N+Ni+0.3Cu-1.1Cr-1.8Mo.gtoreq.-10.5, and optionally at least one member selected from the group consisting of Ti, Zr, Ca, and REM, with the balance consisting essentially of Fe. The present invention provides a martensitic stainless steel having excellent resistance to corrosion by CO.sub.2 and sulfide stress cracking and good hot workability.
摘要翻译： PCT No.PCT / JP95 / 01453 Sec。 371日期1997年04月17日 102（e）日期1997年4月17日PCT提交1995年7月21日PCT公布。出版物WO96 / 03532 日期：1996年2月8日具有显影回火马氏体组织的马氏体系不锈钢，其含量为C：0.005〜0.05％，Si≤0.50％，Mn：0.1〜1.0％，P≤0.03％ /=0.005%，Mo：1.0〜3.0％，Cu：1.0〜4.0％，Ni：5〜8％，Al：0.06％，Cr和Mo满足式Cr + 1.6Mo> 13; 和C，N，Ni，Cu，Cr和Mo满足由式Ni（eq）表示的要求：40℃+ 34N + Ni + 0.3Cu-1.1Cr-1.8Mo> = 10.5，以及任选的至少一种选自Ti，Zr，Ca和REM组成的组分，余量基本上由Fe组成。本发明提供一种马氏体不锈钢，具有优异的耐CO 2腐蚀性和耐硫化应力开裂性以及良好的热加工性。

6. 发明授权

US08070887B2 High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same 有权
标题翻译：可变形性优异的高强度钢板和高强度钢管及其制造方法
公开(公告)号：US08070887B2
公开(公告)日：2011-12-06
申请号：US10410014
申请日：2003-04-09
申请人： Hitoshi Asahi , Yasuhiro Shinohara , Takuya Hara
发明人： Hitoshi Asahi , Yasuhiro Shinohara , Takuya Hara
IPC分类号： C21D9/08 , C22C38/00 , C22C38/18
CPC分类号： C22C38/04 , C21D8/0226 , C21D8/0263 , C21D2211/002 , C21D2211/005 , C22C38/001 , C22C38/02 , C22C38/12 , C22C38/14
摘要： The present invention provides a line pipe of, e.g., the API standard X60 to X100 class. The line pipe has an excellent deformability, as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe. Methods for producing the steel pipe and the steel plate are also provided. In particular, a high-strength steel plate excellent in the deformability has a ferrite phase is dispersed finely, and accounts for 5% to 40% in area percentage in a low temperature transformation structure mainly composed of a bainite phase. For example, most grain sizes of the ferrite phase are smaller than the average grain size of the bainite phase. A high-strength steel pipe excellent in deformability is also provided, in which a large diameter steel pipe is produced through forming the steel plate into a pipe shape. The steel pipe has the above-referenced structure, and satisfies the conditions that YS/TS is 0.95 or less and YS×uEL is 5,000 or more. Methods for producing such steel plate and steel pipe are also provided.
摘要翻译：本发明提供了例如API标准X60至X100类的管线管。线管具有优异的变形性，以及优异的低温韧性和高生产率，用作钢管材料的钢板。还提供了生产钢管和钢板的方法。特别是，在主要由贝氏体相组成的低温转变结构中，变形性优异的高强度钢板的铁素体相分散细小，占面积率的5〜40％。例如，铁素体相的大部分晶粒尺寸小于贝氏体相的平均晶粒尺寸。还提供了一种变形能力优异的高强度钢管，其中通过将钢板形成管状而制造大直径钢管。钢管具有上述结构，满足YS / TS为0.95以下，YS×uEL为5000以上的条件。还提供了生产这种钢板和钢管的方法。

7. 发明授权

US08049131B2 Ultrahigh strength welded joint and ultrahigh strength welded steel pipe excellent in cold cracking resistance of weld metal, and methods for producing the same 有权
标题翻译：焊接金属的耐寒裂纹性优异的超高强度焊接接头和超高强度焊接钢管及其制造方法
公开(公告)号：US08049131B2
公开(公告)日：2011-11-01
申请号：US10898307
申请日：2004-07-23
申请人： Takuya Hara , Hitoshi Asahi
发明人： Takuya Hara , Hitoshi Asahi
IPC分类号： B23K9/18 , B23K25/00
CPC分类号： B23K35/0261 , B23K9/0253 , B23K9/186 , B23K9/23 , B23K35/3066 , B23K2101/06 , B23K2103/04 , Y10T428/12972
摘要： The present invention, in a welded joint of steel sheets and a steel pipe body having a tensile strength of 800 MPa or more (over X100 in API Standards), provides: the welded joint of the steel sheets and the steel pipe produced by forming a steel sheet into a cylindrical shape and welding both the ends thereof, both excellent in cold cracking resistance; and methods for producing them. The present invention includes an ultrahigh strength welded joint and an ultrahigh strength welded steel pipe excellent in the cold cracking resistance of a weld metal, characterized in that the amount of non-diffusible hydrogen in the inner side weld metal is 0.01 ppm or more. It is preferable that the ratio of the non-diffusible hydrogen amount to the total hydrogen amount in said inner side weld metal is 0.5% or more. Further, it is preferable that Mo carbide is contained by not less than 1 piece/μm2 in said inner side weld metal. The present invention also includes a method for producing said welded joint and welded steel pipe, characterized by welding the butted portion from the inner side and thereafter welding it from the outer side so that the reheating temperature of the inner side weld metal may reach within the range from 500° C. to 700° C.
摘要翻译：本发明在钢板焊接接头和抗拉强度为800MPa以上（在API标准中为X100以上）的钢管体中，提供：钢板的焊接接头和通过形成钢板成为圆筒状并焊接其两端，耐寒性均优异; 及其生产方法。本发明包括焊接金属的耐寒裂性优异的超高强度焊接接头和超高强度焊接钢管，其特征在于，内侧焊接金属中的非扩散性氢的量为0.01ppm以上。优选所述内侧焊接金属中的所述非扩散性氢量与所述总氢量的比率为0.5％以上。此外，优选在所述内侧焊接金属中含有不小于1个/μm2的Mo碳化物。本发明还包括一种用于制造所述焊接接头和焊接钢管的方法，其特征在于，从内侧焊接对接部分，然后从外侧焊接，使得内侧焊接金属的再加热温度可达到范围从500°C到700°C

8. 发明申请

US20110250471A1 Ultrahigh strength welded joint and ultrahigh strength welded steel pipe excellent in cold cracking resistance of weld metal, and methods for producing the same 审中-公开
公开(公告)号：US20110250471A1
公开(公告)日：2011-10-13
申请号：US13134781
申请日：2011-06-15
申请人： Takuya Hara , Hitoshi Asahi
发明人： Takuya Hara , Hitoshi Asahi
IPC分类号： B32B15/18
CPC分类号： B23K35/0261 , B23K9/0253 , B23K9/186 , B23K9/23 , B23K35/3066 , B23K2101/06 , B23K2103/04 , Y10T428/12972
摘要： The present invention, in a welded joint of steel sheets and a steel pipe body having a tensile strength of 800 MPa or more (over X100 in API Standards), provides: the welded joint of the steel sheets and the steel pipe produced by forming a steel sheet into a cylindrical shape and welding both the ends thereof, both excellent in cold cracking resistance; and methods for producing them. The present invention includes an ultrahigh strength welded joint and an ultrahigh strength welded steel pipe excellent in the cold cracking resistance of a weld metal, characterized in that the amount of non-diffusible hydrogen in the inner side weld metal is 0.01 ppm or more. It is preferable that the ratio of the non-diffusible hydrogen amount to the total hydrogen amount in said inner side weld metal is 0.5% or more. Further, it is preferable that Mo carbide is contained by not less than 1 piece/μm2 in said inner side weld metal. The present invention also includes a method for producing said welded joint and welded steel pipe, characterized by welding the butted portion from the inner side and thereafter welding it from the outer side so that the reheating temperature of the inner side weld metal may reach within the range from 500° C. to 700° C.

9. 发明申请

US20110023991A1 HIGH STRENGTH STEEL PLATE, STEEL PIPE WITH EXCELLENT LOW TEMPERATURE TOUGHNESS, AND METHOD OF PRODUCTION OF SAME 有权
标题翻译：高强度钢板，具有优异的低温韧性的钢管及其制造方法
公开(公告)号：US20110023991A1
公开(公告)日：2011-02-03
申请号：US12736359
申请日：2009-04-04
申请人： Taishi Fujishiro , Shinya Sakamoto , Takuya Hara , Hitoshi Asahi
发明人： Taishi Fujishiro , Shinya Sakamoto , Takuya Hara , Hitoshi Asahi
IPC分类号： F16L9/02 , C21D11/00 , C22C38/00 , C22C38/32 , C22C38/16 , C22C38/08 , C22C38/04 , C22C38/12 , C22C38/14
CPC分类号： C21D7/12 , B21C37/08 , C21D8/0231 , C21D8/0273 , C21D8/10 , C21D9/08 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , Y10T428/12292 , Y10T428/12653 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972
摘要： The present invention provides high strength steel plate with excellent low temperature toughness, high strength steel pipe using this as a base metal, and methods of production of the same. The steel plate of the present invention contains Mo: 0.05 to 1.00% and B: 0.0003 to 0.0100%, has a Ceq of 0.30 to 0.53, has a Pcm of 0.10 to 0.20, and has a metal structure which has an area percentage of polygonal ferrite of 20 to 90% and has a balance of a hard phase comprised of one or both of bainite and martensite. To obtain this steel plate, strain-introducing rolling is performed with a start temperature of not more than Ar3+60° C., an end temperature of Ar3 or more, and a reduction ratio of 1.5 or more, then the plate is air-cooled and then acceleratedly cooled from Ar3−100° C. to Ar3−10° C. in temperature by 10° C./s or more.
摘要翻译：本发明提供了具有优异的低温韧性的高强度钢板，使用其作为贱金属的高强度钢管及其制造方法。本发明的钢板含有Mo：0.05〜1.00％，B：0.0003〜0.0100％，Ceq为0.30〜0.53，Pcm为0.10〜0.20，金属结构的面积为多边形铁素体为20〜90％，并且具有由贝氏体和马氏体中的一种或两者构成的硬质相的平衡。为了得到该钢板，以Ar3 + 60℃以下的起始温度，Ar3以上的结束温度和1.5以上的压下率进行变形导入轧制，然后冷却，然后在温度10℃/ s以上从Ar3-100℃加速冷却至Ar3-10℃。

10. 发明申请

US20100003535A1 HIGH STRENGTH THICK WELDED STEEL PIPE FOR LINE PIPE SUPERIOR IN LOW TEMPERATURE TOUGHNESS AND METHOD OF PRODUCTION OF THE SAME 有权
标题翻译：用于低温韧性的管线管的高强度厚焊接钢管及其生产方法
公开(公告)号：US20100003535A1
公开(公告)日：2010-01-07
申请号：US12312879
申请日：2007-12-04
申请人： Takuya Hara , Hitoshi Asahi
发明人： Takuya Hara , Hitoshi Asahi
IPC分类号： C22C38/00 , B23K31/02 , B21C37/08 , C22C38/04 , C21D9/08 , B23K9/18 , C22C38/08
CPC分类号： C22C38/02 , B21C37/08 , B23K9/0253 , B23K2101/06 , B23K2103/04 , C21D8/021 , C21D8/0226 , C21D9/08 , C21D9/50 , C21D9/505 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , Y10T428/12292 , Y10T428/12653 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972
摘要： The present invention provides high strength thick welded steel pipe for line pipe superior in low temperature toughness, and a method of production of the same. A base material steel plate containing C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, Al: 0.020% or less, Ti: 0.003 to 0.030%, and Mo: 0.10 to 1.50%, having a carbon equivalent Ceq of 0.30 to 0.53, having a crack susceptability parameter Pcm of 0.10 to 0.20, satisfying formula 3, comprised an area ratio of 20% or less of polygonal ferrite and an area ratio of 80% or more of bainite, and having an effective crystal grain size of 20 μm or less is formed into a pipe shape, then seam welded to make the effective crystal grain size of the heat affected zone 150 μm or less: 10C+100Al+5Mo+5Ni
摘要翻译：本发明提供了具有优异的低温韧性的管线管的高强度厚焊接钢管及其制造方法。将含有C：0.010〜0.050％，Si：0.01〜0.50％，Mn：0.50〜2.00％，Al：0.020％以下，Ti：0.003〜0.030％，Mo：0.10〜1.50％的基材钢板，具有0.30至0.53的碳当量Ceq，其裂纹敏感性参数Pcm为0.10至0.20，满足公式3，其面积比为多边形铁素体的面积比为20％或更小，贝氏体的面积比为80％以上，并且具有将有效的20μm以下的晶粒尺寸形成为管状，然后进行缝焊，使热影响区域的有效晶粒尺寸为150μm以下：10C + 100Al + 5Mo + 5Ni

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