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1. 发明公开

EP2927338A1 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE AND HAVING TENSILE STRENGTH OF AT LEAST 540 MPa 有权
标题翻译： HEISSGEWALZTE STAHLPLATTEFÜREIN HOCHFESTES LEITUNGSROHR MIT EINER ZUGFESTIGKEIT VON MINDESTENS 540 MPA
公开(公告)号：EP2927338A1
公开(公告)日：2015-10-07
申请号：EP14742727.2
申请日：2014-01-23
申请人： JFE Steel Corporation
发明人： GOTO, Sota , TOYODA, Shunsuke , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C22C38/00 , C21D8/02 , C22C38/50
CPC分类号： C21D9/46 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D9/50 , C21D2211/002 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： An object is to provide a hot-rolled steel sheet for a high strength linepipe excellent in terms of HIC resistance which is suitably used as a raw material of a high strength electric resistance welded linepipe of X70 or more in accordance with API standards.
A hot-rolled steel sheet for a high strength linepipe having a tensile strength of 540 MPa or more, the steel sheet having a chemical composition containing, by mass%, C: 0.02% or more and 0.06% or less, Si: 0.05% or more and 0.25% or less, Mn: 0.60% or more and 1.10% or less, P: 0.008% or less, S: 0.0010% or less, Nb: 0.020% or more and 0.060% or less, Ti: 0.001% or more and 0.020% or less, Al: 0.01% or more and 0.08% or less, Ca: 0.0005% or more and 0.0050% or less, one or more selected from among Cu: 0.50% or less, Ni: 0.50% or less, Cr: 0.50% or less, Mo: 0.50% or less, and V: 0.10% or less, and the balance being Fe and inevitable impurities, in which the relationships 0.60 ≤ CP ≤ 0.90 and CM ≤ 3.05 are satisfied.
摘要翻译：本发明的目的是提供一种根据API标准适合用作X70以上的高强度电阻焊管线管的原料的HIC电阻优异的高强度线管的热轧钢板。一种抗拉强度为540MPa以上的高强度线管的热轧钢板，其特征在于，以质量％计含有C：0.02％以上且0.06％以下的化学组成的钢板，Si：0.05％以上且0.25％以下，Mn：0.60％以上且1.10％以下，P：0.008％以下，S：0.0010％以下，Nb：0.020％以上且0.060％以下，Ti：0.001％以上，0.020％以下，Al：0.01％以上且0.08％以下，Ca：0.0005％以上且0.0050％以下，Cu：0.50％以下，Ni：0.50％以下，较小，Cr：0.50％以下，Mo：0.50％以下，V：0.10％以下，余量为Fe和不可避免的杂质，其关系为0.60‰‰CP‰‰0.90和CM‰3.05 满意。

3. 发明公开

EP3239317A1 HIGH-STRENGTH THICK-WALLED ELECTRIC RESISTANCE WELDED STEEL PIPE FOR CONDUCTOR CASING FOR DEEP WELL, PRODUCTION METHOD THEREFOR, AND HIGH-STRENGTH THICK-WALLED CONDUCTOR CASING FOR DEEP WELL 有权
标题翻译：用于深井的导管套的高强度厚壁电阻焊钢管及其生产方法和用于深井的高强度厚壁导管套管
公开(公告)号：EP3239317A1
公开(公告)日：2017-11-01
申请号：EP15872199.3
申请日：2015-12-15
申请人： JFE Steel Corporation
发明人： GOTO, Sota , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C22C38/00 , B21B19/10 , B21C37/08 , C21D8/02 , C21D9/08 , C21D9/50 , C22C38/14 , C22C38/58
摘要： A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided.
A hot-rolled steel plate serving as a material is subjected to roll forming so as to have a generally circular cross section and is subjected to electric resistance welding to form an electric-resistance-welded steel pipe. The electric-resistance-welded portion of the electric-resistance-welded steel pipe is then subjected to in-line heat treatment. The electric-resistance-welded steel pipe is then subjected to reducing rolling such that the circularity of an end portion of the steel pipe is 0.6% or less. The hot-rolled steel plate serving as a material has a composition containing C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less, Nb: 0.010% to 0.100%, and Ti: 0.001% to 0.050% and has a structure composed of 90% or more by volume of a bainitic ferrite phase and 10% or less (including 0%) by volume of a second phase, the bainitic ferrite phase having an average grain size of 10 µm or less, the structure containing fine Nb precipitates having a particle size of less than 20 nm dispersed in a base material portion, the ratio (%) of the fine Nb precipitates to the total amount of Nb being 75% or less on a Nb equivalent basis. The electric-resistance-welded steel pipe can have high strength and toughness and maintain strength through post-weld heat treatment including heating to a temperature of 600°C or more. The electric-resistance-welded steel pipe is less likely to be broken while placed as a deep-well conductor casing.
摘要翻译：提供一种耐焊接后热处理性高的高强度高韧性电阻焊钢管。用作材料的热轧钢板经过辊轧成型以具有大致圆形的横截面并且经受电阻焊接以形成电阻焊接钢管。然后对电阻焊钢管的电阻焊接部分进行在线热处理。然后对电阻焊钢管进行减径轧制，以使钢管端部的圆形度为0.6％以下。作为材料的热轧钢板具有含有C：0.01〜0.12％，Si：0.05〜0.50％，Mn：1.0〜2.2％，P：0.03％以下，S：0.005％或，Al：0.001〜0.10％，N：0.006％以下，Nb：0.010〜0.100％，Ti：0.001〜0.050％，具有贝氏体铁素体相的90体积％以上的组织以及10％以下（包括0％）的第二相，平均粒径为10μm以下的贝氏体铁素体相，含有分散在粒径小于20nm的微细的Nb析出物的组织母材部分中，Nb换算量相对于Nb总量的比例（％）以Nb换算为75％以下。通过加热至600℃以上的温度的焊接后热处理，电阻焊钢管可以具有高强度和韧性并且保持强度。作为深井导体的外壳，电阻焊钢管难以破损。

4. 发明公开

EP3239316A1 HIGH-STRENGTH THICK-WALLED ELECTRIC RESISTANCE WELDED STEEL PIPE FOR CONDUCTOR CASING FOR DEEP WELL, PRODUCTION METHOD THEREFOR, AND HIGH-STRENGTH THICK-WALLED CONDUCTOR CASING FOR DEEP WELL 有权
标题翻译：用于深井的导管套的高强度厚壁电阻焊钢管及其生产方法和用于深井的高强度厚壁导管套管
公开(公告)号：EP3239316A1
公开(公告)日：2017-11-01
申请号：EP15872198.5
申请日：2015-12-15
申请人： JFE Steel Corporation
发明人： GOTO, Sota , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C22C38/00 , B21C37/08 , C21D8/02 , C21D9/08 , C21D9/50 , C22C38/14 , C22C38/58
CPC分类号： C21D9/50 , B21B19/14 , B21B23/00 , B21C37/08 , B23K11/0873 , B23K2101/06 , B23K2103/04 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/02 , C21D8/0205 , C21D8/0263 , C21D9/08 , C21D9/46 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , F16L9/17
摘要： A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided.
A hot-rolled steel plate serving as a material is subjected to roll forming so as to have a generally circular cross section and is subjected to electric resistance welding to form an electric-resistance-welded steel pipe. The electric-resistance-welded portion of the electric-resistance-welded steel pipe is then subjected to in-line heat treatment. The electric-resistance-welded steel pipe is then subjected to reducing rolling such that the circularity of an end portion of the steel pipe is 0.6% or less. The hot-rolled steel plate serving as a material has a composition containing C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less, Nb: 0.010% to 0.100%, and Ti: 0.001% to 0.050% and has a structure composed of 90% or more by volume of a bainitic ferrite phase as a main phase and 10% or less (including 0%) by volume of a second phase, the bainitic ferrite phase having an average grain size of 10 µm or less, the structure containing fine Nb precipitates having a particle size of less than 20 nm dispersed in a base material portion, the ratio (%) of the fine Nb precipitates to the total amount of Nb being more than 75% on a Nb equivalent basis. A thick-walled electric-resistance-welded steel pipe thus manufactured can have high strength and toughness and high resistance to post-weld heat treatment and is less likely to be broken while placed as a deep-well conductor casing.
摘要翻译：提供一种耐焊接后热处理性高的高强度高韧性电阻焊钢管。用作材料的热轧钢板经过辊轧成型以具有大致圆形的横截面并且经受电阻焊接以形成电阻焊接钢管。然后对电阻焊钢管的电阻焊接部分进行在线热处理。然后对电阻焊钢管进行减径轧制，以使钢管端部的圆形度为0.6％以下。作为材料的热轧钢板具有含有C：0.01〜0.12％，Si：0.05〜0.50％，Mn：1.0〜2.2％，P：0.03％以下，S：0.005％或，Al：0.001〜0.10％，N：0.006％以下，Nb：0.010〜0.100％，Ti：0.001〜0.050％，具有贝氏体铁素体相的90体积％以上的组织作为主相且含有10％以下（包含0％）的第2相的平均结晶粒径为10μm以下的贝氏体铁素体相，含有粒径小于20μm的微细Nb析出物的组织 nm分散在基材部分中的情况下，以Nb当量为基准，微细Nb析出物相对于Nb总量的比例（％）大于75％。如此制造的厚壁电阻焊钢管可以具有高强度和韧性，并且对焊接后热处理具有高耐受性，并且在作为深井导体外壳放置时不太可能被破坏。

5. 发明授权

EP2927338B1 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE AND HAVING TENSILE STRENGTH OF AT LEAST 540 MPa 有权
标题翻译：热轧板高强度管材具有至少540 MPA的抗拉强度
公开(公告)号：EP2927338B1
公开(公告)日：2016-11-02
申请号：EP14742727.2
申请日：2014-01-23
申请人： JFE Steel Corporation
发明人： GOTO, Sota , TOYODA, Shunsuke , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C21D9/50 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
CPC分类号： C21D9/46 , C21D8/02 , C21D8/0205 , C21D8/0226 , C21D9/50 , C21D2211/002 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50

7. 发明授权

EP2927339B1 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE 有权
标题翻译：热轧板为高强度PIPES
公开(公告)号：EP2927339B1
公开(公告)日：2016-11-02
申请号：EP14743980.6
申请日：2014-01-23
申请人： JFE Steel Corporation
发明人： GOTO, Sota , TOYODA, Shunsuke , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50

8. 发明公开

EP2927339A1 HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE 有权
标题翻译： HEISSGEWALZTES STAHLBLECHFÜRHOCHFESTE LEITUNGSROHRE
公开(公告)号：EP2927339A1
公开(公告)日：2015-10-07
申请号：EP14743980.6
申请日：2014-01-23
申请人： JFE Steel Corporation
发明人： GOTO, Sota , TOYODA, Shunsuke , OKABE, Takatoshi , OKAZAKI, Yukihiko
IPC分类号： C22C38/00 , C21D8/02 , C22C38/50
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： Provided is an electric resistance welded steel pipe for a high strength linepipe excellent in terms of HIC resistance.
A hot-rolled steel sheet for a high strength linepipe, the steel sheet having a chemical composition containing, by mass%, C: 0.02% or more and 0.06% or less, Si: 0.05% or more and 0.25% or less, Mn: 0.60% or more and 1.10% or less, P: 0.008% or less, S: 0.0010% or less, Nb: 0.010% or more and 0.060% or less, Ti: 0.001% or more and 0.020% or less, Mo: 0.05% or less, Cr: 0.05% or more and 0.50% or less, Al: 0.01% or more and 0.08% or less, Ca: 0.0005% or more and 0.0050% or less, O: 0.005% or less, one or more selected from among Cu: 0.50% or less, Ni: 0.50% or less, and V: 0.10% or less, and the balance being Fe and inevitable impurities, and a metallic structure composed of bainitic-ferrite, in which expression (1) below is satisfied, and in which the ratio of the hardness of a center segregation part to the hardness of a non-segregation part is less than 1.20. SP ≤ 1.90
where SP is derived from SP = Mn + Mo + 11.3 × C + 0.29 × (Cu + Ni) + 0.60 × Cr + 0.88 × V, and where atomic symbols in the equation respectively represent the contents (mass%) of the corresponding chemical elements.
摘要翻译：本发明提供一种耐HIC电阻优异的高强度线管的电阻焊钢管。一种高强度线管的热轧钢板，其特征在于，以质量％计含有C：0.02％以上且0.06％以下，Si：0.05％以上且0.25％以下的化学组成的钢板，Mn ：0.60％以上且1.10％以下，P：0.008％以下，S：0.0010％以下，Nb：0.010％以上且0.060％以下，Ti：0.001％以上且0.020％以下，Mo ：0.05％以下，Cr：0.05％以上且0.50％以下，Al：0.01％以上且0.08％以下，Ca：0.0005％以上且0.0050％以下，O：0.005％以下，1 或更多选自Cu：0.50％以下，Ni：0.50％以下，V：0.10％以下，余量由Fe和不可避免的杂质构成，以及由贝氏体铁素体构成的金属结构体， 1），其中中心偏析部分的硬度与非偏析部分的硬度之比小于1.20。 SP‰¤1.90其中SP来自SP = Mn + Mo + 11.3×C + 0.29×（Cu + Ni）+ 0.60×Cr + 0.88×V，其中原子符号分别表示含量（质量％）的相应化学元素。

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