-
公开(公告)号：EP3476960B1
公开(公告)日：2020-10-21
申请号：EP17815159.3
申请日：2017-06-06
发明人： GOTO Sota , NAKATA Hiroshi , SHIMAMURA Junji
-
公开(公告)号：EP3476960A1
公开(公告)日：2019-05-01
申请号：EP17815159.3
申请日：2017-06-06
发明人： GOTO Sota , NAKATA Hiroshi , SHIMAMURA Junji
IPC分类号： C22C38/00 , C22C38/14 , C22C38/58 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C21D9/08 , C21D9/46
CPC分类号： C22C38/58 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/085 , C21D9/46 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , F16L1/123
摘要： Provided is a hot-rolled steel sheet for a heavy-wall, high-strength line pipe suitable as a line pipe for transportation of natural gas, crude oil, and the like, the steel sheet particularly having a high strength of API X60 to X80 grade (yield strength YS: 415 MPa or greater, tensile strength TS: 520 MPa or greater) and having an excellent base metal portion DWTT property (brittle fracture arrestability). Provided are a welded steel pipe for a heavy-wall, high-strength line pipe formed from the hot-rolled steel sheet and a method for producing the welded steel pipe.
A hot-rolled steel sheet for a heavy-wall, high-strength line pipe, the hot-rolled steel sheet having a chemical composition including, in mass%, C: 0.02 to 0.20%, Mn: 0.80 to 2.10%, Si: 0.01 to 0.50%, P: 0.034% or less, S: 0.0050% or less, Nb: 0.01 to 0.15%, Ti: 0.001 to 0.030%, and Al: 0.001 to 0.080%, the balance being Fe and incidental impurities, the hot-rolled steel sheet having a microstructure in which a main phase is a continuous cooling transformation structure (Zw) and in which {001} α grains in a plane whose normal direction is the sheet width direction constitute an area fraction of 10% or less and have a combined size of 10 µm or less in terms of the area fraction average grain diameter, wherein the hot-rolled steel sheet has a tensile strength of 520 MPa or greater, and, in a drop weight tear test (DWTT), a temperature at which a percent ductile fracture reaches 85% is -25°C or lower.-
公开(公告)号：EP3859026A1
公开(公告)日：2021-08-04
申请号：EP19864846.1
申请日：2019-09-25
摘要： Disclosed is a high strength steel plate for a sour-resistant line pipe that is excellent not only in HIC resistance but also in SSCC resistance under more severe corrosion environments and environments with low hydrogen sulfide partial pressure below 1 bar. The high strength steel plate for a sour-resistant line pipe disclosed herein has: a chemical composition containing C, Si, Mn, P, S, Al, Mo, and Ca, and at least one of Nb or Ti, in predetermined amounts, with the balance being Fe and inevitable impurities; a steel microstructure at 0.25 mm below a surface of the steel plate being a bainite microstructure having a dislocation density of 1.0 × 10 14 to 7.0 × 10 14 (m -2 ); a variation in Vickers hardness at 0.25 mm below the surface of the steel plate being 30 HV or less at 3σ, where σ is a standard deviation; a variation in Vickers hardness in a plate thickness direction being 30 HV or less at 3σ, where σ is a standard deviation; and a tensile strength being 520 MPa or more.
-
4.发明公开
公开(公告)号：EP3950997A1
公开(公告)日：2022-02-09
申请号：EP20779573.3
申请日：2020-03-19
发明人： YASUDA Kyono , SHIMAMURA Junji , MURAOKA Ryuji
摘要： An object is to provide a steel material for line pipes having a heavy wall thickness, a certain compressive strength required for applying the steel material to offshore pipelines, excellent low-temperature toughness, an excellent DWTT property, and excellent collapse resistant performance, a method for producing the steel material for line pipes, a line pipe having the required compressive strength, excellent low-temperature toughness, an excellent DWTT property, and excellent collapse resistant performance, and a method for producing the line pipe.
The steel material for line pipes has a specific composition. The metallic microstructure of the steel material at a 1/8-plate thickness position below the surface includes bainite of an area fraction of 85% or more, polygonal ferrite of an area fraction of 10% or less, and martensite-austenite constituent of an area fraction of 5% or less. The 0.23% compressive strength of a portion of the steel material which extends from the surface to the 1/8-plate thickness position in a transverse direction is 340 MPa or more. The temperature at which a percent ductile fracture of the steel material measured in a DWTT test becomes 85% or more is -10°C or less.-
公开(公告)号：EP3859027A1
公开(公告)日：2021-08-04
申请号：EP19865764.5
申请日：2019-09-25
摘要： Disclosed is a high strength steel plate for a sour-resistant line pipe that is excellent not only in HIC resistance but also in SSCC resistance under more severe corrosion environments and environments with low hydrogen sulfide partial pressure below 1 bar. The high strength steel plate for a sour-resistant line pipe disclosed herein has: a chemical composition containing C, Si, Mn, P, S, Al, Mo, and Ca, and at least one of Nb or Ti, in predetermined amounts, with the balance being Fe and inevitable impurities; a steel microstructure at 0.25 mm below a surface of the steel plate being a bainite microstructure having a dislocation density of 1.0 × 10 14 to 7.0 × 10 14 (m -2 ); a variation in Vickers hardness at 0.25 mm below the surface of the steel plate being 30 HV or less at 3σ, where σ is a standard deviation; and a tensile strength being 520 MPa or more.
-
公开(公告)号：EP3816318A1
公开(公告)日：2021-05-05
申请号：EP19824522.7
申请日：2019-06-25
发明人： SAKAI Ryosuke , KURONUMA Yota , SHIMAMURA Junji , YOKOTA Tomoyuki
摘要： Disclosed is a clad steel plate with further improved low temperature toughness along with excellent HIC resistance while ensuring a tensile strength of 535 MPa or more. A clad steel plate includes: a base steel; and a clad metal made of a corrosion resistant alloy bonded to one surface of the base steel, in which the base steel has: a chemical composition with appropriately controlled values of ACR and P HIC ; and a steel microstructure in which bainite is present in an area fraction of 94 % or more at a 1/2 thickness position in a thickness direction of the base steel, and with an average crystal grain size of 25 µm or less, and shear strength at a bonded interface between the base steel and the cladding metal is 300 MPa or more.
-
公开(公告)号：EP3604584A1
公开(公告)日：2020-02-05
申请号：EP17903712.2
申请日：2017-09-26
发明人： YOKOTA Tomoyuki , SHIMAMURA Junji , OTA Shusaku , TAMURA Yuta , UEOKA Satoshi , HASE Kazukuni
摘要： Disclosed is a high strength steel plate for a sour-resistant line pipe that is excellent not only in HIC resistance but also in SSCC resistance under more severe corrosion environments. The high strength steel plate for a sour-resistant line pipe has: a chemical composition containing, by mass%, C: 0.02 % to 0.08 %, Si: 0.01 % to 0.50 %, Mn: 0.50 % to 1.80 %, P: 0.001 % to 0.015 %, S: 0.0002 % to 0.0015 %, Al: 0.01 % to 0.08 %, and Ca: 0.0005 % to 0.005 %, with the balance being Fe and inevitable impurities; a steel microstructure at 0.5 mm below a surface of the steel plate being a bainite microstructure having a dislocation density of 1.0 × 10 14 to 7.0 × 10 14 (m -2 ); a variation in Vickers hardness at 0.5 mm below the surface of the steel plate being 30 HV or less at 3σ, where σ is a standard deviation; and a tensile strength being 520 MPa or more.
-
-
-
-
-
-
搜索结果
7 条记录 (耗时 0.011 秒)
