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1. 发明公开

EP3009725A4 THREADED JOINT FOR OIL WELL PIPE 有权
标题翻译：螺纹连接片用于油孔管
公开(公告)号：EP3009725A4
公开(公告)日：2016-06-15
申请号：EP14811719
申请日：2014-06-09
申请人： JFE STEEL CORP
发明人： KAWAI TAKAMASA , TAKAHASHI KAZUNARI , CHIKATSUNE HIROSHI , YOSHIKAWA MASAKI , TAKANO JUN , NAGAHAMA TAKUYA , UETA MASATERU , SATO HIDEO , SEKI HARUHIKO , YONEYAMA TSUYOSHI
IPC分类号： E21B17/042 , F16L15/00 , F16L15/06
CPC分类号： E21B17/042 , F16L15/004 , F16L15/06
摘要： In the prior art, only the case where the contact is made on the stabbing flank face 31B is estimated and hence, the prior art has a drawback that when a highly concentrated load acts on the load flank face 30P of the threaded portion on the pin pipe end side, the concentrated load cannot be decreased. In a premium joint, a pitch change is made such that an internally-thread pitch 20B has the same value as an externally-thread pitch 20P from a thread end portion on a box 1 end side to a pitch change position (PCP) taken on a box center side with respect to a position away from the thread end portion by 1/2 of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position (PCP) so that a thread gap 10 is gradually decreased from the pitch change position to a position (PCP) of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap 10 before the pitch change is made.

2. 发明公开

EP2998633A4 THREADED JOINT FOR OIL COUNTRY TUBULAR GOODS 有权
标题翻译：油井管PIPES螺纹接头
公开(公告)号：EP2998633A4
公开(公告)日：2016-08-17
申请号：EP14832228
申请日：2014-07-29
申请人： JFE STEEL CORP
发明人： KAWAI TAKAMASA , TAKAHASHI KAZUNARI , CHIKATSUNE HIROSHI , YOSHIKAWA MASAKI , TAKANO JUN , NAGAHAMA TAKUYA , UETA MASATERU , SATO HIDEO , SEKI HARUHIKO , YONEYAMA TSUYOSHI
IPC分类号： F16L15/04 , E21B17/042 , E21B17/08
CPC分类号： F16L15/06 , E21B17/042 , E21B17/08
摘要： The prior art cannot suppress the plastic deformation of the whole pin distal end when a compressive load is applied, deteriorating durability of threaded joint. Provided is a premium threaded joint where a pin-side shoulder angle ¸1, a box-side shoulder angle ¸2, a seal interference quantity ´ and a seal point distance xp satisfy a relationship expressed by ¸2-¸1=±x´/xp, ±=7 to 14, and a pin distal end thickness tp1 which is defined by a difference Re-Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.

3. 发明公开

EP3121306A4 HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL, AND METHOD FOR PRODUCING SAME 有权
标题翻译：高强度钢管无缝油井和方法及其制造
公开(公告)号：EP3121306A4
公开(公告)日：2017-04-26
申请号：EP15795740
申请日：2015-05-20
申请人： JFE STEEL CORP
发明人： FUJIMURA KAZUKI , ISHIGURO YASUHIDE , NAKAHASHI TETSU , SATO HIDEO
IPC分类号： C22C38/00 , C21D8/10 , C21D9/00 , C21D9/08 , C22C38/58
CPC分类号： C21D9/08 , C21D1/22 , C21D6/004 , C21D8/005 , C21D8/10 , C21D8/105 , C21D9/00 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： Provided are a high-strength seamless stainless steel pipe for oil country tubular goods excellent in terms of hot workability, sulfide stress cracking resistance, and corrosion resistance and a method for manufacturing the steel pipe. The steel pipe has a chemical composition containing Cr and Ni so that the relationship Cr/Ni ‰¤ 5.3 is satisfied and a microstructure including mainly a tempered martensite phase in which a surface layer microstructure includes a phase which looks white when subjected to etching with a Vilella etching solution, which has a thickness in the wall thickness direction from the outer surface of the pipe of 10 µm or more and 100 µm or less, and which disperses in the outer surface of the pipe in an amount of 50% or more in terms of area fraction. The chemical composition may be a chemical composition containing, by mass%, C: 0.005% or more and 0.05% or less, Si: 0.05% or more and 1.50% or less, Mn: 0.2% or more and 1.8% or less, P: 0.02% or less, S: 0.005% or less, Cr: 11% or more and 18% or less, Ni: 0.10% or more and 8.0% or less, Mo: 0.6% or more and 3.5% or less, and the balance being Fe and inevitable impurities.
摘要翻译：提供的是用于油井优异的热加工性，硫化物应力开裂性，和耐腐蚀性和用于钢管的制造方法的术语管状产品的高强度无缝不锈钢管。钢管的化学组成含Cr和Ni所以没有关系的Cr /镍‰¤5.3被满足，并且微结构主要包括一个回火马氏体相，其中，表面层微结构包括一个相位哪个看起来是白色的时，受到与蚀刻 Vilella蚀刻溶液，其具有的厚度为10微米以上，100微米或更小的管的外表面的壁厚方向，并且其分散在管的外表面中在50％或更多的量面积比计。所述化学组合物可以是含有的化学成分，以质量％计，C：0.005％以上且0.05％以下，Si：0.05％以上且1.50％以下，Mn：0.2％以上且1.8％以下， P：0.02％以下，S：0.005％以下，Cr：11％以上且18％以下，Ni：0.10％以上且8.0％以下，Mo：0.6％以上且3.5％以下，和其余为Fe和不可避免的杂质。

4. 发明公开

EP3064818A4 THREADED JOINT FOR ULTRA THICK OIL WELL PIPE 审中-实审
标题翻译：谢拉布丁德·恩·恩·辛格·狄尔斯·ÖLBOHRROHR
公开(公告)号：EP3064818A4
公开(公告)日：2017-03-08
申请号：EP14877606
申请日：2014-10-30
申请人： JFE STEEL CORP
发明人： KAWAI TAKAMASA , TAKAHASHI KAZUNARI , CHIKATSUNE HIROSHI , YOSHIKAWA MASAKI , TAKANO JUN , NAGAHAMA TAKUYA , UETA MASATERU , YONEYAMA TSUYOSHI , SATO HIDEO , SEKI HARUHIKO
IPC分类号： F16L15/04 , E21B17/042
CPC分类号： F16L15/04 , E21B17/042 , F16L15/004 , F16L15/06

5. 发明公开

EP3042968A4 METHOD FOR PRODUCING HIGH-STRENGTH STAINLESS STEEL PIPE, AND HIGH-STRENGTH STAINLESS STEEL PIPE 有权
标题翻译：用于生产高固管不锈钢和高强度管不锈钢
公开(公告)号：EP3042968A4
公开(公告)日：2016-08-31
申请号：EP14842892
申请日：2014-08-04
申请人： JFE STEEL CORP
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE , SUZUKI TAKESHI , SATO HIDEO , NAKAHASHI TETSU
IPC分类号： C21D9/08 , C21D6/00 , C21D6/04 , C21D8/10 , C21D9/14 , C22C38/00 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
CPC分类号： C21D9/08 , B21B19/04 , B21C23/002 , B22D11/002 , C21D1/18 , C21D1/613 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/10 , C21D8/105 , C21D9/085 , C21D9/14 , C21D2211/001 , C21D2211/004 , C21D2211/005 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58
摘要： Provided is a method of manufacturing a high-strength stainless steel pipe having excellent toughness. A method of manufacturing a high-strength stainless steel pipe having excellent toughness, characterized by comprising; forming a steel into a steel pipe having a predetermined size, the steel having a composition comprising by mass% 0.005 to 0.05% C, 0.05 to 1.0% Si, 0.2 to 1.8% Mn, 0.03% or less P, 0.005% or less S, 14 to 20% Cr, 1.5 to 10% Ni, 1 to 5% Mo, 0.5% or less V, 0.15% or less N, 0.01% or less O, 0.002 to 0.1% Al, and Fe and unavoidable impurities as a balance, applying a quenching treatment two times or more to the steel pipe where the steel pipe is quenched by reheating to a temperature of 750°C or above and cooling to a temperature of 100°C or below at a cooling rate equal to or higher than an air-cooling rate, and applying a tempering treatment where the steel pipe is tempered at a temperature of 700°C or below, the final quenching treatment of the quenching treatments being performed by reheating to a temperature at which Ç phase and M 23 C 6 precipitate or above.

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