公开(公告)号：EP2947167A4

公开(公告)日：2016-01-13

申请号：EP14740356

申请日：2014-01-14

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE

IPC: C21D1/22 ,  C21D8/10 ,  C21D9/08 ,  C21D9/14 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

CPC classification number: C21D9/14 ,  C21D1/22 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/08 ,  C21D2211/001 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  E21B17/00

公开(公告)号：EP2728030A4

公开(公告)日：2015-09-02

申请号：EP12805050

申请日：2012-06-29

Applicant: JFE STEEL CORP

Inventor： ISHIGURO YASUHIDE ,  KIMURA MITSUO ,  EGUCHI KENICHIRO ,  YOKOGAWA HIROSHI ,  KATAGIRI TADAO ,  TANAKA MASAHITO

IPC: C22C38/00 ,  C21D1/18 ,  C21D3/04 ,  C21D9/08 ,  C22C38/14 ,  C22C38/58

CPC classification number: C21D9/085 ,  C21D1/25 ,  C21D1/63 ,  C21D8/105 ,  C21D2261/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/40 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  F16L9/02

Abstract: A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the wickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less. In order to achieve this, surface layers are ground from surfaces by a depth of 0.3 mm or more in a wall thickness direction after the quenching treatment, or the quenching treatment is designed to include holding a heating temperature equal to or higher than the Ac3 transformation point for 120 seconds or more in an air atmosphere and then performing water-cooling in a nucleate boiling region or performing water-cooling in a film boiling region and then in a nucleate boiling region. As a result of this quenching treatment, the hardness of the surface layers decreases to 250 HV5 or less and a steel pipe that has an M-shape hardness distribution in which the maximum hardness appears at some point in the profile other than the center of the wall or a U-shape hardness distribution in which the hardness of the surface layers is the highest but not more than 250 HV5 or a flat shape hardness distribution can be obtained. As a result, the sour resistance is significantly improved.

公开(公告)号：EP2447386A4

公开(公告)日：2016-06-15

申请号：EP10792232

申请日：2010-06-23

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  TANAKA YUJI ,  KIMURA MITSUO ,  ISHIGURO YASUHIDE ,  YAMADA KATSUMI ,  NAKAMICHI HARUO

IPC: C22C38/00 ,  C21D9/08 ,  C21D9/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/14 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: Provided is a high-strength seamless steel tube, having excellent resistance to sulfide stress cracking (SSC resistance), for oil wells. In particular, the seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.

公开(公告)号：EP2918697A4

公开(公告)日：2016-03-09

申请号：EP13864497

申请日：2013-12-19

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE

IPC: C22C38/00 ,  C21D1/18 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C21D11/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/08 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/085 ,  C21D11/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: [Solution to Problem] On a percent by mass basis, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% to 1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 15.5% to 17.5%, Ni: 3.0% to 6.0%, Mo: 1.5% to 5.0%, Cu: 4.0% or less, W: 0.1% to 2.5%, and N: 0.15% or less are contained in such a way that -5.9 x (7.82 + 27C - 0.91Si + 0.21Mn - 0.9Cr + Ni - 1.1Mo + 0.2Cu + 11N) ‰¥ 13.0 is satisfied. Consequently, a high-strength stainless steel seamless tube or pipe having excellent corrosion resistance can be produced, where excellent carbon dioxide gas corrosion resistance at high-temperature environments containing CO 2 and Cl - at high temperatures up to 200°C and excellent sulfide stress cracking resistance and excellent sulfide stress corrosion cracking resistance at corrosive environments further containing H 2 S are ensured in combination. In this regard, V, and/or Al, and/or at least one selected from the group consisting of Nb, Ti, Zr, and B, and/or at least one selected from the group consisting of REM, Ca, and Sn may be further contained.

公开(公告)号：EP3042968A4

公开(公告)日：2016-08-31

申请号：EP14842892

申请日：2014-08-04

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE ,  SUZUKI TAKESHI ,  SATO HIDEO ,  NAKAHASHI TETSU

IPC: 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 classification number: 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

Abstract: 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.

公开(公告)号：EP2865777A4

公开(公告)日：2015-11-11

申请号：EP13807143

申请日：2013-06-19

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE ,  MIYATA YUKIO ,  KIMURA MITSUO

IPC: C22C38/00 ,  C21D6/00 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C22C38/54 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/08 ,  C21D9/085 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: Chemical composition contains, by mass%, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15% or more and 1.0% or less, Cr: 13.5% or more and 15.4% or less, Ni: 3.5% or more and 6.0% or less, Mo: 1.5% or more and 5.0% or less, Cu: 3.5% or less, W: 2.5% or less, and N: 0.15% or less so that the relationship -5.9 x (7.82 + 27C - 0.91Si + 0.21Mn - 0.9Cr + Ni - 1.1Mo - 0.55W + 0.2Cu + 11N) ‰¥ 13.0 is satisfied. By this method, it is possible to manufacture a high strength stainless steel seamless pipe having excellent resistance to sulfide stress cracking equivalent to that of a steel having a chemical composition containing about 17% of Cr even with a chemical composition having comparatively low Cr content of about 15 mass%. In addition, V: 0.02% or more and 0.12% or less and/or Al: 0.10% or less and/or one or more selected from among Nb: 0.02% or more and 0.50% or less, Ti: 0.02% or more and 0.16% or less, Zr: 0.50% or less, and B: 0.0030% or less and/or one or more selected from among REM: 0.005% or less, Ca: 0.005% or less, and Sn: 0.20% or less may be further contained.

公开(公告)号：EP2322679A4

公开(公告)日：2016-11-30

申请号：EP08876878

申请日：2008-12-24

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  MIYATA YUKIO ,  KIMURA MITSUO

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/48 ,  C22C38/58

CPC classification number: C22C38/26 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48

Abstract: A seamless steel tube for OCTG which possesses both of high strength of yield strength YS of 95 ksi grade (665 to 758 MPa) and excellent low-temperature toughness, and a manufacturing method of the seamless steel tube are provided. To be more specific, to a stainless steel seamless tube having the composition which contains, by mass%, 0.020% or less C, 10 to 14% Cr, 3% or less Ni, 0.05% or less N, 0.03 to 0.2% Nb, and optionally further, 1.0% or less Si, 0.1 to 2.0% Mn, 0.020% or less P, 0.010% or less S, 0.10% or less Al, and Fe and unavoidable impurities as a balance, quenching in which the seamless tube is heated at a quenching temperature of A c3 transformation temperature or above and, thereafter, the seamless tube is cooled to a temperature range of 100°C or less at a cooling rate of air cooling or more, and tempering which follows the quenching and in which the seamless tube is heated at a tempering temperature of 550°C or above and is cooled are applied. Due to such treatment, a martensitic stainless steel seamless tube for country tubular goods which has the tempered martensitic structure where a precipitated Nb quantity is 0.020% or more, and possesses both of high strength at yield strength of 95 ksi grade and the excellent low-temperature toughness of fracture transition temperature vTrs of -40°C or below, and allows the hot straightening. In addition to the above-mentioned composition, the seamless steel tube may further contain one or two kinds of elements selected from Cu, Mo and/or one or two kinds selected from V, Ti, B in addition to the above-mentioned composition.

公开(公告)号：EP2933344A4

公开(公告)日：2015-12-30

申请号：EP13862381

申请日：2013-12-11

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE

IPC: C21D9/08 ,  C21D1/18 ,  C22C38/00 ,  C22C38/58

CPC classification number: C21D9/085 ,  C21D1/25 ,  C21D9/0062 ,  C21D9/08 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/24 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: Provided are a method for manufacturing a high strength stainless steel tube or pipe and a heat treatment equipment line for a high strength stainless steel tube or pipe in order to give stable product quality to a high Cr seamless steel tube or pipe which is subjected to a quenching and tempering treatment. Using an online heat treatment equipment for a seamless steel tube or pipe in which cooling facilities 4 which are capable of cooling a heat treated steel tube or pipe to a temperature of 20°C or lower are arranged on one of the ends or a portion of a heat treatment carrier line 3 which is arranged between the equipment for quenching 2 and the tempering furnace 5, by performing a heat treatment on a steel tube or pipe containing 14% or more of Cr in a manner such that a steel tube or pipe is cooled to a temperature of 20°C or lower after the steel tube or pipe has been cooled in a cooling process of a quenching treatment to a temperature of 50°C or lower and that the steel tube or pipe is thereafter subjected to a tempering treatment in order to manufacture a high strength stainless steel tube or pipe having stable quality.

公开(公告)号：EP2796587A4

公开(公告)日：2015-01-07

申请号：EP12859680

申请日：2012-12-18

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE ,  MIYATA YUKIO

IPC: C22C38/32 ,  C21D8/10 ,  C21D9/08 ,  C22C38/54

CPC classification number: C21D8/105 ,  C21D1/25 ,  C21D8/10 ,  C21D9/08 ,  C21D9/085 ,  C21D2211/008 ,  C21D2221/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  F16L9/02

Abstract: A seamless steel pipe has a composition containing, by mass%, C: 0.15 to 0.50%, Si: 0.1 to 1.0%, Mn: 0.3 to 1.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Cr: 0.1 to 1.7%, Mo: 0.40 to 1.1%, V: 0.01 to 0.12%, Nb: 0.01 to 0.08%, Ti: 0.03% or less, and B: 0.0005 to 0.003%, has a structure composed of a tempered martensite phase as a main phase with a prior austenite grain size number of 8.5 or more, and has a hardness distribution in which in four portions 90° apart from each other in the circumferential direction, hardness is 295 HV10 or less in any one of an inner surface-side region at 2.54 to 3.81 mm from the inner surface of the pipe, an outer surface side-region at the same distance from the outer surface of the pipe, and a center of the thickness. Therefore, the seamless steel pipe has high strength of 110 ksi grade (yield strength: 758 MPa or more) and excellent SSC-resistance. The composition may further contain Cu and/or W and/or Ni and/or Ca.

公开(公告)号：EP3321389A4

公开(公告)日：2018-05-16

申请号：EP16824022

申请日：2016-06-13

Applicant: JFE STEEL CORP

Inventor： EGUCHI KENICHIRO ,  ISHIGURO YASUHIDE ,  SUZUKI TAKESHI ,  FUJIMURA KAZUKI ,  OTA HIROKI

IPC: C22C38/00 ,  C21D1/18 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC classification number: C21D9/08 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/085 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: Provided is a high-strength seamless stainless steel pipe which can acquire high strength and high toughness together with excellent corrosion resistance while preventing frequent occurrence of rolling flaws. A steel pipe raw material having a composition comprising, by mass%, 0.05% or less C, 1.0% or less Si, 0.1 to 0.5% Mn, 0.05% or less P, 0.005% or less S, more than 16.0% to 18.0% or less Cr, more than 2.0% to 3.0% or less Mo, 0.5 to 3.5% Cu, 3.0% or more and less than 5.0% Ni, 0.01 to 3.0% W, 0.01 to 0.5% Nb, 0.001 to 0.3% Ti, 0.001 to 0.1% Al, less than 0.07% N, and 0.01% or less O is heated at a heating temperature which falls within a range of 1210 to 1350°C and at which an average grain size A (µm) of precipitates of Ti and Nb at the heating temperature and a sum of amounts B (mass%) of precipitated Ti and Nb satisfy A /B 2/3 ‰¤14.0. A seamless steel pipe is formed by applying hot pipe forming to the heated steel pipe raw material. The seamless steel pipe is cooled and, thereafter, quenching treatment is performed at a heating temperature of 850 to 1050°C. Then, tempering treatment is performed. Thus, it is possible to provide a high-strength seamless stainless steel pipe which has high strength having yield strength YS of 758MPa or more, high toughness having an absorbing energy value vE -10 of 40J or more, and excellent corrosion resistance.