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Patent Agency Ranking
1.发明授权公开(公告)号：US11193179B2
公开(公告)日：2021-12-07
申请号：US15543813
申请日：2015-12-03
Applicant: JFE STEEL CORPORATION
Inventor： Kazuki Fujimura , Yasuhide Ishiguro , Seigo Goto
IPC: C21D9/08 , C21D6/00 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/50 , C22C38/06 , C22C38/04 , C22C38/02 , C21D8/10 , C22C38/54 , C22C38/42 , C22C38/00 , C22C38/58 , C22C38/40 , C21D1/25
Abstract: A method of manufacturing a seamless stainless steel pipe for Oil Country Tubular Goods by heating a billet having a specified chemical composition including forming the billet into a seamless steel pipe by applying hot working to the billet, cooling the seamless steel pipe to a room temperature at a cooling rate of air cooling or more, thereafter, performing quenching by heating the seamless steel pipe to a temperature of 850° C. or above, subsequently, cooling the seamless steel pipe to a temperature of 100° C. or below at a cooling rate of air cooling or more, and subsequently, applying tempering to the seamless steel pipe at a temperature of 700° C. or below for a specific holding time.
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公开(公告)号：US11905765B2
公开(公告)日：2024-02-20
申请号：US17757722
申请日：2020-09-11
Applicant: JFE STEEL CORPORATION
Inventor： Jun Takano , Takamasa Kawai , Takuya Nagahama , Seigo Goto , Masaki Yoshikawa , Tsuyoshi Yoneyama
IPC: F16L15/06 , E21B17/042 , F16L15/00
CPC classification number: E21B17/042 , F16L15/001 , F16L15/06
Abstract: To prevent fracture of a box under a tensile load without increasing the outer diameter of the box. The presently disclosed threaded joint for pipes includes a pin provided with a male thread portion at one end of a first pipe, and a box provided with a female thread portion at one end of a second pipe, where each of a plurality of thread grooves of the female thread portion has a corner portion on a load flank side and a corner portion on a stabbing flank side on a thread bottom side, a corner portion on a load flank side of a first thread groove includes a first arc portion that has a first curvature radius, and a second arc portion that has a second curvature radius, and a ratio of the second curvature radius to the first curvature radius is 3 or more.
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公开(公告)号：US12110992B2
公开(公告)日：2024-10-08
申请号：US18044990
申请日：2020-09-30
Applicant: JFE STEEL CORPORATION
Inventor： Masaki Yoshikawa , Seigo Goto , Seiji Ozaki , Hideo Sato
Abstract: A threaded joint wherein a relationship between shoulder angle parameters and thread taper angle parameters for a coupling and a pair of pins inserted from both ends of the coupling is defined by the following expression (1), and a tightening torque with which the threaded joint is tightened is 60% or more and 85% or less of a yield torque determined by the following expression (2):
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1.5
°
≤
Δ
θ
-
Δ
ω
≤
2.
°
,
(
1
)
T
=
(
T
S
+
T
D
)
1
12
(
2
)
T
S
=
f
t
P
c
E
7
2
(
2
π
E
7
)
L
4
1
2
P
c
=
E
ρ
m
2
(
(
W
2
)
2
-
(
E
7
2
)
2
)
(
(
E
7
2
)
2
-
(
d
2
)
2
)
2
(
E
7
2
)
3
(
(
W
2
)
2
-
(
d
2
)
2
)
T
D
=
Y
m
A
S
(
P
2
π
+
R
t
f
s
cos
Θ
+
R
s
f
s
)
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公开(公告)号：US20240309480A1
公开(公告)日：2024-09-19
申请号：US18279945
申请日：2022-02-09
Applicant: JFE Steel Corporation
Inventor： Shunsuke Sasaki , Seigo Goto , Masao Yuga , Tatsuro Katsumura , Hideo Kijima
IPC: C21D9/14 , C21D6/00 , C21D8/10 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60
CPC classification number: C21D9/14 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/105 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60 , C21D2211/001 , C21D2211/005
Abstract: Provided herein is a duplex stainless steel pipe that is high in strength and has excellent abrasion resistance and indentation resistance on inner and outer surfaces of the steel pipe. A method for manufacturing such a stainless steel pipe is also provided. A duplex stainless steel pipe of the present invention has a composition that contains, in mass %, C: 0.005 to 0.150%, Si: 1.0% or less, Mn: 10.0% or less, Cr: 11.5 to 35.0%, Ni: 0.5 to 15.0%, Mo: 0.5 to 6.0%, N: less than 0.400%, and the balance being Fe and incidental impurities, and has a microstructure with a ferritic phase and an austenitic phase, the duplex stainless steel pipe having an axial tensile yield strength of 689 MPa or more, and having an outer surface and an inner surface each having an oxide layer having an average thickness of 1.0 μm or more.
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公开(公告)号：US11353144B2
公开(公告)日：2022-06-07
申请号：US17283018
申请日：2019-06-13
Applicant: JFE STEEL CORPORATION
Inventor： Takamasa Kawai , Taro Kanayama , Masaki Yoshikawa , Tsuyoshi Yoneyama , Seigo Goto
IPC: F16L15/00
Abstract: A threaded joint with excellent tensile strength, comprising: a pin having an externally threaded part comprising a first and second externally threaded sections across a step on an outer periphery on a distal-end side of a first steel pipe or tube; and a box having an internally threaded part comprising a first and second internally threaded sections across the step on an inner periphery on a distal-end side of a second steel pipe or tube, the externally threaded part being screwed to the internally threaded part to join the pin and the box. The threaded joint has a first and second thread sequence with lengths L1 and L2, respectively, and cross-sectional areas P1, P2, B1, and B2 at end positions 4, 5, 6, and 7, respectively, satisfying Formulas (1) and (2): (P2, B2)min≤P1/{L1/(L1+L2)}(1) and (P2, B2)min≤B1/{L2/(L1+L2)}(2), where (P2, B2)min represents P2 or B2, whichever is smaller.
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