公开(公告)号：US20240318289A1

公开(公告)日：2024-09-26

申请号：US18579095

申请日：2021-07-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki HIRATA ,  Katsuki TANAKA ,  Masayuki TAKIGUCHI ,  Mitsuru YOSHIZAWA ,  Junichi HIGUCHI ,  Takahiro OSUKI

IPC: C22C38/54 ,  C21D1/18 ,  C21D1/28 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52

CPC classification number: C22C38/54 ,  C21D1/18 ,  C21D1/28 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C21D2211/005

Abstract: Provided is a heat-resistant ferritic steel having a chemical composition containing, by mass %, C: 0.07 to 0.14%, Si: 0.15 to 0.35%, Mn: 0.30 to 0.55%, P: 0.0250% or less, S: 0.0030% or less, Ni: 0.15 to 0.35%, Cr: 8.0 to 9.7%, Mo: 0.20 to 0.60%, W: 1.50 to 2.30%, V: 0.16 to 0.25%, Nb: 0.020 to 0.120%, B: 0.0010 to 0.0050%, N: 0.010 to 0.080%, Al: 0.020% or less, and O: 0.020% or less, with the balance Fe and impurities, wherein VER, i.e., the V content (mass %) in precipitates obtained by extracted residue analysis satisfies [−0.2×C+0.060≤VER≤−0.1×C+0.160].

公开(公告)号：US11767574B2

公开(公告)日：2023-09-26

申请号：US17865670

申请日：2022-07-15

Applicant: Harbin Engineering University

Inventor： Zhongwu Zhang ,  Junpeng Li

IPC: C21D9/46 ,  C21D8/02 ,  C21D1/28 ,  C21D1/18 ,  C21D6/00 ,  C22C38/52 ,  C22C38/50 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D1/28 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/50 ,  C22C38/52

Abstract: Disclosed is an ultrahigh-strength maraging stainless steel with multiphase strengthening and a preparation method thereof. The stainless steel has a composition in mass percentage as follows: 1.0-5.0% of Co, 6.0-10.0% of Ni, 11.0-17.0% of Cr, 0.3-2.0% of Ti, 3.0-7.0% of Mo, 0.08-1.0% of Mn, 0.08-0.5% of Si, 0.02% or less of C, 0.003% or less of P, 0.003% or less of S, and Fe as a balance.

公开(公告)号：US20230079323A1

公开(公告)日：2023-03-16

申请号：US18047331

申请日：2022-10-18

Applicant: JFE STEEL CORPORATION ,  JFE Welded Pipe Manufacturing Co.,Ltd.

Inventor： Yoshikazu KAWABATA ,  Makio GUNJI

IPC: C21D9/08 ,  B23K11/087 ,  B23K31/12 ,  C21D1/28 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/20 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

Abstract: An electric resistance welded steel pipe or tube comprises: a base metal being a steel sheet having a specific chemical composition and an electric resistance weld portion having a bond width of 40×10−6 m or more and 120×10−6 m or less, wherein C0-C1 is 0.05 mass % or less, where C0-C1 is a difference between C1 in mass % which is a minimum C content of the electric resistance weld portion and Co in mass % which is a C content of the steel sheet, and a depth of a total decarburized layer in each of an inner surface layer and an outer surface layer of the electric resistance welded steel pipe or tube is 50×10−6 m or less.

公开(公告)号：US20230072654A1

公开(公告)日：2023-03-09

申请号：US17865670

申请日：2022-07-15

Applicant: Harbin Engineering University

Inventor： Zhongwu ZHANG ,  Junpeng LI

IPC: C21D9/46 ,  C21D8/02 ,  C21D1/28 ,  C21D1/18 ,  C21D6/00 ,  C22C38/52 ,  C22C38/50 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: Disclosed is an ultrahigh-strength maraging stainless steel with multiphase strengthening and a preparation method thereof. The stainless steel has a composition in mass percentage as follows: 1.0-5.0% of Co, 6.0-10.0% of Ni, 11.0-17.0% of Cr, 0.3-2.0% of Ti, 3.0-7.0% of Mo, 0.08-1.0% of Mn, 0.08-0.5% of Si, 0.02% or less of C, 0.003% or less of P, 0.003% or less of S, and Fe as a balance.

公开(公告)号：US11434553B2

公开(公告)日：2022-09-06

申请号：US16314394

申请日：2017-07-06

Applicant: MAGANG (GROUP) HOLDING CO.,LTD. ,  MAANSHAN IRON & STEEL CO.,LTD.

Inventor： Mingru Zhang ,  Hai Zhao ,  Zheng Fang ,  Feng Zhang ,  Rongjie Deng ,  Manli Sun

IPC: C22C38/04 ,  C22C38/02 ,  C21D1/28 ,  C21D1/18 ,  C22C38/00 ,  C21D6/00 ,  C21D9/34

Abstract: The present invention discloses a low cost lean production bainitic steel wheel for rail transit and a manufacturing method therefor. The steel wheel contains elements with the following weight percentages: carbon C: 0.15-0.45%, silicon Si: 1.00-2.50%, manganese Mn: 1.20-3.00%, rare earth RE: 0.001-0.040%, phosphorus P≤0.020%, and sulphur S≤0.020%, where the remaining is iron and unavoidable residual elements, and 3.00%≤Si+Mn≤5.00%. Compared with the prior art, through alloying design and a preparation process, especially a heat treatment process and technology, a rim of the wheel obtains a carbide-free bainite structure, and a web and a wheel hub obtain granular bainite, a supersaturated ferritic structure, and a small amount of pearlite. The wheel has high comprehensive mechanical properties and service performance. In addition, the heat treatment process and technology are fully used without particularly adding alloying elements such as Mo, Ni, V, Cr, and B, to greatly reduce costs of steel and realize lean production.

公开(公告)号：US20220010403A1

公开(公告)日：2022-01-13

申请号：US17297834

申请日：2019-11-19

Applicant: POSCO

Inventor： Dae-Woo Kim

IPC: C21D9/46 ,  C21D8/02 ,  C21D1/28 ,  C21D6/00 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: The present invention relates to a steel material for a pressure vessel, which is used in a hydrogen sulfide atmosphere, and, more specifically, to a steel material having excellent hydrogen induced cracking (HIC) resistance, and a manufacturing method therefor.

公开(公告)号：US20210285078A1

公开(公告)日：2021-09-16

申请号：US16330655

申请日：2017-09-20

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuya IWASAKI ,  Koji WATARI ,  Hidekazu SUENO

IPC: C22C38/06 ,  C22C38/54 ,  C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  B32B15/08 ,  C21D9/28 ,  C21D1/10 ,  C21D1/28 ,  F16C3/02

Abstract: A shaft part excellent in static torsional strength and torsional fatigue strength containing, by mass %, essential elements of C: 0.35 to 0.70%, Si: 0.01 to 0.40%, Mn: 0.5 to 2.6%, P: 0.050% or less, S: 0.005 to 0.020%, Al: 0.010 to 0.050%, N: 0.005 to 0.025%, and O: 0.003% or less, further containing optional elements, having a balance of Fe and impurities, having a chemical composition satisfying formula (1), having at least one hole at an outer circumferential surface, having a volume ratio (R1) of 4 to 20% of retained austenite at a position of a 2 mm depth from the outer circumferential surface, having a volume ratio of retained austenite at a position of a 2 mm depth from the outer circumferential surface in an axial direction of the hole and at a position of a 20 μm depth from the surface of the hole as R2, and having a reduction rate Δγ of 40% or more of retained austenite found by the formula (A): Δγ=[(R1−R2)/R1]×100: Formula (1): 15.0≤25.9C+6.35Mn+2.88Cr+3.09Mo+2.73Ni≤27.2 (Notations of elements in formula are contents of the elements)

公开(公告)号：US10991954B2

公开(公告)日：2021-04-27

申请号：US16064891

申请日：2016-12-21

Applicant: POSCO

Inventor： Jong Hee Kim ,  Kwang Min Kim ,  Jae Hwa Lee ,  Yang Jin Chung ,  Ki Hoon Jo ,  Bo Sung Seo

IPC: H01M8/021 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C25F1/06 ,  H01M8/1018 ,  C23C22/50 ,  C23G1/08 ,  C21D7/02 ,  C21D1/28 ,  C21D7/04 ,  C22C38/22

Abstract: Stainless steel with improved hydrophilicity and contact resistance for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator, and a method of manufacturing the stainless steel Stainless steel are disclosed. Stainless steel for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator according to an embodiment of the present disclosure may include: by weight percent, 0 to 0.02% of C (excluding 0), 0 to 0.02% of N (excluding 0), 0 to 0.25% of Si (excluding 0), 0 to 0.2% of Mn (excluding 0), 0 to 0.04% of P (excluding 0), 0 to 0.02% of S (excluding 0), 20 to 34% of Cr, 0 to 0.6% of V (excluding 0), 0 to 0.5% of Ti (excluding 0), 0 to 0.5% of Nb (excluding 0), and the remainder comprising iron (Fe) and other unavoidable impurities, wherein a plurality of patterns may be formed on a surface of the stainless steel in a direction that is inclined with respect to a rolling direction, and the plurality of patterns are arranged repeatedly in the rolling direction.

公开(公告)号：US10718377B2

公开(公告)日：2020-07-21

申请号：US15771763

申请日：2016-10-12

Applicant: NTN CORPORATION

Inventor： Michio Hori ,  Hideto Torisawa ,  Hiroshi Yuki ,  Chikara Ohki ,  Kazuhiro Yagita

IPC: F16C19/38 ,  C21D9/40 ,  C21D1/42 ,  C22C38/22 ,  C21D6/00 ,  C22C38/04 ,  C21D1/10 ,  C22C38/02 ,  C21D1/28 ,  F16C33/62 ,  F16C33/64 ,  C22C38/44 ,  C22C38/00 ,  C21D1/18 ,  F16C37/00 ,  F16C33/58 ,  C22C38/12 ,  C22C38/08

Abstract: There is prepared a formed body constituted of steel and having an outer circumferential surface having an annular groove having a bottom surface to serve as a raceway surface of the bearing ring. In the step of forming a heated region, the formed body is induction heated to form a heated region including the bottom surface of the groove and heated to a temperature of at least an A1 point. In the cooling step, the whole of the heated region is simultaneously cooled to a temperature of not more than an Ms point. The step of retaining the formed body in a state in which heating is stopped is performed after the step of forming a heated region before the step of cooling. In the step of retaining, dispersion in temperature in the heated region in the circumferential direction is suppressed to not more than 20° C.

公开(公告)号：US10392683B2

公开(公告)日：2019-08-27

申请号：US15117458

申请日：2015-02-25

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Taizo Makino ,  Yukiteru Takeshita ,  Naomitsu Mizui ,  Yutaka Wakasu

IPC: C21D1/28 ,  C21D8/00 ,  C21D9/28 ,  B60B35/00 ,  B60B35/02 ,  B60B35/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50

Abstract: Provided is a rail vehicle axle having an excellent fatigue limit and notch factor. A rail vehicle axle according to the present embodiment has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.20 to 0.65%, Mn: 0.40 to 1.20%, P: 0.020% or less, S: 0.020% or less, Cu: 0 to 0.30%, Ni: 0 to 0.30%, Cr: 0 to 0.30%, Mo: 0 to 0.08%, Al: 0 to 0.100%, N: 0.0200% or less, V: 0 to 0.060%, and Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2): 0.58≤C+Si/8+Mn/5+Cu/10+Cr/4+V≤0.67  (1) Si+0.9Cr≥0.50  (2) where, each element symbol in Formulae (1) and (2) is substituted by the content (mass %) of a corresponding element.