公开(公告)号：US12006561B2

公开(公告)日：2024-06-11

申请号：US16315157

申请日：2017-07-05

Applicant: Proterial, Ltd.

Inventor： Toshihiro Uehara ,  Akihiro Toji

IPC: C22C38/54 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  F02M61/16

CPC classification number: C22C38/54 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  F02M61/166 ,  F02M2200/05 ,  F02M2200/9053

Abstract: A martensitic stainless steel for a fuel injection member contains, in mass %, at least 0.35% and less than 0.50% of C, more than 0.20% and at most 0.40% of Si, 0.2-0.4% of Mn, 0.25% or less of Ni, 15.0-17.0% of Cr, more than 2.0% and at most 3.0% of Mo, 0.1-0.3% of W, 0.001-0.003% of B, and at least 0.15% and less than 0.20% of N, with the remainder comprising Fe and inevitable impurities, which include 0-0.025% of P, 0-0.005% of S, 0-0.2% of Cu, 0-0.05% of Al, 0-0.02% of Ti, 0-0.02% of Nb, 0-0.15% of V, 0-0.003% of O, and 0-0.001% of H.

公开(公告)号：US20240186042A1

公开(公告)日：2024-06-06

申请号：US18285440

申请日：2022-05-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Kazutoshi TAKEDA ,  Masaru TAKAHASHI ,  Yoshiyuki USHIGAMI

IPC: H01F1/18 ,  C21D1/74 ,  C21D6/00 ,  C21D8/02 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  C23C22/82 ,  C23C28/04

CPC classification number: H01F1/18 ,  C21D1/74 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0284 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  C23C22/82 ,  C23C28/04

Abstract: Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 μm. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-Kα excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2θ=24.8°; a half value width FWHM0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=0.5° and a half value width FWHM1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=1.0° satisfy 0.20°≤FWHM0.5≤2.00°, 0.20°≤FWHM1.0≤2.00°, and 0°≤|F.WHM0.5−FWHM1.0|≤1.00°.

公开(公告)号：US12000364B2

公开(公告)日：2024-06-04

申请号：US15121058

申请日：2015-02-23

Applicant: USUI KOKUSAI SANGYO KAISHA, LTD. ,  NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuya Masuda ,  Tsugumi Yamazaki ,  Taizo Makino ,  Katsunori Nagao ,  Tsutomu Okuyama

IPC: C22C38/02 ,  C21D8/10 ,  C21D9/08 ,  C21D9/14 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  F02M55/02 ,  C21D7/10

CPC classification number: F02M55/02 ,  C21D8/10 ,  C21D8/105 ,  C21D9/14 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D7/10 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/008 ,  F02M2200/9061

Abstract: A steel pipe has a composition consisting, by mass percent, of, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, Mn: 0.3 to 2.0%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.015%, Nb: 0.015 to 0.045%, Cr 0 to 1.0%, Mo: 0 to 1.0%, Cu: 0 to 0.5%, Ni: 0 to 0.5%, V: 0 to 0.15%, and B: 0 to 0.005%, the balance being Fe and impurities. As impurities, contents are Ca: 0.001% or less, P: 0.02% or less, S: 0.01% or less, and O: 0.0040% or less. The micro-structure is tempered martensitic or tempered martensite and tempered bainite, in which a prior-austenite grain size number is 10.0 or more. Tensile strength is TS 800 MPa or higher. Critical internal pressure is [0.3′TS′a] or more, a=[(D/d)2−1]/[0.776′(D/d)2], D: pipe outer diameter (mm), d: pipe inner diameter (mm).

公开(公告)号：US20240175103A1

公开(公告)日：2024-05-30

申请号：US18566072

申请日：2022-10-27

Applicant: POSCO CO., LTD

Inventor： Dong-Wan KIM ,  Min-Seo KOO

IPC: C21D9/46 ,  C21D1/18 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: Provided is an ultrahigh-strength steel sheet with excellent bendability and stretch flangeability, and a manufacturing method therefor and, more specifically, to: a steel sheet having excellent bendability and stretch flangeability by using rapid low-temperature tempering, and having a high yield ratio and ultrahigh strength; and a manufacturing method therefor.

公开(公告)号：US11993835B2

公开(公告)日：2024-05-28

申请号：US17421769

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi Takeda ,  Ichiro Tanaka ,  Takashi Kataoka ,  Tomoya Suenaga ,  Yuki Kunita

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C22C38/06 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0284 ,  C21D8/0289 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04

Abstract: A grain-oriented electrical steel sheet is a grain-oriented electrical steel sheet which does not have an inorganic coating containing forsterite as a main component and which includes: a base steel sheet containing a prescribed chemical component; a silicon-containing oxide layer provided on the base steel sheet; an iron-based oxide layer provided on the silicon-containing oxide layer; and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components. When the tension-insulation coating undergoes elemental analysis using a glow discharge optical emission spectrometry in a sheet thickness direction from a surface of the tension-insulation coating, a peak Si emission intensity satisfies a prescribed requirement.

公开(公告)号：US20240167129A1

公开(公告)日：2024-05-23

申请号：US18283052

申请日：2022-03-23

Applicant: JFE Steel Corporation

Inventor： Hiroshi Hasegawa ,  Hideyuki Kimura ,  Takanori Umino ,  Noriaki Moriyasu

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06

CPC classification number: C22C38/04 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C21D2211/002 ,  C21D2211/008

Abstract: A high-strength hot-rolled steel sheet has a chemical composition containing, by mass %, C: 0.02% to 0.23%, Si: 0.10% to 3.00%, Mn: 0.5% to 3.5%, P: 0.100% or less, S: 0.02% or less, and Al: 1.5% or less, the balance being Fe and incidental impurities, in which the total area fraction of martensite and bainite is 80% to 100%, the maximum orientation density of grains is less than 2.5 in a region extending from a position of 5 μm to a position of 10 μm from a surface in the thickness direction, and the maximum orientation density of grains is 2.5 or more in a region extending from a position of 50 μm to a position of 100 μm from the surface in the thickness direction.

公开(公告)号：US20240167128A1

公开(公告)日：2024-05-23

申请号：US18274778

申请日：2021-11-12

Applicant: JFE Steel Corporation

Inventor： Kazuki Endoh ,  Yoshiyasu Kawasaki ,  Yuki Toji

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28

CPC classification number: C22C38/04 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/02 ,  C22C38/06 ,  C23C2/06 ,  C23C2/28 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A high-strength steel sheet is disclosed having a specified chemical composition and a steel microstructure composed of, on an area fraction basis, ferrite: 1% to 40%, fresh martensite: less than 1.0%, bainite and tempered martensite in total: 40% to 90%, and retained austenite: 6% or more, wherein a value obtained by dividing an average Mn content (% by mass) of the retained austenite by an average Mn content (% by mass) of the ferrite is 1.1 or more, and a value obtained by dividing an average C content (% by mass) of retained austenite with an aspect ratio of 2.0 or more by an average C content (% by mass) of the ferrite is 3.0 or more, and a diffusible hydrogen content of steel is 0.3 ppm by mass or less.

公开(公告)号：US20240153683A1

公开(公告)日：2024-05-09

申请号：US18281193

申请日：2022-03-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu MURAKAWA

IPC: H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60

CPC classification number: H01F1/14791 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1233 ,  C21D8/1266 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  C22C2202/02

Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {411} orientated grains is indicated by S411, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {411} orientated grains is indicated by K411, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20≤Styl/Stot≤0.85, 0.05≤S411/Stot≤0.80, S411/Stra≥0.50, and K411/Ktyl≤0.990 are satisfied.

公开(公告)号：US20240141463A1

公开(公告)日：2024-05-02

申请号：US18279342

申请日：2022-03-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu MURAKAWA ,  Minako FUKUCHI

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/32

CPC classification number: C22C38/02 ,  C22C38/002 ,  C22C38/004 ,  C22C38/06 ,  C22C38/32

Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, one or more particles that are a precipitate of a sulfide or an oxysulfide of one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd or both the sulfide and the oxysulfide and have a diameter of more than 0.5 μm are present in a visual field of 10000 μm2, and, when EBSD observation is performed on a surface parallel to a steel sheet surface, in a case where a total area is indicated by Stot, an area of {100} orientated grains is indicated by S100, an area of orientated grains in which a Taylor factor M becomes more than 2.8 is indicated by Styl, a total area of orientated grains in which the Taylor factor M becomes 2.8 or less is indicated by Stra, an average KAM value of the {100} orientated grains is indicated by K100, and an average KAM value of the orientated grains in which the Taylor factor M becomes more than 2.8 is indicated by Ktyl, 0.20≤Styl/Stot≤0.85, 0.05≤S100/Stot≤0.80, S100/Stra≥0.50, and K100/Ktyl≤0.990 are satisfied.

公开(公告)号：US20240141454A1

公开(公告)日：2024-05-02

申请号：US18570064

申请日：2022-06-17

Applicant: POSCO CO., LTD

Inventor： Sang-Hyun KIM ,  Min-Seo KOO ,  Eun-Young KIM

IPC: C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C21D2211/008

Abstract: Provided is an ultra high strength steel sheet having a high yield ratio, and a method for manufacturing same and, more specifically, to a steel sheet having ultra high strength, a high yield ratio and excellent bendability, and a method for manufacturing same.