公开(公告)号：US20170183752A1

公开(公告)日：2017-06-29

申请号：US15325145

申请日：2015-07-23

Applicant: JFE STEEL CORPORATION

Inventor： Kunio FUKUDA ,  Mitsuyuki FUJISAWA ,  Tomohiro ISHII ,  Shin ISHIKAWA ,  Chikara KAMI

IPC: C21D9/46 ,  C23C8/26 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C21D6/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/46

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0278 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C8/26

Abstract: Provided is a ferritic stainless steel that has excellent corrosion resistance and displays good brazing properties when brazing is carried out at high temperature using a Ni-containing brazing metal. These effects are obtained as a result of the steel having a chemical composition containing, in mass %: 0.003%-0.020% of C; 0.05%-1.00% of Si; 0.10%-0.50% of Mn, 0.04% or less of P; 0.01% or less of S; 16.0%-25.0% of Cr; 0.05%-0.60% of Ni; 0.25%-0.45% of Nb; 0.005%-0.15% of Al; 0.005%-0.030% of N; and at least one selected from 0.50%-2.50% of Mo and 0.05%-0.80% of Cu, the balance being Fe and incidental impurities, and as a result of a nitrogen-enriched layer being created that has a nitrogen concentration peak value of 0.03 to 0.30 mass % at a depth of within 0.05 μm of a surface of the steel.

公开(公告)号：US20170175237A1

公开(公告)日：2017-06-22

申请号：US15327537

申请日：2015-07-16

Applicant: Nippon Steel & Sumikin Stainless Steel Corporation

Inventor： Tooru MATSUHASHI ,  Yuuichi TAMURA

IPC: C22C38/60 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/32 ,  C22C38/00 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  F28F21/08 ,  C22C38/28

CPC classification number: C22C38/60 ,  B23K1/0012 ,  B23K1/008 ,  B23K1/19 ,  B23K2101/14 ,  B23K2103/04 ,  C21D1/773 ,  C21D6/002 ,  C21D9/46 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  F28F21/083

Abstract: A ferritic stainless steel, which has excellent heat exchange properties, corrosion resistance and brazing property of the heat exchanger component, and a heat exchanger using the ferritic stainless steel are provided. The ferritic stainless steel includes, in a mass %, C: 0.030% or less, N: 0.020% or less, Si: 0.5% or less, Mn: 1.0% or less, P:0.05% or less, 5: 0.01% or less, Cr: 16% to 25%, Nb: 0.05% to 1.0%, Al: 0.003% to 0.20%, and a balance composed of Fe and unavoidable impurities. The Al oxide is present on the surface of the material, the surface coverage ratio by the Al oxide is 5% to 70%, the surface roughness in Ra measured by red laser is 0.010 μm to 0.15 μm, and the thickness from the surface to the point, which includes the value of a half peak of the Al content on the surface, satisfies 300 nm or less, the value of a half peak of the Al content being obtained from an elemental profile expressed by a cation ratio.

公开(公告)号：US20170175236A1

公开(公告)日：2017-06-22

申请号：US15372800

申请日：2016-12-08

Applicant: POSCO

Inventor： Seong In JEONG ,  Sun Mi KIM ,  Man Jin HA

IPC: C22C38/42 ,  C22C38/02 ,  C22C38/00 ,  B21B1/22 ,  C21D8/02 ,  C21D8/00 ,  C21D6/00 ,  B21B3/00 ,  C22C38/04 ,  C21D9/46

CPC classification number: C22C38/42 ,  B21B1/22 ,  B21B3/00 ,  B21B2001/225 ,  C21D6/004 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04

Abstract: A stainless steel sheet for cookware and a method of manufacturing the same and, particularly, an induction heatable stainless steel sheet having excellent corrosion resistance and a method of manufacturing the same are provided. The induction heatable stainless steel sheet having excellent corrosion resistance includes, by wt %, C: 0.1% or less (excepting 0%), Si: 0.2% to 3.0%, Mn: 1.0% to 4.0%, Cr: 19.0% to 23.0%, Ni: 0.3% to 2.5%, N: 0.18% to 0.3%, Cu: 0.3% to 2.5%, iron (Fe) as a residual component thereof, and other unavoidable impurities, and has relative permeability of 20μr to 80μr. In addition, a microstructure includes, by volume %, ferrite: 30% to 70% and austenite as a remainder thereof.

公开(公告)号：US20170159719A1

公开(公告)日：2017-06-08

申请号：US15319613

申请日：2015-05-20

Applicant: NTN Corporation

Inventor： Daisuke KAGAWA ,  Tsuneaki HIRAOKA ,  Shintaro SUZUKI ,  Naoki NAKAGAWA ,  Tatsuro SUGIYAMA ,  Masazumi KOBAYASHI

IPC: F16D3/223 ,  F16D3/205 ,  F16D1/068 ,  B23K15/00

CPC classification number: F16D3/223 ,  B23K15/0006 ,  B23K15/002 ,  B23K15/0033 ,  B23K15/0053 ,  B23K15/04 ,  B23K15/06 ,  B23K26/0823 ,  B23K26/242 ,  B23K26/282 ,  B23K26/32 ,  B23K2101/04 ,  B23K2103/04 ,  B23K2103/18 ,  C21D9/50 ,  C21D2211/003 ,  C21D2211/005 ,  F16D1/027 ,  F16D1/068 ,  F16D3/205 ,  F16D3/2055 ,  F16D3/227 ,  F16D2003/22326 ,  F16D2250/0076 ,  Y10S464/906

Abstract: In an outer joint member of a constant velocity universal joint, a cup member and a shaft member are made of medium to high carbon steel and welded together. The cup member has a bottomed cylindrical shape that is opened at one end, and includes a cylindrical portion, a bottom portion, and a short shaft section of a solid shaft shape protruding from the bottom portion and having a joining end surface. The shaft member has a solid shaft shape and a joining end surface. The joining end surfaces of the cup and shaft members are brought into abutment against each other, and a high energy intensity beam is radiated from an outer side in a radial direction to form a welded portion. A structure of a molten metal at the welded portion is in a mixed phase of ferrite and granular cementite.

公开(公告)号：US09670560B2

公开(公告)日：2017-06-06

申请号：US14145034

申请日：2013-12-31

Applicant: Hyundai Motor Company

Inventor： Kyung-Bo Kim

IPC: C21D1/34 ,  C21D8/00 ,  B23K26/00 ,  B23K101/00 ,  B23K101/18 ,  B23K103/04 ,  B23K103/00

CPC classification number: C21D1/34 ,  B23K26/0006 ,  B23K26/0093 ,  B23K26/352 ,  B23K2101/006 ,  B23K2101/18 ,  B23K2103/04 ,  B23K2103/50 ,  C21D8/005 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2221/00

Abstract: A method for laser heat treatment of high tensile steel is provided to improve for improving formability. The method includes performing a heat treatment by irradiating a surface of a high tensile steel blank that includes a martensite structure and a ferrite structure with a laser to decrease a fraction of the martensite structure and increase a fraction of the ferrite structure. In addition, the method includes slowly cooling the blank to temper or anneal the heat-treated blank and subjecting the cooled blank to cold press forming.

公开(公告)号：US20170152580A1

公开(公告)日：2017-06-01

申请号：US15327489

申请日：2015-06-09

Applicant: JFE STEEL CORPORATION

Inventor： Hideyuki Kimura ,  Koichiro Fujita ,  Hiroshi Hasegawa ,  Mai Aoyama

IPC: C21D9/46 ,  B21B3/00 ,  C23C2/06 ,  C23C2/40 ,  C23G1/08 ,  C21D8/02 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B1/26

CPC classification number: C21D9/46 ,  B21B1/26 ,  B21B1/28 ,  B21B3/00 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23G1/081 ,  C23G1/085

Abstract: A method for manufacturing a high-strength galvanized steel sheet includes performing hot rolling, cold rolling, first annealing, pickling, and second annealing. The first annealing is performed to obtain a steel sheet having a steel microstructure including ferrite in an amount of 10% or more and 60% or less in terms of area ratio, and martensite, bainite, and retained austenite in a total amount of 40% or more and 90% or less in terms of area ratio. The second annealing includes heating to an annealing temperature of 750° C. or higher and 850° C. or lower, holding at the annealing temperature for 10 seconds or more and 500 seconds or less, cooling at an average cooling rate of 1° C./s or more and 15° C./s or less, performing a galvanizing treatment, and cooling to a temperature of 150° C. or lower at an average cooling rate of 5° C./s or more and 100° C./s or less.

公开(公告)号：US09657362B2

公开(公告)日：2017-05-23

申请号：US14555526

申请日：2014-11-26

Applicant: UD TRUCKS CORPORATION

Inventor： Yoshihiko Nozaki ,  Jouji Hagiwara ,  Kazuhiro Hirakawa ,  Norihiro Fujisawa

IPC: B21D31/06 ,  C21D7/06 ,  F01N3/20 ,  F01N13/16 ,  F01N13/18 ,  F01N3/02 ,  F01N13/00 ,  B24C1/10 ,  F01N3/28 ,  B24C3/32 ,  C21D9/50

CPC classification number: C21D7/06 ,  B21D31/06 ,  B24C1/10 ,  B24C3/325 ,  C21D9/50 ,  C21D2211/005 ,  F01N3/02 ,  F01N3/2066 ,  F01N3/208 ,  F01N3/2892 ,  F01N13/0097 ,  F01N13/16 ,  F01N13/18 ,  F01N2450/22 ,  F01N2530/04 ,  F01N2610/02 ,  Y02T10/24 ,  Y10T29/479

Abstract: In an exhaust gas purification apparatus or other apparatuses that are supplied with ammonia generated from a urea aqueous solution and causes selective reduction and purification of nitride oxides, a shot peening treatment is applied to a welded portion of its exhaust pipe which is made of a ferritic stainless steel plate and through which exhaust gas containing ammonia and hydrogen passes. By shot peening the welded portion of the exhaust pipe, a tensile residual stress in the welded portion of the exhaust pipe can be replaced with a compressive residual stress, and further the diameter of metal crystal grains in the welded portion can be reduced. In this way, the durability of the exhaust pipe can be improved.

公开(公告)号：US20170130294A1

公开(公告)日：2017-05-11

申请号：US15411372

申请日：2017-01-20

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuo YOKOI ,  Hiroshi SHUTO ,  Riki OKAMOTO ,  Nobuhiro FUJITA ,  Kazuaki NAKANO ,  Takeshi YAMAMOTO

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C21D6/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/28 ,  C22C38/08

CPC classification number: C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/28 ,  C22C38/38 ,  C22C38/58

Abstract: The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100} to {223} orientation group at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332} crystal orientation is 4.8 or less, an average crystal grain diameter is 10 μm or less and vTrs is −20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.

公开(公告)号：US20170121789A1

公开(公告)日：2017-05-04

申请号：US15409348

申请日：2017-01-18

Applicant: ArcelorMittal ,  Ugitech

Inventor： Jerome Peultier ,  Amelie Fanica ,  Nicolas Renaudot ,  Christophe Bourgin ,  Eric Chauveau ,  Marc Mantel

IPC: C21D9/52 ,  C21D1/613 ,  C21D1/60 ,  C21D9/46 ,  C21D8/02 ,  C21D8/06 ,  C22C38/60 ,  C22C38/58 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B3/02 ,  B21C1/00 ,  B21J1/02 ,  B22D11/00

CPC classification number: C21D9/525 ,  B21B1/00 ,  B21B3/02 ,  B21C1/003 ,  B21J1/02 ,  B22D11/002 ,  C21D1/60 ,  C21D1/613 ,  C21D6/004 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/065 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60

Abstract: A method for manufacturing a plate, a band, or a coil of hot-rolled steel is provided. The method includes providing an ingot or a slab of steel with a desired composition and a microstructure composed of austenite and 35 to 65% ferrite by volume and hot rolling the ingot or slab at a temperature between 1150 and 1280° C. to obtain a plate, a band or a coil. A method for manufacturing a hot-rolled bar or wire of steel, a steel profile and a forged steel piece are also provided.

公开(公告)号：US09631265B2

公开(公告)日：2017-04-25

申请号：US14119124

申请日：2012-05-24

Applicant: Kohichi Sano ,  Kunio Hayashi ,  Kazuaki Nakano ,  Riki Okamoto ,  Nobuhiro Fujita

Inventor： Kohichi Sano ,  Kunio Hayashi ,  Kazuaki Nakano ,  Riki Okamoto ,  Nobuhiro Fujita

IPC: C21D8/02 ,  C22C38/38 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32

CPC classification number: C22C38/38 ,  C21D8/005 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/105 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  Y10T428/12799

Abstract: A hot-rolled steel sheet satisfies that average pole density of orientation group of {100} to {223} is 1.0 to 5.0 and pole density of crystal orientation {332} is 1.0 to 4.0. Moreover, the hot-rolled steel sheet includes, as a metallographic structure, by area %, ferrite and bainite of 30% to 99% in total and martensite of 1% to 70%. Moreover, the hot-rolled steel sheet satisfies following Expressions 1 and 2 when area fraction of the martensite is defined as fM in unit of area %, average size of the martensite is defined as dia in unit of μm, average distance between the martensite is defined as dis in unit of μm, and tensile strength of the steel sheet is defined as TS in unit of MPa. dia≦13 μm  (Expression 1) TS/fM×dis/dia≧500  (Expression 2)