公开(公告)号：US20180044750A1

公开(公告)日：2018-02-15

申请号：US15552485

申请日：2016-02-24

Applicant: Hyun Jo Jun ,  ArcelorMittal

Inventor： Hyun Jo JUN

IPC: C21D9/46 ,  C22C38/26 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C21D1/20 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/38 ,  C22C38/00

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/20 ,  C21D1/25 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/26 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A cold rolled, coated and post annealed steel sheet. The cold rolled steel sheet may comprise (in wt. %): C—0.1-0.3 %; Mn—1-3%; Si—0.5-3.5%; Al—0.05-1.5%; Mo+Cr is between 0-1.0%; and Mo+Cr is between 0.2-0.5%. The steel sheet may be coated with a zinc or zinc alloy coating. The coated steel sheet may be formed by cold rolling, zinc coating the cold rolled sheet and annealing said steel sheet after application of said zinc coating. The annealing is performed at a temperature and for a time sufficient to significantly increase the yield strength and hole expansion of the annealed coated cold rolled steel sheet as compared with the as coated sheet.

公开(公告)号：US20180044749A1

公开(公告)日：2018-02-15

申请号：US15551171

申请日：2016-02-22

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hiroshi SHUTO ,  Natsuko SUGIURA ,  Mitsuru YOSHIDA ,  Tatsuo YOKOI ,  Masayuki WAKITA

IPC: C21D9/46 ,  C22C38/48 ,  C22C38/32 ,  C22C38/24 ,  C22C38/22 ,  C21D6/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/50 ,  C22C38/20

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/48 ,  C22C38/50

Abstract: A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which include, by area ratio, ferrite and bainite in a range of 80% to 98% in total, and martensite in a range of 2% to 10%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.

公开(公告)号：US09890437B2

公开(公告)日：2018-02-13

申请号：US14377354

申请日：2013-02-06

Applicant: Kobe Steel, Ltd.

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta ,  Hideo Hata

IPC: C22C38/06 ,  C21D8/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/58 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18

CPC classification number: C21D8/005 ,  C21D8/02 ,  C21D8/0236 ,  C21D8/0247 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58

Abstract: This high-strength steel sheet contains, in mass %, 0.05 to 0.3% of C, 1 to 3% of Si, 0.5 to 3% of Mn, up to 0.1% (inclusive of 0%) of P, up to 0.01% (inclusive of 0%) of S, 0.001 to 0.1% of Al and 0.002 to 0.03% of N with the balance consisting of iron and unavoidable impurities, and has a microstructure which comprises, in area fraction relative to the microstructure, 40 to 85% of bainitic ferrite, 5 to 20% of retained austenite (γR), 10 to 50% (in total) of martensite and γR, and 5 to 40% of ferrite. The retained austenite (γR) has a C concentration of 0.5 to 1.0 mass %, while the quantity of γR present in the ferrite grains is 1% or more (in area fraction) relative to the microstructure.

公开(公告)号：US20180030557A1

公开(公告)日：2018-02-01

申请号：US15554937

申请日：2016-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Sota Goto ,  Shunsuke Toyoda ,  Takatoshi Okabe

IPC: C21D8/02

CPC classification number: C21D8/02 ,  B21C37/08 ,  B23K11/002 ,  B23K11/02 ,  B23K11/0873 ,  B23K11/16 ,  B23K13/025 ,  B23K31/027 ,  B23K2101/06 ,  B23K2101/18 ,  B23K2103/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/58 ,  F16L9/17 ,  Y02P10/212

Abstract: Provided is a high-strength electric resistance welded steel pipe having excellent bendability and which includes a composition containing, on a mass % basis, C: 0.04% to 0.15%, Si: 0.10% to 0.50%, Mn: 1.0% to 2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2% to 1.0%, Ti: 0.005% to 0.030%, and Al: 0.010% to 0.050%, the balance being Fe and unavoidable impurities, and a microstructure including polygonal ferrite with a volume fraction of 70% or more and retained austenite with a volume fraction of 3% to 20%, the balance being at least one selected from martensite, bainite, and pearlite, wherein the polygonal ferrite has an average grain size of 5 μm or more and an aspect ratio of 1.40 or less.

公开(公告)号：US09879332B2

公开(公告)日：2018-01-30

申请号：US14487140

申请日：2014-09-16

Applicant: JFE Steel Corporation

Inventor： Takumi Tanaka ,  Katsumi Kojima ,  Makoto Aratani ,  Hiroki Iwasa

IPC: C21D8/02 ,  C21D8/00 ,  B22D11/00 ,  B22D11/124 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C21D9/48

CPC classification number: C21D8/005 ,  B22D11/001 ,  B22D11/124 ,  C21D8/0436 ,  C21D8/0442 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A method of manufacturing a high-strength steel sheet includes, on a mass percent basis, 0.03%-0.10% C, 0.01%-0.5% Si, 0.001%-0.100% P, 0.001%-0.020% S, 0.01%-0.10% Al, 0.005%-0.012% N, the balance being Fe and incidental impurities, and microstructures that do not contain a pearlite microstructure, wherein, when Mnf=Mn [% by mass]−1.71×S [% by mass], Mnf is 0.3 to 0.6, including: forming a slab by vertical-bending type continuous casting or bow type continuous casting, wherein surface temperature of a slab corner in a region where the slab undergoes bending deformation or unbending deformation is 800° C. or lower, or 900° C. or higher; forming a steel sheet by hot-rolling the slab followed by cold rolling; annealing the steel sheet after the cold rolling; and skinpass rolling at a draft of 3% or less after the annealing.

公开(公告)号：US09873924B2

公开(公告)日：2018-01-23

申请号：US14425313

申请日：2012-09-03

Applicant: Pierre-Olivier Santacreu ,  Claudine Miraval ,  Saghi Saedlou

Inventor： Pierre-Olivier Santacreu ,  Claudine Miraval ,  Saghi Saedlou

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B22D7/00 ,  F01N3/20

CPC classification number: C21D8/0205 ,  B22D7/00 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  F01N3/2066 ,  F01N2610/02

Abstract: A ferritic stainless steel sheet of a composition, expressed in weight percentages: trace amounts≦C≦0.03%; 0.2%≦Mn≦1%; 0.2%≦Si≦1%; trace amounts≦S≦0.01%; trace amounts≦P≦0.04%; 15%≦Cr≦22%; trace amounts≦Ni≦0.5%; trace amounts≦Mo≦2%; trace amounts≦Cu≦0.5%; 0.160%≦Ti≦1%; 0.02%≦Al≦1%; 0.2%≦Nb≦1%; trace amounts≦V≦0.2%; 0.009%≦N≦0.03%; trace amounts≦Co≦0.2%; trace amounts≦Sn≦0.05%; rare earths (REE)≦0.1%; trace amounts≦Zr≦0.01%; the remainder of the composition consisting of iron and of inevitable impurities resulting from the elaboration; the Al and rare earth (REE) contents satisfying the relationship: Al+30×REE≧0.15%; the Nb, C, N and Ti contents in % satisfy the relationship: 1/[Nb+(7/4)×Ti−7×(C+N)]≦3; said metal sheet having an entirely recrystallized structure and an average ferritic grain size comprised between 25 and 65 μm.A method for manufacturing such a ferritic stainless steel sheet, and its use for manufacturing parts involving shaping and welding and intended to be subject to a periodic temperature of use comprised between 150° C. and 700° C. and to a projection of a mixture of water, urea and ammonia.

公开(公告)号：US20180016658A1

公开(公告)日：2018-01-18

申请号：US15546063

申请日：2016-01-27

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Makoto OKONOGI ,  Daisuke HIRAKAMI ,  Tatsusei TADA

IPC: C21D9/52 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/06 ,  C22C38/22 ,  C21D6/00 ,  C22C38/02 ,  C22C38/00 ,  C21D8/06 ,  C22C38/38 ,  C22C38/24

CPC classification number: C21D9/525 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/06 ,  C21D8/065 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

Abstract: A steel wire for a non heat-treated mechanical part includes, as a chemical composition, by mass %, a predetermined amount of C, Si, Mn, Cr, Mo, Ti, Al, B, Nb, and V, and limited P, S, N, and O and a remainder of Fe and impurities; in which a structure includes, by volume %, a bainite of greater than or equal to 75×[C %]+25, and a remainder of one or more of a ferrite and a pearlite when an amount of C is set to [C %] by mass %; when an average aspect ratio of a bainite block in a second surface layer area of the steel wire is set as R1, the R1 is greater than or equal to 1.2; when an average grain size of a bainite block in a third surface layer area of the steel wire is set to PS3 μm, and an average grain size of a bainite block in a third center portion of the steel wire is set to PC3 μm, the PS3 satisfies Expression (c), and the PS3 and the PC3 satisfy Expression (d), a standard deviation of a grain size of the bainite block in the structure is less than or equal to 8.0 μm; and a tensile strength is in a range of 800 MPa to 1600 MPa, PS3≦20/R1   (c), PS3/PC3≦0.95   (d).

公开(公告)号：US09863028B2

公开(公告)日：2018-01-09

申请号：US14413471

申请日：2013-06-26

Applicant: Kobe Steel, Ltd.

Inventor： Elijah Kakiuchi ,  Toshio Murakami ,  Katsura Kajihara ,  Tatsuya Asai ,  Naoki Mizuta

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  B32B15/01 ,  B32B15/18 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C22C38/00 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C21D8/02 ,  C23C2/02

CPC classification number: C23C2/06 ,  B32B15/013 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/12799

Abstract: A hot-dip galvanized steel sheet contains specific amounts of C, Si, Mn, P, S, Ti, Al, and N with the remainder being iron and unavoidable impurities. Bainitic ferrite, martensite, retained γ, and ferrite (α) are present each in a specific area ratio. The remainder γ has a specific C concentration. Sub-grains in the recrystallized α and un-recrystallized α have a specific grain diameter. The surface area ratio of α and worked α having a grain diameter of 5 μm or more is 5% or less. The average particle diameter of TiC particles inside α grains is 10 nm or less.

公开(公告)号：US09856551B2

公开(公告)日：2018-01-02

申请号：US14725713

申请日：2015-05-29

Applicant: OUTOKUMPU STAINLESS AKTIEBOLAG ,  Siv Liljas

Inventor： Elisabeth Alfonsson ,  Jun Wang ,  Mats Liljas ,  Per Johansson

IPC: C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/58 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/00 ,  C22C38/54

CPC classification number: C22C38/58 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A ferritic-austenitic stainless steel having a microstructure containing 35-65 vol-% ferrite and 35-65 vol-% austenite has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions apply for the chromium and nickel equivalents: 20

公开(公告)号：US20170349967A1

公开(公告)日：2017-12-07

申请号：US15538404

申请日：2015-02-20

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuo YOKOI ,  Mitsuru YOSHIDA ,  Natsuko SUGIURA ,  Hiroshi SHUTO ,  Masayuki WAKITA

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C21D8/02 ,  C22C38/00 ,  B21B3/02 ,  C22C38/18 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/02

CPC classification number: C21D9/46 ,  B21B3/02 ,  B21B2261/20 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58

Abstract: A hot-rolled steel sheet includes a specific chemical composition, and includes a microstructure represented by, in vol %: retained austenite: 2% to 30%; ferrite: 20% to 85%; bainite: 10% to 60%; pearlite: 5% or less; and martensite: 10% or less. A proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 5% to 50% by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more.