公开(公告)号：US20170253943A1

公开(公告)日：2017-09-07

申请号：US15509353

申请日：2015-08-20

Applicant: JFE STEEL CORPORATION

Inventor： Yoichi MAKIMIZU ,  Yoshitsugu SUZUKI ,  Hideyuki TAKAHASHI ,  Gentaro TAKEDA ,  Koichiro FUJITA

IPC: C21D9/46 ,  C23C2/06 ,  C23C2/02 ,  C23C2/40 ,  C23F17/00 ,  C22C38/32 ,  C22C38/18 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0278 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/32 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23F17/00

Abstract: A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, C: 0.05 to 0.30%, Si: 0.1 to 2.0% and Mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature TC, and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % Al.

公开(公告)号：US20170037488A1

公开(公告)日：2017-02-09

申请号：US15106606

申请日：2014-12-01

Applicant: JFE STEEL CORPORATION

Inventor： Hiroshi HASEGAWA ,  Shinjiro KANEKO ,  Yoichi MAKIMIZU ,  Yoshitsugu SUZUKI

IPC: C21D9/46 ,  C21D6/00 ,  C21D1/22 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/06 ,  C23C2/02 ,  C23C2/28 ,  C21D8/02

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/22 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

Abstract: A high-strength hot-dip galvanized steel sheet having a surface coated with a hot-dip galvanized coating, the steel sheet having a chemical composition comprising C: more than 0.10% and less than 0.18%, Si: 0.01 to 1.00%, Mn: 1.5 to 4.0%, P: 0.100% or less, S: 0.020% or less, Al: 0.010 to 0.500%, Cr: 0.010 to 2.000%, Nb: 0.005 to 0.100%, Ti: 0.005 to 0.100%, B: more than 0.0005% and 0.0030% or less, and Fe and incidental impurities, and a method for producing the same. The steel sheet has a microstructure including ferrite having an area fraction in the range of 0 to 10%, martensite having an area fraction in the range of 15 to 60%, tempered martensite having an area fraction in the range of 20 to 50%, and bainitic ferrite having an area fraction in the range of 20 to 50%.

Abstract translation: 一种具有涂覆有热镀锌涂层的表面的高强度热浸镀锌钢板，该钢板具有C：大于0.10％且小于0.18％的化学组成，Si：0.01〜1.00％，Mn ：1.5〜4.0％，P：0.100％以下，S：0.020％以下，Al：0.010〜0.500％，Cr：0.010〜2.000％，Nb：0.005〜0.100％，Ti：0.005〜0.100％ 大于0.0005％和0.0030％以下，以及Fe和附带杂质，以及其制造方法。 钢板具有包括面积分数在0〜10％范围内的铁素体，面积分率在15〜60％的马氏体的微结构，面积分数在20〜50％范围内的回火马氏体， 和贝氏体铁素体，其面积分数在20〜50％的范围内。

公开(公告)号：US20250108423A1

公开(公告)日：2025-04-03

申请号：US18729887

申请日：2022-12-23

Applicant: JFE STEEL CORPORATION

Inventor： Rinta SATO ,  Yoichi MAKIMIZU

IPC: B21D22/02 ,  C22C19/00 ,  C22C19/03 ,  C22C19/05 ,  C23C14/16 ,  C23C14/32 ,  C25D3/12 ,  C25D3/56 ,  C25D7/06

Abstract: For a steel sheet for hot pressing having a coating layer to prevent scale formation, adhesion of metals to heating equipment is reduced, liquid metal embrittlement cracking during hot press forming is prevented, and excellent post-painting corrosion resistance is achieved. A coated steel sheet for hot pressing includes: a base steel sheet; and a coating layer of 7 μm to 20 μm in thickness provided on both sides of the base steel sheet, wherein the coating layer is made of Ni or a Ni-based alloy, and a Zn content in the coating layer is 0 mass % to 10 mass %.

公开(公告)号：US20240117517A1

公开(公告)日：2024-04-11

申请号：US18250978

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Takashi KAWANO ,  Takako YAMASHITA ,  Hiroshi MATSUDA ,  Yoichi MAKIMIZU

IPC: C25D3/20 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25D7/06

CPC classification number: C25D3/20 ,  C21D8/0236 ,  C21D8/0257 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25D7/0614

Abstract: Disclosed is an Fe-based electroplated steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of 5.0 g/m2 or more, in which in an intensity profile measured by glow discharge optical emission spectrometry, a peak of emission intensity at wavelengths indicating Si is detected within a range from a surface of the Fe-based electroplating layer to more than 0.2 μm in a thickness direction and not more than a thickness of the Fe-based electroplating layer, and an average value of C concentration in a region ranging from 10 μm to 20 μm in the thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.

公开(公告)号：US20240035105A1

公开(公告)日：2024-02-01

申请号：US18257178

申请日：2021-12-15

Applicant: JFE STEEL CORPORATION

Inventor： Takuya HIRASHIMA ,  Tatsuya NAKAGAITO ,  Masaki KOBA ,  Yoichi MAKIMIZU ,  Katsuya HATA ,  Shotaro TERASHIMA

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/38 ,  C22C38/06 ,  C23C2/06 ,  C23C2/40

CPC classification number: C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/02 ,  C22C38/38 ,  C22C38/06 ,  C22C38/002 ,  C23C2/06 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/002 ,  C21D2211/008

Abstract: Provided is a hot-dip galvanized steel sheet having both high strength and good workability, as well as excellent coating quality. The chemical composition of the base steel sheet is set within a specified range, the steel microstructure of the base steel sheet is a complex structure of ferrite, martensite and bainite, oxygen is present as oxides in the surface layer of the base steel sheet in an amount of 0.05 g/m2 or more and 0.50 g/m2 or less per surface, and the hot-dip galvanized layer contains Fe in an amount of 0.40 mass % or more.

公开(公告)号：US20230407485A1

公开(公告)日：2023-12-21

申请号：US18251269

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Mai AOYAMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Hiroshi MATSUDA ,  Ei OKUMURA ,  Yoichi MAKIMIZU ,  Masaki KOBA

IPC: C23C28/02 ,  C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C22C33/04 ,  C21D8/02 ,  C21D1/74 ,  C25D3/20 ,  C25D5/36

CPC classification number: C23C28/021 ,  C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C22C33/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D1/74 ,  C21D8/0278 ,  C25D3/20 ,  C25D5/36 ,  C21D2251/02 ,  C23C2/28

Abstract: Provided is an alloyed galvanized steel sheet with excellent resistance to cracking in resistance welding at a welded portion, even if crystal orientations of an Fe-based electroplating layer and a cold-rolled steel sheet are integrated at a high ratio at the interface between the Fe-based electroplating layer and the cold-rolled steel sheet. The alloyed galvanized steel sheet has a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % to 3.0 mass %; an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface exceeding 20.0 g/m2, and an alloyed galvanized layer formed on the Fe-based electroplating layer, where crystal orientations of the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet are integrated at a ratio of more than 50% at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet.

公开(公告)号：US20250163558A1

公开(公告)日：2025-05-22

申请号：US18839142

申请日：2023-01-05

Applicant: JFE STEEL CORPORATION

Inventor： Rinta SATO ,  Yoichi MAKIMIZU ,  Ryoto NISHIIKE ,  Minoru TANAKA

IPC: C23C2/12 ,  C22C21/00 ,  C22C21/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23C2/20 ,  C23C2/28

Abstract: Provided is a hot pressed member with excellent post-painting corrosion resistance and excellent corrosion resistance at lapped part. The hot pressed member includes: a steel material; an Al—Fe-based intermetallic compound layer with a thickness of 10 μm to 30 μm disposed on at least one side of the steel material; and Mg-containing oxide particles disposed on the Al—Fe-based intermetallic compound layer, wherein the Mg-containing oxide particles have an average particle size of 5.0 μm or less and a number density of 1000 particles/mm2 or more.

公开(公告)号：US20240009962A1

公开(公告)日：2024-01-11

申请号：US18251244

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Yusuke OKUMURA ,  Katsutoshi TAKASHIMA ,  Mai AOYAMA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Yoichi MAKIMIZU ,  Takashi KAWANO ,  Takako YAMASHITA ,  Hiroshi MATSUDA

IPC: B32B15/01 ,  C22C38/02 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D9/46 ,  C22C33/04 ,  C21D8/02 ,  C21D6/00 ,  C22C38/32 ,  C22C38/28 ,  C22C38/38 ,  C25D3/20 ,  C25D5/50 ,  C23F17/00 ,  C23C2/02 ,  C23C2/28 ,  C23C2/06

CPC classification number: B32B15/011 ,  C22C38/02 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C22C33/04 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C22C38/32 ,  C22C38/28 ,  C22C38/38 ,  C21D6/002 ,  C25D3/20 ,  C25D5/50 ,  B32B15/01 ,  C23F17/00 ,  C23C2/02 ,  C23C2/28 ,  C23C2/06

Abstract: To provide an Fe-based electroplated steel sheet that not only has excellent chemical convertibility or excellent coating appearance when subjected to hot-dip galvanizing, but also has excellent resistance to cracking in resistance welding. Disclosed is an Fe-based plated steel sheet including: a cold-rolled steel sheet having a chemical composition containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on one or both surfaces of the cold-rolled steel sheet with a coating weight per surface of 1.0 g/m2 or more, in which a thickness of an internal oxidation layer is 2.00 μm or less, and an average value of C concentration in a range of 10 μm to 20 μm in a thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.

公开(公告)号：US20230407506A1

公开(公告)日：2023-12-21

申请号：US18251396

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Mai AOYAMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Hiroshi MATSUDA ,  Ei OKUMURA ,  Yoichi MAKIMIZU ,  Masaki KOBA

IPC: C25D3/20 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C21D8/02 ,  C23C22/78 ,  C25D5/36 ,  C23C28/02

CPC classification number: C25D3/20 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C21D8/0236 ,  C21D8/0273 ,  C23C22/78 ,  C25D5/36 ,  C23C28/02 ,  C21D2201/05

Abstract: Provided is a steel sheet with excellent resistance to cracking in resistance welding at a welded portion, even if the crystal orientations of an Fe-based electroplating layer and a Si-containing cold-rolled steel sheet are integrated at a high ratio at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet. Provided is an Fe-based electroplated steel sheet having a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of more than 20.0 g/m2, where the crystal orientations of the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet are integrated at a ratio of more than 50% at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet.

公开(公告)号：US20230374639A1

公开(公告)日：2023-11-23

申请号：US18250979

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Takashi KAWANO ,  Takako YAMASHITA ,  Hiroshi MATSUDA ,  Yoichi MAKIMIZU

IPC: C23C2/40 ,  C21D8/02 ,  C21D9/46 ,  C23C2/06 ,  C22C38/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C25D3/20 ,  C25D5/36 ,  C25D5/50 ,  C25D7/06 ,  C23C28/02

CPC classification number: C23C2/40 ,  C21D8/0236 ,  C21D9/46 ,  C23C2/06 ,  C22C38/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C25D3/20 ,  C25D5/36 ,  C25D5/50 ,  C25D7/0614 ,  C23C28/021

Abstract: To provide a steel sheet with excellent resistance to cracking in resistance welding at a welded portion. Disclosed is a galvanized steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of 5.0 g/m2 or more; and a galvanized layer formed on the Fe-based electroplating layer, in which in an intensity profile measured by glow discharge optical emission spectrometry, ISi,Fe/ISi,bulk is 0.50 or more, and an average value of C concentration in a region ranging from 10 μm to 20 μm from an interface between the galvanized layer and the Fe-based electroplating layer towards the Fe-based electroplating layer is 0.10 mass % or less.