公开(公告)号：US20240344191A1

公开(公告)日：2024-10-17

申请号：US18735892

申请日：2024-06-06

Applicant: POSCO CO., LTD ,  STEEL & CONVERGENCE TECHNOLOGY RESEARCH ASSOCIATION ,  POSCO COATED & COLOR STEEL CO., LTD.

Inventor： Sung-Joo Kim ,  Kyung-Kwan Park ,  Moon-Hi Hong ,  Heung-Yun Kim ,  Tae-Yeul Park ,  Myung-Soo Kim ,  Il-Ryoung Sohn ,  Tae-Chul Kim ,  Dae-Young Kang

IPC: C23C2/06 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D7/06 ,  C22C18/00 ,  C22C18/04 ,  C23C2/00 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40 ,  C23C28/00 ,  C23C28/02 ,  C23C30/00

CPC classification number: C23C2/06 ,  B32B15/01 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D7/06 ,  C22C18/00 ,  C22C18/04 ,  C23C2/0035 ,  C23C2/02 ,  C23C2/285 ,  C23C2/29 ,  C23C2/40 ,  C23C28/02 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C28/322 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  Y10T428/12799 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/12993 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/24959 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/24983 ,  Y10T428/26 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

Abstract: Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al plating layer provided on at least one surface of the base steel sheet; and an Fe—Al inhibition layer provided between the base steel sheet and the Zn—Mg—Al plating layer. The plating layer comprises, by weight %, 4 to 10% of Mg and 5.1-25% of Al and the remainder being Zn and unavoidable impurities with respect to components not including iron (Fe) diffused from the base steel sheet. The plating layer comprises a 24-50% MgZn2 phase in phase fraction. In the MgZn2 phase, an Al single phase is present in the ratio of 1-30% relative to the cross-sectional area of the total MgZn2 phase.

公开(公告)号：US12098439B2

公开(公告)日：2024-09-24

申请号：US17915739

申请日：2021-03-25

Applicant: JFE STEEL CORPORATION

Inventor： Lingling Yang ,  Yoshiyasu Kawasaki ,  Tatsuya Nakagaito ,  Shotaro Terashima ,  Shunsuke Yamamoto ,  Katsuya Hoshino ,  Yuki Takeda

IPC: C22C38/60 ,  B21C47/02 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D1/18 ,  C21D1/25 ,  C21D1/76 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C28/00 ,  C23C28/02 ,  C23C30/00

CPC classification number: C21D9/46 ,  B21C47/02 ,  B32B15/013 ,  B32B15/015 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D1/185 ,  C21D1/25 ,  C21D1/76 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0242 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  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 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/285 ,  C23C2/29 ,  C23C2/40 ,  C23C28/021 ,  C23C28/025 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  Y10T428/12458 ,  Y10T428/12792 ,  Y10T428/12958 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/24983 ,  Y10T428/26 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/265

Abstract: A steel sheet having a tensile strength (TS) of 1180 MPa or more, high LME resistance, and good weld fatigue properties. The steel sheet has a specific chemical composition and a specific steel microstructure. Crystal grains containing an oxide of Si and/or Mn in a region within 4.9 μm in a thickness direction from a surface of the steel sheet have an average grain size in the range of 3 to 10 μm, the lowest Si concentration LSi and the lowest Mn concentration LMn in the region within 4.9 μm in the thickness direction from the surface of the steel sheet and a Si concentration TSi and a Mn concentration TMn at a quarter thickness position of the steel sheet satisfy a specified formula.

公开(公告)号：US20240309482A1

公开(公告)日：2024-09-19

申请号：US18273884

申请日：2022-03-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Takuya NISHIO ,  Masafumi AZUMA ,  Yoshimasa NARITA ,  Shintaro OKURA

IPC: C21D9/46 ,  C21D1/18 ,  C21D1/74 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/38 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/38 ,  C23C2/285 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: This cold-rolled steel sheet has a predetermined chemical composition, in which a metallographic structure of a t/4 portion, which is at a ¼ position of a sheet thickness t from a surface of the cold-rolled steel sheet in a sheet thickness direction has a predetermined structure, and in both an edge portion, which is at a position 50 mm away from an end portion of the cold-rolled steel sheet in a width direction, and a center portion of the cold-rolled steel sheet in the width direction, a metallographic structure of a 20 μm portion, which is at a position 20 μm away from the surface in the sheet thickness direction, includes, by volume percentage, ferrite and bainite: 75.0% or more and 100.0% or less in total, and martensite and tempered martensite: 0.0% or more and 25.0% or less in total, an average grain size of the martensite and the tempered martensite in the metallographic structure of the 20 μm portion is 5.0 μm or less, and a metallographic structure of a 75 μm portion, which is at a position 75 μm away from the surface in the sheet thickness direction, includes, by volume percentage, ferrite and bainite: 0.0% or more and 15.0% or less in total.

公开(公告)号：US12006576B2

公开(公告)日：2024-06-11

申请号：US17762533

申请日：2020-09-24

Applicant: POSCO ,  STEEL & CONVERGENCE TECHNOLOGY RESEARCH ASSOCIATION ,  POSCO COATED & COLOR STEEL CO., LTD.

Inventor： Sung-Joo Kim ,  Kyung-Kwan Park ,  Moon-Hi Hong ,  Heung-Yun Kim ,  Tae-Yeul Park ,  Myung-Soo Kim ,  Il-Ryoung Sohn ,  Tae-Chul Kim ,  Dae-Young Kang

IPC: C23C2/06 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D7/06 ,  C22C18/00 ,  C22C18/04 ,  C23C2/00 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40 ,  C23C28/00 ,  C23C28/02 ,  C23C30/00

CPC classification number: C23C2/06 ,  B32B15/01 ,  B32B15/013 ,  B32B15/04 ,  B32B15/043 ,  B32B15/18 ,  C21D7/06 ,  C22C18/00 ,  C22C18/04 ,  C23C2/0035 ,  C23C2/02 ,  C23C2/285 ,  C23C2/29 ,  C23C2/40 ,  C23C28/02 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C28/322 ,  C23C28/3225 ,  C23C30/00 ,  C23C30/005 ,  Y10T428/12951 ,  Y10T428/12958 ,  Y10T428/12972 ,  Y10T428/12979 ,  Y10T428/12993 ,  Y10T428/24942 ,  Y10T428/24983 ,  Y10T428/263 ,  Y10T428/265

Abstract: Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al plating layer provided on at least one surface of the base steel sheet; and an Fe—Al inhibition layer provided between the base steel sheet and the Zn—Mg—Al plating layer. The plating layer comprises, by weight %, 4 to 10% of Mg and 5.1-25% of Al and the remainder being Zn and unavoidable impurities with respect to components not including iron (Fe) diffused from the base steel sheet. The plating layer comprises a 24-50% MgZn2 phase in phase fraction. In the MgZn2 phase, an Al single phase is present in the ratio of 1-30% relative to the cross-sectional area of the total MgZn2 phase.

公开(公告)号：US20240150864A1

公开(公告)日：2024-05-09

申请号：US18548970

申请日：2022-02-25

Applicant: JFE STEEL CORPORATION

Inventor： Satoshi MAEDA ,  Nao KAWABE ,  Hiromi YOSHITOMI

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/28

CPC classification number: C21D9/46 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/285

Abstract: To provide a galvanized steel sheet having high strength; specifically, with a tensile strength of 1160 MPa or more and excellent resistance spot weldability. A chemical composition of a base steel sheet contains one or more of Ti, Nb, V, and Zr: 0.02% or more and 0.20% or less in total, and an amount of diffusible hydrogen in a zinc or zinc alloy coating layer is 0.40 mass ppm or less.

公开(公告)号：US09982318B2

公开(公告)日：2018-05-29

申请号：US15405819

申请日：2017-01-13

Applicant: JFE Steel Corporation

Inventor： Shinjiro Kaneko ,  Tatsuya Nakagaito ,  Hiroshi Hasegawa ,  Yasunobu Nagataki

IPC: C21D9/46 ,  C23C2/06 ,  B32B15/01 ,  C23C2/28 ,  C23C2/40 ,  C21D8/02 ,  C21D1/34 ,  C22C18/04 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/34 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/008 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/285 ,  C23C2/40 ,  Y02P10/212

Abstract: A galvanized steel sheet has formability and crashworthiness, consists of 0.03% to 0.13% C, 1.0% to 2.0% Si, 2.4% to 3.5% Mn, 0.001% to 0.05% P, 0.0001% to 0.01% S, 0.001% to 0.1% Al, 0.0005% to 0.01% N, and 0.0003% to 0.01% B on a mass basis; and optionally contains at least one selected from the following A-C: A: at least one selected from the group consisting of 0.0005% to 0.1% Ti and 0.0005% to 0.05% Nb on a mass basis; B: at least one selected from the group consisting of 0.01% to 1.0% Mo, 0.01% to 2.0% Ni, and 0.01% to 2.0% Cu on a mass basis; and C: 0.001% to 0.005% Ca on a mass basis; the remainder being Fe and unavoidable impurities, and a microstructure containing a tempered martensitic phase and a bainitic phase such that the sum of an area fraction of the tempered martensitic phase and an area fraction of the bainitic phase is 30% or more, the area fraction of the tempered martensitic phase is 30% or more in the absence of the bainitic phase, wherein a distance of closest approach of the tempered martensitic phase is 10 μm or less and contents of C, Mn, and B satisfy (1): (% Mn)+1000×(% B)≥35×(% C)  (1).

公开(公告)号：US09873934B2

公开(公告)日：2018-01-23

申请号：US15021508

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C23C2/40 ,  C23C2/02 ,  C23C2/06 ,  C21D9/56 ,  C22C18/04 ,  C22C38/00 ,  C23C8/10 ,  C23C8/26 ,  C23C8/34 ,  C21D1/74 ,  C21D1/76 ,  C21D8/02 ,  C21D1/52 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C23C2/28 ,  B32B15/01 ,  C22C18/00 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/44 ,  C22C38/54

CPC classification number: C23C2/40 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/285 ,  C23C8/10 ,  C23C8/26 ,  C23C8/34

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition including, on a mass basis: C: 0.20% to 0.50%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 4 μm or less, the decarburized layer having a thickness of 16 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

公开(公告)号：US20170130293A1

公开(公告)日：2017-05-11

申请号：US15405819

申请日：2017-01-13

Applicant: JFE Steel Corporation

Inventor： Shinjiro Kaneko ,  Tatsuya Nakagaito ,  Hiroshi Hasegawa ,  Yasunobu Nagataki

IPC: C21D9/46 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D8/02 ,  C21D1/34 ,  C22C18/04 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/34 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/008 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/285 ,  C23C2/40 ,  Y02P10/212

Abstract: A galvanized steel sheet has formability and crashworthiness, consists of 0.03% to 0.13% C, 1.0% to 2.0% Si, 2.4% to 3.5% Mn, 0.001% to 0.05% P, 0.0001% to 0.01% S, 0.001% to 0.1% Al, 0.0005% to 0.01% N, and 0.0003% to 0.01% B on a mass basis; and optionally contains at least one selected from the following A-C: A: at least one selected from the group consisting of 0.0005% to 0.1% Ti and 0.0005% to 0.05% Nb on a mass basis; B: at least one selected from the group consisting of 0.01% to 1.0% Mo, 0.01% to 2.0% Ni, and 0.01% to 2.0% Cu on a mass basis; and C: 0.001% to 0.005% Ca on a mass basis; the remainder being Fe and unavoidable impurities, and a microstructure containing a tempered martensitic phase and a bainitic phase such that the sum of an area fraction of the tempered martensitic phase and an area fraction of the bainitic phase is 30% or more, the area fraction of the tempered martensitic phase is 30% or more in the absence of the bainitic phase, wherein a distance of closest approach of the tempered martensitic phase is 10 μm or less and contents of C, Mn, and B satisfy (1): (% Mn)+1000×(% B)≧35×(% C)  (1).

公开(公告)号：US20170009315A1

公开(公告)日：2017-01-12

申请号：US15120695

申请日：2015-03-04

Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)

Inventor： Kosuke SHIBATA ,  Toshio MURAKAMI ,  Muneaki IKEDA ,  Michiharu NAKAYA

IPC: C21D9/46 ,  C23C2/28 ,  C23C2/40 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C23C2/06

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28 ,  C23C2/285 ,  C23C2/40

Abstract: The present disclosure relates to a high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability and having a component composition containing, in mass %, C: from 0.05 to 030%, Si: from 0.5 to 3.0%, Mn: from 0.2 to 3.0%, P: from 0 to 0.10%, S: from 0 to 0.010%, N: form 0 to 0.010%, and Al: from 0.001 to 0.10%, with the remainder being iron and unavoidable impurities. The steel sheet has a steel structure containing, in terms of area percentage, martensite: form 50 to 85% and ferrite: 0% or more and less than 5%, with the remainder being bainite. The steel sheet has a dislocation density of 5.0×1015 m−2 or more, a solute carbon amount of 0.08 mass % or more and a tensile strength of 1180 MPa or more.

Abstract translation: 本公开内容涉及一种烘烤硬化性和弯曲性优异的高强度热浸镀锌合金化钢板，其组成成分以质量％计含有C：0.05〜030％，Si：0.5〜3.0％，Mn： 0.2〜3.0％，P：0〜0.10％，S：0〜0.010％，N：0〜0.010％，Al：0.001〜0.10％，余量为铁和不可避免的杂质。 钢板具有以面积率计，马氏体：50〜85％，铁素体：0％以上且小于5％的钢结构，其余为贝氏体。 钢板的位错密度为5.0×1015m-2以上，溶质碳量为0.08质量％以上，拉伸强度为1180MPa以上。

公开(公告)号：US09322091B2

公开(公告)日：2016-04-26

申请号：US14375053

申请日：2013-01-28

Applicant: JFE STEEL CORPORATION

Inventor： Hideyuki Kimura ,  Katsutoshi Takashima ,  Shinjiro Kaneko

IPC: C23C2/02 ,  C21D1/26 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C2/28 ,  C22C38/26 ,  C22C38/30 ,  C22C38/10 ,  C25D5/36 ,  C25D5/38 ,  C25D5/50 ,  C25D3/22 ,  C23C2/06 ,  C23C2/26 ,  C21D9/46 ,  C22C38/58

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D1/26 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38 ,  C22C38/58 ,  C22C38/60 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/285 ,  C25D3/22 ,  C25D5/36 ,  C25D5/38 ,  C25D5/50 ,  Y10T428/12799 ,  Y10T428/12972

Abstract: There is provided a high-strength galvanized steel sheet including, on a mass percent basis, C: more than 0.060% and 0.13% or less, Si: 0.01% or more and 0.7% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005% or more and 0.100% or less, N: 0.0100% or less, Nb: 0.005% or more and 0.10% or less, Ti: 0.03% or more and 0.15% or less, and the balance comprising Fe and incidental impurities, satisfying the relationship of (Nb/93+Ti*/48)/(C/12)>0.08 (wherein Ti*=Ti−(48/14)N−(48/32)S). The high-strength galvanized steel sheet has a structure including ferrite and martensite. The ferrite has an average grain diameter of 15 μm or less and an area percentage of 80% or more. The martensite has an area percentage of 1% or more and 15% or less.

Abstract translation: 提供了以质量％计含有C：大于0.060％和0.13％以下，Si：0.01％以上且0.7％以下，Mn：1.0％以上且3.0以下的高强度镀锌钢板 ％以下，P：0.005％以上且0.100％以下，S：0.010％以下，sol.Al：0.005％以上且0.100％以下，N：0.0100％以下，Nb：0.005％以上 和0.10％以下，Ti：0.03％以上且0.15％以下，余量包含Fe和附带杂质，满足（Nb / 93 + Ti * / 48）/（C / 12）> 0.08（ 其中Ti * = Ti-（48/14）N-（48/32）S）。 高强度镀锌钢板具有铁素体和马氏体的结构。 铁素体的平均粒径为15μm以下，面积率为80％以上。 马氏体的面积率为1％以上且15％以下。