US20200347479A1 - High-strength electrogalvannealed steel sheet and method for manufacturing the same - Google Patents

High-strength electrogalvannealed steel sheet and method for manufacturing the same Download PDF

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Publication number
US20200347479A1
US20200347479A1 US16/960,733 US201816960733A US2020347479A1 US 20200347479 A1 US20200347479 A1 US 20200347479A1 US 201816960733 A US201816960733 A US 201816960733A US 2020347479 A1 US2020347479 A1 US 2020347479A1
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steel sheet
electrogalvannealed
strength
content
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US16/960,733
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English (en)
Inventor
Mai AOYAMA
Kazuaki Tsuchimoto
Yusuke Fushiwaki
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JFE Steel Corp
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JFE Steel Corp
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Assigned to JFE STEEL CORPORATION reassignment JFE STEEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUSHIWAKI, YUSUKE, TSUCHIMOTO, Kazuaki, AOYAMA, Mai
Publication of US20200347479A1 publication Critical patent/US20200347479A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc

Definitions

  • the diffusible hydrogen content in a steel sheet greatly affects formability and delayed fracture resistance, and thus there is a need to reduce the hydrogen content.
  • Hydrogen taken into a steel sheet during annealing is released in the cooling and subsequent processes.
  • the release rate is low, and thus a sufficient amount of hydrogen is not released in a normal continuous hot-dip galvanization process, so that hydrogen remains in the steel sheet.
  • the hydrogen release is greatly affected by the hydrogen concentration in an atmosphere, the hydrogen release is found to be promoted by holding the steel sheet in a low-hydrogen atmosphere after annealing.
  • the steel sheet surface is slightly oxidized in a low-hydrogen atmosphere and bare spots are generated when the steel sheet is immersed in a hot-dip galvanizing bath.
  • Silicon Si is effective in ensuring good ductility since Si improves the work hardenability of ferrite. If the Si content is less than 0.01%, the effect of Si is insufficient. The lower limit of the Si content is thus 0.01%. Therefore, the Si content is 0.01% or more, preferably 0.20% or more, and more preferably 0.50% or more. An excessive Si content of more than 3.00% results in not only embrittlement of steel but also deterioration of surface texture due to generation of red scales and the like. Therefore, the Si content is 3.00% or less, preferably 2.00% or less, and more preferably 1.80% or less.
  • the balance other than the components described above is Fe and unavoidable impurities.
  • Aluminum Al is an element that expands a two-phase region including ferrite and austenite and that is effective in reducing the annealing temperature dependence, that is, effective in material quality stability.
  • Aluminum Al is also an element that works as a deoxidizer and is effective in steel cleanliness.
  • Aluminum Al is preferably added in the deoxidizing step. If the Al content is less than 0.01%, the effect of Al added is insufficient. From these viewpoints, when Al is added, the Al content is 0.01% or more, preferably 0.02% or more, and more preferably 0.03% or more. However, an Al content of more than 2.00% results in a high risk of slab cracking during continuous casting and thus leads to low productivity. From these viewpoints, when Al is added, the Al content is 2.00% or less, preferably 1.20% or less, and more preferably 0.80% or less.
  • Copper Cu is an element effective in strengthening steel and can be used to strengthen steel within a range specified in accordance with aspects of the present invention. Such an effect is obtained when the Cu content is 0.005% or more. Therefore, when Cu is added, the Cu content is 0.005% or more, preferably 0.008% or more, and more preferably 0.010% or more. However, if the Cu content is more than 1.000%, hard martensite is excessively formed, and a large number of microvoids are generated at martensite grain boundaries, and furthermore crack propagation proceeds to degrade formability. Therefore, when Cu is added, the Cu content is 1.000% or less, preferably 0.800% or less, and more preferably 0.500% or less.
  • Electrogalvanization is a step of forming an electrogalvanized coating layer on the steel sheet surface by cooling the steel sheet that has been subjected to the heat treatment step.
  • the electrogalvanization conditions are not specified, but the current density is preferably 30 to 1200 A/dm 2 .
  • the steel sheet is preferably pickled before electrogalvanization. Since there is no need to completely remove oxides, the pickling solution is not specified, and any one of acids, such as hydrochloric acid, sulfuric acid, and nitric acid, can be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Coating With Molten Metal (AREA)
US16/960,733 2018-01-17 2018-12-13 High-strength electrogalvannealed steel sheet and method for manufacturing the same Abandoned US20200347479A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018005418 2018-01-17
JP2018-005418 2018-01-17
PCT/JP2018/045856 WO2019142559A1 (ja) 2018-01-17 2018-12-13 高強度合金化電気亜鉛めっき鋼板およびその製造方法

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US18/199,451 Pending US20230287534A1 (en) 2018-01-17 2023-05-19 High-strength electrogalvannealed steel sheet and method for manufacturing the same

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US (2) US20200347479A1 (ja)
EP (1) EP3741878B1 (ja)
JP (1) JP6838665B2 (ja)
KR (1) KR102561381B1 (ja)
CN (1) CN111601906B (ja)
MX (1) MX2020007610A (ja)
WO (1) WO2019142559A1 (ja)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN115418580B (zh) * 2022-09-29 2023-06-23 山东建筑大学设计集团有限公司 一种耐延迟断裂的高强度螺栓用钢的制备方法

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WO2016038801A1 (ja) * 2014-09-08 2016-03-17 Ｊｆｅスチール株式会社 高強度溶融亜鉛めっき鋼板の製造方法及び製造設備

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Publication number Priority date Publication date Assignee Title
US5015341A (en) * 1988-08-05 1991-05-14 Armco Steel Company, L.P. Induction galvannealed electroplated steel strip
WO2016038801A1 (ja) * 2014-09-08 2016-03-17 Ｊｆｅスチール株式会社 高強度溶融亜鉛めっき鋼板の製造方法及び製造設備
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US20230287534A1 (en) 2023-09-14
MX2020007610A (es) 2020-09-03
WO2019142559A1 (ja) 2019-07-25
EP3741878A1 (en) 2020-11-25
KR102561381B1 (ko) 2023-07-28
JPWO2019142559A1 (ja) 2020-04-02
CN111601906A (zh) 2020-08-28
EP3741878B1 (en) 2022-07-06
EP3741878A4 (en) 2021-01-06
KR20200093048A (ko) 2020-08-04
CN111601906B (zh) 2022-05-31
JP6838665B2 (ja) 2021-03-03

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