EP2225402A1 - A method of producing a painted steel sheet product of high strength - Google Patents

A method of producing a painted steel sheet product of high strength

Info

Publication number
EP2225402A1
EP2225402A1 EP08855006A EP08855006A EP2225402A1 EP 2225402 A1 EP2225402 A1 EP 2225402A1 EP 08855006 A EP08855006 A EP 08855006A EP 08855006 A EP08855006 A EP 08855006A EP 2225402 A1 EP2225402 A1 EP 2225402A1
Authority
EP
European Patent Office
Prior art keywords
blank
tools
product
producing
high strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08855006A
Other languages
German (de)
English (en)
French (fr)
Inventor
Paul ÅKERSTRÖM
Jan Erik Larsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gestamp Hardtech AB
Original Assignee
Gestamp Hardtech AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gestamp Hardtech AB filed Critical Gestamp Hardtech AB
Publication of EP2225402A1 publication Critical patent/EP2225402A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • Press-hardening is an established method of shaping and hardening blanks of sheet steel to a high strength product. This method is used in particular for producing high-strength beams and rails and other components for the vehicle industri. A corrosion protection is often needed and can be provided by painting when the skin, that is, the thick and brittle oxide formed in the process, has been removed by abrasive blasting.
  • a thin and smooth layer of black oxide can be established before the hot stamping and then the product can be painted directly on this oxide layer.
  • a corrosion protection can be achieved that is in parity with or even better than the protection that can be provided by abrasive blasting and subsequent painting. It is also a less costly method.
  • Black oxide is well known for example from US 7,115,174 B2 and comprises FeO as a main component.
  • the teaching of US 7,115,174 B2 is incorporated by way of reference.
  • a steel strip is used that is pre-oxidized to have a black oxide surface, that is, a thin smooth layer of black oxide.
  • This oxide is not brittle and porous as ordinary oxide and it does not absorb moisture.
  • a blank is cut from this strip and the blank is heated to austenite state in a furnace with inert or slightly reducing or possibly slightly oxidizing atmosphere.
  • the furnace may have sections with sequentially varying atmosphere.
  • the heated blank is quickly moved to the shaping pair of tools in which it is hot stamped.
  • the pair of tools is cooled, usually by internal water channels coupled to an external source, and the shaped product is kept in the tools with the tools as a fixture until the product has hardened by being rapidly cooled. Martensite is dominant in the hardened structure.
  • the blank is cut from an unoxidized strip, and heated to austenite state in a furnace with a slightly oxidizing atmosphere so that the black oxide is formed in the furnace.
  • the furnace may have sections with sequentially varying atmosphere.
  • the blank with a surface of black oxide can be moved from the furnace to the stamping tools so fast that a protective atmosphere is not needed for the transport, but a protective atmosphere may be preferable.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
EP08855006A 2007-11-26 2008-11-11 A method of producing a painted steel sheet product of high strength Withdrawn EP2225402A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0702597A SE531689C2 (sv) 2007-11-26 2007-11-26 Sätt att framställa en lackerad höghållfast produkt
PCT/SE2008/000637 WO2009070078A1 (en) 2007-11-26 2008-11-11 A method of producing a painted steel sheet product of high strength

Publications (1)

Publication Number Publication Date
EP2225402A1 true EP2225402A1 (en) 2010-09-08

Family

ID=40678812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08855006A Withdrawn EP2225402A1 (en) 2007-11-26 2008-11-11 A method of producing a painted steel sheet product of high strength

Country Status (8)

Country Link
US (1) US20100269957A1 (https=)
EP (1) EP2225402A1 (https=)
JP (1) JP2011505491A (https=)
KR (1) KR20100108355A (https=)
CN (1) CN101883871B (https=)
SE (1) SE531689C2 (https=)
WO (1) WO2009070078A1 (https=)
ZA (1) ZA201003638B (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112513310A (zh) 2018-05-24 2021-03-16 通用汽车环球科技运作有限责任公司 改善压制硬化钢的强度和延性的方法
CN112534078A (zh) * 2018-06-19 2021-03-19 通用汽车环球科技运作有限责任公司 具有增强的机械性质的低密度压制硬化钢

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556871A (en) * 1968-04-15 1971-01-19 Allegheny Ludlum Steel Method of making black stainless steel sheet
JPS6415356A (en) * 1987-07-08 1989-01-19 Kobe Steel Ltd Hot-rolled steel sheet excellent in adhesive strength of scale and its production
JPH0234793A (ja) * 1988-07-26 1990-02-05 Kobe Steel Ltd スケール密着性の優れた加工用高強度熱延鋼板の製造方法
JPH03285024A (ja) * 1990-03-30 1991-12-16 Nippon Steel Corp プレス成形性に優れた冷延鋼板
JPH07173601A (ja) * 1993-12-18 1995-07-11 Kobe Steel Ltd 鋼帯の連続浸炭炉及び連続浸炭方法
JPH0874027A (ja) * 1994-09-05 1996-03-19 Toyota Motor Corp 浸炭処理方法
SE9602257L (sv) * 1996-06-07 1997-12-08 Plannja Hardtech Ab Sätt att framställa ståldetalj
US6695931B1 (en) * 1999-05-24 2004-02-24 Birchwood Laboratories, Inc. Composition and method for metal coloring process
CN100434564C (zh) * 2001-10-23 2008-11-19 住友金属工业株式会社 热压成型方法,其电镀钢材及其制备方法
DE502004011583D1 (de) * 2003-07-29 2010-10-07 Voestalpine Automotive Gmbh Verfahren zum herstellen von geharteten bauteilen aus stahlblech
JP4447270B2 (ja) * 2003-08-29 2010-04-07 豊田鉄工株式会社 熱間プレス用めっき鋼板の加熱処理方法
JP2005138111A (ja) * 2003-11-04 2005-06-02 Nippon Steel Corp 鋼板の熱間プレス成形方法及び装置
JP4072129B2 (ja) * 2004-02-24 2008-04-09 新日本製鐵株式会社 亜鉛系めっきが施された熱間プレス鋼材
JP4860542B2 (ja) * 2006-04-25 2012-01-25 新日本製鐵株式会社 高強度自動車部品およびその熱間プレス方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009070078A1 *

Also Published As

Publication number Publication date
US20100269957A1 (en) 2010-10-28
KR20100108355A (ko) 2010-10-06
CN101883871B (zh) 2012-10-03
SE0702597L (sv) 2009-05-27
SE531689C2 (sv) 2009-07-07
JP2011505491A (ja) 2011-02-24
CN101883871A (zh) 2010-11-10
ZA201003638B (en) 2011-03-30
WO2009070078A1 (en) 2009-06-04

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