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US20100269957A1 - Method of producing a painted steel shaft product of high strength - Google Patents

Method of producing a painted steel shaft product of high strength Download PDF

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Publication number
US20100269957A1
US20100269957A1 US12/734,712 US73471208A US2010269957A1 US 20100269957 A1 US20100269957 A1 US 20100269957A1 US 73471208 A US73471208 A US 73471208A US 2010269957 A1 US2010269957 A1 US 2010269957A1
Authority
US
United States
Prior art keywords
blank
product
tools
heated
producing
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.)
Abandoned
Application number
US12/734,712
Inventor
Paul Akerstrom
Jan Rolf 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
Assigned to GESTAMP HARDTECH AB reassignment GESTAMP HARDTECH AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKERSTROM, PAUL, LARSSON, JAN ERIK
Publication of US20100269957A1 publication Critical patent/US20100269957A1/en
Abandoned 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 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 U.S. Pat. No. 7,115,174 B2 and comprises FeO as a main component.
  • the teaching of U.S. Pat. No. 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)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A high-strength product of sheet steel is produced in the press hardening process. A blank is heated to reach austenite structure and hot-stamped in a pair of cooled tools. The product is kept in the tools to rapidly be cooled to harden with the tools as a fixture. The blank has a surface of black oxide before it is shaped and the shaped product is painted directly on the black surface.

Description

    BACKGROUND OF THE INVENTION AND A BRIEF DESCRIPTION OF THE INVENTION
  • 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.
  • According to the invention, 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. In this way, 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 U.S. Pat. No. 7,115,174 B2 and comprises FeO as a main component. The teaching of U.S. Pat. No. 7,115,174 B2 is incorporated by way of reference.
  • The invention is defined by the claims.
    • DESCRIPTION OF THE INVENTION
  • In one way of carrying out the invention, 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.
  • In another way of carrying out the invention, 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. Also in this case, the furnace may have sections with sequentially varying atmosphere.
  • In both examples, 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.

Claims (3)

1. A method of producing a painted high strength product of sheet steel, wherein a sheet steel blank is heated to austenitic state and hot stamped and hardened in a cooled pair of tools, characterised in that a blank is used that has a black oxide layer of 1-5 μm, and the shaped and hardened product is painted on the black oxide layer.
2. A method according to claim 1, characterised in that the blank is cut from a strip having a surface of black oxide, and the blank is heated in a furnace with inert or slightly oxidising atmosphere.
3. A method according to claim 1, characterised in that the blank is cut from an unoxidised band and the blank is heated in a furnace with a slightly oxidising atmosphere.
US12/734,712 2007-11-26 2008-11-11 Method of producing a painted steel shaft product of high strength Abandoned US20100269957A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0702597-6 2007-11-26
SE0702597A SE531689C2 (en) 2007-11-26 2007-11-26 Ways to make a lacquered high-strength product
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
US20100269957A1 true US20100269957A1 (en) 2010-10-28

Family

ID=40678812

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/734,712 Abandoned US20100269957A1 (en) 2007-11-26 2008-11-11 Method of producing a painted steel shaft product of high strength

Country Status (8)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11612926B2 (en) * 2018-06-19 2023-03-28 GM Global Technology Operations LLC Low density press-hardening steel having enhanced mechanical properties
US11613789B2 (en) 2018-05-24 2023-03-28 GM Global Technology Operations LLC Method for improving both strength and ductility of a press-hardening steel

Citations (4)

* 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
US5916389A (en) * 1996-06-07 1999-06-29 Ssab Hardtech Ab Method of producing a sheet steel product such as a reinforcement element in a larger structure
US6695931B1 (en) * 1999-05-24 2004-02-24 Birchwood Laboratories, Inc. Composition and method for metal coloring process
US20070000117A1 (en) * 2003-07-29 2007-01-04 Werner Brandstatter Method for producing hardened parts from sheet steel

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (en) * 1988-07-26 1990-02-05 Kobe Steel Ltd Production of high-strength hot-rolled steel sheet to be worked having excellent scale adhesion
JPH03285024A (en) * 1990-03-30 1991-12-16 Nippon Steel Corp Cold-rolled steel sheet with excellent press formability
JPH07173601A (en) * 1993-12-18 1995-07-11 Kobe Steel Ltd Continuous carburizing furnace and continuous carburizing method of steel strip
JPH0874027A (en) * 1994-09-05 1996-03-19 Toyota Motor Corp Carburization treatment
ATE468416T1 (en) * 2001-10-23 2010-06-15 Sumitomo Metal Ind METHOD FOR HOT PRESSING A PLATED STEEL PRODUCT
JP4447270B2 (en) * 2003-08-29 2010-04-07 豊田鉄工株式会社 Heat treatment method for plated steel sheet for hot press
JP2005138111A (en) * 2003-11-04 2005-06-02 Nippon Steel Corp Steel plate hot press forming method and apparatus
JP4072129B2 (en) * 2004-02-24 2008-04-09 新日本製鐵株式会社 Hot pressed steel with zinc-based plating
JP4860542B2 (en) * 2006-04-25 2012-01-25 新日本製鐵株式会社 High strength automobile parts and hot pressing method thereof

Patent Citations (4)

* 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
US5916389A (en) * 1996-06-07 1999-06-29 Ssab Hardtech Ab Method of producing a sheet steel product such as a reinforcement element in a larger structure
US6695931B1 (en) * 1999-05-24 2004-02-24 Birchwood Laboratories, Inc. Composition and method for metal coloring process
US20070000117A1 (en) * 2003-07-29 2007-01-04 Werner Brandstatter Method for producing hardened parts from sheet steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11613789B2 (en) 2018-05-24 2023-03-28 GM Global Technology Operations LLC Method for improving both strength and ductility of a press-hardening steel
US11612926B2 (en) * 2018-06-19 2023-03-28 GM Global Technology Operations LLC Low density press-hardening steel having enhanced mechanical properties
US11951522B2 (en) 2018-06-19 2024-04-09 GM Global Technology Operations LLC Low density press-hardening steel having enhanced mechanical properties

Also Published As

Publication number Publication date
SE0702597L (en) 2009-05-27
EP2225402A1 (en) 2010-09-08
ZA201003638B (en) 2011-03-30
KR20100108355A (en) 2010-10-06
WO2009070078A1 (en) 2009-06-04
SE531689C2 (en) 2009-07-07
JP2011505491A (en) 2011-02-24
CN101883871B (en) 2012-10-03
CN101883871A (en) 2010-11-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GESTAMP HARDTECH AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AKERSTROM, PAUL;LARSSON, JAN ERIK;REEL/FRAME:024439/0870

Effective date: 20100517

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

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