EP1423219B1 - A method for manufacturing an ultra-high-tensile, expanded metal of steel - Google Patents

A method for manufacturing an ultra-high-tensile, expanded metal of steel Download PDF

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Publication number
EP1423219B1
EP1423219B1 EP02765741A EP02765741A EP1423219B1 EP 1423219 B1 EP1423219 B1 EP 1423219B1 EP 02765741 A EP02765741 A EP 02765741A EP 02765741 A EP02765741 A EP 02765741A EP 1423219 B1 EP1423219 B1 EP 1423219B1
Authority
EP
European Patent Office
Prior art keywords
work piece
yield point
temperature
forming operation
final product
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.)
Expired - Lifetime
Application number
EP02765741A
Other languages
German (de)
French (fr)
Other versions
EP1423219A1 (en
Inventor
Leif Carlsson
Hans Groth
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of EP1423219A1 publication Critical patent/EP1423219A1/en
Application granted granted Critical
Publication of EP1423219B1 publication Critical patent/EP1423219B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • 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
    • C21D6/04—Hardening by cooling below 0 degrees Celsius

Definitions

  • the present invention relates to a method for manufacturing an ultra-high-tensile expanded metal of steel.
  • an expanded metal When manufacturing an expanded metal one usually starts from metallic work pieces, preferably of soft steel with good forming properties. During the forming operation one achieves a certain degree of deformation hardening, which however is insufficient for obtaining an ultra-high-tensile final product. In case one should start from a material that initially is ultra-high-tensile with a yield point preferably more than 700 MPa, this material would not have sufficient ductility to be formed to expanded metal. This is so because the material would break during the forming operation.
  • US 2,018,085 disclose a method of making expanded metal of stainless steel.
  • the work piece is plastically treated, by conventional methods, in order to form the expanded metal, whereupon the material becomes deformation hardened.
  • US 2,018,085 there are attempts to avoid deformation hardening.
  • the object of the present invention is to provide a method for manufacturing an ultra-high-tensile expanded metal, which is constituted of iron that has been alloyed to give a strong deformation hardening when being subjected to plastic cold machining in combination with maintaining good ductility of the alloy at the same time as the final product achieves a yield point more than 700 MPa.
  • the expanded metal manufactured according to the invention is constituted of a work piece of iron, which has been alloyed with chromium, nickel and carbon in predetermined proportions.
  • the iron is alloyed with 17% Cr, 7% Ni and 0,1% C or alloys closely related to these and that the temperature of the work piece before and/or during the manufacturing operation has achieved or is kept at a controlled level, wherein a strong but controlled deformation hardening is achieved when plastic cold working the work piece in combination with maintaining a good ductility of the alloy.
  • the temperature of the finally formed expanded metal is controlled after the working operation.
  • the alloyed metal work piece that forms the initial work piece is formed in traditional machines for expanded metal fabrication to increase its yield point from an original, low yield point of about 300 MPa to a final product that completely or partially obtains a yield point of more than 700 MPa.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention relates to a method for manufacturing an ultra-hig-tensile expanded metal of steel. The initial work piece used and constituted of a metal work piece of iron, which has been alloyed with chromium, nickel and carbon in predetermined proportions, is plastically cold worked in order to, during controlled temperature conditions with respect to the metal, that is to say the work piece and fina product, provide a strong deformation hardening at the same time as the alloy maintains a good ductility.

Description

  • The present invention relates to a method for manufacturing an ultra-high-tensile expanded metal of steel.
  • When manufacturing an expanded metal one usually starts from metallic work pieces, preferably of soft steel with good forming properties. During the forming operation one achieves a certain degree of deformation hardening, which however is insufficient for obtaining an ultra-high-tensile final product. In case one should start from a material that initially is ultra-high-tensile with a yield point preferably more than 700 MPa, this material would not have sufficient ductility to be formed to expanded metal. This is so because the material would break during the forming operation.
  • US 2,018,085 disclose a method of making expanded metal of stainless steel. The work piece is plastically treated, by conventional methods, in order to form the expanded metal, whereupon the material becomes deformation hardened. In the method according to US 2,018,085 , there are attempts to avoid deformation hardening.
  • The object of the present invention is to provide a method for manufacturing an ultra-high-tensile expanded metal, which is constituted of iron that has been alloyed to give a strong deformation hardening when being subjected to plastic cold machining in combination with maintaining good ductility of the alloy at the same time as the final product achieves a yield point more than 700 MPa. These objects can be achieved by a method according to claim 1.
  • Thanks to the invention one has now provided a method for manufacturing an ultra-high-tensile expanded metal of steel, which in an excellent manner fulfils its object at the same time as the manufacture can take place very rationally with already existing machines to low cost.
  • The invention is described in more detail with the aid of the embodiment below.
  • In a preferred embodiment of the invention, the expanded metal manufactured according to the invention is constituted of a work piece of iron, which has been alloyed with chromium, nickel and carbon in predetermined proportions. In the example chosen the iron is alloyed with 17% Cr, 7% Ni and 0,1% C or alloys closely related to these and that the temperature of the work piece before and/or during the manufacturing operation has achieved or is kept at a controlled level, wherein a strong but controlled deformation hardening is achieved when plastic cold working the work piece in combination with maintaining a good ductility of the alloy. Furthermore, the temperature of the finally formed expanded metal is controlled after the working operation. The alloyed metal work piece that forms the initial work piece is formed in traditional machines for expanded metal fabrication to increase its yield point from an original, low yield point of about 300 MPa to a final product that completely or partially obtains a yield point of more than 700 MPa.

Claims (6)

  1. A method for manufacturing an ultra-high-tensile expanded metal of steel, in which method the initial work piece used and constituted of a metal work piece of iron alloyed with chromium, nickel and carbon in predetermined proportions, characterized in that the initial metal work piece is plastically cold worked to provide a strong deformation hardening that gives the final product a strong, many times increased strength or yield point, as compared to the yield point of the initial work piece, which original low yield point is about 300 MPa and the higher one is more than 700 MPa, whereby the initial work piece is cooled to or is kept at a controlled temperature before and during the forming operation to obtain a controlled, maximal strength independently of the degree of deformation during the forming operation.
  2. A method according to claim 1, characterized in that the work piece consisting of iron that is plastically worked is alloyed with 17% Cr, 7% Ni and 0,1% C or closely related alloys.
  3. A method according to claim 1 or 2, characterized in that the temperature to which the work piece has been cooled or the temperature that is maintained during the forming operation is about -196 ≤ T ≤ 70°C.
  4. A method according to any of the preceding claims, characterized in that the final product is cooled or is kept at a controlled temperature to obtain a controlled maximal strength independently of the degree of deformation during the forming operation.
  5. A method according to claim 4, characterized in that the temperature to which the final product is cooled or the temperature that is maintained after the forming operation is about -196 ≤ T ≤ 70°C.
  6. A method according to claim 1, characterized in that the alloyed work piece is formed in traditional machines for manufacturing expanded metals to increase its yield point from an original low yield point to a final product that completely or partially obtains a higher yield point.
EP02765741A 2001-09-05 2002-09-04 A method for manufacturing an ultra-high-tensile, expanded metal of steel Expired - Lifetime EP1423219B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0102943 2001-09-05
SE0102943A SE522746C2 (en) 2001-09-05 2001-09-05 Process for manufacturing an ultra-high tensile steel steel
PCT/SE2002/001577 WO2003020456A1 (en) 2001-09-05 2002-09-04 A method for manufacturing an ultra-high-tensile, expanded metal of steel

Publications (2)

Publication Number Publication Date
EP1423219A1 EP1423219A1 (en) 2004-06-02
EP1423219B1 true EP1423219B1 (en) 2008-10-08

Family

ID=20285232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02765741A Expired - Lifetime EP1423219B1 (en) 2001-09-05 2002-09-04 A method for manufacturing an ultra-high-tensile, expanded metal of steel

Country Status (6)

Country Link
EP (1) EP1423219B1 (en)
AT (1) ATE410250T1 (en)
DE (1) DE60229272D1 (en)
ES (1) ES2314095T3 (en)
SE (1) SE522746C2 (en)
WO (1) WO2003020456A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018085A (en) * 1934-05-29 1935-10-22 Allegheny Steel Co Method of making flat expanded grilles
US4649607A (en) * 1985-06-28 1987-03-17 Fmc Corporation Apparatus for making expanded metal

Also Published As

Publication number Publication date
WO2003020456A1 (en) 2003-03-13
ATE410250T1 (en) 2008-10-15
DE60229272D1 (en) 2008-11-20
SE0102943D0 (en) 2001-09-05
SE522746C2 (en) 2004-03-02
EP1423219A1 (en) 2004-06-02
ES2314095T3 (en) 2009-03-16
SE0102943L (en) 2003-03-06

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