EP0475804B1 - Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé - Google Patents

Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé Download PDF

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Publication number
EP0475804B1
EP0475804B1 EP91402233A EP91402233A EP0475804B1 EP 0475804 B1 EP0475804 B1 EP 0475804B1 EP 91402233 A EP91402233 A EP 91402233A EP 91402233 A EP91402233 A EP 91402233A EP 0475804 B1 EP0475804 B1 EP 0475804B1
Authority
EP
European Patent Office
Prior art keywords
steel
less
manufacture
solidification
sulfur
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
EP91402233A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0475804A1 (fr
Inventor
Gilbert Primon
Jean Beguinot
Lucien Cadiou
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.)
Creusot Loire SA
Creusot Loire Industrie SA
Original Assignee
Creusot Loire SA
Creusot Loire Industrie SA
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 Creusot Loire SA, Creusot Loire Industrie SA filed Critical Creusot Loire SA
Publication of EP0475804A1 publication Critical patent/EP0475804A1/fr
Application granted granted Critical
Publication of EP0475804B1 publication Critical patent/EP0475804B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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

Definitions

  • the present invention relates to a process for producing a tool steel intended in particular for the manufacture of injection molds, as well as a tool steel obtained by this process.
  • the steels intended for the manufacture of molds must necessarily reconcile, on the one hand, an excellent aptitude for severe machining and, on the other hand, an aptitude for finishing treatments of the mold cavity surfaces, both from the point mechanically, for example in a polishing operation, than chemically, for example in a peening operation.
  • the physical and / or chemical behavior of these steels can be contradictory, which requires optimizing their various characteristics in order to reach a satisfactory compromise.
  • Tool steels are known for making molds, containing a sulfur content in a range of 0 to 0.1% by weight, a relatively wide content range for steels used in this technical field.
  • these steels Due to the amplitude of the range of the sulfur content, these steels have the drawback of not having simultaneously the above characteristics and, moreover, for certain sulfur contents, the characteristics of said steels are not not suitable, in particular for polishing and / or roughening.
  • a heterogeneous distribution of sulphides may occur, by a phenomenon of localized segregation, which takes place during the insufficiently controlled solidification of the steel in the mold.
  • the object of the invention is to alleviate these various drawbacks, inter alia, by proposing improved quality tool steel, in particular for the manufacture of molds.
  • the invention also relates to a tool steel intended in particular for the manufacture of injection molds, obtained by the method, as well as the use of such steel for the manufacture of injection molds.
  • the single figure is a curve showing the density of micro-pits with an average diameter of less than 25 ⁇ m, after a polishing operation, as a function of the sulfur content entering the composition of steel.
  • a tool steel is produced intended for the manufacture of molds by controlling a deoxidation operation during which the elements of composition are in the molten state under vacuum at a pressure of less than 1.3 ⁇ 10 3 Pa ( 10 mm Hg).
  • the deoxidation operation consists of stirring the steel in the presence of calcium.
  • Calcium can be replaced by other deoxidizing elements, such as for example silicon, aluminum, zirconium, titanium at contents lower than 0.35%.
  • Another operation according to the method consists in resulfurization of the molten steel under a controlled atmosphere of a neutral gas, such as argon.
  • a neutral gas such as argon.
  • the controlled atmosphere of argon can be replaced by a controlled atmosphere of nitrogen, helium.
  • a third operation according to the method comprises a casting of the steel under conditions which ensure a gradual and regular solidification avoiding local delays in solidification and segregation effects of sulphides.
  • the elements chosen from selenium, tellurium, boron, cerium, introduced into the composition of steel as a single element or in combination have as their effect of reinforcing the effect of sulfur on the machinability without appreciably harming the other characteristics of steel.
  • the homogenization of sulfur in a defined proportion in the steel is improved by the solidification of the steel in an ingot mold ensuring a low tendency to meso-segregation and this by controlling a regular advance of the solidification front.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP91402233A 1990-08-29 1991-08-12 Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé Expired - Lifetime EP0475804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9010780 1990-08-29
FR9010780A FR2666351B1 (fr) 1990-08-29 1990-08-29 Procede d'elaboration d'un acier a outils destine notamment a la fabrication de moules et acier obtenu par ce procede.

Publications (2)

Publication Number Publication Date
EP0475804A1 EP0475804A1 (fr) 1992-03-18
EP0475804B1 true EP0475804B1 (fr) 1996-01-03

Family

ID=9399939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402233A Expired - Lifetime EP0475804B1 (fr) 1990-08-29 1991-08-12 Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé

Country Status (6)

Country Link
EP (1) EP0475804B1 (it)
BE (1) BE1006831A5 (it)
DE (1) DE69116042T2 (it)
ES (1) ES2034892B1 (it)
FR (1) FR2666351B1 (it)
IT (1) IT1250001B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104498842A (zh) * 2014-12-29 2015-04-08 芜湖金龙模具锻造有限责任公司 一种硼锑合金轧辊材料

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531260C5 (de) * 1995-08-25 2006-06-22 Edelstahlwerke Buderus Ag Verfahren zur Herstellung eines Warmarbeitsstahls
FR2823768B1 (fr) * 2001-04-18 2003-09-05 Usinor Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues
ITMI20011402A1 (it) * 2001-07-02 2003-01-02 Lucchini S P A Acciaio avente ottime proprieta' di lavorabilita' alle macchine utensili e dopo trattamento termico di indurimento ottime proprieta' meccani

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290128A (en) * 1966-02-21 1966-12-06 United States Steel Corp Steel weldments
JPS5323764B1 (it) * 1971-06-21 1978-07-17
SE363351B (it) * 1972-05-26 1974-01-14 Stora Kopparbergs Bergslags Ab
US4012227A (en) * 1975-06-19 1977-03-15 The International Nickel Company, Inc. Highly castable, weldable, corrosion resistant stainless steel
AT390806B (de) * 1983-09-23 1990-07-10 Kos Bernd Austenitischer manganhartstahl und verfahren zu seiner herstellung
US4673433A (en) * 1986-05-28 1987-06-16 Uddeholm Tooling Aktiebolag Low-alloy steel material, die blocks and other heavy forgings made thereof and a method to manufacture the material
US4711677A (en) * 1986-07-18 1987-12-08 The Garrett Corporation High temperature bushing alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IRON AND STEEL vol.3, no.SP.I., Guildford GB, pages 27-43; R.W.Reynoldson et al: "The vacuumheat treatment of tool steels" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104498842A (zh) * 2014-12-29 2015-04-08 芜湖金龙模具锻造有限责任公司 一种硼锑合金轧辊材料

Also Published As

Publication number Publication date
ES2034892B1 (es) 1994-04-01
FR2666351A1 (fr) 1992-03-06
IT1250001B (it) 1995-03-30
FR2666351B1 (fr) 1993-11-12
ES2034892A1 (es) 1993-04-01
ITTO910663A0 (it) 1991-08-27
DE69116042T2 (de) 1996-05-15
DE69116042D1 (de) 1996-02-15
BE1006831A5 (fr) 1995-01-03
ITTO910663A1 (it) 1993-02-27
EP0475804A1 (fr) 1992-03-18

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