EP1283277A1 - Acier possedant d'excellentes propriétés au formage par machine-outils, après un traitement thermique de durcissement, propriétés mécaniques excellentes et procédé de fabrication - Google Patents

Acier possedant d'excellentes propriétés au formage par machine-outils, après un traitement thermique de durcissement, propriétés mécaniques excellentes et procédé de fabrication Download PDF

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Publication number
EP1283277A1
EP1283277A1 EP02010286A EP02010286A EP1283277A1 EP 1283277 A1 EP1283277 A1 EP 1283277A1 EP 02010286 A EP02010286 A EP 02010286A EP 02010286 A EP02010286 A EP 02010286A EP 1283277 A1 EP1283277 A1 EP 1283277A1
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EP
European Patent Office
Prior art keywords
weight
steel
thermal treatment
molybdenum
manganese
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.)
Granted
Application number
EP02010286A
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German (de)
English (en)
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EP1283277B1 (fr
Inventor
Andrea Ghidini
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.)
LUCCHINI SIDERMECCANICA SpA
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LUCCHINI SIDERMECCANICA SpA
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Publication of EP1283277A1 publication Critical patent/EP1283277A1/fr
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • the present invention relates to a steel having excellent properties of workability by machine-tools and, after a hardening thermal treatment, excellent mechanical properties and almost non existent size variations and internal tensions, and process for the production thereof.
  • the present invention relates to a steel suitable for being used in the production of large size mold units for molding plastic materials, having, after a hardening thermal treatment, excellent mechanical characteristics, such that tensile strength (Rm) and ultimate yielding load (Rs) have a Rs/Rm ratio of about 0,9, ultimate tensile elongation, and necking down and contraction coefficient (Z); a Brinell hardness (HB) comprised between 340 and 450, and almost non existent size variations and internal tensions.
  • Rm tensile strength
  • Rs ultimate yielding load
  • Z necking down and contraction coefficient
  • HB Brinell hardness
  • the present invention also relates to the process for the production of said steel.
  • thermal re-treatment carried out on pre-worked artifacts is quite a risky operation, as it requires the carrying out of a hardening treatment at a temperature of about 850°C in oil-water, followed by a subsequent treatment of tempering, to obtain the surface hardness desired.
  • the tempering treatment involves different cooling gradients and therefore very high internal tensile stresses, due to changes in the phases of the material on different times.
  • Such internal stresses lead often to the break of the artifact, with remarkable economic and logistic damages due to the costs of the material, the mechanical works carried on and the subsequent thermal treatment which the artifact has been submitted to.
  • Object of the present invention is to obviate the above drawbacks.
  • object of the present invention is to provide a steel suitable for the production of large size molds, needing deep mechanical work excavation.
  • a further object of the present invention is to provide a steel suitable for the production of large size molds for molding plastic materials that need deep mechanical work excavations essentially free from internal tensile stresses.
  • Still another object of the present invention is to provide a steel suitable for the production of large size molds for molding plastic materials, having excellent mechanical features, a HB hardness suitable to be easily workable by machine tools and to be brought to its desired end form, and size variations and internal stresses almost non existent after the hardening thermal treatment.
  • the present invention allows to obtain these and still other objects that will be highlighted by the following description by means of a steel having a carbon content not higher than 0.25% by weight and a content of nickel an molybdenum higher that 2% by weight for each element.
  • At least a trace element selected from among manganese, silicon and chrome may be added.
  • object of the present invention is a steel having excellent mechanical properties and of workability on machine tools and size variations and internal tension almost non existent, after a thermal hardening treatment, containing an amount lower than 0,25% by weight of carbon; 2.5 to 4.5 % by weight of nickel; 2.5 to 4.5% of molybdenum; an amount lower than 0.25% by weight of vanadium, and amounts comprised between 0 and 1.1% by weight of at least one of the elements selected from manganese, silicon and chromium; the remaining up to 100 being iron, impurities excluded.
  • the steel of the present invention comprises: Carbon 0.05 to 0.25% by weight; Nickel 2.50 to 4.50 by weight; Molybdenum 2.50 to 4.50% by weight; Vanadium 0.05 to 0.25% by weight; Manganese 0.10 to 1.10% by weight; Silicon 0.10 to 1,10% by weight; Chrome 0.10 to 1.10% by weight; the remaining up to 100 being iron, impurities excluded.
  • the steel of the present invention comprises: Carbon 0.10 to 0.20% by weight; Nickel 2.50 to 3.50 by weight; Molybdenum 2.50 to 3.50% by weight; Vanadium 0.07 to 0.10 % by weight; Manganese 0.50 to 1.00% by weight; Silicon 0.20 to 0,30% by weight; Chrome 0.15 to 0.30% by weight; the remaining up to 100 being iron, impurities excluded.
  • the steel of the present invention is characterized by a hardening mechanism without phase transformation with an optimum calibration of properties, based on treatment temperature; an optimum workability of the solute and a good workability of the finished product; a greater total life cycle cost, and optimum polishing and photo-cutting characteristics.
  • the steel of the present invention having the above reported composition is first submitted to a melting treatment in order to remove possible structural alterations due to fabrication processes.
  • a melting treatment includes heating steel to temperatures comprised between 870 and 900°C, with a stay time at such temperatures necessary to melt possible constituents, preferably 2-4 hours, and subsequent quenching thereof.
  • the steel that is supplied either in the molten state or the state of forged mold blocks, after the melting treatment at a temperature comprised between 870 and 900°C, is submitted to a tempering thermal treatment, to attenuate the internal tensions caused by quenching and to bring Brinell hardness value to an interval comprised between 300 and 340 HB, so as to become easily workable with machine tools, and take on the final form desired.
  • a tempering thermal treatment is carried out by heating to about 400°C and subsequent staying at such temperature for 10-14 hours, followed by a spontaneous air cooling until the ambient temperature is reached.
  • the artifact is submitted to a thermal hardening treatment at temperatures comprised between 520 and 600°C and subsequent staying at such temperatures for a period of time comprised between 5 and 15 hours, followed by a spontaneous air cooling that increases both hardness and mechanical characteristics, ensuring high toughness and almost non existent size variations and internal tensions.
  • a steel was prepared having the following composition: Carbon 0.15 % by weight; Nickel 3% by weight; Molybdenum 3% by weight; Vanadium 0.08 % by weight; Manganese 0.70% by weight; Silicon 0,25 % by weight; Chrome 0.20% by weight; the remaining up to 100 being iron, impurities excluded.
  • the mold was hardened by treating it at 520-600°C for 10 hours, followed by a spontaneous cooling at ambient temperature.
  • the mod has the following characteristics depending on the treatment temperature: PROPERTY STANDARD UNIT VALUES Ultimate yielding load (Rs) UNI EN 10002 MPa 820-1200 Ultimate load (Rm) UNI EN 10002 MPa 1200-1400 Ultimate elongation (A) UNI EN 10002 % ⁇ 15 Necking down coefficient (Z) UNI EN 10002 % ⁇ 45 Brinell hardness (HB) UNI EN 10003 360-450 Rockwell hardness (HRC) UNI EN 10109 37-45 Charpy-V strength UNI EN 10045 Joule ⁇ 25 Dimensional variations: External sides 0.11% mean increase Internal sides 0.07 % mean increase Thickness 0.14% mean increase Height 0.16% mean increase Mold plane 0.11% mean increase Depth 0,2% mean side increase
  • the mold was molten again to bring it to the original Brinell hardness of 320 and an opening was obtained by milling that had a depth of 80 mm and a width of 34 mm, on each side, in correspondence of the smaller thickness part, as shown in the attached figure which shows a perspective view of the mold.
EP02010286A 2001-07-02 2002-05-21 Acier possedant d'excellentes propriétés au formage par machine-outils, après un traitement thermique de durcissement, propriétés mécaniques excellentes et procédé de fabrication Expired - Lifetime EP1283277B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20011402 2001-07-02
IT2001MI001402A ITMI20011402A1 (it) 2001-07-02 2001-07-02 Acciaio avente ottime proprieta' di lavorabilita' alle macchine utensili e dopo trattamento termico di indurimento ottime proprieta' meccani

Publications (2)

Publication Number Publication Date
EP1283277A1 true EP1283277A1 (fr) 2003-02-12
EP1283277B1 EP1283277B1 (fr) 2007-06-20

Family

ID=11447984

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EP02010286A Expired - Lifetime EP1283277B1 (fr) 2001-07-02 2002-05-21 Acier possedant d'excellentes propriétés au formage par machine-outils, après un traitement thermique de durcissement, propriétés mécaniques excellentes et procédé de fabrication

Country Status (6)

Country Link
EP (1) EP1283277B1 (fr)
AT (1) ATE365235T1 (fr)
DE (1) DE60220749T2 (fr)
ES (1) ES2289028T3 (fr)
IT (1) ITMI20011402A1 (fr)
PT (1) PT1283277E (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624687A (en) * 1949-01-03 1953-01-06 Bower Roller Bearing Co Process of heat-treating alloy steel
US2707680A (en) * 1952-08-29 1955-05-03 Heppenstall Co Alloy of iron, nickel, and molybdenum
GB753491A (en) * 1953-07-30 1956-07-25 Heppenstall Co Improvements in or relating to iron, nickel and molybdenum steel alloy and articles made therefrom
US3869318A (en) * 1972-05-26 1975-03-04 Stora Kopparbergs Bergslags Ab Mould for manufacturing plastic articles, and method of manufacturing the mould
US3912553A (en) * 1973-10-10 1975-10-14 Finkl & Sons Co Press forging die
US3954517A (en) * 1975-07-22 1976-05-04 The Timken Company Method for making carburized bearing members
JPH0250910A (ja) * 1988-08-15 1990-02-20 Nippon Steel Corp 熱疲労特性の良い金型鋼板の製造方法
EP0431557A1 (fr) * 1989-12-06 1991-06-12 Daido Tokushuko Kabushiki Kaisha Acier présentant une bonne soudabilité et utilisable comme moule de fabrication d'articles en matière plastique
EP0475804A1 (fr) * 1990-08-29 1992-03-18 Creusot-Loire Industrie Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé
JPH05345922A (ja) * 1992-06-11 1993-12-27 Japan Steel Works Ltd:The 高低圧一体型タービンロータの製造方法
US5645794A (en) * 1994-10-31 1997-07-08 Creusot Loire Inudstrie Low alloy steel for the manufacture of molds for plastics and for rubber
EP1036852A1 (fr) * 1999-02-12 2000-09-20 Hitachi Metals, Ltd. Acier à haute résistance mécanique pour estampes à usinabilité excellente

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624687A (en) * 1949-01-03 1953-01-06 Bower Roller Bearing Co Process of heat-treating alloy steel
US2707680A (en) * 1952-08-29 1955-05-03 Heppenstall Co Alloy of iron, nickel, and molybdenum
GB753491A (en) * 1953-07-30 1956-07-25 Heppenstall Co Improvements in or relating to iron, nickel and molybdenum steel alloy and articles made therefrom
US3869318A (en) * 1972-05-26 1975-03-04 Stora Kopparbergs Bergslags Ab Mould for manufacturing plastic articles, and method of manufacturing the mould
US3912553A (en) * 1973-10-10 1975-10-14 Finkl & Sons Co Press forging die
US3954517A (en) * 1975-07-22 1976-05-04 The Timken Company Method for making carburized bearing members
JPH0250910A (ja) * 1988-08-15 1990-02-20 Nippon Steel Corp 熱疲労特性の良い金型鋼板の製造方法
EP0431557A1 (fr) * 1989-12-06 1991-06-12 Daido Tokushuko Kabushiki Kaisha Acier présentant une bonne soudabilité et utilisable comme moule de fabrication d'articles en matière plastique
EP0475804A1 (fr) * 1990-08-29 1992-03-18 Creusot-Loire Industrie Procédé d'élaboration d'un acier à outils destiné notamment à la fabrication de moules et acier obtenu par ce procédé
JPH05345922A (ja) * 1992-06-11 1993-12-27 Japan Steel Works Ltd:The 高低圧一体型タービンロータの製造方法
US5645794A (en) * 1994-10-31 1997-07-08 Creusot Loire Inudstrie Low alloy steel for the manufacture of molds for plastics and for rubber
EP1036852A1 (fr) * 1999-02-12 2000-09-20 Hitachi Metals, Ltd. Acier à haute résistance mécanique pour estampes à usinabilité excellente

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 215 (C - 0716) 8 May 1990 (1990-05-08) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 191 (C - 1186) 4 April 1994 (1994-04-04) *

Also Published As

Publication number Publication date
ES2289028T3 (es) 2008-02-01
EP1283277B1 (fr) 2007-06-20
DE60220749D1 (de) 2007-08-02
PT1283277E (pt) 2007-09-27
ITMI20011402A1 (it) 2003-01-02
DE60220749T2 (de) 2008-03-06
ITMI20011402A0 (it) 2001-07-02
ATE365235T1 (de) 2007-07-15

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