EP0699774A2 - Acier pour bandes de roulement et bandage de roue ou roues monoblocs pour chemins de fer et similaire - Google Patents

Acier pour bandes de roulement et bandage de roue ou roues monoblocs pour chemins de fer et similaire Download PDF

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Publication number
EP0699774A2
EP0699774A2 EP95112050A EP95112050A EP0699774A2 EP 0699774 A2 EP0699774 A2 EP 0699774A2 EP 95112050 A EP95112050 A EP 95112050A EP 95112050 A EP95112050 A EP 95112050A EP 0699774 A2 EP0699774 A2 EP 0699774A2
Authority
EP
European Patent Office
Prior art keywords
steel
temperature
following
followed
hours
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
EP95112050A
Other languages
German (de)
English (en)
Other versions
EP0699774A3 (fr
EP0699774B1 (fr
Inventor
Giampiero Amici
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 RS SpA
Original Assignee
LOVERE SIDERMECCANICA SpA
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 LOVERE SIDERMECCANICA SpA filed Critical LOVERE SIDERMECCANICA SpA
Publication of EP0699774A2 publication Critical patent/EP0699774A2/fr
Publication of EP0699774A3 publication Critical patent/EP0699774A3/fr
Application granted granted Critical
Publication of EP0699774B1 publication Critical patent/EP0699774B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • 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
    • C21D2261/00—Machining or cutting being involved

Definitions

  • This invention relates to two types of steel, utilizable the one for the fabrication of tyre rims, the other one for the fabrication of monobloc tyres for railways, tramways and underground railways.
  • Object of this invention is to obviate the aforementioned drawbacks.
  • this invention allows to reach this object through the utilization, for the fabrication of rims for railway tyres and monobloc railway tyres, of two types of C-Mn-Mo steels in which small amounts of elements (oligoelements) have been added comprising B, Zr, Nb, V and Al.
  • oligoelements small amounts of elements
  • the contemporaneous presence of such oligoelements, in well defined ratios relatively to one another and to the other elements comprised in the steels allows to realize a synergetical activity which allows to obtain a good hardening, necessary to reach a remarkable hardness and wear resistance, higher than those of the traditional steels used at present for railway tyres, preserving at the same time toughness.
  • compositions of such C-Mn-Mo micro-alloyed steels are different only as concerns the C content, which is 0.51-0.53% in the first case and 0.43-0.45% in the second case.
  • compositions are shown in the following table, where, besides oligoelements, also all the other elements comprised are indicated, stressing for some of them the extreme minimum and maximum percent contents foreseen.
  • N grade steel undergoes a NORMALIZATION by heating at 870-900°C and following maintenance for 2-4 hours at such temperature, followed by spontaneous air cooling up to room temperature.
  • T grade steel undergoes instead HARDENING AND TEMPERING comprising:
  • the high temperature of the T grade ensures that high toughnesses are reached and reduces the problems of surface hardness decline during shoe braking.
  • the excellent hardening capacity of the material ensures also limited hardness declines in the section, promoting resistance to wear throughout the tyre rim life.
  • the treatment methods are so regulated as to guarantee a good homogeneity of the hardness of the rolling surface.
  • Said monobloc tyres undergo a differential hardening treatment in a suitable plant having known characteristics.
  • Such heat treatment comprises the following steps:
  • the tempering temperature of 500-540°C ensure, also in this case, that high toughnesses are reached and reduces the problems of surface hardness decline during shoe braking.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Metal Rolling (AREA)
EP95112050A 1994-08-09 1995-08-01 Acier pour roues monoblocs pour chemins de fer et similaire Expired - Lifetime EP0699774B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI941729A IT1274607B (it) 1994-08-09 1994-08-09 Acciai per cerchioni di ruote e per ruote monoblocco destinate al settore ferroviario e simili
ITMI941729 1994-08-09

Publications (3)

Publication Number Publication Date
EP0699774A2 true EP0699774A2 (fr) 1996-03-06
EP0699774A3 EP0699774A3 (fr) 1996-05-08
EP0699774B1 EP0699774B1 (fr) 1999-10-20

Family

ID=11369468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112050A Expired - Lifetime EP0699774B1 (fr) 1994-08-09 1995-08-01 Acier pour roues monoblocs pour chemins de fer et similaire

Country Status (5)

Country Link
EP (1) EP0699774B1 (fr)
AT (1) ATE185852T1 (fr)
DE (1) DE69512856T2 (fr)
ES (1) ES2137419T3 (fr)
IT (1) IT1274607B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2764127B1 (fr) 2011-10-07 2015-08-12 Babasaheb Neelkanth Kalyani Procédé permettant d'améliorer la résistance à la fatigue d'aciers en micro-alliage, pièces forgées réalisées selon le procédé et appareil permettant la mise en oeuvre du procédé
CN110791618A (zh) * 2019-11-11 2020-02-14 常熟非凡新材股份有限公司 球磨机衬板的加工方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512616A (ja) * 1974-06-25 1976-01-10 Nippon Steel Corp Chodaikajuyonetsushorireeru
US4348800A (en) * 1980-04-14 1982-09-14 Republic Steel Corporation Production of steel products with medium to high contents of carbon and manganese and superior surface quality
DE3446794C1 (de) * 1984-12-21 1986-01-02 BWG Butzbacher Weichenbau GmbH, 6308 Butzbach Verfahren zur Waermebehandlung perlitischer Schienenstaehle
JPH02133544A (ja) * 1988-11-14 1990-05-22 Nkk Corp 耐焼割れ性に優れたレール鋼
US4975041A (en) * 1989-05-18 1990-12-04 Fries Steven L Die assembly for die casting a propeller structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2764127B1 (fr) 2011-10-07 2015-08-12 Babasaheb Neelkanth Kalyani Procédé permettant d'améliorer la résistance à la fatigue d'aciers en micro-alliage, pièces forgées réalisées selon le procédé et appareil permettant la mise en oeuvre du procédé
CN110791618A (zh) * 2019-11-11 2020-02-14 常熟非凡新材股份有限公司 球磨机衬板的加工方法

Also Published As

Publication number Publication date
DE69512856D1 (de) 1999-11-25
EP0699774A3 (fr) 1996-05-08
ITMI941729A0 (it) 1994-08-09
EP0699774B1 (fr) 1999-10-20
ITMI941729A1 (it) 1996-02-09
ATE185852T1 (de) 1999-11-15
IT1274607B (it) 1997-07-18
ES2137419T3 (es) 1999-12-16
DE69512856T2 (de) 2000-02-24

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