EP1538231A1 - Mikrolegierter bainitischer Stahl mit hoher Ermüdungsfestigkeit - Google Patents

Mikrolegierter bainitischer Stahl mit hoher Ermüdungsfestigkeit Download PDF

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Publication number
EP1538231A1
EP1538231A1 EP04016413A EP04016413A EP1538231A1 EP 1538231 A1 EP1538231 A1 EP 1538231A1 EP 04016413 A EP04016413 A EP 04016413A EP 04016413 A EP04016413 A EP 04016413A EP 1538231 A1 EP1538231 A1 EP 1538231A1
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EP
European Patent Office
Prior art keywords
weight
quantities
comprised
temperature
fatigue
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
EP04016413A
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English (en)
French (fr)
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EP1538231B1 (de
Inventor
Stefano Cantini
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
LUCCHINI SIDERMECCANICA SpA
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Application filed by LUCCHINI SIDERMECCANICA SpA filed Critical LUCCHINI SIDERMECCANICA SpA
Priority to PL04016413T priority Critical patent/PL1538231T3/pl
Publication of EP1538231A1 publication Critical patent/EP1538231A1/de
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Publication of EP1538231B1 publication Critical patent/EP1538231B1/de
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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
    • C22C38/18—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
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite

Definitions

  • the present invention refers to a microalloy bainitic steel with high resistance to fatigue and to fretting fatigue.
  • the present invention refers to a microalloy bainitic steel with high resistance to fatigue and to fretting fatigue being particularly suitable to be used for the manufacturing of wheels for railway, tramway and/or metro fields.
  • the wheel is one of the most important components making the rolling stock.
  • the wheel is submitted to complex phenomena such as ratchetting, fretting fatigue wear friction, etc. intervening on the wheel/rail interface.
  • complex phenomena such as ratchetting, fretting fatigue wear friction, etc. intervening on the wheel/rail interface.
  • great stresses occur due to the severe load conditions. These stresses give rise both to the first stages of fretting fatigue failures and to wearing.
  • Fatigue failures are very dangerous as they can cause the detachment of small portions of wheel, with serious consequences both on suspensions, on the axle-box bearings of the vehicle and on the railway infrastructure.
  • fretting fatigue failures can be spallings due to ratchetting phenomena or to heat loads or spallings due to shellings or deep shellings.
  • spallings are induced by cold ratchetting. It is known that the wheel/rail contact develops in cyclic elastic-plastic conditions with localized ratchetting and the sum of ratchetting deriving from various cycles may give rise to local failures for damage accumulation.
  • spallings are due to the detachment of small portions of wheels with cratering forming on the rolling surface in conditions of high axle loads or in the presence of macrodefects at depths comprised between 6 and 30 mm under the rolling surface.
  • the object of the present invention is to remove the above-mentioned drawbacks.
  • the object of the present invention is to provide a steel suitable for the manufacturing of wheels for the railway, tramway and/or metro fields having a high resistance to fretting fatigue failures.
  • a further object of the present invention is to provide a steel suitable for the manufacturing of wheels for the railway, tramway and/or metro fields having high mechanical resistance and toughness features combined with high resistance features to wearing and fretting fatigue.
  • trace elements in well defined ratios among them and compared with the other steel elements helps the steel hardening and protects its toughness.
  • These trace elements with microalloying properties are Nb, Zr, Al and Ti in quantities not higher than 0.06% by weight and B, Ca and N in quantities not higher than 0.007% by weight.
  • the object of the present invention is a microalloy bainitic steel with high resistance to fatigue and to fretting fatigue containing:
  • the steel of the present invention preferably comprises: Carbon 0.15 - 0.35% by weight Silicon 0.60 - 1.20% by weight Manganese 0.60 - 1.50% by weight Chromium 0.10-1.00% by weight Nickel 0.10 - 1.00% by weight Molybdenum 0.10 - 0.90% by weight Vanadium 0.01 - 0.15% by weight Niobium 0.01 - 0.05% by weight Zirconium 0.005 - 0.06% by weight Aluminium 0.005 - 0.06% by weight Titanium 0.005 - 0.06% by weight Boron 0.0005 - 0.005% by weight Calcium 0.0002 - 0.005% by weight Nitrogen 0.003 - 0.007% by weight
  • the remaining part up to 100 being iron without impurities.
  • the product is submitted to austenitization and quenching in water.
  • This process consists in the heating at a temperature comprised between 850 and 950° C, a stay at this temperature for one hour for about each 40 mm of thickness of the processed product and in a quick cooling in water until room temperature is reached.
  • the product is then submitted to two thermal tempering processes in order to attenuate internal stresses caused by the abrupt cooling.
  • the first thermal tempering process is carried out by heating at a variable temperature comprised between 500 and 700°C according to the required features for a stay time at this temperature of about one hour for each 20 mm of thickness of the processed product, followed by a spontaneous air cooling until room temperature is reached.
  • the second thermal tempering process is carried out by heating at a temperature lower than 20°C compared to the one of the first thermal tempering process for a stay time at this temperature of about one hour for each 20 mm of thickness of the processed product followed by a spontaneous air cooling for at least 25 minutes and in any case being such to cool the rail wheel rolling until room temperature is reached.
  • the cooling of the rail wheel rolling can be carried out at a different speed from the one used for the cooling of the web in order to give different properties to each part of the wheel.
  • the steel of the present invention is characterized by an excellent balancing between tensile and toughness features. Toughness values are very high at any temperature level.
  • Some castings have been manufactured according to the following objective analysis: Carbon 0.27 - 0.32% by weight Silicon 0.60 - 0.80% by weight Manganese 0.90 - 1.10% by weight Chromium 0.20 - 0.50% by weight Nickel 0.20 - 0.50% by weight Molybdenum 0.20 - 0.50% by weight Vanadium 0.020 - 0.050% by weight Niobium 0.020 - 0.040% by weight Zirconium 0.015 - 0.045% by weight Aluminium 0.015 -0.055% by weight Titanium 0.010 - 0.040% by weight Boron 0.0010 - 0.040% by weight Calcium 0.002 - 0.003% by weight Nitrogen 0.003 - 0.004% by weight
  • the remaining part up to 100 being iron without impurities.
  • Each wheel has been submitted to austenitization and quenching by heating at a temperature of about 900°C for a stay time at this temperature of about 3 hours and a quick cooling in water until room temperature was reached.
  • Each wheel was then submitted to two subsequent thermal tempering processes the first of which was carried out by heating at a temperature of about 520°C - 600°C for a stay time at this temperature of about six hours and a spontaneous air cooling until room temperature was reached; the second one was carried out by heating at a temperature of 20°C lower than the one of the first process for a stay time at such temperature of about six hours and a spontaneous air cooling for 60 minutes until room temperature was reached.
  • the rail wheels thus obtained had the following average mechanical features: ROLLING SURFACE PROPERTIES STANDARD UNIT VALUE Monotonic yield UNI EN10002 Mpa 1,090 Tensile stress UNI EN10002 Mpa 1,210 Elongation at break UNI EN10002 % 16 Reduction coeff. UNI EN 10002 % 55 WEB PROPERTIES STANDARD UNIT VALUE Monotonic yield UNI EN10002 Mpa 1,090 Tensile stress UNI EN10002 Mpa 1,210 Elongation at break UNI EN10002 % 16 Reduction coeff. UNI EN10002 % 55

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
EP04016413A 2003-12-03 2004-07-13 Mikrolegierter bainitischer Stahl mit hoher Ermüdungsfestigkeit Expired - Lifetime EP1538231B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04016413T PL1538231T3 (pl) 2003-12-03 2004-07-13 Mikroskopowa stal bainityczna o wysokiej wytrzymałości na zmęczenie i zmęczenie cierno korozyjne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20032370 2003-12-03
IT002370A ITMI20032370A1 (it) 2003-12-03 2003-12-03 Acciaio microlegato bainitico ad elevata resistenza a fatica

Publications (2)

Publication Number Publication Date
EP1538231A1 true EP1538231A1 (de) 2005-06-08
EP1538231B1 EP1538231B1 (de) 2010-08-25

Family

ID=34452266

Family Applications (1)

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EP04016413A Expired - Lifetime EP1538231B1 (de) 2003-12-03 2004-07-13 Mikrolegierter bainitischer Stahl mit hoher Ermüdungsfestigkeit

Country Status (6)

Country Link
EP (1) EP1538231B1 (de)
AT (1) ATE478970T1 (de)
DE (1) DE602004028791D1 (de)
ES (1) ES2350204T3 (de)
IT (1) ITMI20032370A1 (de)
PL (1) PL1538231T3 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100374606C (zh) * 2005-07-30 2008-03-12 马鞍山钢铁股份有限公司 一种轻型高速列车车轮用中碳低合金钢
WO2008154680A1 (en) * 2007-06-19 2008-12-24 Qr Limited Treatment of railway wheels
DE112008001181B4 (de) * 2007-05-16 2012-01-12 Benteler Deutschland Gmbh Verwendung einer Stahllegierung für Achsrohre sowie Achsrohr
CN104975229A (zh) * 2015-06-15 2015-10-14 柳州金特新型耐磨材料股份有限公司 一种齿套
EP3483298A4 (de) * 2016-07-06 2019-07-24 Magang (Group) Holding Co., Ltd. Bainitisches stahlrad mit hoher zähigkeit für den schienenverkehr und herstellungsverfahren dafür
EP3460089A4 (de) * 2016-07-06 2019-07-24 Magang (Group) Holding Co., Ltd. Rad für schienenverkehr aus bainitischem stahl mit kostengünstiger, schlanker fertigung und herstellungsverfahren dafür
WO2019229693A1 (en) * 2018-05-30 2019-12-05 Rail 1520 Ip Ltd Alloyed cast stell and article made therefrom
CN113186446A (zh) * 2021-04-02 2021-07-30 甘肃酒钢集团宏兴钢铁股份有限公司 一种控制微合金化中厚板珠光体形态及碳氮化合物析出的工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104325838B (zh) * 2014-10-22 2016-08-24 雷帮荣 一种高铁车轮及其热挤压整体成型方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2166585A5 (en) * 1971-12-30 1973-08-17 Creusot Loire Steel alloy - for use in pressurised hydrogen or during hydrogen production
GB1417330A (en) * 1972-03-02 1975-12-10 Italsider Spa Method for manufacturing steel monobloc wheels
US5518685A (en) * 1994-02-03 1996-05-21 Mitsubishi Steel Mfg. Co., Ltd. Steel for carburized gear
US5533770A (en) * 1992-10-10 1996-07-09 Man Gutehoffnungshutte Aktiengesellschaft High-strength solid wheels and tires for railroad traction vehicles and cars
EP0884396A1 (de) * 1997-05-23 1998-12-16 Valdunes Verfahren zur Herstellung eines Eisenbahnrades und so hergestelltes Eisenbahnrad
EP1241277A2 (de) * 2001-03-05 2002-09-18 AMSTED Industries Incorporated Eisenbahnradlegierung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2166585A5 (en) * 1971-12-30 1973-08-17 Creusot Loire Steel alloy - for use in pressurised hydrogen or during hydrogen production
GB1417330A (en) * 1972-03-02 1975-12-10 Italsider Spa Method for manufacturing steel monobloc wheels
US5533770A (en) * 1992-10-10 1996-07-09 Man Gutehoffnungshutte Aktiengesellschaft High-strength solid wheels and tires for railroad traction vehicles and cars
US5518685A (en) * 1994-02-03 1996-05-21 Mitsubishi Steel Mfg. Co., Ltd. Steel for carburized gear
EP0884396A1 (de) * 1997-05-23 1998-12-16 Valdunes Verfahren zur Herstellung eines Eisenbahnrades und so hergestelltes Eisenbahnrad
EP1241277A2 (de) * 2001-03-05 2002-09-18 AMSTED Industries Incorporated Eisenbahnradlegierung

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100374606C (zh) * 2005-07-30 2008-03-12 马鞍山钢铁股份有限公司 一种轻型高速列车车轮用中碳低合金钢
DE112008001181B4 (de) * 2007-05-16 2012-01-12 Benteler Deutschland Gmbh Verwendung einer Stahllegierung für Achsrohre sowie Achsrohr
WO2008154680A1 (en) * 2007-06-19 2008-12-24 Qr Limited Treatment of railway wheels
CN101821414B (zh) * 2007-06-19 2013-07-17 昆士兰铁路有限公司 铁路车轮的处理
AU2008265498B2 (en) * 2007-06-19 2013-10-31 Asciano Services Pty Ltd Treatment of railway wheels
CN104975229A (zh) * 2015-06-15 2015-10-14 柳州金特新型耐磨材料股份有限公司 一种齿套
EP3483298A4 (de) * 2016-07-06 2019-07-24 Magang (Group) Holding Co., Ltd. Bainitisches stahlrad mit hoher zähigkeit für den schienenverkehr und herstellungsverfahren dafür
EP3460089A4 (de) * 2016-07-06 2019-07-24 Magang (Group) Holding Co., Ltd. Rad für schienenverkehr aus bainitischem stahl mit kostengünstiger, schlanker fertigung und herstellungsverfahren dafür
WO2019229693A1 (en) * 2018-05-30 2019-12-05 Rail 1520 Ip Ltd Alloyed cast stell and article made therefrom
CN113186446A (zh) * 2021-04-02 2021-07-30 甘肃酒钢集团宏兴钢铁股份有限公司 一种控制微合金化中厚板珠光体形态及碳氮化合物析出的工艺

Also Published As

Publication number Publication date
ITMI20032370A1 (it) 2005-06-04
DE602004028791D1 (de) 2010-10-07
ES2350204T3 (es) 2011-01-20
EP1538231B1 (de) 2010-08-25
ATE478970T1 (de) 2010-09-15
PL1538231T3 (pl) 2011-02-28

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