EP1248862B1 - Proc d de bainitation d' l ments en acier - Google Patents

Proc d de bainitation d' l ments en acier Download PDF

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Publication number
EP1248862B1
EP1248862B1 EP00984836A EP00984836A EP1248862B1 EP 1248862 B1 EP1248862 B1 EP 1248862B1 EP 00984836 A EP00984836 A EP 00984836A EP 00984836 A EP00984836 A EP 00984836A EP 1248862 B1 EP1248862 B1 EP 1248862B1
Authority
EP
European Patent Office
Prior art keywords
steel parts
temperature
process according
iso
period
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.)
Revoked
Application number
EP00984836A
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German (de)
English (en)
Other versions
EP1248862A1 (fr
Inventor
Lothar Foerster
Michael Michalski
Andreas Becht
Karl-Otto Englert
Michael Czeringer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1248862A1 publication Critical patent/EP1248862A1/fr
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    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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 invention relates to a method for bainitizing Steel parts according to the preamble of the main claim.
  • bainitizing is meant a heat treatment of Steel, which is first an “austenitizing” of steel, a subsequent quenching to a temperature above the so-called “martensite” start temperature and holding the Steel at this temperature for a given time includes.
  • the austenitizing of steel, a subsequent Deterrence and the isothermal conversion of austenite in bainite above the martensite start temperature is further for example, also from US 5,628,045; EP-A-0 707 088 and EP-A-0 896 068.
  • the inventive method for bainitizing steel parts as claimed in claim 1 over the prior art has the advantage that thus an at least almost complete conversion of Austenite in bainite, i. a purely bainitic structure, achievable, while the hardness of the afterwards obtained steel parts in a simple manner by the Process parameters is controllable.
  • the obtained steel parts improved strength properties, for example with regard to a pulsating pressure-threshold load, on.
  • a further advantage is that the inventive Process in a simple manner in mass production can be used without significant interference with existing Production processes or investments in production facilities would be required.
  • the inventive method is further advantageous quenching of series batches of steel parts at low salt bath temperatures while producing as pure as possible bainite, ie without proportion of continuous bainite, possible, in addition, a uniform quenching intensity is achieved within a batch.
  • the start temperature T 2 which is preferably slightly above the martensite start temperature T M , that in the ZTU image during quenching the pearlite microstructure is passed through.
  • the core hardness of the implementation by the process according to the invention obtained steel parts the duration of the first period, i. of holding in the first salt bath or oil bath, and also the temperature of the first salt bath can be adjusted. It applies in general, that the core hardness of the obtained bainitic The shorter the structure of the steel parts Residence time in the first salt bath is selected.
  • the resulting heat of reaction can be used to advantage, the steel parts after completion of the first period of a start temperature T 2 to a finish temperature T 3 on which the steel parts are then held for the duration of the second period. This results in an energy saving and a quick and uniform heating of the steel parts.
  • the figure shows a schematic diagram of a so-called “ZTU image” (Time-Temperature Conversion Chart) the Conversion of austenite into bainite by means of a graded Bainite.
  • ZTU image Time-Temperature Conversion Chart
  • the invention is exemplified by the bainitization of steel Type 100Cr6, material no. 1.3505, explained.
  • steel parts of this type are first austenitized in a conventional manner and then starting from a quenching temperature T 1 of 830 ° C to 870 ° C, for example 850 ° C, in a conventional manner in a first salt bath to a starting temperature T 2 quenched, which is above the martensite start temperature T M of the steel parts.
  • the martensite start temperature T M is in the illustrated example at about 205 ° C to 215 ° C.
  • the perlite structure area is also further 11 registered, in the inventive Bainitization by graded thermal conversion is not is going through.
  • This second, isothermal storage at the finish temperature T 3 lasts for a second period ⁇ t iso, 2 , which is completed as soon as the bainite microstructure 12 is reached at the time t 3 , ie as soon as at least almost complete conversion of austenite into pure bainite is done.
  • the period .DELTA.t iso, 2 or the time and t 3 may be different, selected from the illustration in the figure, for example for reasons of process stability such or extended, that the coordinate (T 3, T 3 ) lies within the bainite structure region 12.
  • the achievement of the limitation of the bainite structure region 12 in the figure during the second period .DELTA.t iso, 2 is thus only to be understood as a minimum requirement for the length of the second time period .DELTA.t iso, 2 .
  • the second, isothermal storage of the steel parts at the finish temperature T 3 takes place in a second salt bath or oil bath or alternatively also in a holding furnace according to the recirculation principle.
  • the steel parts are then stored isothermally in the first salt bath over the first period .DELTA.t iso, 1 , which lasts for 5 minutes to 30 minutes, preferably 20 minutes.
  • the steel parts are converted into a holding furnace according to the circulating air principle, which has a finish temperature T 3 of 240 ° C. to 280 ° C., in particular 260 ° C.
  • the steel parts are then stored at this finish temperature T 3 over the second period ⁇ t iso, 2 , which lasts between 200 min and 400 min, preferably 250 min to 270 min.
  • a second salt bath with the finishing temperature T 3 can also be used.
  • a preferred embodiment of the method according to the invention further provides that the heat of reaction formed in the formation of the bainite microstructure is at least partially used for heating the steel parts from the start temperature T 2 to the finish temperature T 3 or for heating the holding furnace.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (9)

  1. Procédé de bainitation d'éléments en acier présentant les étapes suivantes : a) austénitisation des éléments en acier, b) refroidissement des éléments à une température de départ (T2) supérieure à la température de départ de martensite (TM) des éléments d'acier, c) séjour à peu près isotherme des éléments d'acier à la température de départ (T2) pendant un premier intervalle de temps (Δtiso,1) qui dure de 5 à 30 minutes, et d) séjour à peu près isotherme des éléments d'acier dans un four de maintien à circulation d'air, dans un bain de sel chaud, ou dans un bain d'huile à une température de finition (T3) supérieure à la température de départ (T2), pendant un second intervalle de temps (Δtiso,2).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la structure austénitique des éléments en acier est transformée au moins largement en une structure notamment purement bainitique.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    la température de départ (T2) utilisée est de 215° C à 230° C.
  4. Procédé selon la revendication 1,
    caractérisé en ce que
    la température de finition (T3) utilisée est de 240° C à 280° C.
  5. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce que
    le refroidissement à l'étape de procédé (b) et/ou le séjour à l'étape de procédé (c) a/ont lieu dans un premier bain de sel chaud ou dans un bain d'huile.
  6. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce que
    l'intervalle de temps (Δtiso,2) va de 200 à 400 minutes, notamment de 250 à 300 minutes.
  7. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce qu'
    après l'étape de procédé (d) a lieu un refroidissement des éléments en acier à une température (T4) allant de 20° C à 40° C.
  8. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce que
    la trempe à coeur des éléments en acier est réglée par la durée du premier et/ou du second intervalle de temps (Δtiso,1, Δtiso,2) et/ou par la température de départ (T2) et/ou par la température de finition (T3).
  9. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce que
    la chaleur de réaction produite lors de la formation de la structure bainitique est utilisée au moins en partie pour chauffer les éléments en acier, en particulier pendant l'étape de procédé (d) réalisée dans un four.
EP00984836A 1999-12-31 2000-10-18 Proc d de bainitation d' l ments en acier Revoked EP1248862B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19963973A DE19963973C1 (de) 1999-12-31 1999-12-31 Verfahren zum Bainitisieren von Stahlteilen
DE19963973 1999-12-31
PCT/DE2000/003668 WO2001049888A1 (fr) 1999-12-31 2000-10-18 Procédé de bainitation d'éléments en acier

Publications (2)

Publication Number Publication Date
EP1248862A1 EP1248862A1 (fr) 2002-10-16
EP1248862B1 true EP1248862B1 (fr) 2005-05-18

Family

ID=7935123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00984836A Revoked EP1248862B1 (fr) 1999-12-31 2000-10-18 Proc d de bainitation d' l ments en acier

Country Status (6)

Country Link
US (1) US6843867B1 (fr)
EP (1) EP1248862B1 (fr)
JP (1) JP5231700B2 (fr)
AT (1) ATE295901T1 (fr)
DE (2) DE19963973C1 (fr)
WO (1) WO2001049888A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004038159B3 (de) * 2004-08-06 2006-05-18 Ab Skf Verfahren zur Wärmebehandlung von Werkstücken aus Stahl oder Gusseisen
DE102007061084A1 (de) 2007-12-19 2009-07-02 Federal-Mogul Sealing Systems Gmbh Metallische Flachdichtung und Herstellverfahren
US8066828B2 (en) * 2008-06-18 2011-11-29 Tata Consultancy Services, Ltd. Method for efficient heat treatment of steel
JP2014516120A (ja) * 2011-05-25 2014-07-07 アクティエボラゲット・エスコーエッフ 鋼構成部品の熱処理方法
EP2982769A1 (fr) 2014-08-06 2016-02-10 Indexator Group AB Acier, procédé pour sa fabrication et composant
DE102015218163A1 (de) 2015-09-22 2017-03-23 Robert Bosch Gmbh Bainitisiertes Bauteil und Verfahren zur Herstellung
US10822180B2 (en) 2018-08-01 2020-11-03 iwis drive systems, LLC Chain for grain elevators
SE542672C2 (en) 2018-09-14 2020-06-23 Ausferritic Ab Method for producing an ausferritic steel austempered during continuous cooling followed by annealing
US11713492B2 (en) 2019-06-25 2023-08-01 iwis drive systems, LLC Offset link for roller chain with enhanced strength
DE102021130969A1 (de) 2021-11-25 2023-05-25 Ald Vacuum Technologies Gmbh Verfahren und System zum Bainitisieren metallischer Werkstücke

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2258566A (en) * 1940-07-30 1941-10-07 American Steel & Wire Co Hardenable steel heat treatment
DE2939380A1 (de) * 1979-09-28 1981-04-16 Aichelin GmbH, 7015 Korntal Zwischenstufenverguetungsanlage
JPH02277715A (ja) * 1989-04-19 1990-11-14 Aisin Takaoka Ltd 片状黒鉛鋳鉄の熱処理法
JP2984889B2 (ja) * 1992-07-08 1999-11-29 新日本製鐵株式会社 伸線加工性に優れた高炭素鋼線材または鋼線およびその製造方法
DE69427473T2 (de) * 1993-05-25 2002-04-18 Nippon Steel Corp., Tokio/Tokyo Hochkohlenstoffhaltige stahlstange oder -draht mit hervorragender ziehbarkeit und verfahren zu deren herstellung
DE19521941C1 (de) * 1995-06-07 1996-10-02 Mannesmann Ag Verfahren und Vorrichtung zur Herstellung von Sinterteilen
JP3580938B2 (ja) * 1996-03-05 2004-10-27 アイシン・エィ・ダブリュ株式会社 昇温ベイナイト処理法
SE510344C2 (sv) 1997-08-01 1999-05-17 Ovako Steel Ab Sätt för fullständig bainithärdning av stål

Also Published As

Publication number Publication date
JP5231700B2 (ja) 2013-07-10
WO2001049888A1 (fr) 2001-07-12
US6843867B1 (en) 2005-01-18
DE50010362D1 (de) 2005-06-23
DE19963973C1 (de) 2001-05-31
ATE295901T1 (de) 2005-06-15
WO2001049888A9 (fr) 2003-06-05
EP1248862A1 (fr) 2002-10-16
JP2004510048A (ja) 2004-04-02

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