EP0717116B1 - Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück - Google Patents

Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück Download PDF

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Publication number
EP0717116B1
EP0717116B1 EP95402754A EP95402754A EP0717116B1 EP 0717116 B1 EP0717116 B1 EP 0717116B1 EP 95402754 A EP95402754 A EP 95402754A EP 95402754 A EP95402754 A EP 95402754A EP 0717116 B1 EP0717116 B1 EP 0717116B1
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EP
European Patent Office
Prior art keywords
heating
treatment
work piece
steel
blank
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
EP95402754A
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English (en)
French (fr)
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EP0717116A1 (de
Inventor
Jacques Bellus
Claude Pichard
Pierre Jolly
Daniel Forest
Daniel Robat
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Ascometal SA
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Ascometal SA
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Publication of EP0717116A1 publication Critical patent/EP0717116A1/de
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or 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
    • C21D1/06—Surface 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 thermomechanical treatments of rooms with high characteristics of microalloyed steel, such as forging, welding and treatments surface heat.
  • Microalloyed steels having the composition 0.05% ⁇ C ⁇ 0.5%; 1% ⁇ Mn ⁇ 2%; 0.05% ⁇ If ⁇ 1.5%; 0.1% ⁇ Cr ⁇ 1%; 0% ⁇ Mo ⁇ 0.5%; 0 ⁇ V ⁇ 0.30%; 0 ⁇ B ⁇ 0.010%; 0 ⁇ Ti ⁇ 0.030%, 0 ⁇ Nb ⁇ 0.1, the rest being iron, unavoidable impurities resulting from the development, are used in particular for manufacture forgings with high characteristics. These pieces should, for example, have a breaking strength between 900 and 1200 MPa and a good shock resistance.
  • This type of metallurgy is well suited to forging and other treatments which are practiced at high temperatures (above 1000 ° C for example), to which the austenitization of the part is complete.
  • this metallurgy poses problem when the part is subjected locally or entirely to temperatures of lower heating, between 500 and 900 ° C. This is particularly the case when the forging treatment aims to shape only one end of a steel bar, and where the heating action is therefore limited to this end.
  • the region of the bar which is not not directly heated but near the area to be forged is, in fact, brought to a lower temperature, but high enough to impose transformations metallurgical to this region.
  • a similar phenomenon occurs when the part undergoes welding, nitriding treatment or surface heat treatment, such as than laser quenching, or induction quenching: the subsurface layers of the piece are affected by treatment in a way that may be undesirable.
  • the problem is that the portions of these parts that have undergone such reheating between 500 and 900 ° C have a softening detrimental to the good mechanical strength of the part, especially its fatigue behavior.
  • An explanation of this phenomenon softening is that for these relatively low heating temperatures, the hardening effect of interphase precipitation is eliminated, and the hardenability is greatly reduced due to the very small grain size. The result is that the room therefore no longer has in its entire volume properties that are both high and homogeneous.
  • the object of the invention is to propose a method of manufacturing parts made of microalloyed steel with high mechanical characteristics allowing to overcome this softening problem, whatever the local heating conditions of the parts in question.
  • DE-A-1 225 217 or US-A-5 041 167 describe methods for manufacturing parts made of microalloyed steel in a bainitic structure subjected to nitriding or forging treatments.
  • the invention relates to a process for manufacturing a piece of mechanical steel, whereby a steel blank is submitted microalloy comprising, in weight percentages, 0.05% ⁇ C ⁇ 0.5%; 1% ⁇ Mn ⁇ 2%; 0.05% ⁇ Si ⁇ 1.5%; 0.1% ⁇ Cr ⁇ 1%; 0% ⁇ Mo ⁇ 0.5%; 0 ⁇ V ⁇ 0.30%, 0 ⁇ B ⁇ 0.010%; 0 ⁇ Ti ⁇ 0.030%, 0 ⁇ Nb ⁇ 0.1%, to treatment thermal or thermomechanical, as defined in claim 1.
  • the invention also relates to a structural steel part. mechanical manufactured by this process.
  • the invention consists in starting from a steel blank of microalloyed mechanical construction having a bainitic structure to produce a room to which heating is to be applied which, whether undergoing or desired, will at least locally its temperature between 500 and 900 ° C. Starting from such a draft which has both the specified composition and a bainitic structure, one does not obtain not, for the portions of the blank thus heated, the undesirable softening which one observes when the blank has a ferrito-pearlitic structure.
  • the conditions for cooling the bar in the hot rolling led, as is known, to the establishment of a structure ferrito-pearlitic.
  • an induction heating is carried out central part 2, for example with a view to subsequent forging.
  • a homogeneous temperature of about 1200 ° C.
  • this central part 2 which is directly influenced by the heating means, there is a decrease in the temperature of room 1 as one moves away from the central part 2, up to a temperature close to the ambient temperature of 20 ° C.
  • portions 3, 3 ′ of part 1 a temperature between the temperatures conventionally known as Ac3 and Ac1 of the shade constituting bar 1.
  • these temperatures are respectively 790 and 740 ° C.
  • the portions 3, 3 'concerned each extend over a length of approximately 30 mm. This evolution of the temperature along the bar 1 is translated by the curve 4 of the figure unique.
  • the heating action which, according to the invention, we want to prevent from leading localized or generalized softening of the part structure, may be various natures and exercised for different purposes.
  • the invention can also concern surface heat treatments such as laser quenching, induction quenching, electron beam bombardment and treatments of nitriding. Heating can also be a consequence of a welding operation.
  • the cooling of the part must be done at a speed not too weak, i.e. at least 500 ° C / hour, so as to preserve the structure bainitique previously obtained, in order to avoid possible softening.
  • the invention makes it possible to widen the range of shades which can be used for the manufacture of high-quality mechanical steel parts and homogeneous. It avoids having to resort to subsequent heat treatments to restore the mechanical properties which would have been affected by a softening of the structure as described, which saves time for manufacturing the part and for its manufacturing cost.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
  • Coating With Molten Metal (AREA)
  • Gears, Cams (AREA)
  • Golf Clubs (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)

Claims (9)

  1. Verfahren zur Herstellung eines Stückes aus Maschinenbaustahl, wobei man einen Rohling aus Mikrolegierstahl, der in Gew.%:
    0,05% ≤ C ≤ 0,5%; 1% ≤ Mn ≤ 2%; 0,05% ≤ Si ≤ 1,5%;
    0,1% ≤ Cr ≤ 1%; 0% ≤ Mo ≤ 0,5%; 0 ≤ V ≤ 0,30%;
    0 ≤ B ≤ 0,010%; 0 ≤ Ti ≤ 0,030%; 0 ≤ Nb ≤ 0,1%
    enthält; wobei der Rest Eisen sowie unvermeidbare Verunreinigungen umfasst und der Rohling eine Bainitstruktur aufweist, einer thermischen oder thermomechanischen Behandlung unterwirft, umfassend einen Erhitzungsschritt, bei dem nur ein Teil des Rohlings einer Temperatur von 500 bis 900°C ausgesetzt wird, dadurch gekennzeichnet, dass nach dem Erhitzen ein Schritt zur Abkühlung des Teils mit einer Geschwindigkeit von größer als 500°C/Stunde erfolgt, um die Bainitstruktur zu erhalten und eine eventuelle Erweichung in mindestens einem Teil des Stückes, außerhalb des Teils des Stückes, das direkt dem Heizgerät ausgesetzt ist, zu vermeiden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Erhitzen im Hinblick auf eine Warmumformung durchgeführt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Erhitzen bei einer Nitrierhärtung durchgeführt wird.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Erhitzen eine thermische Oberflächenbehandlung ist.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die thermische Behandlung eine Laserhärtung ist.
  6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die thermische Behandlung eine Induktionshärtung ist.
  7. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die thermische Behandlung ein Elektronenstrahlbeschuss ist.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Erhitzen ein Schweißverfahren ist.
  9. Stück aus Maschinenbaustahl, dadurch gekennzeichnet, dass es durch das Verfahren nach einem der Ansprüche 1 bis 8 hergestellt wird.
EP95402754A 1994-12-13 1995-12-07 Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück Expired - Lifetime EP0717116B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414941A FR2727981B1 (fr) 1994-12-13 1994-12-13 Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee
FR9414941 1994-12-13

Publications (2)

Publication Number Publication Date
EP0717116A1 EP0717116A1 (de) 1996-06-19
EP0717116B1 true EP0717116B1 (de) 2001-06-13

Family

ID=9469719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402754A Expired - Lifetime EP0717116B1 (de) 1994-12-13 1995-12-07 Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück

Country Status (11)

Country Link
US (1) US5667605A (de)
EP (1) EP0717116B1 (de)
AT (1) ATE202151T1 (de)
BR (1) BR9505758A (de)
DE (1) DE69521276T2 (de)
DK (1) DK0717116T3 (de)
ES (1) ES2159614T3 (de)
FR (1) FR2727981B1 (de)
GR (1) GR3036386T3 (de)
MX (1) MX9505194A (de)
PT (1) PT717116E (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103526117A (zh) * 2012-07-03 2014-01-22 广西柳工机械股份有限公司 非调质钢、用其制造的工程机械半轴及半轴制造方法

Families Citing this family (19)

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FR2744733B1 (fr) * 1996-02-08 1998-04-24 Ascometal Sa Acier pour la fabrication de piece forgee et procede de fabrication d'une piece forgee
US5906691A (en) * 1996-07-02 1999-05-25 The Timken Company Induction hardened microalloy steel having enhanced fatigue strength properties
US6823812B2 (en) * 2001-05-25 2004-11-30 Von Wolske James P. Trim tabs and surface drive propeller bite control
FR2848226B1 (fr) * 2002-12-05 2006-06-09 Ascometal Sa Acier pour construction mecanique, procede de mise en forme a chaud d'une piece de cet acier, et piece ainsi obtenue
FR2848225B1 (fr) * 2002-12-05 2006-06-09 Ascometal Sa Acier pour construction mecanique, procede de mise en forme a chaud d'une piece de cet acier et piece ainsi obtenue
US20050039830A1 (en) * 2003-08-19 2005-02-24 Mark Christofis Induction heat treatment method and coil and article treated thereby
US20070246135A1 (en) * 2004-08-18 2007-10-25 Pollard Kennth Brian T Method of Manufacturing a Hardened Forged Steel Component
CN101899551B (zh) * 2009-05-26 2011-11-16 宁波市鄞州商业精密铸造有限公司 耐磨合金铸钢的热处理工艺
CN101899553B (zh) * 2009-05-26 2012-01-18 宁波市鄞州商业精密铸造有限公司 耐磨合金铸钢的热处理工艺及其设备
CN101899552B (zh) * 2009-05-26 2012-01-18 宁波市鄞州商业精密铸造有限公司 耐磨合金铸钢的热处理设备
CN102051455B (zh) * 2009-11-04 2012-07-04 宁波市鄞州商业精密铸造有限公司 一种低温耐磨合金铸钢的热处理工艺
WO2011100798A1 (en) 2010-02-20 2011-08-25 Bluescope Steel Limited Nitriding of niobium steel and product made thereby
ES2391322B1 (es) * 2011-04-29 2013-10-14 Consejo Superior De Investigaciones Científicas (Csic) ACERO BAINÍTICO 38MnV6, PROCEDIMIENTO DE OBTENCIÓN Y USO.
CN102433507B (zh) * 2012-01-16 2013-12-25 江苏省沙钢钢铁研究院有限公司 低屈强比易焊接高强钢板及其制备工艺
FR2992328A1 (fr) * 2012-06-26 2013-12-27 Peugeot Citroen Automobiles Sa Procede de traitement thermique d'une piece en acier
CN103522016B (zh) * 2013-10-17 2016-03-23 江苏星源电站冶金设备制造有限公司 半自磨机中筒体衬板的加工方法
CN106460084A (zh) * 2014-05-23 2017-02-22 麦格纳国际公司 结构部件的等温淬火
FR3022259A1 (fr) 2014-06-16 2015-12-18 Asco Ind Acier pour pieces mecaniques a hautes caracteristiques traitees superficiellement, et pieces mecaniques en cet acier et leur procede de fabrication
CN105506232B (zh) * 2015-12-10 2018-07-31 武汉华工激光工程有限责任公司 一种调整钢硬度的激光复合处理工艺

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JPS56130456A (en) * 1980-03-14 1981-10-13 Kobe Steel Ltd Hot rolled steel plate for flash butt welding and cold working
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JPH07116502B2 (ja) * 1988-12-03 1995-12-13 マツダ株式会社 鋼部材の製造方法
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103526117A (zh) * 2012-07-03 2014-01-22 广西柳工机械股份有限公司 非调质钢、用其制造的工程机械半轴及半轴制造方法

Also Published As

Publication number Publication date
PT717116E (pt) 2001-11-30
BR9505758A (pt) 1998-04-22
ATE202151T1 (de) 2001-06-15
GR3036386T3 (en) 2001-11-30
EP0717116A1 (de) 1996-06-19
US5667605A (en) 1997-09-16
DE69521276T2 (de) 2002-01-10
FR2727981A1 (fr) 1996-06-14
DK0717116T3 (da) 2001-10-01
ES2159614T3 (es) 2001-10-16
MX9505194A (es) 1997-05-31
DE69521276D1 (de) 2001-07-19
FR2727981B1 (fr) 1997-01-10

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