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EP0739993B1 - Stahl und Verfahren zur Herstellung von Bauteilen mit hoher Abriebfestigkeit - Google Patents

Stahl und Verfahren zur Herstellung von Bauteilen mit hoher Abriebfestigkeit Download PDF

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Publication number
EP0739993B1
EP0739993B1 EP96400737A EP96400737A EP0739993B1 EP 0739993 B1 EP0739993 B1 EP 0739993B1 EP 96400737 A EP96400737 A EP 96400737A EP 96400737 A EP96400737 A EP 96400737A EP 0739993 B1 EP0739993 B1 EP 0739993B1
Authority
EP
European Patent Office
Prior art keywords
steel
component
less
temperature
boron
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
EP96400737A
Other languages
English (en)
French (fr)
Other versions
EP0739993B2 (de
EP0739993A1 (de
EP0739993B8 (de
Inventor
Jean Beguinot
Jean-Georges Brisson
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.)
Cubic Defense Applications Inc
Original Assignee
Creusot Loire SA
Creusot Loire Industrie SA
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
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Application filed by Creusot Loire SA, Creusot Loire Industrie SA filed Critical Creusot Loire SA
Publication of EP0739993A1 publication Critical patent/EP0739993A1/de
Publication of EP0739993B1 publication Critical patent/EP0739993B1/de
Publication of EP0739993B2 publication Critical patent/EP0739993B2/de
Application granted granted Critical
Publication of EP0739993B8 publication Critical patent/EP0739993B8/de
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Expired - Lifetime legal-status Critical Current

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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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Definitions

  • the present invention relates to steels for manufacturing of parts with high abrasion resistance.
  • the object of the present invention is to remedy this disadvantage by proposing a steel making it possible to manufacture parts, and in particular sheets, easily weldable and cutable, and having a abrasion resistance comparable to that of parts according to the prior art.
  • the chemical composition of the steel comprises: 0.24% ⁇ C ⁇ 0.27% 0% ⁇ If ⁇ 1% 0% ⁇ Al ⁇ 1% 0.3% ⁇ Mn ⁇ 1.6% 0% ⁇ Ni ⁇ 2% 0.5% ⁇ Cr ⁇ 1.8% and satisfies relationships: 0.15% ⁇ Mo + W / 2 ⁇ 0.45% and 0.6% ⁇ Si + Al ⁇ 1%
  • the part can be soaked in oil, this is particularly the case when the part is a sheet of thickness included between 10mm and 100mm.
  • the room To cool the room down to room temperature, from the austenitization temperature, the room to air. This is particularly the case when the part is a sheet between 2mm and 20mm thick.
  • the invention relates to an abrasion resistant part made of steel according to the invention having a martensitic structure or martensito-bainitic containing between 5% and 15% of austenite, and having a hardness between 400HB and 500HB.
  • Parts in accordance with the invention, or manufactured by the process according to the invention can be used for manufacturing wearing parts for equipment intended, in particular, for the exploitation of quarries and mines, public works, cement plants, steel, tile, brick or agriculture.
  • A remains less than or equal to 3.7.
  • This steel due to its relatively low carbon content, has good weldability and good cutting ability by thermal means, but its abrasion resistance depends on its micrographic structure and therefore of the heat treatment to which it is submitted.
  • this steel has a structure consisting mainly of martensite or a mixture of martensite and bainite (martensito-bainitic structure) and from 5% to 15% retained austenite enriched in carbon, so as to have a hardness between 450HB and 500HB, its abrasion resistance was very comparable to that of martensitic steels with a hardness greater than 550HB and its ability to cold form by plastic deformation was good better.
  • Good abrasion resistance results from the fact that, under the action of abrasive particles, the retained austenite is transformed locally in very hard martensite while benefiting from the ability to significantly deform the stressed metal.
  • the presence of a fine dispersion of chromium carbides and molybdenum in the martensitic constituent improves wear resistance.
  • the inventors have also found that, to obtain this structure, it was necessary to austenitize the steel by heating above Ac 3 , then to cool it to ambient temperature so that the cooling rate between the austenitization temperature and 450 ° C is greater than 1 ° C / s, and the time for the passage from the temperature of 450 ° C to the temperature of 200 ° is between 50 s and 60 min, and preferably between 100 s and 30 min.
  • This heat treatment can optionally be supplemented by tempering at a temperature below 250 ° C. for a time of less than 3 hours.
  • a steel is produced in accordance with the invention, it is cast in the form of a semi-finished product which is then shaped by hot plastic deformation, for example by rolling or forging.
  • the part thus obtained is then austenitized by heating above Ac 3 , then cooled to ambient temperature so that, at any point, the cooling rate between the austenitization temperature and 450 ° C. is greater than 1 ° C / s, and the passage time from the temperature of 450 ° C to the temperature of 200 ° is between 50s and 60mn, and preferably between 100s and 30mn.
  • the part is subjected to tempering at a temperature below 250 ° C for a time of less than 3 hours.
  • the slow speed crossing of the 450 ° C / 200 ° C range has to allow the retention of metastable austenite, while promoting the formation of fine chromium and molybdenum carbides, homogeneously distributed in the martensitic constituent or martensito-bainitic.
  • the part When the massiveness of the room is suitable, to cool the room to room temperature, from room temperature austenitization, the part can be soaked in oil. It is notably the case when the part is a sheet of thickness between 10mm and 100mm.
  • the part when the massiveness of the piece lends itself to it, to cool the room to room temperature, from the austenitization temperature, the part can also be quenched with air. This is particularly the case when the part is a sheet of thickness included between 2mm and 20mm.
  • a part, and in particular a sheet, resistant, is thus obtained.
  • abrasion, made of steel according to the invention having a structure martensitic or martensito-bainitic containing between 5% and 15% austenite, and having a hardness between 400HB and 500HB.
  • compositions of these steels were, in thousandths of% by weight: VS Yes Al Mn Or Cr Mo B AT 247 817 63 1290 495 726 328 2.8 B 251 263 704 1305 439 715 342 2.6 VS 254 310 65 1329 445 702 351 2.6 D 415 307 62 1285 293 712 349 2.7
  • the TD sheet in accordance with the prior art, has a structure fully martensitic, a hardness greater than 550HB and an index of abrasion resistance of 100; but because of the carbon content of steel, it is difficult to weld.
  • TA3 sheet made of steel according to the invention, has been soaked in water, which gives it a different structure than that which is required by the invention, and it has a resistance index to abrasion of 70, significantly lower than that of sheets TA1, TA2 and TB according to the invention, which are comparable to that of the sheet TD of reference.
  • TA1 and TB sheets are also different from TD sheets by their folding ability; TA1 and TB sheets can be folded on a radius equal to 6 times the thickness, while the TD sheet cannot be folded on a radius less than 15 times the thickness.
  • parts in general, and sheets in particular, in accordance with the invention are particularly suitable for the manufacture of any type of wear part subject to severe abrasion and incorporated, in particular, in equipment for handling of bulk products in all types of industries.
  • these parts can be attack blades and skids of reinforcement under loader / transporter or shovel bucket blades, guide plates for excavators and draglines, racks, drive crowns, sprockets, shields sides of impact or jaw crushers, screen grids for use in public works, in the exploitation of quarries or gravel pits; chain conveyor bottoms and squeegees, shields for hoppers or corridors, descender scales helical, sludge combs, classifier blades, pieces of slaughter or transport equipment, cyclone skirts for the exploitation of mines or coal mines; hopper shields or skips, clamshell blades, coke car bottoms, vibrating extractors, blasting chamber shields, guide or shift plates for the steel industry;

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  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Physical Vapour Deposition (AREA)

Claims (11)

  1. Stahl zur Herstellung von Bauteilen mit hoher Abriebfestigkeit, dadurch gekennzeichnet, dass er die folgende chemische Zusammensetzung in Gewichtsprozenten aufweist: 0,24% ≤ C ≤ 0,3% 0% ≤ Si ≤ 2% 0% ≤ Al ≤ 2% 0% ≤ Mn ≤ 2% 0% ≤ Ni ≤ 4% 0% ≤ Cr ≤ 3% 0% ≤ Mo ≤ 0,6% 0% ≤ W ≤ 1,2% ggf. 0,0005% bis 0,005% Bor, ggf. wenigstens ein Element das ausgewählt ist aus Nb, V, Zr und Ti mit Anteilen von weniger als 0,3%, ggf. wenigstens ein Element das ausgewählt ist aus Se, Te, Ca, Bi und Pb mit Anteilen von weniger als 0,1%, Rest Eisen und aus der Verarbeitung stammende Verunreinigungen,
    wobei diese chemische Zusammensetzung außerdem die folgenden Bedingungen erfüllt: 0,6% ≤ Al+Si ≤ 2% und 4,6xC+1,05xMn+0,54xNi+0,66x(Mo+W/2)+0,5xCr+K ≥ 1,6 mit
       K = 0 wenn der Stahl weniger als 0,0005% Bor enthält
       K = 0,5 wenn der Stahl mehr als 0,0005% Bor enthält.
  2. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass die chemische Zusammensetzung in Gewichtsprozenten aufweist: 0,24% ≤ C ≤ 0,27% 0% ≤ Si ≤ 1% 0% ≤ Al ≤ 1% 0,3% ≤ Mn ≤ 1,6% 0% ≤ Ni ≤ 2% 0,5% ≤ Cr ≤ 1,8% wobei die chemische Zusammensetzung im übrigen die folgenden Bedingungen erfüllt: 0,15% ≤ Mo + W/2 ≤ 0,45% und 0,6% ≤ Si + Al ≤ 1%
  3. Stahl nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass die chemische Zusammensetzung außerdem die folgende Beziehung erfüllt: 4,6xC+1,05xMn+0,54xNi+0,66x(Mo+W/2)+0,5xCr+K ≤ 3,7 mit
       K = 0 wenn der Stahl weniger als 0,0005% Bor enthält
       K = 0,5 wenn der Stahl mehr als 0,0005% Bor enthält.
  4. Verfahren zur Herstellung eines Bauteils aus Stahl mit hoher Abriebfestigkeit, dadurch gekennzeichnet, dass
    ein Bauteil hergestellt wird aus einem Stahl nach einem der Ansprüche 1 bis 3;
    das Bauteil durch Erwärmung auf einen Wert oberhalb von Ac3 austenisiert wird, danach auf die Umgebungstemperatur derart abgekühlt wird, dass an jeder Stelle des Bauteils die Abkühlgeschwindigkeit zwischen der Austenisierungstemperatur und 450°C oberhalb von 1°C/s liegt und die Übergangszeit der Temperatur von 450°C auf eine Temperatur von 200°C zwischen 50s und 60mn und vorzugsweise zwischen 100s und 30mn liegt;
    ggf. auf eine Temperatur von weniger als 250°C während einer Zeit von weniger als 3 Stunden zurückgekehrt wird.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass zur Abkühlung des Bauteils auf die Umgebungstemperatur ausgehend von der Austenisierungstemperatur das Bauteil in Öl getaucht wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass das Bauteil ein Blech ist, dessen Dicke zwischen 10 mm und 100 mm liegt.
  7. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass zur Abkühlung des Bauteils auf die Umgebungstemperatur, ausgehend von der Austenisierungstemperatur, das Bauteil in Luft getaucht wird.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Bauteil ein Blech ist mit einer Dicke zwischen 2 mm und 20 mm.
  9. Bauteil hoher Abriebfestigkeit, dadurch gekennzeichnet, dass es aus einem Stahl nach einem der Ansprüche 1 bis 3 besteht, und dass der das Bauteil bildende Stahl eine Martensit-Struktur oder eine Martensit-Bainit-Struktur aufweist, die 5% bis 15% Austenit enthält und die eine Härte zwischen 400HB und 500HB aufweist.
  10. Verwendung eines Bauteils nach Anspruch 9 zur Herstellung von einem starken Abrieb unterworfenen Abnutzungsteilen.
  11. Verwendung eines Bauteils, das nach dem Verfahren gemäß einem der Ansprüche 4 bis 8 hergestellt worden ist, zur Herstellung von einem Abrieb unterworfenen Abnutzungsteilen.
EP96400737A 1995-04-27 1996-04-05 Stahl und Verfahren zur Herstellung von Bauteilen mit hoher Abriebfestigkeit Expired - Lifetime EP0739993B8 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9505016A FR2733516B1 (fr) 1995-04-27 1995-04-27 Acier et procede pour la fabrication de pieces a haute resistance a l'abrasion
FR9505016 1995-04-27

Publications (4)

Publication Number Publication Date
EP0739993A1 EP0739993A1 (de) 1996-10-30
EP0739993B1 true EP0739993B1 (de) 1999-12-01
EP0739993B2 EP0739993B2 (de) 2005-11-23
EP0739993B8 EP0739993B8 (de) 2006-03-08

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ID=9478471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400737A Expired - Lifetime EP0739993B8 (de) 1995-04-27 1996-04-05 Stahl und Verfahren zur Herstellung von Bauteilen mit hoher Abriebfestigkeit

Country Status (11)

Country Link
US (1) US5714116A (de)
EP (1) EP0739993B8 (de)
JP (1) JP4058562B2 (de)
KR (1) KR100204545B1 (de)
AT (1) ATE187207T1 (de)
AU (1) AU692377B2 (de)
BR (1) BR9602054A (de)
DE (1) DE69605350T3 (de)
ES (1) ES2141446T5 (de)
FR (1) FR2733516B1 (de)
ZA (1) ZA963295B (de)

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CN111074151A (zh) * 2019-12-19 2020-04-28 宁国东方碾磨材料股份有限公司 一种高性能中碳低合金挖掘机齿座

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FR2838138B1 (fr) * 2002-04-03 2005-04-22 Usinor Acier pour la fabrication de moules d'injection de matiere plastique ou pour la fabrication de pieces pour le travail des metaux
DE10235219A1 (de) * 2002-08-01 2004-02-19 K.B.P. Kettenwerk Becker-Prünte Gmbh Stahl mit hoher Festigkeit und gleichzeitig guter Zähigkeit
FR2847271B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
FR2847270B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
FR2847272B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
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CN101880838A (zh) * 2010-06-13 2010-11-10 齐齐哈尔轨道交通装备有限责任公司 钢及其制成的车钩
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JP5683327B2 (ja) * 2011-03-07 2015-03-11 Ｊｆｅスチール株式会社 低温靭性に優れた耐摩耗鋼板
CN103459635B (zh) 2011-03-29 2016-08-24 杰富意钢铁株式会社 耐应力腐蚀开裂性优异的耐磨损钢板及其制造方法
US9938599B2 (en) 2011-03-29 2018-04-10 Jfe Steel Corporation Abrasion resistant steel plate or steel sheet excellent in resistance to stress corrosion cracking and method for manufacturing the same
EP2662462A1 (de) * 2012-05-07 2013-11-13 Valls Besitz GmbH Niedertemperatur-härtbare Stahle mit ausgezeichneter Bearbeitbarkeit
US9982331B2 (en) 2012-09-19 2018-05-29 Jfe Steel Corporation Abrasion resistant steel plate having excellent low-temperature toughness and excellent corrosive wear resistance
CN102978531B (zh) * 2012-11-09 2015-07-15 宁波嘉达精密铸造有限公司 挖掘机斗齿及其制备方法
DE202013012601U1 (de) 2013-07-03 2017-11-28 J. D. Theile Gmbh & Co. Kg Kettenglied für Bergbauanwendungen
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CN104805377B (zh) * 2015-05-08 2017-04-19 南京理工大学 一种低合金超高强度钢及其制备方法
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KR20210142164A (ko) * 2019-03-27 2021-11-24 에스코 그룹 엘엘씨 굴착 버킷용 립
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Publication number Priority date Publication date Assignee Title
CN111074151A (zh) * 2019-12-19 2020-04-28 宁国东方碾磨材料股份有限公司 一种高性能中碳低合金挖掘机齿座
CN111074151B (zh) * 2019-12-19 2021-09-03 宁国东方碾磨材料股份有限公司 一种高性能中碳低合金挖掘机齿座

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DE69605350T3 (de) 2006-07-27
ZA963295B (en) 1996-11-06
JP4058562B2 (ja) 2008-03-12
KR960037857A (ko) 1996-11-19
AU5064896A (en) 1996-11-07
AU692377B2 (en) 1998-06-04
US5714116A (en) 1998-02-03
JPH08295990A (ja) 1996-11-12
DE69605350D1 (de) 2000-01-05
EP0739993B2 (de) 2005-11-23
ES2141446T5 (es) 2006-06-01
KR100204545B1 (ko) 1999-06-15
FR2733516B1 (fr) 1997-05-30
DE69605350T2 (de) 2000-08-24
EP0739993A1 (de) 1996-10-30
BR9602054A (pt) 1999-10-13
FR2733516A1 (fr) 1996-10-31
ATE187207T1 (de) 1999-12-15
EP0739993B8 (de) 2006-03-08
ES2141446T3 (es) 2000-03-16

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