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WO1995024513A1 - Alliages d'acier et rouleaux de laminoir produits a partir de ceux-ci - Google Patents

Alliages d'acier et rouleaux de laminoir produits a partir de ceux-ci Download PDF

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Publication number
WO1995024513A1
WO1995024513A1 PCT/GB1995/000530 GB9500530W WO9524513A1 WO 1995024513 A1 WO1995024513 A1 WO 1995024513A1 GB 9500530 W GB9500530 W GB 9500530W WO 9524513 A1 WO9524513 A1 WO 9524513A1
Authority
WO
WIPO (PCT)
Prior art keywords
alloy
cast
amount
roll
cast alloy
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.)
Ceased
Application number
PCT/GB1995/000530
Other languages
English (en)
Inventor
Andrew David Anderson
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.)
DAVY ROLL Co Ltd
Original Assignee
DAVY ROLL Co Ltd
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 DAVY ROLL Co Ltd filed Critical DAVY ROLL Co Ltd
Priority to AU18580/95A priority Critical patent/AU1858095A/en
Publication of WO1995024513A1 publication Critical patent/WO1995024513A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Definitions

  • This invention is concerned with ferrous alloys , rolling mill rolls made therefrom , methods of making the alloys and the rolls and the use of the rolls in rolling mills .
  • High speed steel materials which are highly alloyed ferrous alloys are generally not usable or used in the cast state for traditional tooling applications as the mechanical properties of such cast materials are generally accepted as being undesirable. These materials are beginning to find use for rolling mill rolls, but it is generally accepted that rolls so made are more sensitive to fracture than traditional roll materials. This is an undesirable situation which this invention seeks to overcome.
  • the paper 'cast tool steels 1 the British Foundryman, July 1985, 289-296 discloses cast steel tools wherein the cast microstructure is refined and modified by using elements which are strongly carbide- forming, in particular titanium, vanadium and niobium, in making cast tool steels which are of the high speed steel type.
  • the paper is directed at improving the mechanical properties of cast tool steels and therefore make them more useful as cast tool steels but there remain problems with such materials.
  • European patent application EP-0-430-241-A1 describes high speed steel (HSS) rolling mill rolls hardened by additional vanadium with the intention to avoid separation of primary crystals in the molten steel.
  • EP-0-347-512-A1 discloses bimetallic rolls containing vanadium, titanium or niobium between 0.2-4% only to cause hardening by fine precipitation during heat-treatment. Further the alloy so described does not contain tungsten.
  • EP-0-346-293 discloses ferrous alloy rolling mill rolls of bi-metallic construction wherein the working surface has only globular carbides; the alloy including vanadium and optionally titanium and/or niobium to impart wear resistance.
  • niobium is essential as a primary carbide forming element and that whilst titanium and vanadium may be present as other strong carbide formers, they may be present in relatively minor amounts compared to the amount of niobium in the ferrous alloys. Therefore we prefer not to use titanium and/or vanadium as the principal carbide formers since the low density of their carbides can cause them to separate out.
  • niobium carbide which forms in the molten steel during casting is similar to the density of the molten steel. This is of particular importance in that aspect of this invention which is concerned with methods of making rolling mill rolls by centrifugal casting. Substantial differences in density between the principal carbide former and the molten steel would cause that carbide to separate out from the molten steel. Hence the refining process disclosed in the 'cast tool steels' paper could not be applicable to centrifugal casting of rolls and could still give separation problems in the static casting of rolls. By adding carefully controlled amounts of niobium with additional carbon to combine with it, we can modify and refine the cast structure of the base material, which is in the nature of a high speed steel.
  • niobium carbide is one of the hardest carbides, this also contributes significantly to increasing the wear resistance of the present alloys and rolls made therefrom. Moreover use of niobium enables production of the alloy and rolls wherein most of the carbides are physically precipitated by the casting process and only incidental precipitated by subsequent heat treatments.
  • Nb 1-10% preferably 2-8%, more preferably 4-8%
  • V 1-10% preferably 1.8 to 6% more preferably 1.8 to 3.8%
  • Co up to 5%, although it may be absent or no higher than 0.1%.
  • Ni up to 5%, for example 2 to 4%
  • Ti up to 3.0%, such as 0.1 to 3.0%, preferably 0.1 to 1.0% especially in centrifugally cast rolls.
  • N up to 3.0%, and
  • Ce and/or other rare earth element(s) up to 0.2% in total.
  • the total of V and Nb is preferably more than 3% by weight.
  • the total of niobium and optional elements present may also be more than 3% by weight.
  • the amount of niobium preferably matches or more preferably exceeds the amount of vanadium.
  • a third aspect we provide methods of statically casting a rolling mill roll from a ferrous alloy according to the first aspect.
  • the lack of flotation and/or sinkage of carbides is advantageous.
  • a fourth aspect we provide methods of centrifugally casting a rolling mill roll from a ferrous alloy as specified in the first aspect.
  • centrifugally cast rolls are preferred wherein centrifugal separation of the niobium carbides from the molten steel is avoided.
  • a rolling mill stand or a rolling mill train which comprises at least one roll as specified in the second aspect.
  • the principle of the invention and in particular of the third and fourth aspects thereof is to form solid particle.s in the liquid steel that will nucleate the growth of solid crystals or grains in the steel and thus refine its structure. This may be enhanced by the use of small additions of the following
  • Cerium (0.01 - 0.1%) or other Rare Earth metals that react with sulphur, which is present as an impurity in the liquid steel, and form cerium sulphide particles which may act as centres to promote the formation of niobium carbide particles.
  • the alley may advantageously contain up to 5% Cobalt. This improves the hot hardness of the alloy which is beneficial in a hot rolling mill. Cobalt also improves the heat-treatment characteristics in the manufacture of the roll.
  • the alloy may advantageously contain up to 5% Nickel. This stabilises the austenite phase during heat- treatment and may allow the use of a slower cooling rate as required in the manufacture of rolls to achieve optimum properties.
  • the rolls produced will be composite with an intermediate zone of the same composition as the core, or alternatively a cast steel core may be used.
  • the cores used may have a strength of the order 450 N/mm 2 .
  • the alloy rolls preferably have a fully martensitic structure, and excess carbon and retained austenite may be present.
  • Advantages over the 'cast tool steels' paper include an optimised composition and the optional use of cobalt and nickel to give the best combination of mechanical properties to make the material suitable for the working layer of rolling mill rolls. This includes achieving optimum hardness through control of carbide content and heat-treatment response.
  • Our invention seeks to create in the ferrous alloy and hence in the outer working surface of rolls primary crystals based on niobium since these can be controlled to avoid separation. This results in a refined icrostructure with improved properties, a more uniform carbide distribution and facilitates the use of much higher carbide contents for increased wear resistance.
  • the manufacturing procedure for producing the cast rolls will be known to those skilled in the art, although the Nb and Ti (if present) should be added as late as possible to the molten steel before casting.
  • the Ti may be added to the furnace or the ladle.
  • the required elemental additions may be by way of ferro-alloys.
  • the required amount of carbon that combines with the niobium, and Titanium if present, to form the NbC and (Nb,Ti) C carbides may be added at any stage during the melting of the alloy with no special precautions necessary.
  • a batch of sample alloy materials were cast statically and centrifugally using a ferrous alloy according to the first aspect and of the following composition:
  • a batch of sample alloy materials were cast statically and centrifugally using a ferrous alloy according to the first aspect and of the following composition:
  • the roll materials obtained in Examples 1-3 had attractive mechanical properties and wear resistance.
  • the ferrous alloy was multi-phase with a martensitic matrix.
  • Subsequent heat treatment can be applied for example tempering. It may only be necessary to use one tempering step and the majority of the carbides were found to have formed during the casting procedures and not in the subsequent heat treatments. However some secondary carbides (eg vanadium carbides) may form exclusively and intentionally during heat treatments.
  • titanium be added to the molten steel to promote the formation of NbC particles but we have found that its use is essential when the said alloys are centrifugally cast.
  • the smallest difference in density between the primary carbide particles and the molten steel can cause separation of the carbide particles to a greater or lesser extent.
  • the carbide particles are slightly denser than the molten steel and tend to centrifugally separate towards the outside of the mould.
  • a tungsten content in excess of 7% would be required to sufficiently increase the density of the molten steel.
  • titanium e.g. 0.01 to 3.0% by weight preferably 0.1 to 1.0% by weight of Ti
  • the liquid steel then it is incorporated into the carbide particles to form composite particles of the type (Ti, Nb) C whose density is strongly controlled by the titanium content.
  • Ti carbide is less dense than niobium carbide
  • the composite particles become less dense as their titanium content increases and hence their density may be tailored to that of the liquid steel. Further increases in the titanium content facilitate reductions in the tungsten content of the liquid steel which is advantageous in increasing the toughness of the alloy.
  • Example 4
  • a roll was centrifugally cast with an outer layer of the following composition:
  • the alloy formed can be regarded as multi ⁇ phase, containing several carbides which are not precipitated by heat treatment together with vanadium and secondary carbides which are precipitated by heat treatment.
  • the present process for producing rolls may only require one tempering step.
  • Heat-treatments preferably comprises a high temperature hardening treatment at 1000-1100°C followed by at least one tempering step at 450-580°C. However, depending upon the as- cast hardness of the roll the heat-treatment may comprise only at least one tempering step.
  • niobium as the principal carbide former in centrifugally cast rolls according to the invention is the minimal centrifugal separation of the niobium carbide from the molten steel.
  • This invention seeks to form primary carbides in the molten steel when centrifugally cast in contrast to inventions by others that seek to avoid primary carbide formation.
  • niobium carbide as the principal carbide former in rolls cast statically according to the invention is the lack of flotation or sinkage of the niobium carbide formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

Alliage ferreux de fonderie contenant, outre du fer et des impuretés inévitables, les constituants suivants dans des pourcentages se rapportant au pourcentage en poids: carbone 1,05 à 3,8 %, chrome 2,0 % à moins de 8,0 %, molybdène 1,0 à 8,0 %, tungstène 1,05 à 8 %, niobium 1,0 à 10,0 % et vanadium 1,0 à 10,0 %; cet alliage peut également contenir un ou plusieurs des éléments facultatifs suivants dans les pourcentages en poids suivants: manganèse jusqu'à 1,5 %, silicium jusqu'à 1,5 %, cobalt jusqu'à 5,0 %, nickel jusqu'à 5,0 %, titane jusqu'à 3,0 %, azote jusqu'à 3,0 % et cérium et/ou autres métaux des terres rares jusqu'à 0,2 % en tout. On peut fondre de tels alliages pour fabriquer des rouleaux de laminoir possédant des propriétés mécaniques intéressantes et dans lesquels on peut éviter une précipitation non souhaitée des carbures.
PCT/GB1995/000530 1994-03-11 1995-03-10 Alliages d'acier et rouleaux de laminoir produits a partir de ceux-ci Ceased WO1995024513A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18580/95A AU1858095A (en) 1994-03-11 1995-03-10 Steel alloys and rolling mill rolls produced therefrom

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9404786.7 1994-03-11
GB9404786A GB9404786D0 (en) 1994-03-11 1994-03-11 Rolling mill rolls

Publications (1)

Publication Number Publication Date
WO1995024513A1 true WO1995024513A1 (fr) 1995-09-14

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Country Link
AU (1) AU1858095A (fr)
GB (1) GB9404786D0 (fr)
WO (1) WO1995024513A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903420A3 (fr) * 1997-09-17 1999-12-15 Latrobe Steel Company Aciers rapides exempts de cobalt
EP1033191A1 (fr) * 1999-03-04 2000-09-06 Jean-Claude Werquin Cylindre de laminoir composite pour le laminage à chaud ou à froid et son procédé de fabrication
EP1298226A4 (fr) * 2001-04-27 2006-06-21 Honda Motor Co Ltd Alliage a base de fer et son procede de production
ITMI20090945A1 (it) * 2009-05-28 2010-11-29 Acos Villares Sa A process for the production of rolling mill cast rolls and a rolling mill cast roll
EP2064361A4 (fr) * 2006-08-28 2011-06-29 Villares Metals Sa Alliages durs avec une composition sèche
EP2374560A1 (fr) * 2009-01-14 2011-10-12 Böhler Edelstahl GmbH & Co KG Matière première résistant à l'usure
US8328703B2 (en) 2009-05-29 2012-12-11 Acos Villares S.A. Rolling mill cast roll
ES2394403A1 (es) * 2009-05-28 2013-01-31 Acos Villares S.A. Un procedimiento para la produccion de rodillos de fundicion para un laminador y un rodillo de fundicion para un laminador
RU2494162C1 (ru) * 2012-10-05 2013-09-27 Юлия Алексеевна Щепочкина Износостойкий сплав на основе железа
WO2015100472A1 (fr) 2013-12-30 2015-07-09 Weir Minerals Australia Ltd Produit métallique composite
US9410230B2 (en) 2005-04-29 2016-08-09 Koppern Entwicklungs Gmbh & Co. Kg Powder-metallurgically produced, wear-resistant material
CN112095053A (zh) * 2020-09-10 2020-12-18 宜兴市永昌轧辊有限公司 一种高耐磨冷轧辊及其制备方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237985A1 (de) * 1982-02-26 1983-09-22 Hitachi Metals, Ltd., Tokyo Verschleissfeste gusseisenlegierung
EP0309587A1 (fr) * 1987-03-24 1989-04-05 Hitachi Metals, Ltd. Rouleau composite resistant a l'abrasion et procede de production
JPH0353041A (ja) * 1989-07-20 1991-03-07 Sumitomo Metal Ind Ltd 熱間圧延用鍛造ロール
JPH05132735A (ja) * 1991-06-26 1993-05-28 Kubota Corp 高耐摩耗ロール材およびその鋳造法
JPH05311317A (ja) * 1992-05-12 1993-11-22 Kubota Corp 複合ロール
JPH05311316A (ja) * 1992-05-12 1993-11-22 Kubota Corp 薄肉外層ロール
JPH05320747A (ja) * 1992-05-21 1993-12-03 Kubota Corp 高耐摩耗ロールの製造法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237985A1 (de) * 1982-02-26 1983-09-22 Hitachi Metals, Ltd., Tokyo Verschleissfeste gusseisenlegierung
EP0309587A1 (fr) * 1987-03-24 1989-04-05 Hitachi Metals, Ltd. Rouleau composite resistant a l'abrasion et procede de production
JPH0353041A (ja) * 1989-07-20 1991-03-07 Sumitomo Metal Ind Ltd 熱間圧延用鍛造ロール
JPH05132735A (ja) * 1991-06-26 1993-05-28 Kubota Corp 高耐摩耗ロール材およびその鋳造法
JPH05311317A (ja) * 1992-05-12 1993-11-22 Kubota Corp 複合ロール
JPH05311316A (ja) * 1992-05-12 1993-11-22 Kubota Corp 薄肉外層ロール
JPH05320747A (ja) * 1992-05-21 1993-12-03 Kubota Corp 高耐摩耗ロールの製造法

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 197 (C - 0833) 21 May 1991 (1991-05-21) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 499 (C - 1109) 9 September 1993 (1993-09-09) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 128 (C - 1174) 2 March 1994 (1994-03-02) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 145 (C - 1178) 10 March 1994 (1994-03-10) *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903420A3 (fr) * 1997-09-17 1999-12-15 Latrobe Steel Company Aciers rapides exempts de cobalt
US6200528B1 (en) 1997-09-17 2001-03-13 Latrobe Steel Company Cobalt free high speed steels
EP1033191A1 (fr) * 1999-03-04 2000-09-06 Jean-Claude Werquin Cylindre de laminoir composite pour le laminage à chaud ou à froid et son procédé de fabrication
EP1298226A4 (fr) * 2001-04-27 2006-06-21 Honda Motor Co Ltd Alliage a base de fer et son procede de production
US7163593B2 (en) 2001-04-27 2007-01-16 Honda Giken Kogyo Kabushiki Kaisha Iron-based alloy and method for production thereof
US9410230B2 (en) 2005-04-29 2016-08-09 Koppern Entwicklungs Gmbh & Co. Kg Powder-metallurgically produced, wear-resistant material
EP2064361A4 (fr) * 2006-08-28 2011-06-29 Villares Metals Sa Alliages durs avec une composition sèche
EP2374560A1 (fr) * 2009-01-14 2011-10-12 Böhler Edelstahl GmbH & Co KG Matière première résistant à l'usure
ES2394403A1 (es) * 2009-05-28 2013-01-31 Acos Villares S.A. Un procedimiento para la produccion de rodillos de fundicion para un laminador y un rodillo de fundicion para un laminador
ITMI20090945A1 (it) * 2009-05-28 2010-11-29 Acos Villares Sa A process for the production of rolling mill cast rolls and a rolling mill cast roll
US8328703B2 (en) 2009-05-29 2012-12-11 Acos Villares S.A. Rolling mill cast roll
RU2494162C1 (ru) * 2012-10-05 2013-09-27 Юлия Алексеевна Щепочкина Износостойкий сплав на основе железа
WO2015100472A1 (fr) 2013-12-30 2015-07-09 Weir Minerals Australia Ltd Produit métallique composite
EP3089839A4 (fr) * 2013-12-30 2017-01-04 Weir Minerals Australia Ltd Produit métallique composite
CN112095053A (zh) * 2020-09-10 2020-12-18 宜兴市永昌轧辊有限公司 一种高耐磨冷轧辊及其制备方法

Also Published As

Publication number Publication date
AU1858095A (en) 1995-09-25
GB9404786D0 (en) 1994-04-27

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