EP2660344A1 - Rouleau de moulage par centrifugation pour les derniers socles de finition dans des laminoirs de tôles chaudes - Google Patents

Rouleau de moulage par centrifugation pour les derniers socles de finition dans des laminoirs de tôles chaudes Download PDF

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Publication number
EP2660344A1
EP2660344A1 EP20120166893 EP12166893A EP2660344A1 EP 2660344 A1 EP2660344 A1 EP 2660344A1 EP 20120166893 EP20120166893 EP 20120166893 EP 12166893 A EP12166893 A EP 12166893A EP 2660344 A1 EP2660344 A1 EP 2660344A1
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EP
European Patent Office
Prior art keywords
shell composition
roll
shell
roll according
composition
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.)
Withdrawn
Application number
EP20120166893
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German (de)
English (en)
Inventor
Jose Tinoco
Roger Finnström
Nils Bäckström
Jerôme Senaneuch
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.)
Akers AB
Original Assignee
Akers AB
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 Akers AB filed Critical Akers AB
Priority to EP20120166893 priority Critical patent/EP2660344A1/fr
Priority to PCT/EP2013/059296 priority patent/WO2013164469A1/fr
Publication of EP2660344A1 publication Critical patent/EP2660344A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/032—Rolls for sheets or strips

Definitions

  • the invention relates to a process for producing a centrifugally cast composite roll intended for last finishing stands in hot strip mills having surface properties, oxidation properties and wear resistance that are highly desirable for use in the hot rolling of steel.
  • the present invention also relates to a method for producing such a roll.
  • a continuously moving steel workpiece (the strip) is passed through a rolling mill which commonly consists of several stands of rolls arranged in a straight line (in tandem) or reversing (steckel).
  • the strip cools as it passes through the rolling mill, such that each succeeding stand is at a lower temperature than its predecessor stand.
  • each succeeding stand is at a lower temperature than its predecessor stand.
  • the strip reaches the rolls of the last few mill stands there is a tendency of the strip to stick to the rolls through which it passes because of the lower temperature of the roll.
  • the results of such behavior can be a catastrophic failure of the rolling process which may cause damages to the rolling mill stands and surrounding structures, not to mention the grave threat to workers in the area.
  • Vanadium and Niobium is known to form extremely hard MC carbides and it is also known that these carbides tend to segregate during centrifugal casting.
  • WO96/39544 discloses an IC roll alloy composition with Niobium and a method of producing such a roll.
  • This invention solves the problem of providing a roll shell composition and a centrifugal cast composite roll which has excellent wear resistance and crack resistance without any segregation even when productive and cost advantageous centrifugal casting method is employed by optimizing chemical compositions of the shell composition and controlling composition of proeutectic carbide.
  • EP O 560 210 Al discloses a roll which provides a compound roll having a shell portion having a fine metal structure with excellent uniformity.
  • US 2009/0092852 Al discloses a roll comprising vanadium which is developed to have high amounts of carbides in the outer layer.
  • a centrifugally cast composite roll comprising an outer layer having a composition comprising by mass 2.5-9 % of C, 0.1-3.5 % of Si, 0.1-3.5 % of Mn, and 11-40 % of V, the balance being Fe and inevitable impurities.
  • One object of the invention is to find a roll with improved wear resistance and improved surface properties. Another object is to provide a centrifugally cast composite roll comprising an outer layer containing a large amount of uniformly dispersed MC carbide, thereby exhibiting excellent wear resistance, surface roughening resistance and crack propagation resistance, as well as excellent spalling resistance.
  • Another object of the invention is to find a roll suitable for last finishing stands with special surface properties and also improved crack resistance compared to rolls suitable for earlier finishing stands.
  • an object of the invention is to find a roll with a high quality which is crucial for rolls suitable for last finishing stands with optimal oxidation properties is also desired in combination with improved wear resistance.
  • the invention relates to a process for producing a centrifugally cast composite roll intended for last finishing stands in hot strip mills and its shell composition composed of (weight %); C: 2.5-4.0%, Nb: 1.1-6.0%, V: 0.7-3.0, Ni: 4.2-4.6%, Mo:0.3-1.3%, Cr: 1.5-2.2%, Si: 0.7-1.6%, Mn:0.7-1.0%, Zr: 3% or less, Ti: 3% or less, P: 0.08% or less, S: 0.08% or less and balance with Fe and unavoidable impurities and the produced roll and its use.
  • a centrifugal cast roll according to the invention formed with a shell composition according to any of the claims 1-6 and a core selected from nodular iron and wherein the shell composition has oxidation kinetics measured at 900 seconds of 2-7 mg/cm 2 or 3.4-4.5 mg/cm 2 or 7 mg/cm 2 or less or 4 mg/cm 2 .
  • a centrifugal cast roll according to the invention formed with a shell composition according to any of the claims 1-6 and a core selected from nodular iron and wherein the shell composition has a hardness drop of 0.5-1,5 ShC per 10 mm shell depth.
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition of any of claims 1-6, comprising the steps of;
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, comprising roll according to the invention and wherein said testing is performed at a temperature of 1500-1520 °C of the melt.
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, wherein the casting of the shell composition is performed at a centrifugal force of 110-130G or at 120G.
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, and wherein the casting of the shell composition further comprises a step of applying flux material in 7-20 l/m 2 thickness on the inner part of the shell composition (106) which gives the roll a protective surface during casting of the core.
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, comprising and wherein the casting of the shell composition further comprises a step of applying flux material in 5-12 l/m 2 or 7-8 l/m 2 thickness on the inner part of the shell composition (106) which gives the roll a protective surface during casting of the core.
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, wherein the method further comprising a solidification step and wherein the average solidification rate of the casted roll is 2-3mm/min
  • a production method for a centrifugal cast roll according to the invention comprising the shell composition according to the invention, wherein the tempering of the roll shall be performed twice at a tempering temperature, TA, in the interval of 450-475 °C, or at 450 °C, during a retention time of 10-305 h with intermediate cooling to room temperature.
  • a centrifugal cast roll and its shell composition are disclosed.
  • the roll with the shell composition according to the invention may be used in steel hot rolling applications in steckel and late finishing stands of hot strip mills for example suitable for last finishing stands.
  • the roll according to the invention is a roll suitable for last finishing stands.
  • Last finishing stands need to have special surface properties and also improved crack resistance compared to rolls suitable for earlier finishing stands.
  • the quality is crucial for rolls suitable for last finishing stands and there is a need for improving work performance and wear resistance to be able to improve the productivity in the mill.
  • Optimal oxidation properties are also desired in combination with improved wear resistance.
  • shell composition shall mean an iron-based alloy intended for use in centrifugal casting the shell of a rolling mill roll and generally having a composition comprising (in weight %); Table 1 Element Weight % Carbon (C) 2.5 - 4.0 Niobium (Nb) 1.1 - 6.0 Vanadium (V) 0.7 - 3.0 Nickel (Ni) 4.2 - 4.6 Molybdenum (Mo) 0.3 - 1.3 Chromium (Cr) 1.5 - 2.2 Silicon (Si) 0.7 - 1.6 Manganese (Mn) 0.7 - 1.0 Phosphorus (P) ⁇ 0.08 Sulfur (S) ⁇ 0.08 Titanium (Ti) ⁇ 3 Zirconium (Zr) ⁇ 3 Iron (Fe) & impurities Balance
  • the shell of the centrifugal cast roll according to the invention comprises the shell composition and has a microstructure after casting that comprises MC carbides with a particle size between 7-35 ⁇ m in 2-3 area fraction %, where at least 65% of said carbides have a particle size larger than 9 ⁇ m or for example wherein less than 35% of the said carbides have a smaller size 9 ⁇ m. which gives the roll according to the invention improved wear and abrasion resistance.
  • C is an element for increasing for example hardness, and wear resistance in the roll material because it forms a hard carbide and is therefore required 2.5 %, preferably 3.3 % or more.
  • the crack resistance of the roll is however significantly lowered with a carbon content exceeding 4.0 %. Therefore, 4.0 % is set as the upper limit.
  • a preferred range is 3.3 - 3.8 % and even more preferred 3.4-3.8 %.
  • Si is a deoxidation agent. Si is an element necessary to maintain the casting ability, therefore 0.7% is set as lower limit. When the Si content is exceeding 1.6 % the crack resistance is not as effective and Si in larger quantities may promote defective graphite shapes in the structure. Si increases the carbon activity and promote carbide formation. A preferred range is 0,9-1.6%, and even more preferred 1.1-1.5 %.
  • Mn is necessary for the same purpose to Si.
  • the lower limit is chosen due to the fact that it promotes phase transformations occurring during heat treatment. However, it is not desirable to contain Mn in the content exceeding 1.0 % for lowering of the crack resistance. Therefore, 1.0 % is set as the upper limit.
  • a preferred range is 0.8-1-0%.
  • Cr is an essential element for a number of properties in the material but most important is to control the oxidation behavior in the material. Cr decreases the tendency of carbon to solidify as graphite. A preferred range is 1.6-2.2 %.
  • Mo is effective for forming the carbide and increasing wear resistance similarly to Cr, and, in addition, effective for strengthening the matrix by increasing hardenability. Therefore, Mo is added in the content of 0.3 %, preferably 0,5 % or more. However, when Mo content exceeds 1.3 %, the crack resistance is lowered. Therefore, 1.3% is set as the upper limit. A preferred range is 0.5-1.3, %, and even more preferred 0.7-1.2 %.
  • V 0.7-3.0 % or 0.8-3.0 %
  • Nb 1.1-6.0 %
  • composition according to the present invention may for example satisfy at least one of the following formulas: V + Mo / Nb ⁇ 0 , 35 0.95 ⁇ Mo / V ⁇ 1.16 0.69 ⁇ V / Nb ⁇ 0.84
  • V is an essential element for forming MC or M4 C3 carbides which are the most effective carbides for increasing the wear resistance. In order to attain the effect, it is required to be added in the content of 0.8 % or more. However, if it exceeds 3.0 %, the material becomes excessively brittle and difficult to handle. Therefore, the upper limit is set at 3.0 %. A preferred range is 0.8-1.2 %, and even more preferred 0.8-1.1 %.
  • Nb also forms MC carbide similarly to V, which is effective for increasing the wear resistance.
  • Nb when Nb is solely added, it forms large size carbide block that due to its size and density tend to segregate towards the outer periphery making impossible to obtain an even distribution. Therefore, Nb shall be added in combination with V in order to provide a desired carbide distribution.
  • the shell of an IC roll made from the shell composition according to the invention further contains 2.0-3.0 area % MC carbides 206 and 0,5-3 area % graphite 208 homogenously distributed in the matrix 210.
  • the microstructure in the shell of the roll according to the invention is showed in figure 13.
  • the composition of the comparative roll 12 is evident from Table 2.
  • the comparative roll 12 is also further disclosed in patent WO96/39544 .
  • the roll according to the invention is prepared in several steps using centrifugal casting technique.
  • the shell material in the roll according to the invention is the outermost 6-12% of the total roll diameter.
  • the rest of the roll comprises of core material for example nodular iron.
  • the casting of the outer shell and the core is made by casting in sequence from two (or more) different furnaces.
  • the casting from the different furnaces is controlled by controlling a set point (500) and the tapping into the casting ladle from the different furnaces is timed so that the casting of the core starts when the shell 2 has a desired temperature in order to avoid undesired remelting of the shell but still allow sufficient bonding between the core and the shell.
  • the shell temperature reaches the desired setpoint
  • casting of outer core part 3 of the core starts.
  • Tapping of the bottom core part 4 into the casting ladle starts before the setpoint for the outer core part 3 is reached so that casting of the roll bottom core part 4 may start when the setpoint is reached.
  • Casting of the top-neck core part 5 is controlled in an analogous manner.
  • the set point timing depends on thickness of core and heating capacity of the material.
  • the present invention includes an enhanced roll produced by a method comprising, but not limited to the following steps:
  • the present invention includes a roll produced by a method comprising the following steps:
  • the roll made according to the described method greatly enhances the abrasion resistance of the type of roll without reducing its resistance to welding to the strip or its resistance to initiation of cracks under shock loading, by maintaining a balance between free graphite and carbides in the chilled zone during eutectic solidification.
  • the roll according to the invention shows a more even distribution of the different phases (cementite, graphite and bainite/martensite) long the shell depth.
  • Alloys having graphite present in quantities greater than 8% of the total volume are generally too soft to be employed as the outer shell of the rolling mill roll, while alloys containing less than 0.5 % free graphite are not suitable to be deployed as a chill roll outer shell because they are not sufficiently resistant to thermal shock and do not have sufficient graphite to reliably prevent welding of the workpiece to the roll.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP20120166893 2012-05-04 2012-05-04 Rouleau de moulage par centrifugation pour les derniers socles de finition dans des laminoirs de tôles chaudes Withdrawn EP2660344A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20120166893 EP2660344A1 (fr) 2012-05-04 2012-05-04 Rouleau de moulage par centrifugation pour les derniers socles de finition dans des laminoirs de tôles chaudes
PCT/EP2013/059296 WO2013164469A1 (fr) 2012-05-04 2013-05-03 Cylindre de laminoir moulé par centrifugation pour dernières cages finisseuses dans des laminoirs à bandes à chaud

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120166893 EP2660344A1 (fr) 2012-05-04 2012-05-04 Rouleau de moulage par centrifugation pour les derniers socles de finition dans des laminoirs de tôles chaudes

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EP2660344A1 true EP2660344A1 (fr) 2013-11-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016180167A (ja) * 2015-03-25 2016-10-13 日立金属株式会社 連続鋳掛け肉盛鋳造製圧延用複合ロール
JP2016180168A (ja) * 2015-03-25 2016-10-13 日立金属株式会社 連続鋳掛け肉盛鋳造製圧延用複合ロール

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7302232B2 (ja) * 2018-03-30 2023-07-04 株式会社プロテリアル 熱間圧延用遠心鋳造複合ロール及びその製造方法

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57149452A (en) * 1981-03-10 1982-09-16 Kubota Ltd Composite mill roll
EP0066506A1 (fr) 1981-05-19 1982-12-08 Vetrotex Saint-Gobain Procédé et dispositif pour la fabrication de fibres de verre discontinues
EP0525932A1 (fr) * 1991-07-09 1993-02-03 Hitachi Metals, Ltd. Cylindre composite et procédé pour sa fabrication
WO1993014931A1 (fr) 1992-02-04 1993-08-05 Forcast International Cylindre de travail composite pour laminage a chaud de produits plats et procede de laminage en comportant application
EP0560210A1 (fr) 1992-03-06 1993-09-15 Hitachi Metals, Ltd. Cylindre composite et procédé pour sa fabrication
EP0559899A1 (fr) 1991-09-12 1993-09-15 Kawasaki Steel Corporation Materiau pour la couche exterieure d'un cylindre de laminage et cylindre composite fabrique par coulee par centrifugation
EP0593408A1 (fr) 1992-09-11 1994-04-20 BÖHLER Edelstahl GmbH Cylindre composite
US5403670A (en) 1992-12-21 1995-04-04 Hitachi Metals, Ltd. Compound sleeve roll and method for producing same comprising chamfered axial ends
JPH0881731A (ja) * 1994-07-11 1996-03-26 Kawasaki Steel Corp 熱間圧延用ロール及びその製造方法
WO1996039544A1 (fr) 1995-06-06 1996-12-12 Bo Tommy Kage Nylen Cylindre en fonte en coquille indefinie produit par addition de niobium
JPH1143735A (ja) 1997-07-24 1999-02-16 Kubota Corp 耐肌荒れ性にすぐれる黒鉛晶出ハイス系鋳鉄材
US6805757B1 (en) * 1999-04-22 2004-10-19 Eisenwerk Sulzau-Werfen R. & E. Weinberger Ag Casting material for indefinite rollers with sleeve part and method for producing the same
JP2005232519A (ja) 2004-02-18 2005-09-02 Jfe Steel Kk 熱間圧延用ロール外層材および熱間圧延用複合ロール
EP1832665A1 (fr) * 2004-09-13 2007-09-12 Hitachi Metals, Ltd. Couche externe obtenue par coulage centrifuge pour cylindre de laminage et procede de fabrication de celle-ci
EP1975265A1 (fr) 2005-12-28 2008-10-01 Hitachi Metals, Ltd. Rouleau composite de coulage par centrifugation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994022606A1 (fr) 1993-03-31 1994-10-13 Hitachi Metals, Ltd. Cylindre de laminage a chaud resistant a l'usure et au grippage

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57149452A (en) * 1981-03-10 1982-09-16 Kubota Ltd Composite mill roll
EP0066506A1 (fr) 1981-05-19 1982-12-08 Vetrotex Saint-Gobain Procédé et dispositif pour la fabrication de fibres de verre discontinues
EP0525932A1 (fr) * 1991-07-09 1993-02-03 Hitachi Metals, Ltd. Cylindre composite et procédé pour sa fabrication
EP0559899A1 (fr) 1991-09-12 1993-09-15 Kawasaki Steel Corporation Materiau pour la couche exterieure d'un cylindre de laminage et cylindre composite fabrique par coulee par centrifugation
WO1993014931A1 (fr) 1992-02-04 1993-08-05 Forcast International Cylindre de travail composite pour laminage a chaud de produits plats et procede de laminage en comportant application
US5484372A (en) 1992-03-06 1996-01-16 Hitachi Metals, Ltd. Compound roll and method of producing same
EP0560210A1 (fr) 1992-03-06 1993-09-15 Hitachi Metals, Ltd. Cylindre composite et procédé pour sa fabrication
EP0593408A1 (fr) 1992-09-11 1994-04-20 BÖHLER Edelstahl GmbH Cylindre composite
US5403670A (en) 1992-12-21 1995-04-04 Hitachi Metals, Ltd. Compound sleeve roll and method for producing same comprising chamfered axial ends
JPH0881731A (ja) * 1994-07-11 1996-03-26 Kawasaki Steel Corp 熱間圧延用ロール及びその製造方法
WO1996039544A1 (fr) 1995-06-06 1996-12-12 Bo Tommy Kage Nylen Cylindre en fonte en coquille indefinie produit par addition de niobium
JPH1143735A (ja) 1997-07-24 1999-02-16 Kubota Corp 耐肌荒れ性にすぐれる黒鉛晶出ハイス系鋳鉄材
US6805757B1 (en) * 1999-04-22 2004-10-19 Eisenwerk Sulzau-Werfen R. & E. Weinberger Ag Casting material for indefinite rollers with sleeve part and method for producing the same
JP2005232519A (ja) 2004-02-18 2005-09-02 Jfe Steel Kk 熱間圧延用ロール外層材および熱間圧延用複合ロール
EP1832665A1 (fr) * 2004-09-13 2007-09-12 Hitachi Metals, Ltd. Couche externe obtenue par coulage centrifuge pour cylindre de laminage et procede de fabrication de celle-ci
EP1975265A1 (fr) 2005-12-28 2008-10-01 Hitachi Metals, Ltd. Rouleau composite de coulage par centrifugation
US20090092852A1 (en) 2005-12-28 2009-04-09 Hitachi Metals, Ltd. Centrifugally cast composit roll

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016180167A (ja) * 2015-03-25 2016-10-13 日立金属株式会社 連続鋳掛け肉盛鋳造製圧延用複合ロール
JP2016180168A (ja) * 2015-03-25 2016-10-13 日立金属株式会社 連続鋳掛け肉盛鋳造製圧延用複合ロール

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