EP1625896A1 - Cylindre composite de carbure cémenté pour le laminage d'une bande métallique - Google Patents

Cylindre composite de carbure cémenté pour le laminage d'une bande métallique Download PDF

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Publication number
EP1625896A1
EP1625896A1 EP04019233A EP04019233A EP1625896A1 EP 1625896 A1 EP1625896 A1 EP 1625896A1 EP 04019233 A EP04019233 A EP 04019233A EP 04019233 A EP04019233 A EP 04019233A EP 1625896 A1 EP1625896 A1 EP 1625896A1
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EP
European Patent Office
Prior art keywords
cemented carbide
room temperature
outer layer
inner layer
layer
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.)
Granted
Application number
EP04019233A
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German (de)
English (en)
Other versions
EP1625896B1 (fr
Inventor
Toshiyuki Hattori
Hiroya Tomita
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to DE602004018309T priority Critical patent/DE602004018309D1/de
Priority to EP04019233A priority patent/EP1625896B1/fr
Priority to AT04019233T priority patent/ATE416856T1/de
Publication of EP1625896A1 publication Critical patent/EP1625896A1/fr
Application granted granted Critical
Publication of EP1625896B1 publication Critical patent/EP1625896B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/26—Hardness of the roll surface

Definitions

  • the present invention relates to a composite roll comprising an inner layer made of steel or iron having excellent toughness and a high-hardness outer layer of cemented carbide, suitable for strip rolling, and a method for evaluating the thermal cracking resistance of such a composite roll.
  • Cemented carbide rolls having much higher wear resistance than those of high-speed steel rolls, etc. were recently developed.
  • Cemented carbide is a sintered alloy comprising tungsten carbide (WC) bonded with metal elements such as Co, Ni, Fe, etc., which may contain carbides of Ti, Ta, Nb, etc. in addition to WC.
  • JP 58-39906 B discloses a small sleeve roll for rolling wires, which comprises a steel shaft having excellent toughness is fitted in a sleeve of WC-Co-Ni-Cr cemented carbide at a thermal shrinkage ratio of about 0.1/1000, with the sides of the sleeve mechanically fixed to the shaft by fixing rings, spacer rings, etc.
  • This type of a cemented carbide sleeve roll is relatively short, having an outer diameter of about 100-500 mm and a length of about 10-300 mm.
  • JP 10-5823 A discloses a composite sleeve comprising an inner sleeve layer of cast steel, an outer sleeve layer of cemented carbide diffusion-bonded to an outer surface of the inner sleeve layer, and a shaft fitted in the inner sleeve layer by shrink fitting, the cemented carbide being a sintered body of mixed powder comprising 60 to 90% by weight of hard particles of at least one of carbides, nitrides and carbonitrides of elements in the Groups IVa-VIa of the Periodic Table, the balance being substantially metal powder of at least one of Fe, Ni, Co, Cr, Mo and W, and a surface of the outer sleeve layer being provided with a residual compression stress of 100 MPa or more in a circumferential direction.
  • JP 10-5824 A discloses a composite roll comprising a cemented carbide outer layer diffusion-bonded to an outer surface of a cast steel shaft, the cemented carbide being a sintered body of mixed powder comprising 60 to 90% by weight of hard particles of at least one of carbides, nitrides and carbonitrides of elements in the Groups IVa-VIa of the Periodic Table, the balance being substantially metal powder of at least one of Fe, Ni, Co, Cr, Mo and W, and a surface of the outer layer being provided with a residual compression stress of 100 MPa or more in a circumferential direction.
  • JP 2002-301506 A discloses a composite roll comprising an inner iron layer, one or more intermediate layers of cemented carbide containing tungsten carbide particles, and an outer layer of cemented carbide containing tungsten carbide particles and metallurgically bonded to the intermediate layer, the amount of tungsten carbide particles in the intermediate layer being smaller than that in the outer layer.
  • cemented carbide rolls have much better wear resistance and spalling resistance than those of the conventional cast rolls and forged rolls.
  • the composite rolls of JP 10-5823 A and JP 10-5824 A are advantageous in that the fixing members used in the assembled cemented carbide roll of JP 58-39906 B are not needed.
  • they because they have outer layers of cemented carbide in the entire length of roll bodies, they are suitable even for the rolling of strips.
  • Cemented carbide rolls suffer from little seizure of steel strips because of high percentages of carbides such as WC, etc., and only a small amount of heat enters thereinto through roll surfaces. In addition, they have small thermal expansion coefficients. Accordingly, they undergo smaller thermal shock than conventional iron-based alloy rolls. However, because the cemented carbide rolls are likelier to suffer from cracks due to their high hardness, and generated cracks extremely easily propagate, resulting in the breakage of rolls and the peeling of outer layers in worst cases.
  • thermal crack resistance of the cemented carbide rolls there has been no parameter for evaluating thermal crack resistance of the cemented carbide rolls.
  • the mechanical strength of the cemented carbide roll does not necessarily have direct correlation with thermal crack resistance, and even cemented carbide rolls having high mechanical strength may be subjected to cracking due to thermal shock.
  • the precise evaluation of the thermal crack resistance of the cemented carbide roll has not practically been conducted.
  • an object of the present invention is to provide a cemented carbide composite rolls for strip rolling having excellent wear resistance and spalling resistance and resistant to accidents such as thermal cracking, breakage, etc.
  • Another object of the present invention is to provide a method for evaluating the thermal cracking resistance of a cemented carbide composite roll for strip rolling precisely and easily.
  • a preferred example of the cemented carbide composite roll of the present invention is a sleeve roll comprising a hollow cylindrical inner layer made of steel or iron, and an outer layer of cemented carbide bonded to an outer surface of the inner layer.
  • a ratio of the cross-sectional area of the inner layer to the cross-sectional area of the entire roll is preferably 0.5 or more in the cross section of the roll perpendicular to its longitudinal axis.
  • the surface of the outer layer is preferably provided with an in-plane residual compressive stress.
  • At least one intermediate layer is provided between the outer layer and the inner layer.
  • the intermediate layer is preferably made of cermet.
  • the cemented carbide composite roll of the present invention may be a solid composite roll, or an assembled composite roll comprising a shaft fitted in a composite sleeve roll by shrink fitting.
  • Figs. 1(a) to (d) show roll body portions of various cemented carbide composite rolls of the present invention.
  • Fig. 1(a) shows a solid composite roll comprising an inner layer (shaft) 1 made of steel or iron, and an outer layer 2 of cemented carbide bonded to the inner layer 1.
  • Fig. 1(b) shows a solid cemented carbide composite roll comprising an inner layer 1 bonded to an outer layer 2 of cemented carbide via an intermediate layer 3.
  • FIG. 1(c) shows a hollow cemented carbide composite sleeve roll comprising a hollow inner layer 1 bonded to an outer layer 2 of cemented carbide.
  • Fig. 1(d) shows a hollow cemented carbide composite sleeve roll comprising a hollow inner layer 1 bonded to an outer layer 2 of cemented carbide via an intermediate layer 3.
  • 4 represents a bonding interface.
  • the thermal shock coefficient R is determined from a four-point bending strength ⁇ c (MPa) at room temperature, an average thermal expansion coefficient ⁇ (°C -1 ) between room temperature and 800°C, a Poisson's ratio v at room temperature, and a Young's modulus E (MPa) at room temperature, each measured on a cemented carbide test piece cut out of the outer layer 2.
  • the fact that the outer layer 2 of cemented carbide has a large thermal shock coefficient R means that it has a large cracking resistance to rapid temperature change (thermal cracking resistance).
  • the thermal shock coefficient R is preferably 500 or more, more preferably 600 or more.
  • the surface of the outer layer of the cemented carbide composite roll is preferably provided with a residual compressive stress in advance.
  • the in-plane residual compression stress on the surface of the outer layer hinders the generated heat cracks from propagating.
  • the residual compression stress is preferably 100-500 MPa.
  • the residual compressive stress on the surface of the cemented carbide composite roll (particularly composite sleeve roll) is generated by the difference in strain between the outer layer and the inner layer, and its value increases as a ratio of the cross-sectional area of the inner layer to the cross-sectional area of the entire roll (inner layer/outer layer cross section ratio) in a cross section perpendicular to the longitudinal axis of the roll increases.
  • the inner layer/outer layer cross section ratio is preferably set at a predetermined value or more. Investigation on various designs has revealed that the inner layer/outer layer cross-section ratio of 0.5 or more would be able to give a sufficiently large residual compression stress to the roll surface.
  • the inner layer/outer layer cross-section ratio is more preferably 0.55 or more, most preferably 0.6 or more.
  • At least one intermediate layer of cermet such as cemented carbide or a metal is preferably formed between the outer layer of cemented carbide and the inner layer made of steel or iron to increase bonding strength between the outer layer and the inner layer.
  • at least an intermediate layer adjacent to the outer layer of cemented carbide is preferably a cermet such as cemented carbide comprising 30% by mass or more of a metal binder.
  • the thickness of the intermediate layer is preferably 1 mm or more.
  • the production method of the composite roll of the present invention comprises causing the metallurgical (diffusion) bonding of the outer layer of cemented carbide to the inner layer made of steel or iron by a vacuum-sintering method, a high-pressure sintering method or a hot-isostatic pressing (HIP) method.
  • a vacuum-sintering method causing the metallurgical (diffusion) bonding of the outer layer of cemented carbide to the inner layer made of steel or iron by a vacuum-sintering method, a high-pressure sintering method or a hot-isostatic pressing (HIP) method.
  • HIP hot-isostatic pressing
  • WC powder having an average particle size of 5 ⁇ m and 20% by mass of Co powder having an average particle size of 1 ⁇ m were mixed with alcohol for 20 hours in a ball mill, and dried to form a starting material powder of cemented carbide for the outer layer.
  • Produced using the above starting material powder of cemented carbide for the outer layer was a hollow sleeve (outer layer) of semi-sintered cemented carbide having an outer diameter of 700 mm, an inner diameter of 655 mm and a length of 2000 mm.
  • a dispersion of the above starting material powder of cermet for the intermediate layer in alcohol was applied with a brush to an outer surface of a hollow cylindrical inner layer made of steel (SCM440) having an outer diameter of 650 mm, an inner diameter of 500 mm and a length of 2000 mm, and dried to form an intermediate layer.
  • This inner layer was placed in a can for HIP having an inner diameter 700 mm and a length of 2000 mm in a center thereof, and the above semi-sintered hollow sleeve was placed outside the inner layer.
  • a strain gauge attached to a longitudinal center portion of the outer layer, an in-plane residual compression stress on the surface of the outer layer was measured by destructive method.
  • a test piece cut out of the composite sleeve in a diametric direction such that it included the inner layer, the intermediate layer and the outer layer was measured with respect to bending strength according to JIS R1601. The results are shown in Table 1.
  • WC powder having an average particle size of 10 ⁇ m and 20% by mass of Co powder having an average particle size of 1 ⁇ m were mixed with alcohol for 10 hours in a ball mill, and then dried to form a starting material powder of cemented carbide for the outer layer.
  • a hollow cylindrical inner layer of forged steel having an outer diameter of 650 mm, an inner diameter of 500 mm and a length of 2000 mm was placed in a steel can for HIP having an inner diameter of 710 mm and a length of 2000 mm, and a steel pipe partition having an inner diameter of 510 mm and a thickness of 2 mm was placed around the inner layer.
  • the above starting material powder of cemented carbide for the outer layer was charged between the inner surface of the can for HIP and the partition. Also, the above cermet powder for the intermediate layer was charged between the partition and the inner layer. The partition was then withdrawn, and a steel lid was welded on both ends of the can. The can was sealed after evacuation at 700°C. After confirming that there was no leak in the can for HIP, a HIP treatment was conducted at 1300°C and 1000 atom. After cooling, the can was removed by machining. Thus obtained was a cemented carbide composite sleeve having an inner layer/outer layer cross-section ratio of 0.75.
  • the resultant composite body was subjected to vacuum sintering at 1350°C.
  • the ultrasonic flaw detection of the resultant composite roll revealed that the outer layer and the inner layer were well bonded.
  • a cemented carbide composite roll in which a ratio of the cross-sectional area of the inner layer to the cross-sectional area of the entire roll was 0.8 in a cross section perpendicular to the longitudinal axis of the roll.
  • any of the cemented carbide composite rolls of Examples 1-3 had a thermal shock coefficient R of 400 or more, and sufficient bending strength.
  • a shaft of chromium-molybdenum steel was fitted in each cemented carbide composite sleeve of Examples land 2 by shrink fitting, and the resultant composite body was machined to a predetermined size to provide a cemented carbide composite roll.
  • Each cemented carbide composite roll of Examples 1-2 was used to roll a steel strip of 2 mm thick and 800 mm wide in a finishing stand of a hot strip mill. The observation of the roll surface after rolling revealed that the roll retained an extremely smooth surface, indicating that it had excellent wear resistance and spalling resistance. Also, few heat cracks were generated on the roll surface, and the propagation of cracks was limited.
  • the strip-rolling cemented carbide composite roll of the present invention comprises an outer layer of cemented carbide having a thermal shock coefficient R of 400 or more, it is excellent in wear resistance and spalling resistance, with suppressed generation of thermal shock cracks. In addition, the presence of a residual compressive stress in the outer layer prevents the generation of initial cracks and their propagation.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP04019233A 2004-08-12 2004-08-12 Cylindre composite de carbure cémenté pour le laminage d'une bande métallique Expired - Lifetime EP1625896B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE602004018309T DE602004018309D1 (de) 2004-08-12 2004-08-12 Hartmetall-Verbundwalze zum Bandwalzen
EP04019233A EP1625896B1 (fr) 2004-08-12 2004-08-12 Cylindre composite de carbure cémenté pour le laminage d'une bande métallique
AT04019233T ATE416856T1 (de) 2004-08-12 2004-08-12 Hartmetall-verbundwalze zum bandwalzen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04019233A EP1625896B1 (fr) 2004-08-12 2004-08-12 Cylindre composite de carbure cémenté pour le laminage d'une bande métallique

Publications (2)

Publication Number Publication Date
EP1625896A1 true EP1625896A1 (fr) 2006-02-15
EP1625896B1 EP1625896B1 (fr) 2008-12-10

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EP (1) EP1625896B1 (fr)
AT (1) ATE416856T1 (fr)
DE (1) DE602004018309D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2165790A1 (fr) 2008-09-12 2010-03-24 Robert Bosch GmbH Procédé de fabrication d'un élément d'un materiau composite et élément d'un materiau composite

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10328713A (ja) * 1997-03-25 1998-12-15 Kawasaki Steel Corp 冷間圧延用複合ロール
JP2001025803A (ja) * 1999-07-09 2001-01-30 Kawasaki Steel Corp 金属板の圧延機および圧延方法
JP2001087805A (ja) * 1999-09-21 2001-04-03 Hitachi Metals Ltd 超硬合金製複合スリーブ
US20020124688A1 (en) * 1998-01-27 2002-09-12 Dah-Ben Liang Thermal fatigue and shock-resistant material for earth-boring bits
US20030198417A1 (en) * 2001-03-02 2003-10-23 Toyohisa Yamamoto Rolling device
JP2004167503A (ja) * 2002-11-18 2004-06-17 Hitachi Metals Ltd 超硬合金製圧延用複合ロール

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10328713A (ja) * 1997-03-25 1998-12-15 Kawasaki Steel Corp 冷間圧延用複合ロール
US20020124688A1 (en) * 1998-01-27 2002-09-12 Dah-Ben Liang Thermal fatigue and shock-resistant material for earth-boring bits
JP2001025803A (ja) * 1999-07-09 2001-01-30 Kawasaki Steel Corp 金属板の圧延機および圧延方法
JP2001087805A (ja) * 1999-09-21 2001-04-03 Hitachi Metals Ltd 超硬合金製複合スリーブ
US20030198417A1 (en) * 2001-03-02 2003-10-23 Toyohisa Yamamoto Rolling device
JP2004167503A (ja) * 2002-11-18 2004-06-17 Hitachi Metals Ltd 超硬合金製圧延用複合ロール

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 03 31 March 1999 (1999-03-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 16 8 May 2001 (2001-05-08) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 21 3 August 2001 (2001-08-03) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2165790A1 (fr) 2008-09-12 2010-03-24 Robert Bosch GmbH Procédé de fabrication d'un élément d'un materiau composite et élément d'un materiau composite
DE102008042065A1 (de) 2008-09-12 2010-03-25 Robert Bosch Gmbh Verfahren zur Herstellung eines Bauteiles aus einem Werkstoffverbund und Bauteil aus einem Werkstoffverbund

Also Published As

Publication number Publication date
EP1625896B1 (fr) 2008-12-10
ATE416856T1 (de) 2008-12-15
DE602004018309D1 (de) 2009-01-22

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