EP3859025B1 - Matériau de couche extérieure pour rouleau à chaud et rouleau à chaud composite - Google Patents

Matériau de couche extérieure pour rouleau à chaud et rouleau à chaud composite Download PDF

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EP3859025B1
EP3859025B1 EP19889262.2A EP19889262A EP3859025B1 EP 3859025 B1 EP3859025 B1 EP 3859025B1 EP 19889262 A EP19889262 A EP 19889262A EP 3859025 B1 EP3859025 B1 EP 3859025B1
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Prior art keywords
roll
outer layer
hot
rolling
less
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German (de)
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EP3859025A1 (fr
EP3859025A4 (fr
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Naomichi IWATA
Takeshi Suzuki
Tomohisa Masumitsu
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JFE Steel Corp
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JFE Steel Corp
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    • 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
    • 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
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds
    • B22D13/102—Linings for moulds
    • 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
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • 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
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
    • 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
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/02—Hardening by precipitation

Definitions

  • the present invention relates to a composite hot-rolling roll and, in particular, to a composite hot-rolling roll and an outer layer material for a hot-rolling roll that are suitable for use in a hot-rolling finishing mill for steel sheets.
  • Patent Literature 1 proposes an outer layer material for such a work roll for rolling.
  • the outer layer material of a rolling roll contains C: 1.5 to 3.5%, Si: 1.5% or less, Mn: 1.2% or less, Ni: 5.5% or less, Cr: 5.5 to 12.0%, Mo: 2.0 to 8.0%, V: 3.0 to 10.0%, and Nb: 0.5 to 7.0%, in which Nb and V are present such that the contents of Nb, V, and C satisfy a specific relationship, and a ratio between Nb and V is within a specific range. It is stated that in this outer layer material, segregation of hard carbides is inhibited even in an instance in which a centrifugal casting method is used, and, therefore, the outer layer material of a rolling roll has excellent wear resistance and crack resistance.
  • Patent Literature 2 proposes an outer layer material of a rolling roll, the outer layer material containing C: 1.5 to 3.5%, Si: 1.5% or less, Mn: 1.2% or less, Cr: 5.5 to 12.0%, Mo: 2.0 to 8.0%, V: 3.0 to 10.0%, and Nb: 0.5 to 7.0%, in which Nb and V are present such that the contents of Nb, V, and C satisfy a specific relationship, and a ratio between Nb and V is within a specific range. It is stated that in this outer layer material, segregation of hard carbides is inhibited even in an instance in which a centrifugal casting method is used, and, therefore, wear resistance and crack resistance are improved; thus, the outer layer material significantly contributes to improving productivity in hot rolling.
  • Patent Literature 3 proposes an outer layer material of a rolling roll, the outer layer material containing C: 1.5 to 3.5%, Si: 0.1 to 2.0%, Mn: 0.1 to 2.0%, Cr: 5 to 25%, Mo: 2 to 12%, V: 3 to 10%, and Nb: 0.5 to 5%, in which a ratio between Mo and Cr is within a specific range, and the outer layer material has a carbide amount distribution in which the difference between adjacent maximum and minimum values is less than or equal to 20% of an average value, regarding a region extending 30 mm from a surface in a roll radius direction. It is stated that since laminated segregation is accordingly reduced, formation of segregation patterns is inhibited, and, therefore, the outer layer material of a rolling roll has excellent surface quality.
  • Patent Literature 4 describes a roll external layer material made by centrifugal casting for hot rolling, which has excellent wear resistance and fatigue resistance of a roll surface layer.
  • Patent Literature 5 describes a centrifugal cast caliber roll for a hot rolling mill having excellent wear resistance, excellent fatigue resistance, and excellent slip resistance.
  • Patent Literature 6 describes a roll external layer material made by centrifugal casting for hot rolling, which has excellent wear resistance and fatigue resistance of the roll surface layer.
  • Patent Literature 7 describes an outer layer material of a hot rolling roll made by centrifugal casting, which is excellent in wear resistance and an fatigue resistance of the roll surface layer.
  • Patent Literature 8 describes a centrifugally cast outer layer material for a roll and a centrifugally cast composite roll, the outer layer material and the composite roll being used for hot rolling and being excellent in wear resistance, and fatigue resistance of a roll surface layer.
  • Patent Literature 10 describes an outer layer material of a hot rolling roll made by centrifugal casting, which is excellent in wear resistance and a fatigue resistance of the roll surface layer.
  • Patent Literature 11 describes a roll surface layer material made by centrifugal casting for a hot rolling mill, the roll surface layer material including a roll surface layer with excellent fatigue resistance.
  • Patent Literature 12 describes improving the wear resistance, cracking resistance and grindability of a composite roll by integrating a roll external layer material in which the contents of C, Si, Mn, Cr, Mo, V, Nb, Fe and carbide and the structure of the substrate are specified with a shaft material constituted of cast iron by welding.
  • Patent Literature 13 describes a method for manufacturing a high-speed cutting cast iron product which has a fine solidified structure, is low in reduction of casting yield, and suppresses occurrence of defects of the cast product.
  • Patent Literature 14 describes a roll outer-layer material produced by centrifugal casting for hot rolling with excellent fatigue resistance in a roll surface-layer.
  • Patent Literature 15 describes the outer layer material of a roll for hot or cold rolling excellent in wear resistance and surface roughening resistance.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composite hot-rolling roll and an outer layer material for a hot-rolling roll that have a wear resistance and fatigue resistance comparable to or higher than those of the related art and in which porosities and shrinkage cavities are reduced.
  • porosities and shrinkage cavities are reduced, as stated above, refers to the following instances: when an X-ray CT measurement is performed on the surface of an outer layer material of a roll after irregularities and scales (an oxide layer) are removed therefrom by grinding, the measurement being performed with a maximum tube voltage of 225 kV, a tube voltage of 150 kV, and a tube current of 80 ⁇ A, a circle circumscribing a porosity or a shrinkage cavity in a captured image has a diameter of less than or equal to 0.50 mm.
  • the present inventors thoroughly investigated relationships between porosities and shrinkage cavities present in a hot-rolling roll and chemical components. As a result, it was discovered that porosities and shrinkage cavities are present near eutectic carbides (which are typically M 2 C-based, M 6 C-based, M 7 C 3 -based, and M 23 C 6 -based carbides), and the formation of porosities and shrinkage cavities is related to amounts of N, O, Al, and eutectic carbides.
  • eutectic carbides which are typically M 2 C-based, M 6 C-based, M 7 C 3 -based, and M 23 C 6 -based carbides
  • a ring-shaped roll material (outside diameter: 250 mm ⁇ , thickness: 65 mm, wall thickness: 55 mm) corresponding to an outer layer material of a roll was cast from molten metal by using a centrifugal casting method.
  • the molten metal was prepared in a high-frequency induction furnace.
  • the chemical composition of the molten metal contained, in mass%, C: 2.2%, Si: 0.7%, Mn: 0.6%, Cr: 7.0%, Mo: 1.0%, V: 4.0%, Nb: 1.5%, and P: 0.019%.
  • the content of Al and the content of N+O were varied over a range of 0.01 to 0.5 mass% and a range of 100 to 600 mass ppm, respectively.
  • the balance of the chemical composition was Fe and incidental impurities. Note that a pouring temperature was 1,500°C, and a centrifugal force in multiples of gravity for the outer circumference of the ring-shaped roll material was 150 G.
  • a quenching process and a tempering process were performed. The quenching process was carried out by heating the ring-shaped roll material to a heating temperature of 1,030°C and then cooling the ring-shaped roll material by air cooling. Furthermore, the tempering process was performed two or three times, depending on the components, at a temperature of 500°C so that an amount of retained austenite could be less than 10% in terms of vol.%.
  • Fig. 1 After irregularities and scales (an oxide layer) on the surface of the obtained ring-shaped roll material were removed by grinding, three X-ray CT measurement test pieces (20 ⁇ 20 ⁇ 50 mm) were taken therefrom and subjected to an X-ray CT measurement to investigate the presence or absence of porosities and shrinkage cavities.
  • the three X-ray CT measurement test pieces 2 were taken from portions of a ring-shaped test material 1, which were spaced from one another by 120° at a width-wise center.
  • Fig. 2 is an example of a shrinkage cavity 3 in a test piece, which was identified in the X-ray CT measurement.
  • a relationship between the diameter of the circle circumscribing a porosity or a shrinkage cavity and the sum (N+O) of the contents of N and O is shown in Fig. 4
  • a relationship between an amount of Al and wear resistance is shown in Fig. 5 .
  • the amount of N and the amount of O mentioned here relate to N and O dissolved in the matrix and do not relate to N and O that are present as inclusions (nitrides and oxides) in steel.
  • Shrinkage cavities are shrinkage cavities. By ensuring that the amount of eutectic carbides falls within an appropriate range, a size of shrinkage cavities can be reduced.
  • N and O may be originally present in a raw material, and N and O may be unintentionally incorporated in molten metal during the melting of raw materials as a result of contact of molten metal with air. Accordingly, by adjusting the raw materials to be used and/or covering a surface with an inert gas (e.g., Ar) to prevent contact of the molten metal with air during melting, N+O can be adjusted.
  • an inert gas e.g., Ar
  • the adjustment can also be made with the Al content.
  • the amount of eutectic carbides can be adjusted with the contents of Mo, Cr, and C, which form eutectic carbides.
  • An outer layer material of a roll of the present invention is produced by a casting method, such as a known centrifugal casting method or continuous pouring process for cladding. While the outer layer material can be directly used as a ring roll or a sleeve roll, the outer layer material is used as an outer layer material for a composite hot-rolling roll that is suitable for hot finish rolling. Furthermore, a composite hot-rolling roll of the present invention is formed of an outer layer and an inner layer, which is integrally fused with the outer layer. Note that an intermediate layer may be disposed between the outer layer and the inner layer. That is, an intermediate layer integrally fused with the outer layer, and, an inner layer integrally fused with the intermediate layer may be employed in place of an inner layer integrally fused with the outer layer.
  • the outer layer material for a hot-rolling roll of the present invention has a chemical composition that contains, in mass%, C: 1.6 to 2.5%, Si: 0.2 to 1.5%, Mn: 0.2 to 1.6%, Cr: 4.5 to 7.0%, Mo: 1.0 to 5.0%, V: 4.0 to 6.0%, Nb: 0.5 to 2.5%, Al: 0.01 to 0.30%, optionally P: 0.040% or less, and optionally S: 0.05% or less, Ni: 0.15% or less, Cu: 0.20% or less, Ca: 0.01% or less, Sb: 0.01% or less, Ti: 0.05% or less, Zr: 0.05% or less, and B: 0.008% or less, wherein the total amount of S, Ni, Cu, Ca, Sb, Ti, Zr, and B is less than or equal to 0.5%, in which the sum of the contents of N and O of the chemical composition is 100 to 400 mass ppm, the contents of C, V, Mo, and Nb satisfy formula (1) and formula (2) below, and the
  • C has functions of increasing a hardness of a matrix by being dissolved into the matrix and of forming a hard carbide by combining with a carbide-forming element, thereby improving the wear resistance of an outer layer material of a roll. If a C content is less than 1.6%, an amount of carbides is insufficient, and, therefore, wear resistance is degraded. In addition, an amount of solidified eutectic crystals is low, and, therefore, shrinkage cavities form.
  • the C content is limited to a range of 1.6 to 2.5%.
  • the C content is greater than or equal to 1.7%.
  • the C content is less than or equal to 2.4%.
  • Si is an element that acts as a deoxidation agent and improves the castability of molten metal. Furthermore, Si has a function of strengthening a matrix by being dissolved into the matrix. Producing these effects requires the presence of Si in an amount of 0.2% or greater. If a Si content is less than 0.2%, the function of strengthening a matrix is not significantly exhibited, and, therefore, wear resistance is degraded. On the other hand, even if Si is present in an amount greater than 1.5%, the effects no longer increase, and, therefore, effects comparable to the content cannot be expected, which is economically disadvantageous; in addition, a structure of the matrix may be brittle, and, therefore, fatigue resistance may be degraded. Accordingly, the Si content is limited to 0.2 to 1.5%. Note that, preferably, the Si content is greater than or equal to 0.3%. Furthermore, preferably, the Si content is less than or equal to 1.3%.
  • Mn is an element that has a function of rendering S harmless by forming MnS, thereby immobilizing S, and since a portion of Mn is dissolved in a structure of a matrix, Mn has an effect of improving hardenability. Furthermore, Mn has a function of strengthening (solid-solution-strengthening) a matrix by being dissolved into the matrix. Producing these effects requires the presence of Mn in an amount of 0.2% or greater. If a Mn content is less than 0.2%, the function of strengthening a matrix is not significantly exhibited, and, therefore, wear resistance is degraded.
  • the Mn content is limited to 0.2 to 1.6%.
  • the Mn content is greater than or equal to 0.3%.
  • the Mn content is less than or equal to 1.4%.
  • Cr is an element that has functions of combining with C to primarily form a eutectic carbide, thereby improving wear resistance, and of reducing frictional force associated with a steel sheet, during rolling, thereby reducing surface damage in rolls to stabilize rolling. Producing these effects requires the presence of Cr in an amount of 4.5% or greater. If a Cr content is less than 4.5%, the amount of eutectic carbides is low, and, therefore, wear resistance is degraded. On the other hand, if Cr is present in an amount greater than 7.0%, coarse eutectic carbides are increased, and, therefore, fatigue resistance is degraded. Accordingly, when the Cr content is within a range of 4.5 to 7.0%, an outer layer material of a rolling roll that is obtained has excellent fatigue resistance. Note that, preferably, the Cr content is greater than or equal to 4.7%. Furthermore, preferably, the Cr content is less than or equal to 6.5%.
  • Mo is an element that combines with C to form a hard carbide, thereby improving wear resistance. Furthermore, Mo strengthens carbides by being dissolved into hard MC-type carbides in which V or Nb is bound to C. In addition, Mo is also dissolved into eutectic carbides, which results in an increase in the fracture resistance of the carbides. Via these functions, Mo improves the wear resistance and fatigue resistance of an outer layer material of a roll. Producing these effects requires the presence of Mo in an amount of 1.0% or greater. On the other hand, if Mo is present in an amount greater than 5.0%, Mo-based hard and brittle carbides form; as a result, hot-rolling contact fatigue resistance is degraded, and, therefore, fatigue resistance is degraded. Accordingly, a Mo content is limited to a range of 1.0 to 5.0%. Note that, preferably, the Mo content is greater than or equal to 1.2%. Furthermore, preferably, the Mo content is less than or equal to 4.9%.
  • V is an important element in the present invention, in terms of ensuring both a wear resistance and a fatigue resistance of a roll.
  • V is an element that forms a very hard carbide (MC-type carbide), thereby improving wear resistance, and that effectively acts to enable eutectic carbides to be divided and dispersedly crystallized, thereby improving hot-rolling contact fatigue resistance; hence, V is an element that significantly improves the fatigue resistance of an outer layer material of a roll.
  • Nb strengthens MC-type carbides by being dissolved into the MC-type carbides and, via the function of increasing the fracture resistance of MC-type carbides, improves wear resistance and, in particular, fatigue resistance.
  • wear resistance When both Nb and Mo are dissolved in carbides, fatigue resistance, as well as wear resistance, is noticeably improved.
  • Nb is an element that has a function of promoting the division of eutectic carbides, thereby inhibiting breakage of the eutectic carbides; hence, Nb is an element that improves the fatigue resistance of an outer layer material of a roll.
  • Nb also has a function of inhibiting segregation of MC-type carbides that may occur during centrifugal casting.
  • Nb is present in an amount of 0.50 or greater.
  • a Nb content is greater than 2.5%, the growth of MC-type carbides in molten metal is promoted, and, therefore, hot-rolling contact fatigue resistance is degraded. Accordingly, the Nb content is limited to a range of 0.5 to 2.5%. Note that, preferably, the Nb content is greater than or equal to 0.8%. Furthermore, preferably, the Nb content is less than or equal to 2.0%.
  • N and O are unintentionally incorporated into molten metal when nitrogen and oxygen present in a raw material and nitrogen and oxygen present in air are absorbed. Accordingly, amounts of N and O in molten metal can be adjusted by reducing amounts of nitrogen and oxygen present in a raw material; blocking air during the melting of raw materials (e.g., by covering the surface of molten metal with an inert gas, such as argon gas, to block air); reducing entrainment of air that may occur during the casting of molten metal that uses, for example, a centrifugal casting method or a continuous pouring process for cladding; and/or the like.
  • an inert gas such as argon gas
  • N+O is limited to a range of 100 to 400 mass ppm.
  • N+O is greater than or equal to 120 mass ppm, and more preferably, greater than or equal to 150 mass ppm.
  • N+O is less than or equal to 370 mass ppm, and more preferably, less than or equal to 350 mass ppm.
  • the balance other than the chemical composition described above, is Fe and incidental impurities.
  • the incidental impurities include S, Ni, Cu, Ca, Sb, Ti, Zr, and B. These are impurities present in a raw material and/or impurities unintentionally incorporated from a refractory material or the like. Regarding these incidental impurities, preferably, S: 0.05% or less, Ni: 0.15% or less, Cu: 0.20% or less, Ca: 0.01% or less, Sb: 0.01% or less, Ti: 0.05% or less, Zr: 0.05% or less, and B: 0.008% or less may be present.
  • incidental impurities When a total amount of these incidental impurities is less than or equal to 0.5%, neither wear resistance nor thermal fatigue resistance is adversely affected. Accordingly, it is sufficient that the total amount be less than or equal to 0.5%. Note that, more preferably, the total amount is less than or equal to 0.4%.
  • incidental impurities Al and P may be unintentionally incorporated. The contents of these are Al: less than 0.01% and P: less than 0.010%.
  • Al 0.01 to 0.30% is present and P: 0.010 to 0.040% may be present.
  • Al is an element that forms an oxide and a nitride by combining with nitrogen and oxygen in molten metal and is, therefore, an element that inhibits the formation of porosities and shrinkage cavities.
  • Al is present in an amount of 0.01% or greater.
  • the Al content is 0.01 to 0.30%.
  • the Al content is greater than or equal to 0.02%.
  • the Al content is less than or equal to 0.25%.
  • the P content be within a range of 0.010 to 0.040%.
  • the P content is greater than or equal to 0.012%.
  • the P content is less than or equal to 0.035%.
  • %C, %V, %Nb, and %Mo are the contents (mass%) of the respective corresponding elements.
  • Mo is dissolved in MC-type carbides, so that solid solution strengthening is achieved, and, therefore, wear resistance is improved.
  • segregation of carbides is inhibited, and, therefore, wear resistance and fatigue resistance are improved. It is believed that a reason for the improvement in wear resistance and fatigue resistance is that in instances in which the contents of V, Nb, and C satisfy the range of formula (2), a process for the formation of a structure in the solidification of molten metal changes.
  • a method for producing the outer layer material of a roll be a method that uses a known casting method, such as a centrifugal casting method or a continuous pouring process for cladding. Note that, as will be appreciated, the present invention is not limited to these methods.
  • the centrifugal casting is to be performed by, first, pouring molten metal having a chemical composition corresponding to the above-described chemical composition of the outer layer material of a roll into a rotating mold in a manner such that a predetermined wall thickness is achieved; the mold has, on an inner surface thereof, a coating of a refractory material primarily made of zircon or the like, and a thickness of the coating is 1 to 5 mm.
  • a rotational speed of the mold be such that the multiples of gravity applied to an outer surface of a roll be within a range of 100 to 200 G.
  • the centrifugal casting be performed by, during the solidification of the outer layer material of a roll or after complete solidification thereof, pouring molten metal having a chemical composition corresponding to a chemical composition of the intermediate layer, while the mold is rotated.
  • the rotation of the mold be stopped, the mold be raised, and thereafter, static casting be performed to form an inner layer material.
  • the chemical compositions of the inner layer and the intermediate layer are not particularly limited. It is preferable that the inner layer, which is formed by static casting, be formed from spheroidal graphite cast iron (ductile cast iron) or compacted vermicular graphite cast iron (CV cast iron), which has excellent castability and mechanical properties, or, from forged steel or the like. In a roll produced by centrifugal casting, since the outer layer and the inner layer are integrally fused, the inner layer includes a component of the outer layer material unintentionally incorporated therein in an amount of approximately 1 to 8 %.
  • a carbide-forming element present in the outer layer material such as Cr or V
  • the inner layer becomes brittle. Accordingly, it is preferable that a ratio of unintentional incorporation of a component of the outer layer into the inner layer be limited to less than 6%.
  • the intermediate layer in instances in which an intermediate layer is to be formed, it is preferable that a material for the intermediate layer be graphitized steel, high-carbon steel (C: 1.5 to 3.0 mass%), hypoeutectic cast iron, or the like.
  • the intermediate layer and the outer layer are integrally fused, the intermediate layer includes a component of the outer layer unintentionally incorporated therein in an amount ranging from 10 to 95%. From the standpoint of limiting an amount of unintentional incorporation of a component of the outer layer into the inner layer, it is important to reduce the amount of unintentional incorporation of a component of the outer layer into the intermediate layer as much as possible.
  • the composite hot-rolling roll of the present invention be subjected to a heat treatment after being cast.
  • a heat treatment it is preferable that a step of performing heating at 950 to 1,100°C and then performing air cooling or air blast cooling be carried out, and further, a step of performing heating and holding at 480 to 570°C and subsequently performing cooling be carried out two or more times.
  • a preferred hardness of the composite hot-rolling roll of the present invention is 79 to 88 HS (Shore hardness), and a more preferred hardness thereof is 80 to 86 HS. If the hardness is less than 79 HS, wear resistance is degraded, and on the other hand, if the hardness is greater than 88 HS, cracks that formed in the surface of the hot-rolling roll during hot rolling cannot be easily removed by grinding.
  • a hardness as described above can be achieved by adjusting the heat treatment temperatures mentioned above.
  • Molten metal having a chemical composition corresponding to the chemical composition of an outer layer material of a roll shown in Table 1 was prepared in a high-frequency induction furnace, and then, a ring-shaped test material (ring roll, outside diameter: 250 mm ⁇ , thickness: 65 mm, wall thickness: 55 mm) was formed by using a centrifugal casting method. Note that a pouring temperature was 1,500°C, and a centrifugal force in multiples of gravity for the outer circumference of the ring-shaped roll material was 150 G. After the casting, a quenching process was performed in which the ring-shaped test material was heated to 1,030°C and cooled by air cooling.
  • X-ray CT measurement test pieces (20 ⁇ 20 ⁇ 50 mm) were taken therefrom and subjected to an X-ray CT measurement to investigate the presence or absence of porosities and shrinkage cavities.
  • Fig. 1 three pieces of the X-ray CT measurement test piece 2, were taken from portions of a ring-shaped test material 1, which were spaced from one another about a width-wise center by 120°.
  • the X-ray CT instrument which has a maximum tube voltage of 225 kV was used, and transmission images of the entire test piece were acquired at a tube voltage of 150 kV and a tube current of 80 ⁇ A.
  • the method for the wear test was as follows. A wear test piece (outside diameter: 60 mm ⁇ , thickness: 10 mm, chamfered) was taken from the obtained ring-shaped test material. The wear test was conducted by using a two-disc slip rolling method, in which the test piece and an opposing piece were used, as illustrated in Fig. 3 . The test piece 5 was rotated at 700 rpm while being water-cooled with cooling water 6.
  • a hot-rolling fatigue test piece (outside diameter: 60 mm ⁇ , thickness: 10 mm) was taken from the obtained ring-shaped roll material, and a hot-rolling fatigue test, which, according to the disclosure of Japanese Unexamined Patent Application Publication No. 2010-101752 , can reproducibly evaluate the fatigue resistance of an actual work roll for hot rolling, was conducted.
  • a notch depth t: 1.2 mm, circumferential length L: 0.8 mm
  • a notch depth t: 1.2 mm, circumferential length L: 0.8 mm
  • the edges of the rolling contact surface of the fatigue test piece were chamfered to have a chamfer 1.2 C.
  • the hot-rolling fatigue test was conducted by using a two-disc slip rolling method, in which the test piece 5 (hot-rolling fatigue test piece 5) having notches and the opposing piece 8, which had been heated, were used. That is, as illustrated in Fig.
  • the test piece 5 (hot-rolling fatigue test piece 5) was rotated at 700 rpm while being water-cooled with cooling water 6, and then, in a state in which the opposing piece 8 (material: S45C, outside diameter: 190 mm ⁇ , thickness: 15 mm), which had been heated to 800°C by a high-frequency induction heating coil 7, was pressed against the rotating test piece 5 at a load of 980 N, the opposing piece 8 was rolled at a slip ratio of 9%. The rolling was continued until the two notches 9 introduced into the hot-rolling fatigue test piece 5 were broken. The number of rolling cycles until breakage occurred was determined for each of the notches, and the average value thereof was designated as a hot-rolling fatigue life. In instances in which the hot-rolling fatigue life was greater than three hundred and fifty thousand cycles, an evaluation that significantly excellent fatigue life was achieved was made.
  • test pieces having a wear ratio of 0.97 or greater were rated as “O” (pass), and test pieces having a wear ratio of less than 0.97 were rated as “ ⁇ " (fail).
  • test pieces having greater than four hundred and ten thousand cycles (410,000 cycles) were rated as " ⁇ " (pass, particularly excellent)
  • test pieces having greater than three hundred and fifty thousand cycles and four hundred and ten thousand or fewer cycles 350,001 to 410,000 cycles
  • test pieces having fewer than or equal to three hundred and fifty thousand cycles (350,000 cycles) were rated as " ⁇ " (fail). Based on these, an overall evaluation was made.
  • test pieces that were free of the defects of porosities and shrinkage cavities had a rating of "O" (pass) for wear resistance, and had a rating of "O" (pass) for fatigue resistance were rated as “O” (pass) .
  • test pieces that were free of the defects of porosities and shrinkage cavities had a rating of "O" (pass) for wear resistance, and had a rating of " ⁇ " (pass, particularly excellent) for fatigue resistance were rated as “ ⁇ ” (pass, particularly excellent).
  • test pieces that had one or more of the following evaluations were rated as " ⁇ " (fail) for the overall evaluation: the defect of a porosity or a shrinkage cavity was "present”; the rating of " ⁇ " (fail) was given for wear resistance; and the rating of " ⁇ " (fail) was given for fatigue resistance.

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  • Mechanical Engineering (AREA)
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  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
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Claims (3)

  1. Matériau de couche externe pour un rouleau de laminage à chaud, le matériau de couche externe ayant une composition chimique qui contient, en pourcentage en masse,
    C : 1,6 à 2,5 %,
    Si : 0,2 à 1,5 %,
    Mn : 0,2 à 1,6 %,
    Cr : 4,5 à 7,0 %,
    Mo : 1,0 à 5,0 %,
    V : 4,0 à 6,0 %,
    Nb : 0,5 à 2,5 %,
    Al : 0,01 à 0,30 %,
    éventuellement P : 0,040 % ou moins, et
    éventuellement S : 0,05 % ou moins, Ni : 0,15 % ou moins, Cu : 0,20 % ou moins, Ca : 0,01 % ou moins, Sb : 0,01 % ou moins, Ti : 0,05 % ou moins, Zr : 0,05 % ou moins, et B : 0,008 % ou moins, dans lequel la quantité totale de S, Ni, Cu, Ca, Sb, Ti, Zr et B est inférieure ou égale à 0,5 %, dans lequel une somme des teneurs en N et O de la composition chimique est de 100 à 400 ppm en masse,
    les teneurs en C, V, Mo et Nb satisfont la formule (1) et la formule (2) ci-dessous, et le reste de la composition chimique est Fe et des impuretés accidentelles ; 1,60 ≤ % V + % Nb / % Mo ≤ 3,5
    Figure imgb0009
     9,00 ≤ % V + 0,5 × % Nb + 2,1 × % C ≤ 11,0
    Figure imgb0010
    où % C, % V, % Nb et % Mo sont les teneurs, en % en masse, des éléments correspondants respectifs.
  2. Matériau de couche externe pour un rouleau de laminage à chaud selon la revendication 1, dans lequel la composition chimique contient, en % en masse, P : 0,010 à 0,040 %.
  3. Rouleau de laminage à chaud composite, le rouleau de laminage à chaud composite ayant une structure à trois couches qui comporte une couche externe, une couche intermédiaire et une couche interne ou ayant une structure à deux couches qui comporte une couche externe et une couche interne,
    la couche externe comprenant le matériau de couche externe pour un cylindre de laminage à chaud selon la revendication 1 ou 2.
EP19889262.2A 2018-11-28 2019-11-08 Matériau de couche extérieure pour rouleau à chaud et rouleau à chaud composite Active EP3859025B1 (fr)

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JP2009274092A (ja) * 2008-05-14 2009-11-26 Jfe Steel Corp ハイス系鋳鉄鋳物の製造方法
JP2013087333A (ja) * 2011-10-19 2013-05-13 Jfe Steel Corp 耐疲労性に優れた熱間圧延用遠心鋳造製ロール外層材および熱間圧延用遠心鋳造製複合ロール

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JP2001247928A (ja) * 2000-03-06 2001-09-14 Nippon Steel Corp 圧延用複合ロールの外層材
JP2009274092A (ja) * 2008-05-14 2009-11-26 Jfe Steel Corp ハイス系鋳鉄鋳物の製造方法
JP2013087333A (ja) * 2011-10-19 2013-05-13 Jfe Steel Corp 耐疲労性に優れた熱間圧延用遠心鋳造製ロール外層材および熱間圧延用遠心鋳造製複合ロール

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