WO2015181852A1 - 熱延工場巻取り設備のロール - Google Patents

熱延工場巻取り設備のロール Download PDF

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Publication number
WO2015181852A1
WO2015181852A1 PCT/JP2014/002833 JP2014002833W WO2015181852A1 WO 2015181852 A1 WO2015181852 A1 WO 2015181852A1 JP 2014002833 W JP2014002833 W JP 2014002833W WO 2015181852 A1 WO2015181852 A1 WO 2015181852A1
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WIPO (PCT)
Prior art keywords
layer
roll
mass
hardness
rolling factory
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PCT/JP2014/002833
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English (en)
French (fr)
Inventor
司城　浩一
Original Assignee
日鉄住金ハード株式会社
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Filing date
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Application filed by 日鉄住金ハード株式会社 filed Critical 日鉄住金ハード株式会社
Priority to US15/035,096 priority Critical patent/US10040106B2/en
Priority to KR1020167013157A priority patent/KR101951809B1/ko
Priority to PCT/JP2014/002833 priority patent/WO2015181852A1/ja
Priority to JP2016522979A priority patent/JP6433493B2/ja
Priority to TW103123476A priority patent/TW201544205A/zh
Publication of WO2015181852A1 publication Critical patent/WO2015181852A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/02—Supporting web roll
    • B65H18/023—Supporting web roll on its outer circumference
    • B65H18/025—Parallel rollers type
    • 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
    • B21B27/021—Rolls for sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
    • B21C47/06—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
    • B21C47/06—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum
    • B21C47/063—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum with pressure rollers only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/18—Rolls or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/147—Roller pairs both nip rollers being driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/173—Metal

Definitions

  • the present invention relates to a roll of a hot rolling factory winding equipment, and particularly to a composition of a coating layer coated on the roll surface.
  • Patent Document 1 is mass%, C: 0.15%, Si: 0.40%, Mn: 1.80%, Cr: 3.0%, Mo: 2.0%, V: 0.80% , Ni: 2.0%, Co: 1.0%, the underlaying layer which the remainder consists of Fe and unavoidable impurities is disclosed.
  • Patent Document 2 is mass%, C: 0.25%, Si: 0.5%, Mn: 1.2%, Cr: 13.0%, Mo: 0.7%, Ni: 1.5%
  • An underlaying layer is disclosed that includes Fe and the inevitable impurities.
  • Patent Document 3 includes C: 0.26%, Si: 0.32%, Mn: 1.13%, Cr: 13.3%, Mo: 0.74%, Ni: 1.16%, and the balance Disclosed is an underlay layer composed of Fe and inevitable impurities.
  • this invention makes the shore hardness of a foundation overlay layer 60 or more in the roll of a hot rolling factory winding equipment provided with the upper surface self-fluxing alloy sprayed layer and the foundation overlay layer on the roll surface. With the goal.
  • the roll of the hot rolling factory winding equipment is (1) a base overlay layer on the body surface of the roll, and carbide particles dispersed on the base overlay layer.
  • the foundation overlay layer further contains one or more of Mo, V, and Co, and is expressed in mass%, Mo: 0.1 to 5.0, V: It may be 0.1 to 3.0, Co: 0.5 to 5.0.
  • the foundation build-up layer has a Shore hardness of 60 or more even when the self-fluxing alloy sprayed layer is fused a plurality of times.
  • the Shore hardness of the underlying overlay layer is set to 60 or more. Can do.
  • FIG. 1 is a schematic view of a hot rolling factory winding facility.
  • Fig. 1 is a schematic diagram of the hot rolling factory winding equipment.
  • the hot rolling mill winding equipment is located in the front stage of a plurality of coilers 3 that wind up a high temperature steel sheet 10 of 400 to 900 ° C. that has been rolled to a fixed size by a finish rolling mill and each coiler 3.
  • Upper and lower pinch rolls 1 and 2 are provided.
  • the plurality of coilers 3 and the upper and lower pinch rolls 1 and 2 are provided on the same rolling line.
  • the coiler 3 includes a mandrel 4 that winds up the steel plate 10, and a plurality of wrapper rolls 5 that are arranged around the mandrel 4 and press the steel plate 10 against the mandrel 4.
  • the upper and lower pinch rolls 1 and 2 are configured to change the direction of the steel sheet 10 conveyed from the finish rolling mill to the coiler 3 side obliquely below and wind it around the coiler 3 or to convey the steel sheet 10 on the downstream side as it is.
  • the coiler 3 is wound up.
  • the upper and lower pinch rolls 1 and 2 also have a function of applying a backward tension to the steel plate 10 so that the coiler 3 can stably wind the steel plate 10.
  • An underlaying layer is formed on the surface of the roll body of the pinch rolls 1 and 2 and the wrapper roll 5 described above, and a self-fluxing alloy sprayed layer in which carbide particles are dispersed is formed on the underlaying layer.
  • an iron-type metal can be used for the roll base material used for these pinch rolls 1 and 2 and the wrapper roll 5, that is, a roll base roll of a hot rolling factory.
  • a welding alloy in which 3 to 60 wt% of carbide particles are dispersed in the base metal can be used.
  • the base metal Ni-based metal, Co-based metal, and Fe-based metal can be used.
  • Abrasion resistance is increased by dispersing 3 to 60 wt% of carbide particles.
  • the amount of carbide particles added is less than 3 wt%, the distribution of carbide particles in the structure tends to be unevenly distributed due to the relationship between the size of the added carbide particles and the minute amount added, and sufficient wear resistance cannot be ensured.
  • the added amount of carbide particles exceeds 60 wt%, the cost is increased due to a decrease in the yield of the carbide, and cracks may be generated in the manufacturing process due to a decrease in the toughness of the coating itself, resulting in a fusing failure of the sprayed layer.
  • Carbides that can be granulated as a spraying material such as one or more of WC, W m C n , Cr 3 C 2 , NbC, VC, MoC, TiC, and SiC, can be used as the carbide dispersed in the welding alloy.
  • a spraying material such as one or more of WC, W m C n , Cr 3 C 2 , NbC, VC, MoC, TiC, and SiC
  • the carbide dispersed in the welding alloy can be used as the carbide dispersed in the welding alloy.
  • the wear resistance, thermal shock resistance, and slip seizure resistance characteristics of each roll can be changed.
  • a material suitable for the conditions of the hot rolling factory winding equipment can be appropriately selected.
  • a self-fluxing alloy sprayed layer is formed by fusing the above-mentioned welding alloy.
  • the fusing process is a process of reheating and remelting the sprayed powder after spraying. Even if this fusing process is performed a plurality of times, the shore hardness (Hs) of the foundation overlay layer of this embodiment does not become less than 60. That is, when fusing the welding alloy of the upper ground, the base overlay layer receives the heat, but in the base overlay layer disclosed in Patent Documents 1 to 3, the base overlay layer is heated multiple times. , Shore hardness (Hs) is greatly reduced.
  • the Shore hardness (Hs) does not decrease to less than 60, so it is recessed in the upper self-fluxing alloy sprayed layer, Cracks are less likely to occur.
  • the underlaying layer of the present embodiment has a Shore hardness of 60 or more, and by mass%, C: 0.1 to 0.4, Si: 2.0 or less, Mn: 3.0 or less, Cr : 1.0 to 15.0, Ni: 2.5 to 5.0 containing Fe-based overlay layer.
  • C 0.1 to 0.4
  • Si 2.0 or less
  • Mn 3.0 or less
  • Cr 1.0 to 15.0
  • Ni 2.5 to 5.0 containing Fe-based overlay layer.
  • 0.1 to 0.4 C is necessary to improve the mechanical strength and hardness of the overlay layer. However, if it exceeds 0.4 mass%, cracks occur during overlay welding.
  • Si 2.0 or less When Si exceeds 2.0% by mass, cracks occur during welding, and toughness and hardness decrease. In order to deoxidize the weld metal, it is preferable to add at least 0.2 of Si.
  • Mn 3.0 or less If Mn exceeds 3.0 mass%, hardness will fall. In order to deoxidize the weld metal, it is preferable to add at least 0.5 Mn.
  • Cr 1.0-15.0
  • the upper part self-fluxing alloy sprayed layer is fused, Cr is heated to the austenite region by receiving the fusing heat, and cooled after fusing, so that the structure changes from an austenite structure to a martensite structure. Hardness is improved.
  • the Cr content is less than 1% by mass, the above-described effects cannot be obtained.
  • the content of Cr exceeds 15% by mass, the austenite structure increases and the hardness greatly decreases.
  • the Cr content is 8.0% by mass or less. By limiting the Cr content to 8% by mass or less, a decrease in hardness due to an increase in the austenite structure can be sufficiently suppressed.
  • Ni 2.5-5.0 Ni
  • the fusing heat is received and the temperature is raised to the austenite region, and the structure is changed from the austenite structure to the martensite structure by cooling after fusing.
  • the Ni content exceeds 5% by mass, the hardness decreases.
  • the base overlay layer may further contain one or more of Mo, V, and Co. These contents can be, in mass%, Mo: 0.1 to 5.0, V: 0.1 to 3.0, and Co: 0.5 to 5.0.
  • Mo 0.1 to 5.0 Mo has the effect of increasing the high temperature hardness, but there is no effect if it is less than 0.1%. Even if added over 5.0%, the effect is saturated, and a remarkable hardness improvement effect cannot be expected.
  • V 0.1 to 3.0 V has the effect of increasing the high temperature hardness, but there is no effect if it is less than 0.1%. If it exceeds 3.0%, the effect is saturated, and a remarkable hardness improvement effect cannot be expected.
  • Co 0.5 to 5.0 Co has the effect of increasing the high temperature hardness, but there is no effect at 0.5% or less. If it is 5.0% or more, the effect is saturated and a significant improvement in hardness cannot be expected. Further, since Co is expensive, the upper limit is set to 5.0%.
  • the present invention will be described more specifically with reference to examples.
  • Table 1 the Shore hardness of the rolls having various compositions was examined. After spraying and fusing a predetermined sprayed material, the sprayed coating was removed by turning, and the hardness of the surface of the underlying overlay layer was measured with a Shore hardness meter.
  • the upper sprayed layer was formed by spraying a Ni-based self-fluxing alloy sprayed material in which carbide particles are dispersed by a gas flame spraying method. Moreover, the frequency

Abstract

ロールの胴部表面に下地肉盛層と、該下地肉盛層の上に炭化物粒子を分散した自溶合金溶射層を形成した熱延工場巻取り設備のロールであって、前記下地肉盛層は、ショア硬さが６０以上であり、質量％で、Ｃ：０．１～０．４、Ｓｉ：２．０以下、Ｍｎ：３．０以下、Ｃｒ：１．０～１５．０、Ｎｉ：２．５～５．０含有するＦｅベースの肉盛層からなることを特徴とする。前記下地肉盛層は、さらに、Ｍｏ、Ｖ及びＣｏのうち１種以上を含有し、質量％で、Ｍｏ：０．１～５．０、Ｖ：０．１～３．０、Ｃｏ：０．５～５．０である。

Description

熱延工場巻取り設備のロール
　本発明は、熱延工場巻取り設備のロールに関し、特にロール表面に被覆される被覆層の組成に関するものである。
　熱延工場巻取り設備に設けられるロールは、通板材との摺動および通板材突入時の衝撃により摩耗を引き起こすため、ロール表面に下地肉盛層を形成するとともに、この上に上地自溶合金溶射層を形成してロールを保護することが知られている（例えば、特許文献１乃至３参照）。
　特許文献１は、質量％で、Ｃ：０．１５％、Ｓｉ：０．４０％、Ｍｎ：１．８０％、Ｃｒ：３．０％、Ｍｏ：２．０％、Ｖ：０．８０％、Ｎｉ：２．０％、Ｃｏ：１．０％含み、残部がＦｅ及び不可避的不純物からなる下地肉盛層を開示する。特許文献２は、質量％で、Ｃ：０．２５％、Ｓｉ：０．５％、Ｍｎ：１．２％、Ｃｒ：１３．０％、Ｍｏ：０．７％、Ｎｉ：１．５％含み、残部がＦｅ及び不可避的不純物からなる下地肉盛層を開示する。特許文献３は、Ｃ：０．２６％、Ｓｉ：０．３２％、Ｍｎ：１．１３％、Ｃｒ：１３．３％、Ｍｏ：０．７４％、Ｎｉ：１．１６％含み、残部がＦｅ及び不可避的不純物からなる下地肉盛層を開示する。
特開昭５５－１４０７１０号公報 特開平８－１２１４６４号公報 特開平９－６７０５４号公報
　近年、熱延工場巻き取り通板材質の変化により（例えば、ハイカーボン材、高張力鋼板、厚板材の増加、縞板巻き取りロールへの適用などが考えられる）、下地肉盛層に要求される硬度が以前に増して向上している。しかしながら、上述の各特許文献に記載された下地肉盛層は、ショア硬さが５０以上で、６０に満たないため、通板時に板材が当接することにより、上地自溶合金溶射層に凹み、割れが発生する。
　また、近年、上地自溶合金溶射層に対して複数回のフュージング処理が実施される場合がある。本発明者等が、上述の各特許文献に記載された上地自溶合金溶射層に複数回のフュージング処理を実施したところ、下地肉盛層の硬さが大幅に低下してしまうことがわかった。
　そこで、本願発明は、上地自溶合金溶射層と、下地肉盛層とをロール表面に備えた熱延工場巻取り設備のロールにおいて、下地肉盛層のショア硬さを６０以上にすることを目的とする。
　上記課題を解決するために、本願発明に係る熱延工場巻取り設備のロールは、（１）ロールの胴部表面に下地肉盛層と、該下地肉盛層の上に炭化物粒子を分散した自溶合金溶射層を形成した熱延工場巻取り設備のロールであって、前記下地肉盛層は、ショア硬さが６０以上であり、質量％で、Ｃ：０．１～０．４、Ｓｉ：２．０以下、Ｍｎ：３．０以下、Ｃｒ：１．０～１５．０、Ｎｉ：２．５～５．０含有するＦｅベースの肉盛層からなることを特徴とする。
　（２）上記（１）の構成において、前記下地肉盛層は、さらに、Ｍｏ、Ｖ及びＣｏのうち１種以上を含有し、質量％で、Ｍｏ：０．１～５．０、Ｖ：０．１～３．０、Ｃｏ：０．５～５．０であってもよい。
　（３）上記（１）又は（２）の構成において、前記下地肉盛層は、前記自溶合金溶射層を複数回フュージングした場合であっても、ショア硬さが６０以上である。
　本願発明によれば、上地自溶合金溶射層と、下地肉盛層とをロール表面に備えた熱延工場巻取り設備のロールにおいて、下地肉盛層のショア硬さを６０以上にすることができる。
図１は、熱延工場巻取り設備の概略図である。
　図１は、熱延工場巻取り設備の概略図である。同図を参照して、熱延工場巻取り設備は、仕上げ圧延機にて定寸に圧延された４００～９００℃の高温鋼板１０を巻き取る複数のコイラー３および各コイラー３の前段に位置する上、下ピンチロール１、２を備える。これら複数のコイラー３および上、下ピンチロール１、２は、同一の圧延ラインに設けられる。
　コイラー３は、鋼板１０を巻き取るマンドレル４、およびマンドレル４の周囲に配置されて鋼板１０をマンドレル４に押し付ける複数のラッパーロール５を備える。上、下ピンチロール１、２は、仕上げ圧延機から搬送される鋼板１０を、斜め下方のコイラー３側に方向転換させて該コイラー３に巻き取らせるか、そのまま水平に搬送して下流側のコイラー３に巻き取らせる。上、下ピンチロール１、２は、コイラー３が鋼板１０を安定して巻き取れるように鋼板１０に後方への張力を付与する機能も有する。
　上述のピンチロール１、２及びラッパーロール５のロール胴部表面には下地肉盛層が形成されており、この下地肉盛層の上に炭化物粒子を分散した自溶合金溶射層が形成されている。なお、これらのピンチロール１、２及びラッパーロール５、つまり、熱延工場の巻き取り設備のロールに用いられるロール母材には、鉄系の金属を用いることができる。
　自溶合金溶射層には、例えば、ベース金属中に炭化物粒子が３～６０ｗｔ％分散含有された溶着合金を用いることができる。ベース金属には、Ｎｉ系の金属、Ｃｏ系の金属、Ｆｅ系の金属を用いることができる。炭化物粒子を３～６０ｗｔ％分散含有させることで、耐摩耗性が高まる。炭化物粒子の添加量が３ｗｔ％未満では、添加炭化物粒子の大きさ及び微小添加量との関係で、組織中の炭化物粒子分布が偏分布となりやすく、十分な耐摩耗性を確保することができない。
　また、炭化物粒子の添加量が６０ｗｔ％超になると、炭化物の歩留まり低下によるコスト高になるとともに、皮膜自体の靭性低下による製作過程での割れ発生、溶射層のフュージング不良を招くおそれがある。
　溶着合金に分散する炭化物には、ＷＣ、ＷｍＣｎ、Ｃｒ３Ｃ２、ＮｂＣ、ＶＣ、ＭｏＣ、ＴｉＣ、ＳｉＣの１種以上など、溶射材料として造粒可能な炭化物を使用することができる。これにベース金属としてのＮｉ系金属、Ｃｏ系金属、Ｆｅ系金属のいずれかを組み合わせることにより、各ロールの耐摩耗性、耐熱衝撃性、耐スリップ焼付の各特性を変化させることができる。その結果、熱延工場巻取り設備の条件に適合した材料を適宜選択することができる。
　上述の溶着合金にフュージング処理を施すことで、自溶合金溶射層が形成される。フュージング処理は、溶射パウダーの溶射後に、これを再加熱して、再溶融させる処理のことである。本実施形態の下地肉盛層は、このフュージング処理を複数回実施しても、ショア硬さ（Ｈｓ）が６０未満とならない。すなわち、上地の溶着合金をフュージングすると、下地肉盛層がその熱を受熱するが、特許文献１乃至３に開示された下地肉盛層では、下地肉盛層が複数回加熱されることで、ショア硬さ（Ｈｓ）が大きく低下する。一方、本実施形態の組成を満足する下地肉盛層では、フュージング処理の熱を受熱しても、ショア硬さ（Ｈｓ）が６０未満に低下しないため、上地自溶合金溶射層に凹み、割れが発生しにくくなる。
　すなわち、本実施形態の下地肉盛層は、ショア硬さが６０以上であり、質量％で、Ｃ：０．１～０．４、Ｓｉ：２．０以下、Ｍｎ：３．０以下、Ｃｒ：１．０～１５．０、Ｎｉ：２．５～５．０含有するＦｅベースの肉盛層からなる。以下、下地肉盛層の成分限定理由について説明する。
　Ｃ：０．１～０．４
　Ｃは、肉盛層の機械的強度、硬度を向上させるために必要である。しかしながら、０．４質量％を超えると、肉盛溶接時に割れが発生する。
　Ｓｉ：２．０以下
　Ｓｉは、２．０質量％を超えると、溶接時に割れが発生し、靭性及び硬度が低下する。なお、溶接金属を脱酸するためにＳｉは少なくとも０．２以上添加するのが好ましい。
　Ｍｎ：３．０以下
　Ｍｎは、３．０質量％を超えると、硬度が低下する。なお、溶接金属を脱酸するためにＭｎは少なくとも０．５以上添加するのが好ましい。
　Ｃｒ：１．０～１５．０
　Ｃｒは、上地自溶合金溶射層をフュージングした際に、そのフュージング熱を受熱してオーステナイト領域まで昇温され、フュージング後に冷却されることにより、組織がオーステナイト組織からマルテンサイト組織に変わるため、硬度が向上する。Ｃｒの含有量が１質量％未満になると、上述の効果が得られない。Ｃｒの含有量が１５質量％を超えると、オーステナイト組織が多くなり硬度が大きく低下する。好ましくは、Ｃｒの含有量は８．０質量％以下である。Ｃｒの含有量を８質量％以下に制限することにより、オーステナイト組織の増大による硬度低下を、十分に抑制することができる。
　Ｎｉ：２．５～５．０
　Ｎｉは、上地自溶合金溶射層をフュージングした際に、そのフュージング熱を受熱してオーステナイト領域まで昇温され、フュージング後に冷却されることにより、組織がオーステナイト組織からマルテンサイト組織に変わるが、硬度低下の原因となる恒温変態であるパーライトとベーナイト組織抑制効果があり、硬度が向上する。また、靱性を向上させる効果がある。しかしながら、Ｎｉの含有量が５質量％を超えると、硬度が低下する。
　前記下地肉盛層は、さらに、Ｍｏ、Ｖ及びＣｏのうち１種以上を含有していてもよい。これらの含有量は、質量％で、Ｍｏ：０．１～５．０、Ｖ：０．１～３．０、Ｃｏ：０．５～５．０とすることができる。
　Ｍｏ：０．１～５．０
　Ｍｏは高温硬度を増す効果があるが、０．１％未満だと効果がない。５．０％超添加しても、その効果は飽和し、著しい硬度向上効果が望めない。
　Ｖ：０．１～３．０
　Ｖは高温硬度を増す効果があるが、０．１％未満だと効果がない。３．０％超だとその効果は飽和し、著しい硬度向上効果が望めない。
　Ｃｏ：０．５～５．０
　Ｃｏは高温硬度を増す効果があるが、０．５％以下だと効果がない。５．０％以上だとその効果は飽和し、著しい硬度向上が望めない。またＣｏは高価であるため、上限値を５．０％とした。
　以下、実施例を示して、本発明についてより具体的に説明する。表１に示す通り、種々の組成からなるロールについてショア硬さを調べた。所定の溶射材料を溶射して、フュージングした後、溶射皮膜を旋削加工で取り除き、下地肉盛層表面の硬さをショア硬度計で測定した。上地溶射層は、炭化物粒子を分散したＮｉ基自溶合金溶射材料をガスフレーム溶射法で溶射することにより形成した。また、上地溶射層に対するフュージング処理の回数は３回とした。
　ショア硬さが６０以上であって、かつ、割れが発生しなかった場合には、合格として○で評価した。割れの有無に関わらず、ショア硬さが６０未満の場合には、不合格として×で評価した。ショア硬さの大小に関わらず、割れが発生した場合には、不合格として×で評価した。
Figure JPOXMLDOC01-appb-T000001
　さらに、実施例２、１７、１８、２２、比較例７、８について、フュージング回数を１回、２回、３回、４回、５回と変化させて、それぞれについてショア硬さを調べた。その試験結果を表２に示す。
Figure JPOXMLDOC01-appb-T000002
　比較例７，８はフュージング回数が増加するのに応じて、著しくショア硬さが低下した。比較例７では、フュージング回数が２回以上になるとショア硬さが６０未満に低下した。比較例８では、フュージング回数が３回以上になるとショア硬さが６０未満に低下した。一方、本発明の実施例２、１７、１８、２２はフュージング回数の増加によるショア硬さの低下量が小さく、フュージング回数が５回に達しても、６０以上のショア硬さを確保することができた。

Claims (3)

  1. 　ロールの胴部表面に下地肉盛層と、該下地肉盛層の上に炭化物粒子を分散した自溶合金溶射層を形成した熱延工場巻取り設備のロールであって、
    　前記下地肉盛層は、ショア硬さが６０以上であり、質量％で、Ｃ：０．１～０．４、Ｓｉ：２．０以下、Ｍｎ：３．０以下、Ｃｒ：１．０～１５．０、Ｎｉ：２．５～５．０含有するＦｅベースの肉盛層からなることを特徴とする熱延工場巻取り設備のロール。
  2. 　前記下地肉盛層は、さらに、Ｍｏ、Ｖ及びＣｏのうち１種以上を含有し、質量％で、Ｍｏ：０．１～５．０、Ｖ：０．１～３．０、Ｃｏ：０．５～５．０であることを特徴とする請求項１に記載の熱延工場巻取り設備のロール。
  3. 　前記下地肉盛層は、前記自溶合金溶射層を複数回フュージングした場合であっても、
    ショア硬さが６０以上であることを特徴とする請求項１又は２に記載の熱延工場巻取り設備のロール。
     
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