EP3895818B1 - Work roll for rolling, rolling machine equipped with same, and rolling method - Google Patents

Work roll for rolling, rolling machine equipped with same, and rolling method Download PDF

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Publication number
EP3895818B1
EP3895818B1 EP19895432.3A EP19895432A EP3895818B1 EP 3895818 B1 EP3895818 B1 EP 3895818B1 EP 19895432 A EP19895432 A EP 19895432A EP 3895818 B1 EP3895818 B1 EP 3895818B1
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EP
European Patent Office
Prior art keywords
rolling
roll
case
skin pass
surface roughness
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Active
Application number
EP19895432.3A
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German (de)
English (en)
French (fr)
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EP3895818A1 (en
EP3895818A4 (en
Inventor
Masayasu Ueno
Takuro Yazaki
Hideo Kijima
Masaru Miyake
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JFE Steel Corp
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JFE Steel Corp
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Publication date
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Publication of EP3895818A4 publication Critical patent/EP3895818A4/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/032—Rolls for sheets or strips
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/615—Microstructure of the layers, e.g. mixed structure
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/625—Discontinuous layers, e.g. microcracked layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/18—Elongation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/28—Elastic moduli of rolls
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium

Definitions

  • the present invention relates to a rolling work roll for rolling a high-strength steel strip and a rolling mill having the roll, and a rolling method.
  • a skin pass rolling mill with which soft reduction is performed on a steel strip with a rolling reduction ratio of, for example, 1% or less, is known.
  • a steel strip is homogeneously elongated by the skin pass rolling mill so that the shape of the steel strip is corrected to obtain predetermined flatness.
  • the properties of the steel strip such as mechanical properties, such as yield point elongation, tensile strength, and elongation, and surface roughness, are improved by performing skin pass rolling.
  • mechanical properties such as yield point elongation, tensile strength, and elongation, and surface roughness
  • a hard steel strip typified by a high-tensile-strength steel strip.
  • a significantly high rolling load is necessary to achieve an elongation ratio required for shape correction.
  • Patent Literature 1 discloses a method in which skin pass rolling is performed by using a work roll having a surface average roughness Ra of 3.0 ⁇ m to 10.0 ⁇ m.
  • Patent Literature 2 which forms the basis for the preamble of claim 1, discloses a method utilizing a cemented carbide which consists of tungsten carbide (WC) and cobalt (Co) and whose surface layer has a Young's modulus of 500 GPa or higher as a roll material.
  • Patent Literature 3 discloses a method in which skin pass rolling is performed by using a roll whose surface layer has a Young's modulus of 450 GPa or higher and whose surface roughness Ra is 1 ⁇ m or more and 10 ⁇ m or less.
  • the surface of a rolling work roll has a predetermined arithmetic average roughness which is obtained by performing dull texturing process.
  • dull texturing process for example, a shot blasting processing method or a discharge dull texturing process is used as described in Patent Literature 1.
  • a problem such as a decrease in surface roughness due to abrasion or crack growth with an increase in rolling distance.
  • there is a problem in that it is necessary, for example, to repair or replace a rolling work roll due to the above problem occurring in the rolling work roll, which makes it difficult to stably perform a rolling operation.
  • An object of the present invention is to provide a rolling work roll with which it is possible to stably perform a rolling operation when skin pass rolling is performed on a high-strength steel strip and a rolling mill having the roll, and a rolling method.
  • the present invention has the features to solve the problems as described in the appended claims.
  • Fig. 1 is a schematic diagram illustrating a preferable embodiment of a rolling mill 10 having rolling work rolls according to the present invention.
  • the rolling mill 10 in Fig. 1 is used for performing skin pass rolling on a wide steel strip having a tensile strength of, for example, 980 MPa or higher.
  • the skin pass rolling mill 10 has a pair of rolling work rolls 2 and back-up rolls 3, each of which supports a corresponding one of the rolling work rolls 2.
  • a payoff reel 5 is arranged upstream of the skin pass rolling mill 10, and a tension reel 6 is arranged downstream of the skin pass rolling mill 10.
  • bridle rolls may be arranged upstream or downstream of the skin pass rolling mill 10 to apply tension to the steel strip 1.
  • the rolling work roll 2 has a structure in which a roll barrel 2x made of a cemented carbide is fixed to, for example, a shaft.
  • the roll barrel 2x is made of a cemented carbide which has a Young's modulus of 450 GPa or higher and which contains, for example, by mass%, 86% tungsten carbide (WC) and a balance of cobalt (Co).
  • Young's modulus is 450 GPa or higher, it is possible to prevent an increase in the contact arc length in a roll bite between the rolling work rolls 2 and the steel strip 1 due to the flattening deformation of the rolling work rolls 2 and to thereby prevent an excessive increase in rolling load acting on the rolling work rolls 2, even when skin pass rolling is performed on a high-strength steel sheet.
  • a recess and projection layer 2y containing granular Cr is formed in the part corresponding to the roll barrel surface of the roll barrel 2x.
  • the recessed and projected shape including the surface morphology is formed by performing chromium plating and thereby precipitating granular chromium so that an arithmetic average roughness (hereinafter, referred to as "surface roughness") Ra of 2.0 ⁇ m to 10.0 ⁇ m is obtained.
  • surface roughness arithmetic average roughness
  • the surface roughness Ra of the rolling work rolls 2 be 3.0 ⁇ m or more to realize the elongation effect.
  • the surface roughness Ra of the recess and projection layer 2y be more than 4.0 ⁇ m.
  • the surface roughness Ra of the recess and projection layer 2y not be more than 10.0 ⁇ m from the viewpoint of not only extreme difficulty in stably forming large surface roughness on the rolling work rolls 2 in industrial processes but also roll service life. Therefore, it is preferable that the surface roughness Ra of the work rolls be 10.0 ⁇ m or less.
  • This recess and projection layer 2y is formed of granular Cr, which is precipitated by performing a chromium plating treatment.
  • a chromium plating treatment which is performed to improve the adhesiveness between the surface of the roll barrel 2x and a chromium coating layer
  • the polished surface is subjected to, for example, a sand blasting treatment so as to have a surface roughness Ra of 0.8 ⁇ m.
  • the surface of the roll barrel 2x is subjected to a washing treatment followed by a chromium plating treatment.
  • the chromium plating treatment is performed, for example, under the conditions of a low plating bath temperature of 50°C or lower and a high current density of 60 A/dm 2 or more. With this, it is possible to increase the diameter of Cr crystal grains which are precipitated on the surface of the roll barrel 2x. That is, in the case of an industrially used hard chromium coating layer, the morphology and hardness of Cr precipitated vary depending on electroplating conditions (plating bath temperature, current density, and plating time).
  • the treatment is performed under the conditions of a plating bath temperature of about 50°C to 60°C and a current density of about 40 A/dm 2 to 60 A/dm 2 to obtain a flat and smooth surface.
  • a plating bath temperature of about 50°C to 60°C and a current density of about 40 A/dm 2 to 60 A/dm 2
  • plating is performed under the conditions of a low plating bath temperature of 50°C or lower and a high current density of 60 A/dm 2 or more to precipitate granular Cr.
  • Fig. 2 is an enlarged surface photograph illustrating an example of the recess and projection layer of the rolling work roll in the skin pass rolling mill in Fig. 1 .
  • chromium plating was performed in a plating solution containing chromic acid (CrO 3 ) and sulfuric acid (H 2 SO 4 ) under the conditions of a plating bath temperature of 37°C, a current density of 120 A/dm 2 , and a plating time of 150 min.
  • a granular recess and projection layer 2y was formed on the surface of the roll barrel 2x through the precipitation of Cr.
  • the surface roughness Ra was determined by using a contact-type roughness meter, the surface roughness Ra was 3.9 ⁇ m.
  • no crack or the like occurred in the recess and projection layer 2y.
  • the surface roughness Ra of the recess and projection layer 2y is controlled by controlling plating time.
  • Fig. 3 is a graph illustrating the variation in surface roughness Ra after the plating when only a plating time is varied under the plating conditions for Fig. 2 . Since there is an increase in surface roughness Ra with an increase in plating time, it is possible to achieve desired surface roughness Ra by controlling the plating conditions.
  • the average grain diameter of Cr precipitated on the roll surface by performing chromium plating be 50 ⁇ m or more. This is for the purpose of effectively realizing an elongation effect due to the indentation of the recessed and projected shape onto the steel sheet surface.
  • a rolling experiment was performed to clarify the effect of decreasing a rolling load due to rolling work rolls 2 having the recess and projection layer 2y described above.
  • a high-tensile-strength steel sheet having a thickness of 0.215 mm, a width of 20 mm, a length of 200 mm, and a yield stress of 1500 MPa was used as a sample material.
  • a 4-high rolling mill having work rolls having a diameter of ⁇ 70 mm was used as a skin pass rolling mill 10 to perform cut-sheet rolling without tension under a dry condition without a lubricant. This was a 1/7-scale model experiment for a roll diameter and a sheet thickness used in practical rolling performed on a high-tensile-strength steel sheet for an automobile.
  • the roll barrel 2x was made of 2%-Cr steel having a Young's modulus of 206 GPa, and the surface thereof was subjected to grindstone polishing to obtain a surface roughness Ra of 0.2 ⁇ m.
  • the roll barrel 2x was made of 2%-Cr steel, and the surface thereof was subjected to discharge dull texturing process to obtain a surface roughness Ra of 3.0 ⁇ m.
  • conventional example 2 No.
  • the roll barrel 2x was made of a cemented carbide containing, by mass%, 86% tungsten carbide (WC) and a balance of cobalt and having a Young's modulus of 503 GPa. The surface thereof was subjected to grindstone polishing to obtain a surface roughness Ra of 0.2 ⁇ m.
  • the roll barrel 2x was made of the same cemented carbide as in the case of conventional example 2 (No. 3), and the surface thereof was subjected to chromium plating for dull texturing process to form the recess and projection layer 2y having a surface roughness Ra of 2.5 ⁇ m.
  • Fig. 4 is a graph illustrating the variation in load per unit width with respect to an elongation ratio in the case of conventional examples 1 and 2, comparative example 1, and example 1.
  • the load per unit width of conventional example 1 (No. 2) in which the surface roughness is large, is lower than that of comparative example 1, which indicates that the elongation effect due to the indentation of the projected portions of the surface of the rolling work rolls onto the surface of the steel sheet was realized.
  • elongation ratio denotes the ratio of a change in the length in the longitudinal direction of a steel strip before and after rolling to the original length.
  • the elongation ratio is 0.2% or more, since it is possible to sufficiently correct the shape of a steel strip, even if it is a high-strength cold-rolled steel strip, it is possible to achieve generally good flatness on the front and back surface sides of the steel strip.
  • the elongation ratio applied to a steel strip be 0.5% or less to control the rolling load acting on the work rolls and the skin pass rolling mill 10 to be within the load capacity of the skin pass rolling mill.
  • the roll barrel 2x was made of a cemented carbide (having a Young's modulus of 503 GPa) containing, by mass%, 86% tungsten carbide (WC) and a balance of cobalt, and the surface thereof was subjected to direct discharge dull texturing process to obtain a surface roughness Ra of 3.0 ⁇ m.
  • Fig. 5 is an enlarged surface photograph illustrating the surface of the recess and projection layer in the case where the roll barrel 2x made of a cemented carbide was subjected to dull texturing process by performing direct discharge processing as in the case of comparative example 2.
  • a crack CK occurred on the surface due to the impact when discharge processing was performed.
  • a crack CK occurs in the case where a material such as a cemented carbide which contains mainly ceramics that is a brittle material is subjected to discharge processing.
  • the roll barrel 2x was made of a cemented carbide (having a Young's modulus of 503 GPa) containing, by mass%, 86% tungsten carbide (WC) and a balance of cobalt, and the surface thereof was subjected to chromium plating to form the recess and projection layer 2y having a surface roughness Ra of 3.0 ⁇ m.
  • the roll barrel 2x was made of 2%-Cr steel having a Young's modulus of 206 GPa, and the surface thereof was subjected to discharge dull texturing process to obtain a surface roughness Ra of 4.5 ⁇ m.
  • the roll barrel 2x was made of a cemented carbide (having a Young's modulus of 450 GPa) containing, by mass%, 80% tungsten carbide (WC) and a balance of cobalt, and the surface thereof was subjected to discharge dull texturing process to obtain a surface roughness Ra of 4.5 ⁇ m without performing chromium plating.
  • the roll barrel 2x was made of a cemented carbide (having a Young's modulus of 450 GPa) containing, by mass%, 80% tungsten carbide (WC) and a balance of cobalt, and the surface thereof was subjected to chromium plating to form the recess and projection layer 2y having a surface roughness of 4.5 ⁇ m.
  • the average grain diameter of Cr precipitated was 60 ⁇ m.
  • a hard chromium coating layer having a thickness of 1 ⁇ m was further formed on the roll surface under alternate plating conditions.
  • the reason why the additional hard chromium coating layer was formed under alternate plating conditions is as follows. In the case where a recessed and projected shape is formed by precipitating granular Cr on the surface of the roll under the plating conditions of a low plating bath temperature of 50°C or lower and a high current density of 60 A/dm 2 , the Vickers hardness of the chromium coating layer is about 700 to 900.
  • the Vickers hardness of the hard chromium coating layer is about 900 to 1100.
  • the reason why a hard chromium coating layer was further formed under alternate plating conditions after granular Cr had been precipitated on the roll surface by using the same method as that in the case of example 3 is because, since a significantly hard coating layer is formed on the outermost surface of the rolling work roll, there is a further improvement in abrasion resistance.
  • the thickness of the additional hard chromium coating layer is set to be 1 ⁇ m as described above is because, in the case where the thickness is equal to or more than that, since there is a decrease in the height difference in the recessed and projected shape formed by grains in the early stage, there is a decreased elongation effect when skin pass rolling is performed. That is, by forming an additional thin hard chromium coating layer on the granular chromium precipitated in the early stage of the plating process, it is possible to increase the hardness of the surface of the coating layer without changing the roughness pattern formed of granular chromium. Here, for such a reason, it is preferable that the thickness of the additional hard chromium coating layer be 0.5 ⁇ m to 10 ⁇ m.
  • Fig. 6 is a graph illustrating the variation in surface roughness with respect to a rolling distance when a rolling experiment is performed by using the rolling work rolls given in Table 3.
  • Fig. 6 it is clarified that, in the case of comparative example 3 where 2%-Cr steel roll was subjected to discharge dull texturing process, there is a significant decrease in roughness with an increase in rolling distance.
  • comparative example 4 where a cemented carbide was subjected to direct discharge dull texturing process to obtain high roughness, since the hardness of the cemented carbide is significantly high, the best roll roughness retainability with respect to the rolling distance was achieved.
  • fracturing occurred in the roll surface after a rolling distance of 1.67 km, it was difficult to further continue rolling. This is because, as described above, in the case where a cemented carbide is subjected to direct discharge processing, a crack occurs and grows due to stress applied when rolling is performed, which makes it difficult to use such a roll in practical rolling.
  • the recess and projection layer 2y which is formed on the outer peripheral surface of the roll barrel 2x, which has a surface roughness Ra of 2.0 ⁇ m to 10.0 ⁇ m, and which is formed of granular chromium, since it is possible to inhibit a decrease in surface roughness Ra due to abrasion and a deterioration in work roll properties due to, for example, the occurrence of a crack, even when there is an increase in rolling distance, it is possible to stably perform skin pass rolling.
  • the shape (flatness) of the steel strip is likely to be deteriorated due to thermal stress generated when quenching is performed and due to transformation stress generated when transformation occurs in a metallographic structure. It is not possible to eliminate such a shape defect of a steel strip even if shape correction of the steel strip is tried when cold rolling is performed before annealing is performed. Therefore, it is necessary to perform shape correction by performing skin pass rolling on the steel strip after annealing has been performed.
  • a high-tensile-strength steel sheet having a tensile strength of 980 MPa or higher is used as a raw material for automobile parts, which are obtained by performing press forming on the steel sheet.
  • the surface of the steel sheet is subjected to dull texturing process (recessed and projected processing).
  • the dull texturing process of the surface of the steel strip 1 the surface condition of the steel strip is controlled by printing the recessed and projected shape of the rolling work rolls 2 of the skin pass rolling mill 10 onto the surface of the steel sheet, where the recessed and projected shape of the rolling work rolls are ordinarily prepared by performing dull texturing process in advance.
  • the elongation ratio is controlled by applying tension to the steel strip and by setting a work roll gap when skin pass rolling is performed.
  • a tension and a rolling load higher than conventional ones are necessary.
  • the roll barrel 2x is made of a cemented carbide having a Young's modulus of 450 GPa or higher. With this, even when rolling is performed on a high-tensile-strength steel sheet having a tensile strength of 980 MPa or higher, it is possible to achieve the desired load per unit width without increasing roll diameter.
  • the recess and projection layer 2y is formed of granular chromium, which is precipitated by performing a chromium plating. With this, it is possible not only to form the recess and projection layer 2y without a crack but also to achieve a Vickers hardness with which the abrasion is less likely to occur in the surface, even when rolling is repeated.
  • the recess and projection layer 2y is formed of granular chromium, since the projected portion of the granular chromium has a spherical shape, there is a decreased local stress concentration during rolling, which results in an increase in abrasion resistance compared with the case of an ordinary chromium coating layer. As a result, since there is a decrease in the frequency of the repair and replacement of the work rolls, it is possible to stably operate a rolling process.
  • a technique of the present invention is applied to a stand-alone skin pass rolling mill illustrated in Fig. 4
  • the technique of the present invention may be applied to rolling mills which are installed as in-line rolling mills in continuous process lines such as a continuous annealing line (CAL) and a continuous galvanizing line (CGL).
  • CAL continuous annealing line
  • CGL continuous galvanizing line

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
  • Electroplating Methods And Accessories (AREA)
EP19895432.3A 2018-12-12 2019-10-25 Work roll for rolling, rolling machine equipped with same, and rolling method Active EP3895818B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018232080 2018-12-12
PCT/JP2019/041848 WO2020121657A1 (ja) 2018-12-12 2019-10-25 圧延用ワークロールおよびこれを備えた圧延機ならびに圧延方法

Publications (3)

Publication Number Publication Date
EP3895818A1 EP3895818A1 (en) 2021-10-20
EP3895818A4 EP3895818A4 (en) 2022-01-26
EP3895818B1 true EP3895818B1 (en) 2023-03-08

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EP19895432.3A Active EP3895818B1 (en) 2018-12-12 2019-10-25 Work roll for rolling, rolling machine equipped with same, and rolling method

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EP (1) EP3895818B1 (ja)
JP (1) JP6680426B1 (ja)
CN (1) CN113195123B (ja)
MX (1) MX2021007044A (ja)
WO (1) WO2020121657A1 (ja)

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JP7338604B2 (ja) * 2020-10-27 2023-09-05 Ｊｆｅスチール株式会社 冷延鋼板の製造方法

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CN105127203A (zh) * 2015-10-10 2015-12-09 上海通乐冶金设备工程有限公司 一种冷轧平整机抛丸毛化镀铬工作辊及其制作工艺
JP2017100149A (ja) * 2015-11-30 2017-06-08 Ｊｆｅスチール株式会社 超硬合金ワークロールおよびその運用方法
JP6428731B2 (ja) 2015-12-28 2018-11-28 Ｊｆｅスチール株式会社 調質圧延機及び調質圧延方法
CN207043019U (zh) * 2017-06-30 2018-02-27 河源正信硬质合金有限公司 硬质合金轧辊

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EP3895818A4 (en) 2022-01-26
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CN113195123A (zh) 2021-07-30
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