WO2021194437A1 - Rouleau multicouche à haute résistance à la corrosion - Google Patents

Rouleau multicouche à haute résistance à la corrosion Download PDF

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Publication number
WO2021194437A1
WO2021194437A1 PCT/TR2020/050249 TR2020050249W WO2021194437A1 WO 2021194437 A1 WO2021194437 A1 WO 2021194437A1 TR 2020050249 W TR2020050249 W TR 2020050249W WO 2021194437 A1 WO2021194437 A1 WO 2021194437A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
outer layer
layer
corrosion resistance
inner layer
Prior art date
Application number
PCT/TR2020/050249
Other languages
English (en)
Inventor
Mehmet OKTAY
Efe TASCI
Original Assignee
Entil Endustri Yatirimlari Ve Ticaret Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Entil Endustri Yatirimlari Ve Ticaret Anonim Sirketi filed Critical Entil Endustri Yatirimlari Ve Ticaret Anonim Sirketi
Priority to EP20927761.5A priority Critical patent/EP4126417A1/fr
Publication of WO2021194437A1 publication Critical patent/WO2021194437A1/fr

Links

Classifications

    • 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
    • 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
    • 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
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/003—Cementite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/006—Graphite

Definitions

  • the present invention relates to a new roller structure and alloy that allow rolls obtained by centrifugal casting to be produced with high corrosion and high abrasion resistance.
  • the present invention relates to a multi-layered roller structure which includes an intermediate layer for that the inner layer adapts to the high chromium containing composition of the outer layer for high corrosion resistance, and rolls material compositions thereof.
  • Centrifugal casting called as spin casting has many advantages including homogeneous hardness and thickness, long life, less abrasion and less service cost compared to static casting.
  • Rolling mills perform the function of the rollers which are significant elements at the important production facilities in the field of food such as pellet feed, oil, chocolate, coffee, in very different working environments compared to the sector. The corrosion they are exposed due to the need of the environment in the sector they are used, shortens greatly the life of the conventional rollers compared to the normal working conditions. Therefore, the rollers produced by the existing techniques cannot be used in the high corrosive environment.
  • iron-based alloys are preferred in the rollers produced todays.
  • the use of high alloyed white cast irons becomes crucial especially in the production of hard surfaces requiring high abrasion resistance.
  • the chromium element provides a high corrosion resistance and abrasion resistance to the roller made of alloy where it is included in.
  • high rate of chromium should be preferred for alloying the roller.
  • the microstructure of these materials is mainly perlite-cementite, and it contains significant amount of M7C3 type chromium carbide. These types of carbides are found within the eutectic structures.
  • the currently produced rollers consist of two layers. They comprises an outer layer which has the above-mentioned abrasion and corrosion resistance and is formed in a vertical or horizontal centrifugal mold. After said outer layer is formed, there is an inner layer that allows a shaft to be driven in it by filling the space within the outer layer. Therefore, in the current technique, a roller consists of two layers with different physical expectations as being an inner layer and an outer layer.
  • the presence of high amount of Chromium within the outer layer alloy for higher corrosion resistance of a roller produced in this structure prevents its usage with the prior inner layer alloys. In the other words, when it is desired to increase the corrosion resistance more, the outer and inner layer alloys used in the production of current roller show incompatibility and, significant deformations and cracks occur after production and they cause the roller to become unusable in a short time.
  • the roller surface material In the patent document EP2770073B1, a roller surface material produced by centrifugal casting is mentioned.
  • the roller surface material consists of the following elements and a composition in the specified proportions: 2.3 - 2.9% C, 0.2 - 0.8% Si, 0.2 - 1.0% Mn, 5.0 - 7.5% Cr, 4.4 - 6.5% Mo, 5.3 - 7.0% V, 0.6 - 1.5% Nb and 0.1 - 4.0% Co. It is claimed that the fatigue resistance of the surface layer is increased in this way.
  • the roller’s outer layer material consists of the following elements and a composition in the specified proportions by weight: 2.2 - 3.2% C, 10 - 3.0% Si, 0.3 - 2.0% Mn, 3.0 - 7.0% Ni, 0.5 - 2.5% Cr, 1.0 - 3.0% Mo, 2.5 - 5.0% V, 0 - 0.5% Nb and a remaining portion containing Fe and inevitable impurities.
  • the aim of the invention is to present a multi-layered roller with high corrosion and high abrasion resistance.
  • Another aim of this invention is to present a three-layered roller increasing the corrosion resistance to the highest levels by containing a high rate of chromium (Cr) in the rollers produced by centrifugal casting method and hence, comprising an intermediate layer which provides a seamless combination of the inner layer with high carbon level at different technical properties with the outer layer without any cracking or physical deformation.
  • Cr chromium
  • Another aim of this invention is to present a three-layered roller which comprises an outer layer containing 15 - 20% Cr and 0.5 - 1.5% C by weight, an inner layer containing 0 - 0.5% Cr and 2.5 - 3% C by weight and an intermediate layer containing 0 - 1% Cr and 0.5 - 1.5% C by weight between them.
  • Present invention is a multi-layered roller (1) with high hardness levels and high corrosion resistance by means of the centrifugal casting method.
  • rollers (1) comprise an outer layer (10) obtained by centrifugal casting process at the desired hardness values in accordance with the field of usage, and an inner layer (30) which is obtained from a different alloy and in which ultimately the shaft is driven in.
  • an outer layer (10) obtained by centrifugal casting process at the desired hardness values in accordance with the field of usage
  • an inner layer (30) which is obtained from a different alloy and in which ultimately the shaft is driven in.
  • This present invention comprises an intermediate layer (20) between the outer layer (10) and the inner layer (30) to solve this technical problem.
  • the hardness values desired from the outer layer (10) of the roller (1) are between 500 - 550 HB. important researches have been carried out in order to reach this hardness value without any problem and to present a roller (1) with high corrosion resistance values and thus to reveal the present invention.
  • high alloyed white cast irons are preferred in the production of these hard surfaces that are expected to have high abrasion resistance.
  • the chromium element gives to the structure a high corrosion resistance and a high abrasion resistance, the chromium ratio has been kept high in the outer layer (10) of the present invention.
  • keeping the chromium ratio too high causes incompatibility with the inner layer and cracks during firing process for driving the shaft in.
  • a high carbon ratio in addition to the high chromium ratio can cause cracks in the outer layer (10) of the roller (1). Therefore, an optimization is required between the chromium and carbon ratios in the compositions that will be used in the production of the outer layer (10).
  • the outer layer (10) Besides, for the outer layer (10) to reach the desired hardness values, it must be subjected to heat treatment process after casting. During a destabilization heat treatment, austenite in the matrix turns into martensite. However, in this case, the accumulated energy in the roller (1) can become even more dangerous and finally the roller (1) may crack along the outer surface during application of heat treatment process.
  • the inner layer In research, GG25 lamellar graphite cast iron, and in another research, the spherical graphite cast iron in the GGG40 alloy were use as the inner layer, however the compatibility with the outer layer was not achieved in both cases.
  • the outer layer (10) composition of the present innovative roller (1) achieves the targeted technical properties as a result of using the following elements at a certain intervals. Accordingly, the outer layer (10) composition contains by weight: 0,5 - 1,50% C, 0 - 1% Si, 0 - 1% Mn, 15 - 20% Cr, 0 - 1% Mo and 0 - 1% Ni. These rates can be expressed in a table as follows:
  • the roller obtained as a result of casting was taken for rough machining process before it is sent to heat treatment. After rough machining process was completed, the hardness value was taken from the roller. In a casting carried out under normal conditions, 270 HB hardness values can be obtained at maximum.
  • the hardness values obtained by the centrifugal casting process used in the present invention vary between 360 - 400 HB. However, on the other hand, the hardness values expected from the roller (1) are between 500 - 550 HB. In order to achieve this, heat treatment, quenching and tempering processes were applied on the roller (1) and, the desired hardness values were reached in the present innovative roller (1).
  • the outer layer (10) obtained by the centrifugal casting process is a hard layer exposed to corrosion and abrasion, it can have an average thickness of 30 mm from the outer surface of the mold; if required to give a value in terms of sampling.
  • the transition zone between these two materials (outer layer (10) and inner layer (30)) is the point where these two metals are connected to each other.
  • applications done with these two metals (bimetallic) were insufficient.
  • the number of casting layers has been increased to solve this technical problem.
  • An outer layer (10), an inner layer (30) and an intermediate layer (20) in order to form the transition region between these two layers and to eliminate the incompatibility problem between them and consequently the cracking problems, are formed in a preferred embodiment of the present innovative roller (1).
  • the chemical composition of mentioned intermediate layer (20) contains by weight: 1 - 2% C, 0 - 1% Si, 0 - 1% Mn, 0 - 1% Cr, 1 - 3% Mo and 1 - 3% Ni. These rates can be expressed in a table as follows:
  • the intermediate layer (20) has been formed with the specified inner layer (30) composition without the need for changing the outer layer (10) and inner layer (30) compositions described above and, the present innovative multi-layered roller (1) was obtained without any cracking in the final result achieved. After both rough machining, heat treatment stages and shaft driving process, the present innovative roller (1) could be produced at the expected hardness values and corrosion resistance without any problem.
  • a roller (1) which, comprising an outer layer (10) made of stainless steel and an inner layer (30) made of cast iron, has a high corrosion resistance and is produced by the centrifugal casting method, and comprises an outer layer (10) containing 15 - 20% Cr and 0.5 - 1.5% C by weight, an inner layer (30) containing 0 - 1% Cr and 2.5 - 3.5% C by weight and an intermediate layer (20) containing 0 - 1% Cr and 1 - 2% C by weight between them.
  • mentioned inner layer (30) contains the following chemical composition by weight: 2,5 - 3,5% C, 2 - 2,5% Si, 0 - 1% Mn, 0 - 1% Cr, 0 - 1% Mo and 0 - 1% Ni. These rates can be expressed in a table as follows:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

La présente invention concerne une structure de rouleau multicouche qui comprend une couche intermédiaire pour que la couche interne s'adapte à une composition à haute teneur en chrome de la couche externe pour une résistance à la corrosion élevée, et des compositions de matériau de rouleau associées.
PCT/TR2020/050249 2020-03-26 2020-03-29 Rouleau multicouche à haute résistance à la corrosion WO2021194437A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20927761.5A EP4126417A1 (fr) 2020-03-26 2020-03-29 Rouleau multicouche à haute résistance à la corrosion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2020/04781A TR202004781A1 (tr) 2020-03-26 2020-03-26 Yüksek korozyon di̇renci̇ne sahi̇p çok katmanli vals topu
TR2020/04781 2020-03-26

Publications (1)

Publication Number Publication Date
WO2021194437A1 true WO2021194437A1 (fr) 2021-09-30

Family

ID=77892590

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2020/050249 WO2021194437A1 (fr) 2020-03-26 2020-03-29 Rouleau multicouche à haute résistance à la corrosion

Country Status (3)

Country Link
EP (1) EP4126417A1 (fr)
TR (1) TR202004781A1 (fr)
WO (1) WO2021194437A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114367538A (zh) * 2021-12-23 2022-04-19 中钢集团邢台机械轧辊有限公司 一种平整机的工作辊及其制造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013057914A1 (fr) * 2011-10-19 2013-04-25 Ｊｆｅスチール株式会社 Matériau de couche superficielle de rouleau destiné à effectuer un laminage à chaud et qui présente une excellente résistance à la fatigue et est produit par une coulée par centrifugation, et rouleau composite pour un laminage à chaud produit au moyen d'une coulée par centrifugation
WO2013077377A1 (fr) * 2011-11-21 2013-05-30 日立金属株式会社 Rouleau de laminoir composite coulé de façon centrifuge et son procédé de fabrication
WO2013150950A1 (fr) * 2012-04-02 2013-10-10 日立金属株式会社 Rouleau composite obtenu par moulage centrifuge et procédé pour sa fabrication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013057914A1 (fr) * 2011-10-19 2013-04-25 Ｊｆｅスチール株式会社 Matériau de couche superficielle de rouleau destiné à effectuer un laminage à chaud et qui présente une excellente résistance à la fatigue et est produit par une coulée par centrifugation, et rouleau composite pour un laminage à chaud produit au moyen d'une coulée par centrifugation
WO2013077377A1 (fr) * 2011-11-21 2013-05-30 日立金属株式会社 Rouleau de laminoir composite coulé de façon centrifuge et son procédé de fabrication
WO2013150950A1 (fr) * 2012-04-02 2013-10-10 日立金属株式会社 Rouleau composite obtenu par moulage centrifuge et procédé pour sa fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114367538A (zh) * 2021-12-23 2022-04-19 中钢集团邢台机械轧辊有限公司 一种平整机的工作辊及其制造方法

Also Published As

Publication number Publication date
TR202004781A1 (tr) 2021-10-21
EP4126417A1 (fr) 2023-02-08

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