EP0672761B1 - Bandes en acier laminées à froid - Google Patents

Bandes en acier laminées à froid Download PDF

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Publication number
EP0672761B1
EP0672761B1 EP19950100236 EP95100236A EP0672761B1 EP 0672761 B1 EP0672761 B1 EP 0672761B1 EP 19950100236 EP19950100236 EP 19950100236 EP 95100236 A EP95100236 A EP 95100236A EP 0672761 B1 EP0672761 B1 EP 0672761B1
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EP
European Patent Office
Prior art keywords
steel
cold rolled
steel alloy
strips
alloy contains
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950100236
Other languages
German (de)
English (en)
Other versions
EP0672761A2 (fr
EP0672761A3 (fr
Inventor
Daniel Krzysztalowicz
Karl-Erik Lidh
Lars-Ake NORSTRÖM
Börje Johansson
Stig Pettersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine Precision Strip AB
Original Assignee
Uddeholms AB
Voestalpine Precision Strip AB
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Filing date
Publication date
Application filed by Uddeholms AB, Voestalpine Precision Strip AB filed Critical Uddeholms AB
Publication of EP0672761A2 publication Critical patent/EP0672761A2/fr
Publication of EP0672761A3 publication Critical patent/EP0672761A3/fr
Application granted granted Critical
Publication of EP0672761B1 publication Critical patent/EP0672761B1/fr
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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
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Definitions

  • the invention relates to cold rolled, 0.05 - 1.00 mm thick, hardened strips suitable as material for the manufacturing of coater and doctor blades, wherein the strips are made of a steel having a specific alloy composition.
  • coater blades in the shape of thin, long blades are used for coating the paper web with a coating slip. These blades are pressed against the moving paper web, usually with back pressure provided by a counter roll, or by a blade, on the opposite side of the paper web, when two-sided coating is performed. To provide even and top quality coating the coater blade must be straight. The normal specification is that the machined edge of the coater blade must not deviate more than 0.3 mm/3,000 mm coater blade length, from complete straightness. To satisfy this requirement it is be necessary to select a steel alloy which prevents the strips from deforming during hardening and tempering, if the steel strips must undergo these processes.
  • alloy steels provide more problems in this respect than non-alloy steels, and this is particularly true for steel alloys which contain several different interacting alloying elements.
  • the most common material in coater blades is consequently still carbon steel, for example the steel with the trade mark UHB20C, which has the principal analysis 1.00 C, 0.30 Si, 0.40 Mn, 0.15 Cr, and the remainder iron and contaminants in normal proportions.
  • Martensite stainless steel is also used for making coater blades, for example, the steel with the trade mark UHB®716, which has the principal analysis 0.38 C, 0.5 Si, 0.55 Mn, 13.5 Cr, 1.0 Mo, and the remainder iron and contaminants in normal proportions.
  • scrapers In the printing industry band-shaped spreading tools, known as scrapers, are also used. They are similar to the coater blades used in the paper industry. These scrapers must also satisfy high requirements in terms of straightness. The same material is used in both scrapers and coater blades.
  • coater and doctor blades When coater and doctor blades are used they are worn down heavily by the pigment in the surface application material, which is abrasive and by the base paper in the case of coater blades, and by the color pigment in the application ink, which is spread by the doctor blades. It is thus also desirable that both coater blades and doctor blades have a high abrasion resistance and consequently long life span. Neither carbon steel nor martensite stainless steel doctor blades do, however, satisfy this condition. Consequently, it is standard practice to replace blades already after a few hours of operation in a paper machine. This is of course a disadvantage, especially because of the loss of production when replacing the blades.
  • a well known method for increasing the life span of the doctor blades is to coat the edges with a ceramic layer. This increases the effective life span considerably, but these doctor blades are very expensive and are consequently not in wide-spread use. It is a well known fact that the abrasion resistance of alloyed steel can be higher than that of non-alloy steel. This is an advantage in certain tool steel and structural steel. Some examples of this are the alloy steels described in JP-A-61/41749, as well as in US 4,743,426 and US 2,565,264, intended, respectively, for guide pins in plastic molds, hot-working steel, for example dies for aluminum extrusion at high temperatures, and for turbine blades, forging tools, cutting tools and similar products, which are made of block or rod material.
  • the basis for the invention is the surprising discovery that hot-rolled strips of a certain steel alloy, of the composition presented in the patent claims, without too much difficulty can be cold-rolled into a thickness smaller than 1 mm and hardened and tempered into an adequate hardness for coater and doctor blades, and that these blades are straight and have an abrasion resistance, and thus effective life span, which is many times higher than that of carbon steel and stainless martensite chromium steel and even is comparable to or the same as what can be achieved using ceramic coated doctor blades.
  • the invention concerns the use of a steel alloy of a specific composition for making coater and doctor blades, the latter also called scrapers, in the shape of cold-rolled, hardened and tempered strips.
  • the figures in the drawing show typical designs.
  • the width B is between 10 and 100 mm (4"), while the thickness of coater blades is between 0.05 and 1 mm, and in a typical case 0.25-0.64 mm, and for doctor blades, in a typical case, 0.07-0.203 mm (0.003-0.008 in.).
  • the machined edge can either be straight (90°) - see Fig. 3 - an edge design typical of coater blades, or be beveled, an edge design used both for coater and doctor blades, see Fig. 2.
  • Carbon should exist in sufficient amounts in the steel to give it a basic hardness, sufficient to endure being pressed against the paper web or ink application roll, respectively, without suffering permanent deformation, and to form MC carbides during tempering.
  • the MC carbides provide precipitation hardening and thus improved abrasion resistance.
  • the carbon content should consequently be at least 0.46 %, and preferably at least 0.50 %.
  • the carbon content must not be high enough to risk inducing primary carbides to any great extent, since this could destroy the toughness of the material and also result in scratches in the coated paper surface. Maximum carbon content is thus 0.70 %, and preferably at most 0,65 %. It is advantageous if the steel contains between 0.52 and 0.58 C. The optimal carbon content in the steel is thought to be 0.55 %.
  • Vanadium should exist in the steel to form very small MC carbides during tempering, through precipitation. These MC carbides are thought to be the major reason for the surprisingly good abrasion resistance of the doctor blades.
  • the carbides are of a submicroscopic scale, which means a maximum size of the order of magnitude 100 angstrom.
  • the vanadium content should be at least 0.5 %, preferably at least 0.6 % and it is advantageous to make it at least 0.7 %.
  • vanadium content must not be too high, since this can cause the formation of primary carbides, which are not dissolved during the austenitizing.
  • the steel must then at most contain a maximum of 1.5 % vanadium, preferably at most 1.4% and it is advantageous if it contains at most 1.3%.
  • Chromium content should be at least 1 %, preferably at least 1.5 % and it is advantageous to make it at least 2 %, to give the steel sufficient hardenability, i.e., transform it into martensite during air quenching or after austenitizing.
  • chromium is also carbide forming, which makes it compete with vanadium for the carbon in the steel matrix. The higher the chromium content, the less stable are the vanadium carbides. The chromium carbides, however, do not provide the precipitation hardening that is desirable and that vanadium in the above mentioned amounts can provide.
  • the chromium content in the steel is limited to 6 %, preferably at most 4 % and it is advantageous to make it at most 3 %.
  • Molybdenum content should be at least 0.3 %, preferably at least 1 % and it is advantageous to make it at least 2 %, so that it jointly with vanadium can be a part of the MC carbides and in a positive way contribute to the formation of these carbides.
  • molybdenum can be said to be a complement to the vanadium. Since there is molybdenum in the MC carbides, these dissolve more easily during austenitizing when hardening occurs and are then a part of the MC carbides formed during the tempering. Molybdenum content may, however, not be so high as to form detrimental amounts of molybdenum carbides, which are instable, just like chromium carbides, and grow at high temperatures.
  • the molybdenum content should therefore be limited to 5 %, preferably 4 % and it is advantageous to make it at most 3 %. Molybdenum can, in the usual fashion, be replaced, completely or partially, by the double amount of tungsten. It is best, however, to avoid this, to make the steel composition less complex. In the preferred form of implementation the alloy composition should therefore not contain tungsten, more than contaminant levels.
  • Manganese content in the steel is between 0.1 and 2 % and contributes, just like chromium, to give the steel the desired hardenability.
  • Silicon content should be at least 0.2 %, preferably at least 0.6 % and it is advantageous to make it at least 0.8 %, to increase the carbon activity in steel and speed up the precipitation of the small vanadium carbides during tempering.
  • the increased carbon activity can, however, also lead to a faster coarsening of the carbides, resulting in a quicker softening of the steel.
  • the tempering curve is moved to the left and the hardness hump is moved upwards, when silicon content is high.
  • the steel should, however, not contain more than at most 1.5 % silicon and preferably at most 1.2 % silicon.
  • Boron may possibly be added to the steel, with a maximum content of 0.01 %, to further increase the hardenability of the steel.
  • Nickel does not provide any positive contributions to the steel in the intended application area.
  • the nickel content of up to at most approximately 1 % does not provide any significant negative effects on material properties, but may somewhat complicate the heat treatment thereof.
  • a nickel content of at most 1 % is therefore acceptable, a maximum of 0.5 % is preferable, but it is best if the steel does not contain more nickel than contaminant levels.
  • Niobium content in the steel for the current application area was not specifically tested. It is well known from other tests, however, that niobium can partially replace vanadium, but niobium can give embrittlement effects and should therefore be avoided. A maximum of 0.2 % niobium should, however, not provide any significant detrimental effects.
  • the steel contains essentially nothing but iron.
  • Other elements including for example aluminum, nitrogen, copper, cobalt, titanium, sulphur and phosphorus, only exist in contaminant levels or as unavoidable accessory elements in the steel.
  • the nominal composition of the material which according to the invention will be used for the manufacturing of coater or doctor blades is the following: 0.55 C, 1.0 Si, 0.80 Mn, 2.6 Cr, 2.3 Mo, 0.90 V and the remainder iron and unavoidable contaminants.
  • coater or doctor blades will be done as follows.
  • An alloy containing the desired composition, described above and in the patent claims, is produced using conventional pyrometallurgical processing.
  • the alloy is made into ingots, which are hot-rolled into strips of an approximate thickness of 3 mm. These strips are cold-rolled to desired thickness of less than 1 mm, alternating with reheating operations.
  • the cold-rolled strips produced in this fashion will be hardened using austenitizing at a temperature in excess of 1000 °C, followed by quenching in liquid lead at a temperature of between 240 and 270 °C and tempering at 400 °C.
  • the strips are subsequently yellow tempered through heating to a temperature between 320 and 370 °C, in an oxidizing atmosphere.
  • the strips are cut to correct length and width, and the edge machined through planing and/or grinding to obtain the desired edge profile, see Fig. 2 and 3.
  • the performing edge may be hardened using local heating of the edge section, for example by induction heating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Screen Printers (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (13)

  1. Bandes laminées à froid, épaisses de 0,05 à 1,00 mm, durcies et trempées, adaptées à être utilisées comme matériau pour la fabrication de lames de couchage et docteurs, lesquelles bandes sont faites d'une composition d'alliage d'acier consistant, en pourcentage en poids, en :
    0,46 à 0,70 de C
    0,2 à 1,5 de Si
    0,1 à 2,0 de Mn
    1,0 à 6,0 de Cr
    0,5 à 5 de Mo
    0,5 à 1,5 de V
    0,01 de B au plus
    1,0 de Ni au plus
    0,2 de Nb au plus
       et le reste consistant en fer, en impuretés et en éléments secondaires inévitables dans des proportions normales.
  2. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier renferme 0,50 à 0,65 % de C.
  3. Bandes laminées à froid selon la revendication 2, dans lesquelles l'alliage d'acier renferme 0,52 à 0,58 % de C.
  4. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier renferme 1,4 à 4 % de Cr.
  5. Bandes laminées à froid selon la revendication 4, dans lesquelles l'alliage d'acier renferme 2 à 3 % de Cr.
  6. Bandes laminées à froid selon la revendication 5, dans lesquelles l'alliage d'acier renferme 2,5 à 3 % de Cr.
  7. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier renferme 1 à 4 % de Mo.
  8. Bandes laminées à froid selon la revendication 7, dans lesquelles l'alliage d'acier renferme 2 à 3 % de Mo.
  9. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier renferme 0,6 à 1,4 % de V.
  10. Bandes laminées à froid selon la revendication 9, dans lesquelles l'alliage d'acier renferme 0,7 à 1,3 % de V.
  11. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier renferme 0,6 à 1,2 % de Si.
  12. Bandes laminées à froid selon la revendication 1, dans lesquelles l'alliage d'acier a une teneur en cobalt ne dépassant pas les teneurs contaminantes.
  13. Bandes laminées à froid selon la revendication 1, dans laquelle l'alliage d'acier a une teneur en tungstène ne dépassant pas les teneurs contaminantes.
EP19950100236 1994-02-17 1995-01-10 Bandes en acier laminées à froid Expired - Lifetime EP0672761B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9400532A SE502969C2 (sv) 1994-02-17 1994-02-17 Användning av en stållegering som material till bestrykningsschabrar i form av kallvalsade band
SE9400532 1994-02-17

Publications (3)

Publication Number Publication Date
EP0672761A2 EP0672761A2 (fr) 1995-09-20
EP0672761A3 EP0672761A3 (fr) 1995-11-08
EP0672761B1 true EP0672761B1 (fr) 1997-12-29

Family

ID=20392963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950100236 Expired - Lifetime EP0672761B1 (fr) 1994-02-17 1995-01-10 Bandes en acier laminées à froid

Country Status (4)

Country Link
EP (1) EP0672761B1 (fr)
JP (1) JP3574207B2 (fr)
DE (1) DE69501276T2 (fr)
SE (1) SE502969C2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0100505L (sv) * 2001-02-16 2002-07-23 Btg Eclepens Sa Självjusterande blad
KR20030033562A (ko) * 2001-10-24 2003-05-01 김창준 닥터블레이드
KR101360922B1 (ko) 2002-06-13 2014-02-11 우데홀름스 악티에보라그 냉간 가공 강 및 냉간 가공 공구
DE102004034905A1 (de) * 2004-07-19 2006-04-13 Böhler-Uddeholm Precision Strip GmbH & Co. KG Stahlband für Streichmesser, Auftragsmesser und Kreppschaber und pulvermetallurgisches Verfahren zu ihrer Herstellung
JP2011218464A (ja) * 2010-04-06 2011-11-04 Daetwyler Swisstec Ag ドクタを製造する方法
US8635755B2 (en) 2010-04-13 2014-01-28 Daetwyler Swisstec Ag Method for producing doctor blades
SE535064C2 (sv) * 2010-08-23 2012-04-03 Sandvik Intellectual Property Kallvalsad och härdad bandstålsprodukt
EP2896714B1 (fr) * 2014-01-17 2016-04-13 voestalpine Precision Strip AB Lame de crêpage et son procédé de fabrication
CN105256252A (zh) * 2015-10-15 2016-01-20 芜湖市宝艺游乐科技设备有限公司 一种耐温抗蠕变预硬型塑料模具钢及其制备方法
CN115233101A (zh) * 2022-07-22 2022-10-25 上海大学(浙江)高端装备基础件材料研究院 一种超高强度合金钢和一种18.8级螺纹紧固件及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565264A (en) * 1950-02-17 1951-08-21 Crucible Steel Co America Hardenable alloy steels resistant to softening at elevated temperatures
JPS5125217B2 (fr) * 1973-07-09 1976-07-29
US4853181A (en) * 1986-06-18 1989-08-01 Wert David E Hot work tool steel
JPS63128153A (ja) * 1986-11-18 1988-05-31 Kobe Steel Ltd 耐へたり性に優れたばね用鋼
SE459722B (sv) * 1987-11-27 1989-07-31 Uddeholm Steel Strip Laminerat staalband samt av staalbandet framstaellt verktyg
AU633737B2 (en) * 1990-06-19 1993-02-04 Nisshin Steel Company, Ltd. Method of making steel for springs

Also Published As

Publication number Publication date
EP0672761A2 (fr) 1995-09-20
EP0672761A3 (fr) 1995-11-08
DE69501276T2 (de) 1998-05-28
JPH07268542A (ja) 1995-10-17
DE69501276D1 (de) 1998-02-05
JP3574207B2 (ja) 2004-10-06
SE9400532D0 (sv) 1994-02-17
SE502969C2 (sv) 1996-03-04
SE9400532L (sv) 1995-08-18

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