EP2423345B1 - Cold rolled and hardened strip steel product - Google Patents

Cold rolled and hardened strip steel product Download PDF

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Publication number
EP2423345B1
EP2423345B1 EP11170995.2A EP11170995A EP2423345B1 EP 2423345 B1 EP2423345 B1 EP 2423345B1 EP 11170995 A EP11170995 A EP 11170995A EP 2423345 B1 EP2423345 B1 EP 2423345B1
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EP
European Patent Office
Prior art keywords
strip steel
steel product
product according
content
carbides
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.)
Active
Application number
EP11170995.2A
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German (de)
English (en)
French (fr)
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EP2423345A1 (en
Inventor
Maria Sundqvist
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.)
Sandvik Intellectual Property AB
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Sandvik Intellectual Property AB
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Publication of EP2423345A1 publication Critical patent/EP2423345A1/en
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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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • 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
    • C21D2211/004—Dispersions; Precipitations

Definitions

  • the present invention relates to a cold rolled and hardened strip steel product manufactured by conventional metallurgy suitable for manufacturing of coater and doctor blades.
  • the invention relates to a steel strip product made from a steel composition containing alloying additions which forms carbides with carbon in the alloy and therefore increases the strength and wear resistance of the alloy.
  • Strip steel products are used in the paper and printing industries in the form of coater blades, doctor blades and crepe blades, for example. These blades have in common that they are relatively thin and long and has to endure high demands with regards to straightness, resistance to wear and strength.
  • coater 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. Furthermore, any unplanned interruption in the printing process is costly and the coater blades should have a high resistance to wear and have a predictable lifetime.
  • carbon steels have been used for the manufacturing of blades for the paper and printing industries, due to their high hardenability.
  • EP 0 672 761 describes a steel alloy comprising 2.6 % Cr, 2.3 % Mo, 2 % V, 0.55% C, 1.0% Si and 0.8 % Mn.
  • US 6 547 846 discloses a steel alloy containing 4.0 % Cr, 2.0 % Mo, 2.0 % W, 1.0-1.8 % V, 0.32-0.35 Mn, 0.46-1.0 Si an 0.48-0.75% C.
  • US 6 632 301 B2 discloses various steel alloys having up to 2.6 % Cr, up to 2.3 % Mo, up to 0.56 % W and up to 0.9 % V.
  • JPH10298709 discloses alloys having a compsition containing by weight, 0.40 to 0.55% C, ⁇ +1.20% Si, 0.1 to 1.5% Mn, 0.1 to 1.0% Ni, >3.5 to ⁇ 4.0% Cr, one or two kinds of W and Mo by 1.0 to 3.0% in terms of 1/2W+Mo, 0.2 to 1.5% V, and the balance Fe inevitable impurities.
  • the introduction of carbide formers and hence a distribution of hard carbides in the final steel product has increased the hardness and wear resistance of the material.
  • the hardness alone does not make the material optimal for the intended use as blades in the paper and printing industries.
  • the part of the blades contacting the other surface is typically a thin edge.
  • the wear should be small, but also well controlled and even along the contacting surface.
  • the introduction of carbides has the drawback of increasing the risk for chipping at the edge of the blade, if the carbides are too big, as the thickness of the blade at the edge can be in the same order as the size of the carbides.
  • the object of the present invention is achieved by means of a strip steel product e as defined in claim1.
  • the present invention relates to a strip steel product that it consists of a steel alloy in having the following composition in weight-%: C: 0.4-0.8, Si: 0.4-1.2, Mn: 0.2-0.55, Cr: 3.5-4.5, W: 1.5-4.0, and Mo: 1.0-1.8, balance Fe and normally occurring impurities.
  • the strip steel product is preferably utilised in printing and paper production blades such as coater blades, doctor blades and crepe blades.
  • the strip steel product according to the invention has a hardness in the order of 670 HV and has been shown to have excellent wear resistance in wear measurements and test production.
  • the inventive strip steel product it is possible to produce for example coater blades, with a significantly increased lifetime, and thereby reducing the downtime in a paper or printing production line.
  • the possibility to control the size distribution of the carbides in the strip steel product makes it possible to provide blades with a thin edge, but with a significantly reduced tendency to chipping.
  • the steel according to the present disclosure is produced by conventional methods, such as melting, casting, forging, hot and cold rolling.
  • the thin dimensions of the final products make other methods such as powder metallurgy less suitable as the size and distribution of the carbides need to be carefully controlled. Also the difficulties in controlling the oxygen content in the powder, and hence the oxide in the final product makes powder technology less attractive.
  • the content of carbon affects the hardenability of the material and also the hardness thereof.
  • the content of C needs to the at least approximately 0.4 % by weight.
  • carbon When present in higher amounts carbon also forms carbides, which in turn increases the hardness of the alloy further.
  • a too high content of C makes it difficult to process. Therefore, the content of C should be limited to maximally 0.8 % by weight.
  • a carbon content of 0.4-0.8 wt% is selected in order to achieve an appropriate amount of carbides and a good hardenability.
  • the carbon content is 0.45-0.7 wt%.
  • Silicon is always present as a result of the manufacturing process, desoxidation for example. Also, it facilitates the hardening process wherein a through hardening is favoured. Furthermore, it improves the high temperature strength. However, too high levels of silicon will stabilise the ferrite which is not desired for a high strength material.
  • the content of silicon is 0.4-1.2 wt%. According to an embodiment the content is max 0.4-0.9 wt%.
  • Mn is i.a. present as a result of the manufacturing process, wherein it improves desoxidation and neutralises the detrimental effect of sulphur. It also improves the yield and tensile strength as well as facilitates the through hardening. Too high levels of Mn may cause high levels of residual austenite, wherein the suitable content of Mn with regard to the risk of residual austenite depends on the other alloying elements. According to the present composition the content of Mn is 0.2-0.55 wt%. According to an embodiment, the content of Mn is 0.20-0.40 wt%.
  • Chromium improves the strength of the alloy as well as the wear resistance. It forms carbides with carbon. Cr also gives the steel sufficient hardenability by allowing enough martensite to be formed during quenching in air, oil or water. However, a too high content of Cr renders desired carbides of for example V less stable.
  • the composition according to the present invention contains 3.5-4.5 wt% Cr.
  • Tungsten forms carbides with carbon. As a result thereof, it increases the wear resistance. Furthermore, a through hardening is facilitated since W suppresses the formation of bainite. W also improves the high temperature strength. It also renders a good edge sharpness of the material. According to the present invention a tungsten content of 1.5 wt% is required in order to achieve the positive effects. However, a too high content of tungsten in combination with a high content of carbon generates too much carbide in an early production stage, i.e. primary carbides, and therefore results in difficulties to process the material, for example by hot rolling.
  • the maximum content of W of the present alloy composition is therefore limited to 4 wt%, preferably max 2.5 wt%. According to an embodiment the W content is 1.5-2.5 wt%.
  • Mo increases the high temperature strength of the alloy. As some of the other elements of the alloy, Mo also forms carbides with carbon. It also increases the yield strength and facilitates through hardening. A too high content of Mo makes the steel more disposed to oxidise during processing which can make the manufacturing process more difficult.
  • the present alloy composition therefore contains 1-1.8 wt% Mo.
  • impurities are always present due to the composition of the scrap used.
  • impurities are Ni and Cu, which two elements should be limited to max 0.2 wt% of each.
  • impurities are also present due to normally occurring steelmaking alloying additions for e.g. desoxidation or hot ductility.
  • sample A A number of samples with nominal compositions within the range of the steel composition according to the present invention were manufactured by conventional metallurgy processing in a melting furnace, re-melting, cast, forged and hot-rolled. An average of the samples are denoted sample A in table 1 and hereinafter. Table 1 also presents commercially available comparison samples, wherein sample B is a steel composition corresponding to the alloy disclosed in EP 0 672 761 , C is a traditional carbon steel, and D is a high Cr alloy. The contents are given in % by weight.
  • Figure 2 illustrates the result of wear measurement.
  • the wear measurements were designed to closely mimic realistic conditions. Blades of the materials according to table 1 were worn against a 175 cm anilox cylinder at a pressure of 2 bar, at 200 m/min in 16 hours. a) is with process water as the medium, b) de-ionized water and c) the average result. As illustrated in figure 2a-c the sample A, with a composition according to the present invention exhibited a superior resistance to wear as compared to samples B, C and D. In the case with process water an approximate improvement of 25% were observed. Similar results have been observed in actual production testing.
  • the strip steel product has to have a high hardness in order to be suitable for the listed applications.
  • the strip steel product according to the invention exhibits a hardness of approximately 670 HV and a tensile strength of 2200 MPa. If required, the hardness can be further increased by edge hardening.
  • the size distribution of the carbides i.e. the chromium and tungsten carbide particles, is of importance for the mechanical properties of the strip steel product.
  • the size distribution of carbides in the steel strip product according to the present invention is illustrated in Figure 3 : chromium carbides (squares), tungsten carbides (diamonds) and combined (triangles).
  • the carbide size distribution has been extracted from SEM-micrographs by image processing.
  • the diameter of the carbides should be below 1 ⁇ m and preferably the majority of the carbides have a diameter below 0.6 ⁇ m.
  • strip steel product according to the invention has been illustratively described with references to applications such as coater blades, doctor blades and crepe blades. Also other applications wherein a hard and wear resistant strip steel is utilised for example knife and saw applications, valve applications and dies for example label dies.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Paper (AREA)
EP11170995.2A 2010-08-23 2011-06-22 Cold rolled and hardened strip steel product Active EP2423345B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1050861A SE535064C2 (sv) 2010-08-23 2010-08-23 Kallvalsad och härdad bandstålsprodukt

Publications (2)

Publication Number Publication Date
EP2423345A1 EP2423345A1 (en) 2012-02-29
EP2423345B1 true EP2423345B1 (en) 2017-10-18

Family

ID=44645475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11170995.2A Active EP2423345B1 (en) 2010-08-23 2011-06-22 Cold rolled and hardened strip steel product

Country Status (4)

Country Link
EP (1) EP2423345B1 (cg-RX-API-DMAC7.html)
JP (1) JP5908686B2 (cg-RX-API-DMAC7.html)
CN (1) CN102373373B (cg-RX-API-DMAC7.html)
SE (1) SE535064C2 (cg-RX-API-DMAC7.html)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2896714B1 (en) * 2014-01-17 2016-04-13 voestalpine Precision Strip AB Creping blade and method for its manufacturing
EP3031982B1 (en) * 2014-12-10 2017-03-29 voestalpine Precision Strip AB A long life cermet coated crêping blade
EP3165367A1 (en) 2015-11-04 2017-05-10 BTG Eclépens S.A. Doctor blade, inking arrangement and use of doctor blade in flexographic printing

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509640A1 (fr) * 1981-07-17 1983-01-21 Creusot Loire Procede de fabrication d'une piece metallique composite et produits obtenus
SE502969C2 (sv) 1994-02-17 1996-03-04 Uddeholm Steel Strip Användning av en stållegering som material till bestrykningsschabrar i form av kallvalsade band
JPH10298709A (ja) * 1997-04-25 1998-11-10 Hitachi Metals Ltd 耐摩耗性に優れる熱間加工用工具鋼および工具鋼製品
JPH11229031A (ja) * 1998-02-13 1999-08-24 Hitachi Metals Ltd 高速度工具鋼工具の製造方法
JPH11279640A (ja) * 1998-03-30 1999-10-12 Hitachi Metals Ltd 平坦度に優れた高速度工具鋼鋼帯およびその製造方法
SE512970C2 (sv) 1998-10-30 2000-06-12 Erasteel Kloster Ab Stål, användning av stålet, av stålet framställd produkt samt sätt att tillverka stålet
US6632301B2 (en) 2000-12-01 2003-10-14 Benton Graphics, Inc. Method and apparatus for bainite blades
JP2004315840A (ja) * 2003-04-11 2004-11-11 Daido Steel Co Ltd 被削性に優れた冷間工具鋼及びその製造方法
SE526191C2 (sv) * 2003-12-19 2005-07-26 Sandvik Ab Eggförsett verktyg och metod för framställning därav
JP4403875B2 (ja) * 2004-05-14 2010-01-27 大同特殊鋼株式会社 冷間工具鋼
JP4857811B2 (ja) * 2006-02-27 2012-01-18 Ｊｆｅスチール株式会社 刃物用鋼
CN101153374B (zh) * 2006-09-27 2010-09-08 宝山钢铁股份有限公司 一种切纸机刀片用钢及其制造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
SE535064C2 (sv) 2012-04-03
CN102373373A (zh) 2012-03-14
JP2012041632A (ja) 2012-03-01
SE1050861A1 (sv) 2012-02-24
EP2423345A1 (en) 2012-02-29
JP5908686B2 (ja) 2016-04-26
CN102373373B (zh) 2016-01-06

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