SE535064C2 - Cold rolled and cured strip steel product - Google Patents
Cold rolled and cured strip steel product Download PDFInfo
- Publication number
- SE535064C2 SE535064C2 SE1050861A SE1050861A SE535064C2 SE 535064 C2 SE535064 C2 SE 535064C2 SE 1050861 A SE1050861 A SE 1050861A SE 1050861 A SE1050861 A SE 1050861A SE 535064 C2 SE535064 C2 SE 535064C2
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- SE
- Sweden
- Prior art keywords
- strip steel
- steel product
- product according
- blades
- content
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000007639 printing Methods 0.000 claims abstract description 10
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 6
- 150000001247 metal acetylides Chemical class 0.000 claims description 18
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 239000011651 chromium Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- WIGAYVXYNSVZAV-UHFFFAOYSA-N ac1lavbc Chemical compound [W].[W] WIGAYVXYNSVZAV-UHFFFAOYSA-N 0.000 description 1
- RMXTYBQNQCQHEU-UHFFFAOYSA-N ac1lawpn Chemical compound [Cr]#[Cr] RMXTYBQNQCQHEU-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- -1 chromium carbides Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- SBEQWOXEGHQIMW-UHFFFAOYSA-N silicon Chemical compound [Si].[Si] SBEQWOXEGHQIMW-UHFFFAOYSA-N 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
Abstract
ABSTRACT The present inVention relates to a strip steel product that it consists of a steel alloy inhaving the following con1position 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: l.0-l.8, balance Fe and norrnally occurringin1purities. The strip steel product is preferably utilised in printing and paper production blades such as coater blades, doctor blades and crepe blades.
Description
COLD ROLLED AND HARDENED STRIP STEEL PRODUCT The present invention relates to a cold rolled and hardened strip steel productmanufactured by conventional metallurgy suitable for manufacturing of coater anddoctor blades. In particular the invention relates to a steel strip product made from asteel composition containing alloying additions Which forrns carbides With carbon in the alloy and therefore increases the strength and Wear resistance of the alloy.
BACKGROUND TO THE INVENTION Strip steel products are used in the paper and printing industries in the forrn of coaterblades, doctor blades and crepe blades, for example. These blades have in commonthat they are relatively thin and long and has to endure high demands With regards tostraightness, resistance to Wear and strength. For example coater blades are used forcoating the paper Web With a coating slip. These blades are pressed against themoving paper Web, usually With back pressure provided by a counter roll, or by ablade, on the opposite side of the paper Web, When two-sided coating is performed. Toprovide even and top quality coating the coater blade must be straight. The normalspecif1cation is that the machined edge of the coater blade must not deviate more than0.3 mn1/3,000 mm coater blade length, from complete straightness. Furthermore, anyunplanned interruption in the printing process is costly and the coater blades shouldhave a high resistance to Wear and have a predictable lifetime. Traditionally carbonsteels have been used for the manufacturing of blades for the paper and printing industries, due to their high hardenability.
In order to increase strength and Wear resistance it has been suggested to use additionsin the composition that Would result in the formation of carbides. Examples thereof isdisclosed in EP 0 672 761 and US 6 547 846. EP 0 672 76l describes a steel alloy comprising 2.6 % Cr, 2.3 % Mo, 2 % V, 0.55% C, l.0% Si and 0.8 %Mn. US 6 547 846 discloses a steel alloy containing 4.0 % Cr, 2.0 % Mo, 2.0 % W,l.0-l.8 % V, 0.32-0.35 Mn, 0.46-l.0 Si an 0.48-0.75% C. Furthermore, US 6 632 30lB2 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.
The introduction of carbide forrners and hence a distribution of hard carbides in thefinal 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 istypically a thin edge. The Wear should be small, but also Well controlled and evenalong the contacting surface. The introduction of carbides has the draWback ofincreasing the risk for chipping at the edge of the blade, if the carbides are too big, asthe thickness of the blade at the edge can be in the same order as the size of the carbides.
Hence, there still is a need for a steel con1position that is Wear resistant, have highstrength and that is relatively easy to n1anufacture and process through n1elting, casting, forging, hot and cold rolling and finally heat treatment.
SUMMARY OF THE INVENTIONIt is an object of the present disclo sure to present a strip steel product which issuitable for high wear applications, such as coater blades, doctor blades and crepe blades.
The object of the present invention is achieved by means of a strip steel product e as defined in claiml.
The present invention relates to a strip steel product that it consists of a steel alloy inhaving the following composition in weight-%: C: 0.4-0.8, Si: 0.4-l.2, Mn: 0.2-0.55,Cr: 3.5-4.5, W: l.5-4.0, and Mo: l.0-l.8, balance Fe and norrnally occurringimpurities. 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 670HV and has been shown to have excellent wear resistance in wear measurements and test production.
Thanks to the inventive strip steel product it is possible to produce for example coaterblades, with a significantly increased lifetime, and thereby reducing the downtime in apaper or printing production line. The possibility to control the size distribution of thecarbides in the strip steel product makes it possible to provide blades with a thin edge, but with a significantly reduced tendency to chipping.
Further features and advantages of the present invention will be presented in the following detailed description and in the independent patent claims.
BRIEF DESCRIPTION OF THE FIGURES Figures la-d Graphs illustrating the result of a Therrno-Calc evaluation, with regardto phases and amount of different phases.
Figures 2a-c Graphs illustrating the result of a wear measurements of the steel strip product according to the present invention in comparison with commercially available products in different media, a) with process water, b) de-ionized water and c) average result; and Figures 3 Graph showing the carbide size distribution of the hardened strip steel.
DETAILED DESCRIPTION The steel according to the present disclo sure is preferably produced by conventionalmethods, such as melting, casting, forging, hot and cold rolling. The thin dimensionsof the final products make other methods such as powder metallurgy less suitable asthe size and distribution of the carbides need to be carefully controlled. Also thediff1culties in controlling the oxygen content in the powder, and hence the oxide in thefinal product makes powder technology less attractive.
The effect and the content of the different alloying elements of the steel composition will now be explained in more detail.
Carbon The content of carbon affects the hardenability of the material and also the hardnessthereof. In order to harden the material the content of C needs to the at leastapproximately 0.4 % by weight. When present in higher amounts carbon also formscarbides, which in tum increases the hardness of the alloy further. However, a toohigh content of C makes it difficult to process. Therefore, the content of C should belimited to maximally 0.8 % by weight. For the alloy according to the presentinvention a carbon content of 0.4-0.8 wt% is selected in order to achieve anappropriate amount of carbides and a good hardenability. According to anembodiment of the invention, the carbon content is 0.45-0.7 wt%. The range of thecarbon content is Verified by TherrnoCalc-calculations as illustrated in Figure la-d,with a carbon content of 0.5 (a), 0.55 (b) 0.6 (c) and 0.65 (d) wt%. The other constituents are as in sample A, Table l.
Silicon Silicon is always present as a result of the manufacturing process, desoxidation forexample. Also, it facilitates the hardening process wherein a through hardening isfavoured. Furthermore, it improves the high temperature strength. However, too highlevels of silicon will stabilise the ferrite which is not desired for a high strengthmaterial. According to the present alloy composition, the content of silicon is 0.4-1.2 wt%. According to an embodiment the content is max 0.4-0.9 wt%.
Manganese Mn is i.a. present as a result of the manufacturing process, Wherein it improvesdesoxidation and neutralises the detrimental effect of sulphur. It also improves theyield and tensile strength as Well as facilitates the through hardening. Too high levelsof Mn may cause high levels of residual austenite, Wherein the suitable content of MnWith 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%. Accordingto an embodiment, the content of Mn is 0.20-0.40 Wt%.
Chromium Chromium improves the strength of the alloy as Well as the Wear resistance. It forrnscarbides With carbon. Cr also gives the steel sufficient hardenability by allowingenough martensite to be forrned during quenching in air, oil or Water. HoWever, a toohigh 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 Tungsten forrns carbides With carbon. As a result thereof, it increases the Wearresistance. Furtherrnore, a through hardening is facilitated since W suppresses theformation of bainite. W also improves the high temperature strength. It also renders agood edge sharpness of the material. According to the present invention a tungstencontent of 1.5 Wt% is required in order to achieve the positive effects. HoWever, a toohigh content of tungsten in combination With a high content of carbon generates toomuch carbide in an early production stage, i.e. primary carbides, and therefore resultsin diff1culties to process the material, for example by hot rolling. The maximumcontent 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%.
Molybdenum Mo increases the high temperature strength of the alloy. As some of the otherelements of the alloy, Mo also forms carbides With carbon. It also increases the yieldstrength and facilitates through hardening. A too high content of Mo makes the steelmore disposed to oxidise during processing Which can make the manufacturingprocess more difficult. The present alloy composition therefore contains 1-1.8 Wt% Mo.
Impurities In addition to the elements above, some impurities are always present due to thecomposition of the scrap used. Examples of such impurities are Ni and Cu, Which twoelements should be limited to max 0.2 Wt% of each. Furthermore, impurities are alsopresent due to norrnally occurring steelmaking alloying additions for e.g. desoxidation or hot ductility.
A number of samples With nominal compositions Within the range of the steelcomposition according to the present invention Were manufactured by conventionalmetallurgy processing in a melting furnace, re-melting, cast, forged and hot-rolled. Anaverage of the samples are denoted sample A in table 1 and hereinafter. Table 1 alsopresents commercially available comparison samples, Wherein sample B is a steelcomposition 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.
Table 1 Sample C Si Mn Cr W V MoA 0,50 0,80 0,30 4,0 2,0 - 1,5B 0,5 1 0,75 2,5 - 0,9 2,3C 1,0 0,3 0,3 1,4 - - -D 0,68 0,4 0,7 13 - - - Figure 2 illustrate the result of Wear measurement. The Wear measurements Weredesigned to closely mimic realistic conditions. Blades of the materials according totable 1 Were Wom against a 175 cm anilox cylinder at a pressure of 2 bar, at 200m/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 compositionaccording to the present invention exhibited a superior resistance to Wear as comparedto samples B, C and D. In the case With process Water an approximate improvement of25% Were observed. Similar results have been observed in actual production testing.As described above 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.
It is believed that the size distribution of the carbides, i.e. the chromium and tungstencarbide particles, is of importance for the mechanical properties of the strip steelproduct. The size distribution of carbides in the steel strip product according to thepresent invention is illustrated in Figure 3: chromium carbides (squares), tungstencarbides (diamonds) and combined (triangles). The carbide size distribution has beenextracted from SEM-micrographs by image processing. For printing doctor blades,and other applications requiring a thin blade, i.e. a thickness up to 0.3 mm, thediameter of the carbides should be below 1 um and preferably the majority of the carbides have a diameter below 0.6 um.
The strip steel product according to the invention has been illustratively describedWith 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 forexample knife and saW applications, Valve applications and dies for example label dies.
Claims (1)
1. Strip steel product characterised in that it consists of a steel alloy in having the following cornposition in Weight-%: C 0.4-0.8Si 0.4-1.2Mn 0.2-0.55Cr 3.5-4.5W 1.5-4.0Mo 1.0-1.8 balance Fe and norrnally occurring irnpurities. Strip steel product according to clairn 1 characterised in that the content of C is 0.45-0.7 % by Weight. Strip steel product according to clairn 1 characterised in that the content of Mn is 0.20-0.40 % by Weight. Strip steel product according to clairn 1 characterised in that the content of W is 1.5-2.5 % by Weight. Strip steel product according to clairn 1 characterised in that the steel alloycornprises carbides of tungsten and chromiurn, the carbides having a diarneter less than 1 urn. Strip steel product according to any of the preceding clairns characterised in that it is produced by conventional rnetallurgy. . Doctor blade for printing applications rnade of a strip steel product according to any of the preceding clairns. Coater blade for pulp and paper industry rnade of a strip steel product according to any of the preceding clairns. 9. Crepe blade for pulp and paper industry n1ade of a strip steel product according to any of the preceding clainis. 10. Label die for printing applications n1ade of a strip steel product according to any of the preceding clainis.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1050861A SE535064C2 (en) | 2010-08-23 | 2010-08-23 | Cold rolled and cured strip steel product |
| EP11170995.2A EP2423345B1 (en) | 2010-08-23 | 2011-06-22 | Cold rolled and hardened strip steel product |
| JP2011181964A JP5908686B2 (en) | 2010-08-23 | 2011-08-23 | Cold rolled and quenched strip steel products |
| CN201110246690.5A CN102373373B (en) | 2010-08-23 | 2011-08-23 | Cold rolling and hardened strip steel product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1050861A SE535064C2 (en) | 2010-08-23 | 2010-08-23 | Cold rolled and cured strip steel product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1050861A1 SE1050861A1 (en) | 2012-02-24 |
| SE535064C2 true SE535064C2 (en) | 2012-04-03 |
Family
ID=44645475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1050861A SE535064C2 (en) | 2010-08-23 | 2010-08-23 | Cold rolled and cured strip steel product |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2423345B1 (en) |
| JP (1) | JP5908686B2 (en) |
| CN (1) | CN102373373B (en) |
| SE (1) | SE535064C2 (en) |
Families Citing this family (3)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509640A1 (en) * | 1981-07-17 | 1983-01-21 | Creusot Loire | PROCESS FOR PRODUCING A COMPOSITE METAL PART AND PRODUCTS OBTAINED |
| SE502969C2 (en) | 1994-02-17 | 1996-03-04 | Uddeholm Steel Strip | Use of a steel alloy as material for coating scrapers in the form of cold rolled strips |
| JPH10298709A (en) * | 1997-04-25 | 1998-11-10 | Hitachi Metals Ltd | Tool steel for hot working excellent in wear resistance, and tool steel product |
| JPH11229031A (en) * | 1998-02-13 | 1999-08-24 | Hitachi Metals Ltd | Production of high speed tool steel tool |
| JPH11279640A (en) * | 1998-03-30 | 1999-10-12 | Hitachi Metals Ltd | High speed tool steel strip excellent in flatness, and its manufacture |
| SE512970C2 (en) | 1998-10-30 | 2000-06-12 | Erasteel Kloster Ab | Steel, the use of the steel, the product made of the steel and the way of making the steel |
| US6632301B2 (en) | 2000-12-01 | 2003-10-14 | Benton Graphics, Inc. | Method and apparatus for bainite blades |
| JP2004315840A (en) * | 2003-04-11 | 2004-11-11 | Daido Steel Co Ltd | Cold working tool steel superior in machinability, and manufacturing method therefor |
| SE526191C2 (en) * | 2003-12-19 | 2005-07-26 | Sandvik Ab | Egg-provided tools and methods for making them |
| JP4403875B2 (en) * | 2004-05-14 | 2010-01-27 | 大同特殊鋼株式会社 | Cold work tool steel |
| JP4857811B2 (en) * | 2006-02-27 | 2012-01-18 | Ｊｆｅスチール株式会社 | Steel for knives |
| CN101153374B (en) * | 2006-09-27 | 2010-09-08 | 宝山钢铁股份有限公司 | Steel for paper cutter blade and method of producing the same |
-
2010
- 2010-08-23 SE SE1050861A patent/SE535064C2/en unknown
-
2011
- 2011-06-22 EP EP11170995.2A patent/EP2423345B1/en active Active
- 2011-08-23 CN CN201110246690.5A patent/CN102373373B/en active Active
- 2011-08-23 JP JP2011181964A patent/JP5908686B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012041632A (en) | 2012-03-01 |
| SE1050861A1 (en) | 2012-02-24 |
| CN102373373A (en) | 2012-03-14 |
| JP5908686B2 (en) | 2016-04-26 |
| EP2423345A1 (en) | 2012-02-29 |
| EP2423345B1 (en) | 2017-10-18 |
| CN102373373B (en) | 2016-01-06 |
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