EP3655556A1 - Fil d'acier pour garniture de cardes souples - Google Patents

Fil d'acier pour garniture de cardes souples

Info

Publication number
EP3655556A1
EP3655556A1 EP18737585.2A EP18737585A EP3655556A1 EP 3655556 A1 EP3655556 A1 EP 3655556A1 EP 18737585 A EP18737585 A EP 18737585A EP 3655556 A1 EP3655556 A1 EP 3655556A1
Authority
EP
European Patent Office
Prior art keywords
steel wire
weight
less
microstructure
card clothing
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.)
Granted
Application number
EP18737585.2A
Other languages
German (de)
English (en)
Other versions
EP3655556B1 (fr
Inventor
Li Shen
Xiaojiang Liu
Wim VAN HAVER
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Publication of EP3655556A1 publication Critical patent/EP3655556A1/fr
Application granted granted Critical
Publication of EP3655556B1 publication Critical patent/EP3655556B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C22C38/02—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/18—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/84—Card clothing; Manufacture thereof not otherwise provided for
    • D01G15/86—Card clothing; Manufacture thereof not otherwise provided for with flexible non-metallic backing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • 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
    • C21D2211/008—Martensite
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length

Definitions

  • the invention relates to a steel wire for flexible card clothing with improved lifetime.
  • the invention also relates to flexible card clothing with improved lifetime.
  • Carding is an important process step in the production of cotton yarns.
  • the cotton fibers are fed as flocks into the carding machines.
  • the cotton fibers are disentangled from the tufts and provided in substantially parallel way in a web of fibers.
  • impurities such as neps, wood or leaf particles, seed fragments... are removed from the fibers.
  • Metallic card wire is produced by punching teeth in a profiled steel wire.
  • a round steel wire is first drawn and then rolled to reduce the cross sectional area of the wire and to create the required cross sectional shape of the profiled steel wire.
  • the steel wire needs to have an appropriate microstructure. It is known to perform a batch annealing heat treatment on the steel wire in between steps of the cold deformation process.
  • the annealing heat treatment involves spheroidisation of the cementite in the pearlite microstructure to facilitate the cold deformation.
  • CN105838981A discloses a steel grade that can be used for the production of metallic card wire.
  • Flexible card clothing comprises small metal hooks which are set into a resilient
  • the hooks are made of steel wires bent into a U shape and provided with a knee.
  • the U-shaped hooks have two sharp tips. The sharpness is important for efficient and effective individualization of cotton fibers.
  • the production processes of steel wires used in the production of flexible card clothing differ fundamentally from the production process of steel wires for metallic card clothing and the production process of metallic card clothing.
  • Steel wire for the production of flexible card clothing is produced - via wire drawing and/or wire rolling - while having a pearlite microstructure.
  • the steel wire undergoes a heat treatment process in which the microstructure of the entire steel wire is transformed into tempered martensite.
  • This heat treatment process involves austenization of the whole steel wire, followed by quenching to transform the whole steel wire to martensite and tempering to provide the whole steel wire with the tempered martensite microstructure.
  • the steel wire having a tempered martensite microstructure is used to manufacture the small metal hooks of the flexible card clothing.
  • JP8035125 discloses a steel wire for the production of card clothing.
  • the steel wire has high mechanical strength, toughness, elongation, also wear resistance.
  • the wire is made from a steel alloy composition comprising 0.5 - 0.7 % C by weight, 1.2 - 1.6 % Si by weight, 0.5 - 0.9 % Mn by weight, 0.5 - 1.5 % Cr by weight; and the rest Fe and inevitable impurities.
  • the tensile strength is greater than or equal to 2500 N/mm 2 (2500 MPa) and the elongation at break is more than 5 %.
  • An objective of the invention is to provide a steel wire for the production of flexible card clothing with improved lifetime. Another objective of the invention is to provide flexible card clothing with improved lifetime.
  • the first aspect of the invention is a steel wire for flexible card clothing.
  • the steel wire has an equivalent diameter between 0.2 and 0.7 mm. With equivalent diameter is meant the diameter of the cross section of a steel wire with circular cross section having the same cross sectional area as the steel wire not necessarily having a circular cross section.
  • the steel wire has a composition comprising between 0.7% and 1.1 % by weight carbon; between 0.5% and 1.2% (and preferably less than 1 %) by weight manganese; between 0.05% and 0.5% by weight silicon.
  • the steel wire further comprises less than 0.4% by weight chromium; less than 0.05% by weight phosphorus; less than 0.05% by weight sulphur; less than 0.2% by weight copper; and less than 0.2% by weight nickel.
  • the steel wire comprises at least one alloying element, and preferably a plurality of alloying elements.
  • the at least one alloying element - and preferably the plurality of alloying elements - are selected from the group of vanadium, titanium, niobium, molybdenum, tungsten and boron.
  • the content of the at least one alloying element is between 0.02% and 0.2% by weight.
  • the at least one alloying element is boron
  • the content of boron is at least 0.001 % - and preferably more than 0.004% - by weight.
  • the steel wire composition further comprises unavoidable impurities and the remainder being iron.
  • the steel wire has a tempered martensitic microstructure.
  • the microstructure of the steel wire comprises between 1 and 10 % by volume of undissolved carbides.
  • the microstructure of the steel wire comprises more than 2% by volume of undissolved carbides.
  • the microstructure of the steel wire comprises more than 3% by volume of undissolved carbides.
  • the microstructure of the steel wire comprises more than 4% by volume of undissolved carbides.
  • undissolved carbides is meant the carbides that have not been dissolved when austenitizing the steel wire.
  • the austenitizing process to manufacture the steel wire of the invention is an incomplete austenitizing of the steel wire.
  • Undissolved carbides are alternatively known as primary carbides or spheroidized carbides. They are called spheroidized carbides because of their spherical shape.
  • SEM scanning electron microscopy
  • volume percentage volume percentage
  • the steel wire of the invention allows making flexible card clothing with higher lifetime, thanks to the combination of improved resistance against the abrasive forces acting on the tips of the hooks, and the higher resistance against bending fatigue load.
  • the specific microstructure and composition of the steel wire allows that the tips of the hooks of the flexible card clothing can be hardened to high hardness, and thus to high abrasion resistance.
  • the tips can be converted by the hardening treatment into a fine martensitic microstructure (thanks to alloy composition and the fine microstructure of the inventive steel wire) with high carbon content and free from undissolved carbides.
  • the specific fine tempered martensitic microstructure comprising undissolved carbides provides the improved fatigue resistance (resistance against permanent deformation and even against breakage) of the flexible card clothing. This is achieved as the martensitic microstructure comprises lower carbon content because of the carbon present in the undissolved carbides. Therefore, the card wire surprisingly allows making flexible card clothing combining high fatigue resistance (thanks to a high yield strength Rp0.2) with high abrasion resistance at the tips after hardening, and therefore longer lifetime.
  • the combination of high fatigue resistance with high abrasion resistance of the tips is surprising as these properties are normally inversely correlated to each other.
  • Steel wires according to the invention can be made according to the following process: steel wires are processed into final cross sectional shape and dimensions according to techniques known in the art. After reaching the final cross sectional shape and dimensions, specific heat treatment is performed that provides the steel wire of the invention with the specific microstructure and properties.
  • the wire is incompletely austenitized.
  • the incomplete austenitization is realized by controlling the heating temperature (between Ac1 and Ac3), heating time or the running speed of the elongated steel wire.
  • the incomplete austenitization of the specific steel composition especially the presence of the alloying elements selected from the group of vanadium, titanium, niobium, molybdenum, tungsten and boron - results in the presence of undissolved carbides and a fine microstructure.
  • the austenitization is followed by low temperature quenching (e.g. in oil) and tempering thereby achieving the final microstructure as claimed.
  • the cross section of the steel wire is not round. More
  • the steel wire has a biconvex cross section.
  • biconvex cross section is meant a convex cross section that is continuously rounded.
  • the steel wire has a biconvex cross section with ratio of the longest to the shortest calliper diameter at least 1.2, more preferably 1 .3.
  • biconvex wires are (provided are the longest and the shortest calliper diameter): 0.38 * 0.28 mm; 0.405 * 0.305 mm and 0.43 * 0.33 mm.
  • the residual austenite of the steel wire is less than 4 % by volume, more
  • Such wires are preferred as higher amount of residual austenite could be harmful when converted in the production of the flexible card clothing into untempered martensite, which is a brittle microstructure.
  • the content of residual austenite can be determined by means of X-Ray Diffraction (XRD) or magnetic measurement.
  • a preferred steel wire comprises at least 0.001 % by weight of boron; and more preferably less than 0.01 % by weight of boron.
  • Boron is one of the alloying elements that can be used to achieve the beneficial technical effects of steel wires according to the invention. It is a specific benefit of boron that it can achieve the beneficial effects with only low amount of boron in the steel wire.
  • a preferred steel wire comprises between 0.05 and 0.2% by weight of vanadium; more preferably less than 0.15% by weight of vanadium.
  • Vanadium is one of the alloying elements that can be used in the invention to achieve the beneficial technical effects of steel wires according to the invention.
  • the tempered martensite grains have a shape with a long length and a short length, wherein the ratio of the long length to the short length is less than 2, more preferably less than 1.5.
  • long length and short length are meant the longest and shortest distances in a cross section of the wire through the center of gravity of the grain, as can be determined in optical microscopy on longitudinal sections on steel wires.
  • the tempered martensite grains are equiaxial, meaning they do not have a preferential direction.
  • the presence of inclusions can cause a limited preferential orientation of grains along the longitudinal direction of the wire.
  • such preferential orientation is much less than in an end drawn microstructure; and cannot be confused with the microstructure of an end drawn martensitic wire, in which the preferential longitudinal orientation of tempered martensite grains is much more pronounced.
  • the tempered martensite grains have an average grain size less than 10 ⁇ ; more preferably less than 8 ⁇ , even more preferably less than 6 ⁇ .
  • This fine grain size synergistically contributes to the favourable mechanical properties, e.g. a high yield strength resulting in a resistance to permanent deformation of the flexible card clothing and hence a high lifetime of the card clothing made with such steel wire.
  • Grain size of the tempered martensite grains can be measured according to ASTM E1 12-13. The method is an optical method in which the average is taken from the longest and the smallest dimension of the grain on the picture.
  • the steel wire has tensile strength Rm at least 2400 MPa and yield strength Rp0.2 at least 2100 MPa.
  • a preferred steel wire has yield strength Rp0.2 at least 2200 MPa, more preferably at least 2250 MPa.
  • a preferred steel wire has a ratio of the yield strength Rp0.2 to the tensile strength Rm higher than 90%.
  • the elongation at break At of the steel wire is more than 3%, more preferably more than 4%.
  • a second aspect of the invention is flexible card clothing, comprising hooks and a
  • the hooks comprise steel wire as in any embodiment of the first aspect of the invention.
  • the foundation comprises a number of fabric layers bonded together.
  • the hooks are set into the foundation.
  • Each of the hooks comprises a base section and two legs.
  • the base section is provided parallel with the foundation and at one side of the foundation.
  • the two legs penetrate through the foundation; and each of the two legs has a sharpened tip.
  • each of the legs is bent, providing a knee.
  • Flexible card clothing is made starting from the foundation and steel wire. The first
  • the process step is performed on a setting machine. Short length of steel wire is cut and bent into the shape of a hook. The hook is inserted through the foundation. In most occasions, after insertion into the foundation, each leg of the hook is bent into a knee. After setting all hooks in the foundation, the tips are sharpened on a special machine. This sharpening operation involves grinding the sides of the tips and creating the so-called backing off. This way, a sharp tip is provided that is required for efficient carding.
  • Another step is the hardening of the sharpened tips.
  • the hardening process is a heat treatment of the sharpened tips.
  • the heat treatment involves providing a quenched martensitic microstructure to the tips of the wire, thereby creating enhanced abrasion resistance of the tips.
  • the martensitic microstructure of the tips is free from undissolved carbides, as the undissolved carbides have been dissolved in the austenitization step of the hardening process of the tips.
  • the base and at least part of the legs have a tempered martensitic microstructure.
  • the tips have a martensitic microstructure with Vickers hardness number (HV) higher than 800 HV, more preferably higher than 900 HV.
  • the martensitic microstructure of the tips is free from undissolved carbides, as the undissolved carbides have been dissolved in the austenitization step of the hardening process of the tips.
  • the microstructure of the tips is a quenched martensitic microstructure, more preferably an untempered quenched martensitic microstructure.
  • Figure 1 shows an example of flexible card clothing.
  • Figure 2 illustrates the tensile stress - strain curve of a steel wire.
  • Figure 3 shows an example of a metallic card wire.
  • FIG. 1 shows an example of flexible card clothing 10 according to the invention.
  • the flexible card clothing comprises hooks 12 and a foundation 14.
  • the foundation typically consists out of a number of layers of woven cotton fabric, bonded together by means of a rubber based adhesive, and a top layer 16 of rubber.
  • the hooks comprise steel wire according to the invention.
  • the hooks are set into the foundation.
  • Each of the hooks comprises a base section 18 and two legs 20.
  • the base section is provided parallel with the foundation and at one side of the foundation.
  • the two legs penetrate through the foundation.
  • the legs are bent, thereby forming a knee 22.
  • Each of the two legs has a sharpened tip 24, by side grinding and by providing a backing off 26 to the tip.
  • the tips are hardened, thereby providing a quenched martensitic microstructure to the tips;
  • the flexible card clothing according to the invention can interact on a carding machine with metallic card wire.
  • Figure 3 shows an example 300 of such metallic card wire.
  • Figure 2 provides information about the way the mechanical properties of the steel wires are described in this document. The mechanical properties are described and tested according to ISO 6892-1 :2016.
  • Figure 2 schematically illustrates a stress-strain curve of a steel wire in an uniaxial tensile test. In the X-axis, the strain is provided. The vertical (Y) axis provides the tensile stress (in MPa). The elongation at breakage is represented by At. The tensile strength Rm is the maximum stress. The yield strength Rp0.2 is the stress when crossing the tensile curve with the line through 0.2% strain and parallel with the elastic modulus line.
  • Reference steel wires 1 and 2 are made from wire rod with steel grade A and B
  • Steel wire number 3 is a steel wire according to the invention made of wire rod C.
  • Steel wire number 4 is a steel wire according to the invention made of wire rod D.
  • Steel wires number 5, 6, 7 and 8 are steel wires according to the invention made of wire rod E.
  • Each of the steel wires 3 - 8 is - after processing the steel wire to its final shape and dimensions - processed in a heat treatment process involving incomplete austenitization. This is clear from the austenitization temperature provided in table 2, which is between Ac1 and Ac3, resulting in undissolved carbides. Austenitization is followed by oil quenching and tempering. Information on the microstructure and the mechanical properties is provided in table 2.
  • the synergistic action of the steel grade (and especially the carbon content and the presence of alloying elements) and the specific fine microstructure comprising undissolved carbides results in excellent mechanical properties of the steel wires numbers 3 - 8.
  • the high yield strength is especially noticed.
  • Steel wires 3 - 8 can be processed into card clothing that has high resistance to fatigue, as the risk of permanent deformation of the hooks of the card clothing is strongly reduced.
  • the tips of the hooks have high abrasion resistance after hardening the tips of the legs of the hooks.
  • the surprising combination of the resistance to fatigue and the abrasion resistance of the tips results in flexible card clothing with high lifetime.
  • the amount of residual austenite in the microstructure of steel wire number 3 has been measured by means of XRD and was less than 1 % by volume.
  • the steel wires of the specific examples all comprise vanadium.
  • the beneficial effects of the invention can be achieved by selecting other alloying elements from the group of vanadium, titanium, niobium, molybdenum, tungsten and boron; when at least containing the minimum quantities as claimed.
  • Vanadium, titanium, niobium, molybdenum and tungsten are alloying elements forming stable carbides that limit austenite grain growth during austenitization and create improved hardenability. Boron on the other hand leads mainly to improved hardenability. These actions are very important towards improvement of lifetime of the tips and of the base of the hooks in flexible card clothing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Cette invention concerne un fil d'acier ayant un diamètre équivalent compris entre 0,2 et 0,7 mm. Le fil d'acier a une composition comprenant entre 0,7 et 1,1 % en poids de carbone; entre 0,5 et 1,2 % en poids de manganèse; entre 0,05 et 0,5 % en poids de silicium, et comprend en outre moins de 0,4 % en poids de chrome; moins de 0,05 % en poids de phosphore; moins de 0,05 % en poids de soufre; moins de 0,2 % en poids de cuivre; et moins de 0,2 % en poids de nickel. Le fil d'acier comprend au moins un élément d'alliage, choisi dans le groupe constitué par le vanadium, le titane, le niobium, le molybdène, le tungstène et le bore. Quand ledit élément d'alliage est choisi dans le groupe constitué par le vanadium, le titane, le niobium, le molybdène et le tungstène, sa teneur est comprise entre 0,02 et 0,2 % en poids. Quand l'élément d'alliage est le bore, la teneur en bore est d'au moins 0 001 % en poids. La composition de fil d'acier comprend en outre des impuretés inévitables, le reste étant du fer. L'acier obtenu a une microstructure martensitique et la microstructure du fil d'acier comprend entre 1 et 10 % en volume de carbures non dissous.
EP18737585.2A 2017-07-21 2018-07-04 Fil en acier pour garniture de cardes flexible Active EP3655556B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2017093841 2017-07-21
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WO2024083497A1 (fr) * 2022-10-21 2024-04-25 Nv Bekaert Sa Fil d'acier allongé revêtu de zinc pour vêtement de cardage souple

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SE543422C2 (en) * 2019-06-07 2021-01-12 Voestalpine Prec Strip Ab Steel strip for flapper valves
CN110669981B (zh) * 2019-10-02 2021-07-16 江苏省沙钢钢铁研究院有限公司 一种钒硼复合微合金化帘线钢盘条及其生产方法
CN112899583B (zh) * 2020-12-30 2022-03-18 江阴市钧益特种钢丝科技有限公司 一种高弹性高镍合金针布钢线材及其制备方法

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JP2791537B2 (ja) * 1993-12-22 1998-08-27 金井 宏之 トップ針布
JPH0835125A (ja) 1994-07-22 1996-02-06 Kanai Hiroaki 高強度針布線
US6269522B1 (en) 1998-11-24 2001-08-07 Graf & Cie Ag Method of operating a card and a card flat for carrying out the method
DE102006016832B4 (de) * 2006-04-07 2021-04-15 Trützschler GmbH & Co Kommanditgesellschaft Garniturträger für einen Kardendeckelbelag
EP2334456B1 (fr) * 2008-09-12 2012-05-09 L. Klein AG Articles en acier de décolletage sans plomb destinés à la métallurgie des poudres, et leur procédé de fabrication
EP3250719B1 (fr) * 2015-01-30 2019-09-04 NV Bekaert SA Fil d'acier à haute résistance à la traction
WO2017059578A1 (fr) * 2015-10-09 2017-04-13 Nv Bekaert Sa Fil d'acier allongé à revêtement métallique pour résistance à la corrosion
CN105838981A (zh) 2016-05-20 2016-08-10 金轮针布(江苏)有限公司 一种针布用钢

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WO2024083497A1 (fr) * 2022-10-21 2024-04-25 Nv Bekaert Sa Fil d'acier allongé revêtu de zinc pour vêtement de cardage souple

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