WO2022243000A1 - A straight stainless steel wire for flexible card clothing - Google Patents

A straight stainless steel wire for flexible card clothing Download PDF

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Publication number
WO2022243000A1
WO2022243000A1 PCT/EP2022/061298 EP2022061298W WO2022243000A1 WO 2022243000 A1 WO2022243000 A1 WO 2022243000A1 EP 2022061298 W EP2022061298 W EP 2022061298W WO 2022243000 A1 WO2022243000 A1 WO 2022243000A1
Authority
WO
WIPO (PCT)
Prior art keywords
stainless steel
steel wire
tensile strength
card clothing
flexible card
Prior art date
Application number
PCT/EP2022/061298
Other languages
French (fr)
Inventor
Xiaojiang Liu
Li Shen
Yanli Zhang
Original Assignee
Nv Bekaert 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 Nv Bekaert Sa filed Critical Nv Bekaert Sa
Priority to EP22727753.0A priority Critical patent/EP4341453A1/en
Priority to CN202280035283.6A priority patent/CN117295828A/en
Priority to BR112023024045A priority patent/BR112023024045A2/en
Publication of WO2022243000A1 publication Critical patent/WO2022243000A1/en

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Classifications

    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/18—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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C19/00—Devices for straightening wire or like work combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G1/00—Making needles used for performing operations
    • 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
    • C21D2211/001—Austenite
    • 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
    • C21D2211/005—Ferrite
    • 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
    • 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
    • D01G15/88—Card clothing; Manufacture thereof not otherwise provided for formed from metal sheets or strips

Definitions

  • the invention relates to a straight stainless steel wire and its manufacturing method.
  • the invention also relates to a flexible card clothing comprising the needles made of the straight stainless steel wire.
  • a carding process is for arranging the fibres in a uniform state, i.e. uniform density and uniform thickness, and removing impurities. This can be done by means of flexible card clothing.
  • Flexible card clothing i.e. flexible fillet
  • small needles which are set into resilient and multi-ply fabric foundation.
  • the small needles are made of steel wires bent into a U shape and provided with a knee. During the carding process, the needles of the flexible card clothing bend when being subjected to a load and return to their original position when the load disappears.
  • the steel wires for the flexible card clothing are usually very hard.
  • the steel wire for making a flexible card clothing is required to have a certain corrosion resistance.
  • the strength of the steel needles is reduced because of the iron oxides on the surface of the steel needles, so that the steel needles are weakened and can’t provide the sufficient strength for carding, and this may cause the failure of the needles during the carding process.
  • WO0231239 discloses a flexible card clothing, wherein the carding needles are formed from a metal wire, especially stainless steel wire.
  • the stainless steel wire provides a strong performance on corrosion resistance.
  • the needles are easy to be bent during the carding process so that the lifetime of the flexible card clothing is very short, or the needles are not possible to be embedded into the fabric foundation or the needles are embedded out of the desired position. Disclosure of Invention
  • the primary object of the invention is to solve the problem of the prior arts.
  • Another object of the invention is to provide a straight stainless steel wire with high tensile strength for flexible card clothing.
  • a third object of the invention is to provide a method for making the invention stainless steel wire.
  • a stainless steel wire is provided, the stainless steel wire has a tensile strength of more than 1950MPa, and the stainless steel wire has an arc height of less than 60mm/m.
  • the unit of arc height “mm/m” means the arc height is measured with a gauge length of 1m.
  • the invention improves both the straightness and the tensile strength of the stainless steel wire.
  • the needles made of the invention stainless steel wire are easy to be accurately embedded into the fabric foundation during the production of the flexible card clothing.
  • the invention realizes a straight stainless steel wire with high tensile strength.
  • the stainless steel wire has an arc height of less than 40mm/m. More preferably, the stainless steel wire has an arc height ranging from 2 to 30 mm/m. The lower the arc height value, the better the straightness of the stainless steel wire.
  • the stainless steel wire has a high tensile strength of more than 2000MPa. More preferably, the stainless steel wire has tensile strength of more than 2100MPa. Even the stainless steel wire has a tensile strength up to 3200MPa.
  • the stainless steel wire has a yield ratio, i.e. the ratio of yield strength to tensile strength, of more than 80%, and this improves the flexibility of the needles made of stainless steel wire and thereby reduces or even prevents the bending of the needles during the carding.
  • the stainless steel wire is a circular wire or a shaped wire, i.e. the stainless steel wire has a circular cross-section or a shaped cross-section such as triangular, flat or quadrangular cross-section.
  • the stainless steel wire has a diameter of less than 1 mm for circular stainless steel wire or an equivalent diameter of less than 1mm for shaped stainless steel wire.
  • the present invention is relating to the stainless steel wire.
  • the stainless steel wire has a chromium of at least 12% in weight.
  • the stainless steel wire is an austenitic stainless steel wire, a martensitic stainless steel wire, a duplex stainless steel wire or a precipitation hardening stainless steel wire.
  • the austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 7.5%-10%, chromium of 17%-19%, nickel of 4%-6%, molybdenum of 0.01 %-0.9%, aluminium of
  • the austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 0.5%-2.0%, chromium of 16%-19%, nickel of 6%-9.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%.
  • the austenitic stainless steel wire comprises carbon of 0.01%-0.08%, manganese of 0.7%-2.0%, chromium of 17%-19%, nickel of 8%-10%, molybdenum of 0.01%-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%.
  • the precipitation hardening stainless steel wire comprises carbon of 0.05%-0.10%, manganese of 0.1 %-1.5%, chromium of 14%-18%, nickel of 3%-8.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.7%-1.5% and nitrogen of 0.01 %-0.39%.
  • the martensitic stainless steel wire comprises carbon lower than 0.15%, manganese lower than 1.0%, chromium of 12.0-14.0%, nickel lower than 1.0% and molybdenum lower than 0.3%.
  • the duplex stainless steel wire comprises carbon lower than 0.03%, manganese lower than 2%, chromium of 21 %-24.5%, nickel of 1.0%-6.5%, molybdenum of 0.05%-3.5%, and nitrogen of 0.08%-0.26%.
  • the above amounts of the ingredient content are the percentage in weight.
  • the rest ingredients are the normal ingredients with the normal level for an austenitic stainless steel wire, a martensitic stainless steel wire, a duplex stainless steel wire or a precipitation hardening stainless steel wire.
  • a method for making a stainless steel wire comprises the following steps: a) drawing the stainless steel wire until a predetermined diameter and tensile strength; b) straightening the stainless steel wire by the straightener; c) heating the stainless steel wire at a predetermined temperature of 450 to 1200 °C for 20 to 30 seconds with a heating up speed of 5 to 10 seconds from room temperature to said predetermined temperature; d) taking up the stainless steel wire.
  • the predetermined temperature is 650-1200°C.
  • the higher predetermined temperature for heating will be beneficial for achieving a lower arc height of stainless steel wire within the short heating time.
  • the temperature for heating the stainless steel wire can be adjusted depending on the composition of the stainless steel wire to optimize the effect.
  • a use of the invention stainless steel wire is for the flexible card clothing or other existing applications of a stainless steel wire.
  • the stainless steel wire rod is firstly cleaned by mechanical descaling and / or by chemical pickling in a nitric acid solution in order to remove the oxides presenting on the surface.
  • a salt coating is then applied on the stainless steel wire rod as a soap carrier.
  • the stainless steel wire rod is then rinsed in water and is dried.
  • the dried stainless steel wire rod is then subjected to a first series of drawing operations in order to reduce the diameter until a first intermediate diameter.
  • the drawn stainless steel wire is subjected to a first intermediate heat treatment.
  • the stainless steel wire is then ready for further mechanical deformation.
  • the stainless steel wire is further drawn from the first intermediate diameter until a second intermediate diameter in a second number of diameter reduction steps. At this second intermediate diameter, the stainless steel wire is subjected to a second heat treatment. [26] Thereafter the stainless steel wire is further drawn from the second intermediate diameter until a final diameter in a third number of diameter reduction steps. The final diameter is less than 1 mm.
  • the stainless steel wire can also be a non circular shape made by rolling and drawing or by profile drawing, e.g. flat, rectangle, double convex, triangle, egg-shape or rhombus.
  • the non circular wire, i.e. the shaped wire has an equivalent diameter of less than 1 mm.
  • the stainless steel wire with a final diameter has a tensile strength of more than 1950MPa.
  • the stainless steel wire is subjected to a straightening process by the straightener to have a straight stainless steel wire.
  • the straightener could be the existing straightener for straightening the wire in the field.
  • the stainless steel wire is heated at a predetermined temperature of 450 to 1200°C for 20 to 30 seconds with a heating up speed of 5 to 10 seconds from room temperature, i.e.0-35°C, to the predetermined temperature.
  • the heating can be done by a heating furnace.
  • the heating up speed reduces the impact from heating to the tensile strength of the stainless steel wire while maintaining the straightness of the stainless steel wire, as thus, this heating up speed contributes to consolidate the tensile strength of the stainless steel wire after drawing and the straightness after straightening.
  • the straightness of the stainless steel wire is substantially not impacted or eliminated. If the heating up speed is too quick, the arc height of final stainless steel wire will be increased; and if the heating up speed is too slow, the tensile strength of the final stainless steel wire will be decreased. In addition, if heating time is too long, i.e., more than 30 seconds, the tensile strength of the final stainless steel wire will be decreased.
  • a stainless steel wire is taken up on a spool or a coil with a length more than several thousand meters or even more than ten thousand meters.
  • the stainless steel wire has a tensile strength of more than 1950MPa and an arc height of less than 60 mm/m.
  • the invention provides a measurement of the arc height of the stainless steel wire.
  • the principle of the measurement of the arc height of the stainless steel wire is the same as the principle of the arc height measurement method of steel cord as described in GB/T 33159-2016, while there are two parameters of the measurement of the arc height of the stainless steel wire different from the arc height measurement method of steel cord as described in GB/T 33159-2016: first, the length between the two pins of the stainless steel wire arc height measurement device is 1000mm, and this is the gauge length, and as thus the arc height value is recorded with a unit of “mm/m” for easy understanding; second, the length of the stainless steel wire sample is 1200mm.
  • “Flexible card clothing lifetime” means the effective carding time of a flexible card clothing. The effective carding time of at least 2880 hours is deemed as “OK”, otherwise is “NOK”.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

:A stainless steel wire is provided. The stainless steel wire has a tensile strength of more than 1950MPa, and the stainless steel wire has an arc height of less than 60 mm/m. The invention stainless steel wire has a higher tensile strength and an improved straightness. The stainless steel wire is for flexible card clothing.

Description

Title A straight stainless steel wire for flexible card clothing
Description
Technical Field
[1] The invention relates to a straight stainless steel wire and its manufacturing method. The invention also relates to a flexible card clothing comprising the needles made of the straight stainless steel wire.
Background Art
[2] In the production of textiles, a carding process is for arranging the fibres in a uniform state, i.e. uniform density and uniform thickness, and removing impurities. This can be done by means of flexible card clothing.
[3] Flexible card clothing, i.e. flexible fillet, comprise small needles which are set into resilient and multi-ply fabric foundation. The small needles are made of steel wires bent into a U shape and provided with a knee. During the carding process, the needles of the flexible card clothing bend when being subjected to a load and return to their original position when the load disappears. The steel wires for the flexible card clothing are usually very hard.
[4] The steel wire for making a flexible card clothing is required to have a certain corrosion resistance. In case the steel needles are corroded, the strength of the steel needles is reduced because of the iron oxides on the surface of the steel needles, so that the steel needles are weakened and can’t provide the sufficient strength for carding, and this may cause the failure of the needles during the carding process.
[5] Therefore, a steel wire with good corrosion resistance is desired for making the flexible card clothing.
[6] WO0231239 discloses a flexible card clothing, wherein the carding needles are formed from a metal wire, especially stainless steel wire. The stainless steel wire provides a strong performance on corrosion resistance. However, there are some problems in practice, such as the needles are easy to be bent during the carding process so that the lifetime of the flexible card clothing is very short, or the needles are not possible to be embedded into the fabric foundation or the needles are embedded out of the desired position. Disclosure of Invention
[7] The primary object of the invention is to solve the problem of the prior arts.
[8] Another object of the invention is to provide a straight stainless steel wire with high tensile strength for flexible card clothing.
[9] A third object of the invention is to provide a method for making the invention stainless steel wire.
[10] According to one object of the invention a stainless steel wire is provided, the stainless steel wire has a tensile strength of more than 1950MPa, and the stainless steel wire has an arc height of less than 60mm/m. The unit of arc height “mm/m” means the arc height is measured with a gauge length of 1m.
[11] The invention improves both the straightness and the tensile strength of the stainless steel wire. With the improved straightness, the needles made of the invention stainless steel wire are easy to be accurately embedded into the fabric foundation during the production of the flexible card clothing. With the higher tensile strength, the needles will not bend during the carding process, and thereby the lifetime of the flexible card clothing is improved. The invention realizes a straight stainless steel wire with high tensile strength.
[12] Preferably, the stainless steel wire has an arc height of less than 40mm/m. More preferably, the stainless steel wire has an arc height ranging from 2 to 30 mm/m. The lower the arc height value, the better the straightness of the stainless steel wire.
[13] Preferably, the stainless steel wire has a high tensile strength of more than 2000MPa. More preferably, the stainless steel wire has tensile strength of more than 2100MPa. Even the stainless steel wire has a tensile strength up to 3200MPa.
[14] According to the present invention, the stainless steel wire has a yield ratio, i.e. the ratio of yield strength to tensile strength, of more than 80%, and this improves the flexibility of the needles made of stainless steel wire and thereby reduces or even prevents the bending of the needles during the carding.
[15] The stainless steel wire is a circular wire or a shaped wire, i.e. the stainless steel wire has a circular cross-section or a shaped cross-section such as triangular, flat or quadrangular cross-section. The stainless steel wire has a diameter of less than 1 mm for circular stainless steel wire or an equivalent diameter of less than 1mm for shaped stainless steel wire.
[16] The present invention is relating to the stainless steel wire. The stainless steel wire has a chromium of at least 12% in weight.
[17] The stainless steel wire is an austenitic stainless steel wire, a martensitic stainless steel wire, a duplex stainless steel wire or a precipitation hardening stainless steel wire. The austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 7.5%-10%, chromium of 17%-19%, nickel of 4%-6%, molybdenum of 0.01 %-0.9%, aluminium of
0.1%-0.48% and nitrogen of 0.01%-0.39%. Alternatively, the austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 0.5%-2.0%, chromium of 16%-19%, nickel of 6%-9.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%. As another embodiment, the austenitic stainless steel wire comprises carbon of 0.01%-0.08%, manganese of 0.7%-2.0%, chromium of 17%-19%, nickel of 8%-10%, molybdenum of 0.01%-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%. The precipitation hardening stainless steel wire comprises carbon of 0.05%-0.10%, manganese of 0.1 %-1.5%, chromium of 14%-18%, nickel of 3%-8.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.7%-1.5% and nitrogen of 0.01 %-0.39%. The martensitic stainless steel wire comprises carbon lower than 0.15%, manganese lower than 1.0%, chromium of 12.0-14.0%, nickel lower than 1.0% and molybdenum lower than 0.3%. The duplex stainless steel wire comprises carbon lower than 0.03%, manganese lower than 2%, chromium of 21 %-24.5%, nickel of 1.0%-6.5%, molybdenum of 0.05%-3.5%, and nitrogen of 0.08%-0.26%. The above amounts of the ingredient content are the percentage in weight. The rest ingredients are the normal ingredients with the normal level for an austenitic stainless steel wire, a martensitic stainless steel wire, a duplex stainless steel wire or a precipitation hardening stainless steel wire.
[18] According to another object of the invention, a method for making a stainless steel wire is provided, and the method comprises the following steps: a) drawing the stainless steel wire until a predetermined diameter and tensile strength; b) straightening the stainless steel wire by the straightener; c) heating the stainless steel wire at a predetermined temperature of 450 to 1200 °C for 20 to 30 seconds with a heating up speed of 5 to 10 seconds from room temperature to said predetermined temperature; d) taking up the stainless steel wire.
[19] Preferably, in step c) the predetermined temperature is 650-1200°C. The higher predetermined temperature for heating will be beneficial for achieving a lower arc height of stainless steel wire within the short heating time.
[20] The temperature for heating the stainless steel wire can be adjusted depending on the composition of the stainless steel wire to optimize the effect. [21] A use of the invention stainless steel wire is for the flexible card clothing or other existing applications of a stainless steel wire.
Mode(s) for Carrying Out the Invention
[22] Prepare an austenitic stainless steel wire rod.
[23] The stainless steel wire rod is firstly cleaned by mechanical descaling and / or by chemical pickling in a nitric acid solution in order to remove the oxides presenting on the surface. A salt coating is then applied on the stainless steel wire rod as a soap carrier. The stainless steel wire rod is then rinsed in water and is dried. The dried stainless steel wire rod is then subjected to a first series of drawing operations in order to reduce the diameter until a first intermediate diameter.
[24] At this first intermediate diameter, the drawn stainless steel wire is subjected to a first intermediate heat treatment. The stainless steel wire is then ready for further mechanical deformation.
[25] Thereafter the stainless steel wire is further drawn from the first intermediate diameter until a second intermediate diameter in a second number of diameter reduction steps. At this second intermediate diameter, the stainless steel wire is subjected to a second heat treatment. [26] Thereafter the stainless steel wire is further drawn from the second intermediate diameter until a final diameter in a third number of diameter reduction steps. The final diameter is less than 1 mm. More than the circular stainless steel wire, the stainless steel wire can also be a non circular shape made by rolling and drawing or by profile drawing, e.g. flat, rectangle, double convex, triangle, egg-shape or rhombus. The non circular wire, i.e. the shaped wire, has an equivalent diameter of less than 1 mm. The stainless steel wire with a final diameter has a tensile strength of more than 1950MPa.
[27] Then the stainless steel wire is subjected to a straightening process by the straightener to have a straight stainless steel wire. The straightener could be the existing straightener for straightening the wire in the field. And then the stainless steel wire is heated at a predetermined temperature of 450 to 1200°C for 20 to 30 seconds with a heating up speed of 5 to 10 seconds from room temperature, i.e.0-35°C, to the predetermined temperature. The heating can be done by a heating furnace. The heating up speed reduces the impact from heating to the tensile strength of the stainless steel wire while maintaining the straightness of the stainless steel wire, as thus, this heating up speed contributes to consolidate the tensile strength of the stainless steel wire after drawing and the straightness after straightening. Even though the stainless steel wire is finally wound on a spool and rewound for further processing such as processing a flexible card clothing, the straightness of the stainless steel wire is substantially not impacted or eliminated. If the heating up speed is too quick, the arc height of final stainless steel wire will be increased; and if the heating up speed is too slow, the tensile strength of the final stainless steel wire will be decreased. In addition, if heating time is too long, i.e., more than 30 seconds, the tensile strength of the final stainless steel wire will be decreased.
[28] Finally, a stainless steel wire is taken up on a spool or a coil with a length more than several thousand meters or even more than ten thousand meters.
[29] The stainless steel wire has a tensile strength of more than 1950MPa and an arc height of less than 60 mm/m. [30] The invention provides a measurement of the arc height of the stainless steel wire. The principle of the measurement of the arc height of the stainless steel wire is the same as the principle of the arc height measurement method of steel cord as described in GB/T 33159-2016, while there are two parameters of the measurement of the arc height of the stainless steel wire different from the arc height measurement method of steel cord as described in GB/T 33159-2016: first, the length between the two pins of the stainless steel wire arc height measurement device is 1000mm, and this is the gauge length, and as thus the arc height value is recorded with a unit of “mm/m” for easy understanding; second, the length of the stainless steel wire sample is 1200mm.
[31] Table 1 summarizes the comparison data.
[32] Table 1
Figure imgf000007_0001
[33] “Processing ability” means if the needles made of the stainless steel wire can be embedded into the fabric foundation in the desired position, i.e. accurate embedding. Accurate embedding is deemed as “OK”, otherwise is “NOK”.
[34] “Flexible card clothing lifetime” means the effective carding time of a flexible card clothing. The effective carding time of at least 2880 hours is deemed as “OK”, otherwise is “NOK”.
[35] From the table 1 , it is clear that the invention stainless steel wire with high tensile strength and improved straightness has better performance on the processing ability and the flexible card clothing’s lifetime.

Claims

Claims
1. A stainless steel wire, characterized in that said stainless steel wire has a tensile strength of more than 1950MPa, and said stainless steel wire has an arc height of less than 60 mm/m.
2. A stainless steel wire as claimed in claim 1 , characterized in that said stainless steel wire has an arc height of less than 40 mm/m.
3. A stainless steel wire as claimed in claim 2, characterized in that said stainless steel wire has an arc height ranging from 2 to 30 mm/m.
4. A stainless steel wire as claimed in any one of claims 1-3, characterized in that said stainless steel wire has a tensile strength of more than 2000 MPa or even more than 2100MPa.
5. A stainless steel wire as claimed in any one of claims 1-4, characterized in that said stainless steel wire has a yield ratio of more than 80%.
6. A stainless steel wire as claimed in any one of claims 1-5, characterized in that said stainless steel wire has a circular or a shaped cross-section.
7. A stainless steel wire as claimed in claim 6, characterized in that said stainless steel wire has a diameter of less than 1 mm for circular stainless steel wire or an equivalent diameter of less than 1 mm for shaped stainless steel wire.
8. A stainless steel wire as claimed in claim 6, characterized in that said shaped cross-section is triangle or quadrangle.
9. A stainless steel wire as claimed in any one of claims 1-8, characterized in that said stainless steel wire is an austenitic stainless steel wire, a martensitic stainless steel wire, a duplex stainless steel wire or a precipitation hardening stainless steel wire.
10. A stainless steel wire as claimed in claim 9, characterized in that said austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 7.5%- 10%, chromium of 17%-19%, nickel of 4%-6%, molybdenum of 0.01 %-0.9%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%.
11.A stainless steel wire as claimed in claim 9, characterized in that said austenitic stainless steel wire comprises carbon of 0.01 %-0.15%, manganese of 0.5%- 2.0%, chromium of 16%-19%, nickel of 6%-9.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%.
12. A stainless steel wire as claimed in claim 9, characterized in that said austenitic stainless steel wire comprises carbon of 0.01%-0.08%, manganese of 0.7%-
2.0%, chromium of 17%-19%, nickel of 8%-10%, molybdenum of 0.01%-0.8%, aluminium of 0.1%-0.48% and nitrogen of 0.01%-0.39%.
13. A stainless steel wire as claimed in claim 9, characterized in that said precipitation hardening stainless steel wire comprises carbon of 0.05%-0.10%, manganese of 0.1 %-1.5%, chromium of 14%-18%, nickel of 3%-8.5%, molybdenum of 0.01 %-0.8%, aluminium of 0.7%-1.5% and nitrogen of 0.01%- 0.39%.
14. A method for making a stainless steel wire as claimed in any one of claims 1- 13, comprises the following steps: a) drawing the stainless steel wire until a predetermined diameter and tensile strength; b) straightening the stainless steel wire by the straightener; c) heating the stainless steel wire at a predetermined temperature of 450 to 1200°C for 20 to 30 seconds with a heating up speed of 5 to 10 seconds from room temperature to said predetermined temperature; d) taking up the stainless steel wire.
15. A method for making a stainless steel wire as claimed in claim 14, characterized in that the predetermined temperature is 650-1200°C in step c).
16. A stainless steel wire as claimed in any one of claims 1 -13 is for flexible card clothing.
PCT/EP2022/061298 2021-05-21 2022-04-28 A straight stainless steel wire for flexible card clothing WO2022243000A1 (en)

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EP22727753.0A EP4341453A1 (en) 2021-05-21 2022-04-28 A straight stainless steel wire for flexible card clothing
CN202280035283.6A CN117295828A (en) 2021-05-21 2022-04-28 Stainless steel straight wire for elastic card clothing
BR112023024045A BR112023024045A2 (en) 2021-05-21 2022-04-28 STRAIGHT STAINLESS STEEL WIRE FOR FLEXIBLE CARDBOARD COATING

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JPS52111459A (en) * 1976-03-15 1977-09-19 Tanaka Precious Metal Ind Method of and apparatus for straightening wire material
JPH0211723A (en) * 1988-06-28 1990-01-16 Kanai Hiroyuki Manufacture of micro shaft
WO2002031239A1 (en) 2000-10-13 2002-04-18 James Holdsworth & Brothers Limited Card clothing
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JP2011214058A (en) * 2010-03-31 2011-10-27 Nippon Steel & Sumikin Stainless Steel Corp High-strength stainless steel wire, and method for producing the same
EP2832876A1 (en) * 2012-03-29 2015-02-04 Nippon Steel & Sumikin Stainless Steel Corporation High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same
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JPS52111459A (en) * 1976-03-15 1977-09-19 Tanaka Precious Metal Ind Method of and apparatus for straightening wire material
JPH0211723A (en) * 1988-06-28 1990-01-16 Kanai Hiroyuki Manufacture of micro shaft
WO2002031239A1 (en) 2000-10-13 2002-04-18 James Holdsworth & Brothers Limited Card clothing
JP2011092284A (en) * 2009-10-27 2011-05-12 Patentstra Co Ltd Medical treatment instrument, method for producing the medical treatment instrument, and assembly of medical endoscope and medical treatment instrument for endoscope
JP2011214058A (en) * 2010-03-31 2011-10-27 Nippon Steel & Sumikin Stainless Steel Corp High-strength stainless steel wire, and method for producing the same
EP2832876A1 (en) * 2012-03-29 2015-02-04 Nippon Steel & Sumikin Stainless Steel Corporation High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same
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