Stainless straight wire for spring wire cloth

Abstract

The present application provides a stainless steel wire. The tensile strength of the stainless steel wire is greater than 1950 MPa, and the camber of the stainless steel wire is less than 60 mm / m. The stainless steel wire has high tensile strength and improved flatness. The stainless steel wire is used for spring wire cloth.

Description

Technical Field

[0001] This invention relates to a stainless steel straight wire and a method for manufacturing the same. It also relates to a flexible card clothing comprising needles made of stainless steel straight wire. Background Technology

[0002] In textile production, the carding process arranges fibers into a uniform state, meaning uniform density and thickness, and removes impurities. This can be accomplished using elastic cardioid fabric.

[0003] Elastic card fabric, also known as elastic needle array, consists of small needles set within a base of elastic, multi-layered fabric. These needles are made of steel wire bent into a U-shape with knees. During the carding process, the needles in elastic card fabric bend under load and return to their original position when the load is removed. The steel wire used in elastic card fabric is typically very stiff.

[0004] The steel wires used to make elastic carding cloth must have a certain degree of corrosion resistance. Once the steel needles are corroded, the iron oxide on the surface of the needles reduces their strength, making them weaker and unable to provide sufficient carding strength. This can lead to needle failure during the carding process.

[0005] Therefore, steel wire with good corrosion resistance is needed to manufacture elastic needle cloth.

[0006] WO0231239 discloses an elastic card cloth in which the carding needles are formed of metal wire, particularly stainless steel wire. Stainless steel wire has strong corrosion resistance. However, some problems exist in practical applications, such as the needles easily bending during the carding process, resulting in a short lifespan of the elastic card cloth, or the needles failing to embed into the fabric substrate, or the needles being embedded outside the desired position. Summary of the Invention

[0007] The main objective of this invention is to solve the problems of the prior art.

[0008] Another object of the present invention is to provide a stainless steel straight wire with high tensile strength for use in elastic needle cloth.

[0009] A third objective of this invention is to provide a method for manufacturing the stainless steel wire of this invention.

[0010] According to one object of the present invention, a stainless steel wire is provided, wherein the tensile strength of the stainless steel wire is greater than 1950 MPa, and the arc height of the stainless steel wire is less than 60 mm / m. The arc height unit "mm / m" refers to the arc height measured using a 1m gauge length.

[0011] This invention simultaneously improves the straightness and tensile strength of stainless steel wire. Due to the improved straightness, needles made from this stainless steel wire are easily and accurately embedded into the fabric substrate during the production of elastic needle cloth. Because of the high tensile strength, the needles do not bend during the carding process, thereby increasing the service life of the elastic needle cloth. This invention achieves straight stainless steel wire with high tensile strength.

[0012] Preferably, the arc height of the stainless steel wire is less than 40 mm / m. More preferably, the arc height of the stainless steel wire ranges from 2 to 30 mm / m. The lower the arc height, the better the straightness of the stainless steel wire.

[0013] Preferably, the stainless steel wire has a high tensile strength of greater than 2000 MPa. More preferably, the tensile strength of the stainless steel wire is greater than 2100 MPa. The tensile strength of the stainless steel wire can even reach 3200 MPa.

[0014] According to the present invention, the yield ratio of the stainless steel wire, that is, the ratio of yield strength to tensile strength, is greater than 80%, which improves the flexibility of the needles made of stainless steel wire, thereby reducing or even preventing the bending of the needles during combing.

[0015] Stainless steel wire can be round or shaped, meaning it has a circular or irregular cross-section, such as a triangular, flat, or quadrilateral cross-section. Stainless steel wire includes round wire with a diameter less than 1 mm, or shaped wire with an equivalent diameter less than 1 mm.

[0016] This invention relates to stainless steel wire. The stainless steel wire has a chromium content of at least 12% (by weight).

[0017] The stainless steel wire is austenitic stainless steel wire, martensitic stainless steel wire, duplex stainless steel wire, or precipitation-hardening stainless steel wire. The austenitic stainless steel wire contains 0.01%-0.15% carbon, 7.5%-10% manganese, 17%-19% chromium, 4%-6% nickel, 0.01%-0.9% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen. Preferably, the austenitic stainless steel wire contains 0.01%-0.15% carbon, 0.5%-2.0% manganese, 16%-19% chromium, 6%-9.5% nickel, 0.01%-0.8% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen. In another embodiment, austenitic stainless steel wire contains 0.01%-0.08% carbon, 0.7%-2.0% manganese, 17%-19% chromium, 8%-10% nickel, 0.01%-0.8% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen. Precipitation-hardening stainless steel wire contains 0.05%-0.10% carbon, 0.1%-1.5% manganese, 14%-18% chromium, 3%-8.5% nickel, 0.01%-0.8% molybdenum, 0.7%-1.5% aluminum, and 0.01%-0.39% nitrogen. Martensitic stainless steel wire contains less than 0.15% carbon, less than 1.0% manganese, 12.0-14.0% chromium, less than 1.0% nickel, and less than 0.3% molybdenum. The carbon content in duplex stainless steel wire is less than 0.03%, the manganese content is less than 2%, the chromium content is 21%-24.5%, the nickel content is 1.0%-6.5%, the molybdenum content is 0.05%-3.5%, and the nitrogen content is 0.08%-0.26%. All the above component contents are by weight percentage. The remaining components are common components found in austenitic stainless steel wire, martensitic stainless steel wire, duplex stainless steel wire, or precipitation-hardening stainless steel wire.

[0018] According to another object of the present invention, a method for manufacturing stainless steel wire is provided, the method comprising the following steps:

[0019] a) Draw the stainless steel wire to a predetermined diameter and tensile strength;

[0020] b) Straighten the stainless steel wire using a straightening machine;

[0021] c) Heat the stainless steel wire at a predetermined temperature of 450-1200°C for 20-30 seconds, with a heating rate of 5-10 seconds from room temperature to the predetermined temperature;

[0022] d) Winding stainless steel wire.

[0023] Preferably, the predetermined temperature in step c) is 650-1200°C. A higher predetermined heating temperature is advantageous for achieving a lower arc height stainless steel wire in a shorter heating time.

[0024] The heating temperature of the stainless steel wire can be adjusted according to its composition to optimize the effect.

[0025] The stainless steel wire of this invention is intended for use in elastic needle cloth or other existing applications of stainless steel wire. Detailed Implementation

[0026] Prepare austenitic stainless steel wire rods.

[0027] First, the stainless steel wire rod is cleaned by mechanical rust removal and / or chemical pickling in a nitric acid solution to remove oxides present on the surface. Then, a salt coating is applied to the stainless steel wire rod as a soap carrier. The stainless steel wire rod is then rinsed with water and dried. The dried stainless steel wire rod is then subjected to a first series of drawing operations to reduce the diameter until a first intermediate diameter is reached.

[0028] At this first intermediate diameter, the drawn stainless steel wire undergoes a first intermediate heat treatment. The stainless steel wire can then undergo further mechanical deformation.

[0029] Subsequently, in the second diameter reduction step, the stainless steel wire is further drawn from the first intermediate diameter to the second intermediate diameter. At this second intermediate diameter, the stainless steel wire undergoes a second heat treatment.

[0030] Subsequently, in the third diameter reduction step, the stainless steel wire is further drawn from the second intermediate diameter until the final diameter is reached. The final diameter is less than 1 mm. Besides round stainless steel wire, stainless steel wire can also be non-circular shapes produced by rolling, drawing, or profile drawing, such as flat, rectangular, biconvex, triangular, oval, or rhomboid shapes. Non-circular wire, also known as shaped wire, has an equivalent diameter of less than 1 mm. The tensile strength of the final diameter stainless steel wire exceeds 1950 MPa.

[0031] The stainless steel wire is then straightened using a straightening machine to obtain straight stainless steel wire. The straightening machine can be an existing straightening machine used for on-site wire straightening. The stainless steel wire is then heated at a predetermined temperature of 450°C to 1200°C for 20 to 30 seconds, with a heating rate of 5 to 10 seconds from room temperature (0-35°C) to the predetermined temperature. Heating can be carried out in a heating furnace. This heating rate reduces the impact of heating on the tensile strength of the stainless steel wire while maintaining its straightness. Therefore, this heating rate helps to consolidate the tensile strength of the drawn stainless steel wire and improves its straightness after straightening. Even if the stainless steel wire is eventually wound onto a spool and rewound for further processing, such as processing elastic needle cloth, the straightness of the stainless steel wire is essentially unaffected or eliminated. If the heating rate is too fast, the final arc height of the stainless steel wire will increase; if the heating rate is too slow, the final tensile strength of the stainless steel wire will decrease. Additionally, if the heating time is too long, exceeding 30 seconds, the final tensile strength of the stainless steel wire will decrease.

[0032] Finally, stainless steel wires, which are several thousand meters or even tens of thousands of meters long, are wound onto a spool or coil.

[0033] The tensile strength of the stainless steel wire is greater than 1950 MPa, and the arc height is less than 60 mm / m.

[0034] This invention provides a method for measuring the arc height of a stainless steel wire. The principle of measuring the arc height of a stainless steel wire is the same as that of the method for measuring the arc height of a wire rope described in GB / T 33159-2016. However, two measurement parameters of the arc height of the stainless steel wire differ from those in the method described in GB / T 33159-2016: First, the length between the two pins of the stainless steel wire arc height measuring device is 1000 mm, which is the gauge length. Therefore, the arc height value is recorded in "mm / m" for ease of understanding. Second, the length of the stainless steel wire sample is 1200 mm.

[0035] Table 1 summarizes the comparative data.

[0036] Table 1

[0037]

[0038] "Processing capability" refers to whether a needle made of stainless steel wire can be inserted into the fabric substrate at the required position, i.e., accurate insertion. Accurate insertion is considered "OK", otherwise it is considered "NOK".

[0039] "Elastic carding life" refers to the effective carding time of the elastic carding cloth. An effective carding time of at least 2880 hours is considered "OK", otherwise it is "NOK".

[0040] As can be clearly seen from Table 1, the stainless steel wire of the present invention has high tensile strength and improved straightness, and has better performance in terms of processing capability and elastic needle cloth life.

Claims

1. A stainless steel wire for use in elastic needle-like clothing, said stainless steel wire being wound on a spool, wherein, The stainless steel wire has a tensile strength greater than 1950 MPa, an arc height range of 2 to 30 mm / m, a yield ratio greater than 80%, and an arc height calculated according to the wire rope arc height measurement method described in GB / T33159-2016, wherein the gauge length is 1000 mm and the length of the stainless steel wire sample is 1200 mm.

2. The stainless steel wire according to claim 1, wherein, The tensile strength of the stainless steel wire is greater than 2000 MPa.

3. The stainless steel wire according to claim 2, wherein, The tensile strength of the stainless steel wire is greater than 2100 MPa.

4. The stainless steel wire according to claim 1, wherein, The stainless steel wire has a circular cross-section or an irregular cross-section.

5. The stainless steel wire according to claim 4, wherein, The stainless steel wire includes round stainless steel wire with a diameter of less than 1 mm, or shaped stainless steel wire with an equivalent diameter of less than 1 mm.

6. The stainless steel wire according to claim 4, wherein, The irregular cross-section is triangular or quadrilateral.

7. The stainless steel wire according to any one of claims 1-6, wherein, The stainless steel wire is austenitic stainless steel wire, martensitic stainless steel wire, duplex stainless steel wire, or precipitation hardening stainless steel wire.

8. The stainless steel wire according to claim 7, wherein, The austenitic stainless steel wire contains, by weight percentage, 0.01%-0.15% carbon, 7.5%-10% manganese, 17%-19% chromium, 4%-6% nickel, 0.01%-0.9% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen.

9. The stainless steel wire according to claim 7, wherein, The austenitic stainless steel wire contains, by weight percentage, 0.01%-0.15% carbon, 0.5%-2.0% manganese, 16%-19% chromium, 6%-9.5% nickel, 0.01%-0.8% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen.

10. The stainless steel wire according to claim 7, wherein, The austenitic stainless steel wire contains, by weight percentage, 0.01%-0.08% carbon, 0.7%-2.0% manganese, 17%-19% chromium, 8%-10% nickel, 0.01%-0.8% molybdenum, 0.1%-0.48% aluminum, and 0.01%-0.39% nitrogen.

11. The stainless steel wire according to claim 7, wherein, The precipitation-hardening stainless steel wire contains, by weight percentage, 0.05%-0.10% carbon, 0.1%-1.5% manganese, 14%-18% chromium, 3%-8.5% nickel, 0.01%-0.8% molybdenum, 0.7%-1.5% aluminum, and 0.01%-0.39% nitrogen.

12. A method for manufacturing stainless steel wire for elastic needle cloth according to any one of claims 1-11, comprising the following steps: a) Draw the stainless steel wire to a predetermined diameter and tensile strength, then b) Straighten the stainless steel wire using a straightening machine, and then c) Heating the stainless steel wire at a predetermined temperature of 450-1200°C for 20-30 seconds, with a heating rate of 5-10 seconds from room temperature to the predetermined temperature, and then... d) Wind the stainless steel wire.

13. The method for manufacturing stainless steel wire according to claim 12, wherein, The predetermined temperature in step c) is 650-1200℃.

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