CN103785704A - Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance - Google Patents
Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance Download PDFInfo
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Abstract
The invention discloses a method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance. The method comprises the following steps: (1) dry-drawing until the steel wires are 1.8-2.2mm long; (2) performing sorbitizing heat treatment; (3) performing pinchbeck alloy electroplating; and (4) wet-drawing until the steel wires are 0.20-0.40 mm long. Ultra-high-strength steel wires produced according to the method has high strength, good toughness, torsion-exfoliation resistance and excellent fatigue resistance, the 100d of the steel wire has the torsion number being not less than 30/360 degrees, and the fracture after torsion test is an even fracture, that is to say, torsion without exfoliation can be realized. Based on the method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance, the torsion exfoliation of the steel wires is effectively controlled, the requirements of the steel wires on strength and toughness are met, and the requirements for manufacturing ultra-high-strength steel cords for low rolling resistance tyres are well met.
Description
Technical field
The present invention relates to the preparation method of low rolling resistance tyre extra-high tensile steel steel for tyre cord silk.
Background technology
In running car, energy can be consumed by various resistance, wherein approximately 20% is consumed by tire drag.In the case, within 2009, European Union has promulgated two tire new legislations, and EC661/2009 and EC1222/2009(are hereinafter to be referred as tire tag method), the resistance to rolling to tire, wet grabbing property of road surface and path link are crossed and are had higher requirement.The tire tag method that has started to carry out in November, 2012 will further promote the exploitation of low rolling resistance tyre.
The intensity that market steel steel for tyre cord silk to the demand driving of lightweight tire more improves constantly, its intensity also by regular tenacity, high strength to superhigh intensity and very high strength future development, by adopting more high-intensity steel cord, can guarantee that tire is the in the situation that of some strength, not only can reduce the consumption of steel cord in cord, also can reduce the consumption of sizing material simultaneously, realize the deadweight that reduces tire, thereby reduce the resistance to rolling of tire, reach saving oil consumption, and reduce the object of CO2 emission.The strength grade of steel wire in steel cord, according to the requirement in ISO17832:2009, the intensity of individual wire can define (volume unit: MPa by following formula; Steel wire diameter unit: mm).
Regular tenacity: tensile strength of wire value=3275-2000* steel wire diameter value;
High strength: tensile strength of wire value=3650-2000* steel wire diameter value;
Superhigh intensity: tensile strength of wire value=4000-2000* steel wire diameter value;
Extra High Strength: tensile strength of wire value=4350-2000* steel wire diameter value;
The steel wire with lamellar pearlitic structrure had both possessed higher work hardening rate, after drawing deformation, can obtain higher intensity, had again good plasticity simultaneously, was unlikely to fracture in the drawing process of aximal deformation value.The basic skills that realizes steel wire high strength is to utilize the work hardening of cold-drawn, in guaranteeing intensity of steel wire, also needs to guarantee its toughness.The toughness of steel wire is generally to evaluate with the number of torsions in torsion test and breaking morphology thereof.Intensity is high and torsional fracture that toughness is high is even fracture, sees Fig. 1.Intensity is high and the initial period of monofilament torsional deflection in whole length that toughness is low has just produced the lobe of layering along drawing side, sees Fig. 2, hampers the development of steel wire high strength.Reverse the steel wire of layering in the twisting of follow-up merchant wire is shaped, as steel cord, the frequent fracture of wire phenomenon of twisting yet can occur, impact is produced and is normally carried out.Even fracture of wire not in twisting process, the finished steel cord fatigue behaviour of twisting is also lower, brings hidden danger to the safe handling of tire, and reversing layering has become restriction high-carbon steel wire and realize the biggest obstacle of high strength.
Summary of the invention
The object of the present invention is to provide the preparation method of the extra high strength steel wire of a kind of anti-torsion layering and excelling in fatigue property.
The present invention is achieved by the following technical solution:
The preparation method of the extra high strength steel wire of anti-torsion layering and excelling in fatigue property, comprises the following steps:
1., dry drawing: de-scaling, pickling, painting boron, oven dry are carried out in the hot rolling wire surface that is 0.90%-1.20% by Φ 5.5mm carbon content, and then dry drawing is to 1.80mm-2.2mm;
2., sorbitizing heat treatment: the drawing wires by step in 1. carries out sorbitizing heat treatment;
3., electro-coppering kirsite: the wire rod by step in 2. carries out after first copper facing zinc-plated, and carries out thermal diffusion at 500 ℃-600 ℃;
4., wet drawing: the wire rod by step in is 3. 96%-98% by diameter total draught, and the progressively wet finished product steel wire that is pulled to of classification of distribution method of little compressible after high before adopting; The diameter d of finished product steel wire is 0.20mm-0.40mm.
The tensile strength of described finished product steel wire is not less than (4350-2000 × d) MPa.
Described step 2. in, the wire rod tensile strength after sorbitizing heat treatment is not less than that 1350+6 × { ([C] %-0.90%) × 100} Mpa, sorbite rate is not less than 92%.
Described step 3. in, the thickness of coating of wire material electroplating ormolu is 0.5-2.5 μ m, in coating, copper content is 61%-70%, all the other are Zn.
Described step 4. in, wet draw the rate control of last passage wire rod below 2%.In the forming process of steel wire, make steel wire in the end small drawing deformation occur when a time, this is conducive to improve the stress state of steel wire inside, thereby improves the twisting property of (cold-)drawn (steel)wire, the fatigue life of improving steel wire.
The present invention compared with prior art has following beneficial effect:
Extra high strength steel wire intensity prepared by the present invention is high, good toughness, anti-torsion layering and excelling in fatigue property, and 100d number of torsions is not less than 30 times/360 °, and the fracture reversing after test is even fracture, reverses not stratified.This preparation method has effectively controlled the torsion layering of steel wire, guarantees to meet requirement of strength and the toughness reguirements of steel wire.In the forming process of steel wire, make steel wire that small drawing deformation in the end occur when a time, this is conducive to improve the stress state of steel wire inside, thereby improve the twisting property of (cold-)drawn (steel)wire, improve the fatigue life of steel wire, met preferably the manufacture requirement of low rolling resistance tyre extra-high tensile steel cord.
Accompanying drawing explanation
Fig. 1 is the photo that wire rod reverses test even fracture;
Fig. 2 is the photo that wire rod reverses test Layered Fracture.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment mono-: shown in Figure 1, the preparation method of the extra high strength steel wire of a kind of anti-torsion layering and excelling in fatigue property, comprises the following steps:
1., dry drawing: select the hot rolling wire that Φ 5.5mm carbon content is 0.92%, mechanical descaling, pickling, painting boron, oven dry are carried out in Φ 5.5mm hot rolling wire surface, then dry drawing is to 2.02mm;
2., sorbitizing heat treatment: the drawing wires by step in 1. carries out sorbitizing heat treatment, and after heat treatment, wire rod intensity is 1380MPa, sorbitic rate 96%;
3., electro-coppering kirsite: the wire rod by step in 2. carries out after first copper facing zinc-plated, and carries out thermal diffusion at 500 ℃-600 ℃, wire rod thickness of coating 2.0 μ m, in coating, Cu content is 62.5%, Zn content is 37.5%;
4., wet drawing: the wire rod by step in is 3. 97.3% by total draught, and after high before adopting the distribution method of little compressible progressively classification is wet is pulled to finished product steel wire, last Reduction per draft is 1.8%; Finished steel filament diameter d is 0.33mm, tensile strength 3800MPa, and steel wire 100d number of torsions is 35 times/360 °, the fracture after torsion is even fracture.
Embodiment bis-: shown in Figure 1, the preparation method of the extra high strength steel wire of a kind of anti-torsion layering and excelling in fatigue property, comprises the following steps:
1., dry drawing: select the hot rolling wire that Φ 5.5mm carbon content is 0.97%, mechanical descaling, pickling, painting boron, oven dry are carried out in Φ 5.5mm hot rolling wire surface, then dry drawing is to 2.00mm;
2., sorbitizing heat treatment: the drawing wires by step in 1. carries out sorbitizing heat treatment, and after heat treatment, wire rod intensity is 1430MPa, sorbitic rate 94%;
3., electro-coppering kirsite: the wire rod by step in 2. carries out after first copper facing zinc-plated, and carries out thermal diffusion at 500 ℃-600 ℃, wire rod thickness of coating 1.9 μ m, in coating, Cu content is 61.5%, Zn content is 38.5%;
4., wet drawing: the wire rod by step in is 3. 96.9% by total draught, and after high before adopting the distribution method of little compressible progressively classification is wet is pulled to finished product steel wire, last Reduction per draft is 1.5%; Finished steel filament diameter d is 0.35mm, tensile strength 3920MPa, and steel wire 100d number of torsions is 33 times/360 °, the fracture after torsion is even fracture.
Embodiment is just for the ease of understanding technical scheme of the present invention; do not form limiting the scope of the invention; every interior any simple modification, equivalent variations and modification of perhaps according to technical spirit of the present invention, above scheme being done that does not depart from technical solution of the present invention, within all still belonging to protection domain of the present invention.
Claims (5)
1. the preparation method of the extra high strength steel wire of anti-torsion layering and excelling in fatigue property, comprises the following steps:
1., dry drawing: de-scaling, pickling, painting boron, oven dry are carried out in the hot rolling wire surface that is 0.90%-1.20% by Φ 5.5mm carbon content, and then dry drawing is to 1.80mm-2.2mm;
2., sorbitizing heat treatment: the drawing wires by step in 1. carries out sorbitizing heat treatment;
3., electro-coppering kirsite: the wire rod by step in 2. carries out after first copper facing zinc-plated, and carries out thermal diffusion at 500 ℃-600 ℃;
4., wet drawing: the wire rod by step in is 3. 96%-98% by diameter total draught, and the progressively wet finished product steel wire that is pulled to of classification of distribution method of little compressible after high before adopting; The diameter d of finished product steel wire is 0.20mm-0.40mm.
2. the preparation method of the extra high strength steel wire of anti-torsion layering according to claim 1 and excelling in fatigue property, is characterized in that: the tensile strength of described finished product steel wire is not less than (4350-2000 × d) MPa.
3. the preparation method of the extra high strength steel wire of anti-torsion layering according to claim 1 and excelling in fatigue property, it is characterized in that: described step 2. in, wire rod tensile strength after sorbitizing heat treatment is not less than that 1350+6 × { ([C] %-0.90%) × 100} Mpa, sorbite rate is not less than 92%.
4. the preparation method of the extra high strength steel wire of anti-torsion layering according to claim 1 and excelling in fatigue property, it is characterized in that: described step 3. in, the thickness of coating of wire material electroplating ormolu is 0.5-2.5 μ m, and in coating, copper content is 61%-70%, and all the other are Zn.
5. the preparation method of the extra high strength steel wire of anti-torsion layering according to claim 1 and excelling in fatigue property, is characterized in that: described step 4. in, wet draw the rate control of last passage wire rod below 2%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104357991A (en) * | 2014-10-30 | 2015-02-18 | 江苏兴达钢帘线股份有限公司 | Manufacturing method for monofilament steel cord |
| CN105537313A (en) * | 2015-12-28 | 2016-05-04 | 江苏鑫海铜业有限公司 | Manufacturing method for copper wire |
| CN108339860A (en) * | 2018-02-08 | 2018-07-31 | 江苏兴达钢帘线股份有限公司 | It is a kind of outer around with wet drawing monofilament drawing speed method for improving |
| CN108755208A (en) * | 2018-07-13 | 2018-11-06 | 镇江耐丝新型材料有限公司 | A kind of steel cord structure of huge high intensity and preparation method thereof |
| CN110785510A (en) * | 2017-06-22 | 2020-02-11 | 贝卡尔特公司 | Wire with a steel core and a metal alloy coating |
| CN112439805A (en) * | 2020-11-09 | 2021-03-05 | 江苏宝钢精密钢丝有限公司 | Preparation method of ultrahigh-strength diamond wire bus |
| CN115673010A (en) * | 2022-12-30 | 2023-02-03 | 天津市新天钢中兴盛达有限公司 | Manufacturing method of corrosion-resistant steel strand with thick zinc layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357991A (en) * | 2014-10-30 | 2015-02-18 | 江苏兴达钢帘线股份有限公司 | Manufacturing method for monofilament steel cord |
| CN105537313A (en) * | 2015-12-28 | 2016-05-04 | 江苏鑫海铜业有限公司 | Manufacturing method for copper wire |
| CN110785510A (en) * | 2017-06-22 | 2020-02-11 | 贝卡尔特公司 | Wire with a steel core and a metal alloy coating |
| CN110785510B (en) * | 2017-06-22 | 2021-12-31 | 贝卡尔特公司 | Wire with a steel core and a metal alloy coating |
| CN108339860A (en) * | 2018-02-08 | 2018-07-31 | 江苏兴达钢帘线股份有限公司 | It is a kind of outer around with wet drawing monofilament drawing speed method for improving |
| CN108755208A (en) * | 2018-07-13 | 2018-11-06 | 镇江耐丝新型材料有限公司 | A kind of steel cord structure of huge high intensity and preparation method thereof |
| CN112439805A (en) * | 2020-11-09 | 2021-03-05 | 江苏宝钢精密钢丝有限公司 | Preparation method of ultrahigh-strength diamond wire bus |
| CN115673010A (en) * | 2022-12-30 | 2023-02-03 | 天津市新天钢中兴盛达有限公司 | Manufacturing method of corrosion-resistant steel strand with thick zinc layer |
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