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Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance

A fatigue performance and ultra-high-strength technology, applied in the field of preparation of ultra-high-strength steel wires with anti-torsion delamination and excellent fatigue performance, can solve the problem of low fatigue performance of steel cords, hidden dangers of safe use of tires, hindering high-strength steel wires, etc. problem, to achieve the effect of high strength, increased fatigue life, and improved stress state

Active Publication Date: 2014-05-14
JIANGSU XINGDA STEEL TYPE CORD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the initial stage of torsional deformation of the monofilament with high strength and low toughness, layered longitudinal cracks are produced along the drawing side, see figure 2 , hindering the development of high-strength steel wire
The twisted and layered steel wires will also frequently break during the twisting and forming of subsequent steel wire products, such as steel cords, which will affect the normal production
Even if the twisting process is continuous, the fatigue performance of the twisted finished steel cord is relatively low, which brings hidden dangers to the safe use of tires. Torsion delamination has become the biggest obstacle restricting the high-strength of high-carbon steel wire

Method used

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  • Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance
  • Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one: see figure 1 As shown, a method for preparing an ultra-high-strength steel wire with anti-torsion delamination and excellent fatigue performance, comprising the following steps:

[0026] ①. Dry drawing: select Φ5.5mm hot-rolled wire with a carbon content of 0.92%, mechanically descale the surface of Φ5.5mm hot-rolled wire, pickle, boron coat, dry, and then dry-draw to 2.02mm;

[0027] ②. Sorbitization heat treatment: Sorbitization heat treatment is performed on the drawn wire in step ①. After heat treatment, the strength of the wire is 1380MPa, and the sorbitization rate is 96%;

[0028] ③. Copper-zinc alloy electroplating: The wire in step ② is first copper-plated and then galvanized, and thermally diffused at 500°C-600°C. The thickness of the wire coating is 2.0 μm, and the Cu content in the coating is 62.5%, and the Zn content is 37.5%;

[0029] ④. Wet drawing: the wire rod in step ③ is drawn according to the total compression rate of 97.3%, and the...

Embodiment 2

[0030] Embodiment two: see figure 1 As shown, a method for preparing an ultra-high-strength steel wire with anti-torsion delamination and excellent fatigue performance, comprising the following steps:

[0031] ①. Dry drawing: select Φ5.5mm hot-rolled wire with a carbon content of 0.97%, mechanically descale the surface of Φ5.5mm hot-rolled wire, pickle, boron-coat, dry, and then dry-draw to 2.00mm;

[0032] ②. Sorbitizing heat treatment: Sorbitizing the drawn wire in step ①. After heat treatment, the strength of the wire is 1430MPa, and the sorbitizing rate is 94%;

[0033] ③. Copper-zinc alloy electroplating: The wire in step ② is first copper-plated and then galvanized, and thermally diffused at 500°C-600°C. The thickness of the wire coating is 1.9 μm, and the Cu content in the coating is 61.5%, and the Zn content is 38.5%;

[0034] ④. Wet drawing: The wire rod in step ③ is drawn according to the total compression rate of 96.9%, and the distribution method of high front an...

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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 [0001] The invention relates to a method for preparing steel wires for ultra-high-strength steel cords for tires with low rolling resistance. Background technique [0002] Energy will be consumed by various resistances while the car is running, about 20% of which will be consumed by tire rolling resistance. Under such circumstances, in 2009 the European Union promulgated two new tire regulations, namely EC661 / 2009 and EC1222 / 2009 (hereinafter referred to as the tire labeling law), which put forward higher requirements for tire rolling resistance, wet road grip and road passing. requirements. The tire labeling law, which has been implemented since November 2012, will further promote the development of low rolling resistance tires. [0003] The market demand for lighter weight tires drives the strength of steel wire for steel cords to continuously increase, and its strength is also developing from ordinary strength and high strength to ultra-high strength and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C25D3/58C21D8/06
Inventor 刘锦兰倪自飞姚利丽王威底华芳石荣珠
Owner JIANGSU XINGDA STEEL TYPE CORD
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