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A production method of high-strength large-elongation aluminum-clad steel wire

An aluminum-clad steel wire, production method technology, applied in the direction of rod/rod/wire/strip conductor, power cable for overhead applications, and reducing the size of conductor/cable, etc. The problems of low strength and elongation of zinc steel wire can achieve the effect of improving tensile strength, improving tensile strength and area shrinkage index, good corrosion resistance and electrical conductivity

Inactive Publication Date: 2018-12-11
HUBEI LONGSKY COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and elongation of galvanized steel wire are lower than that of galvanized steel wire, which cannot meet the requirements of completely replacing galvanized steel wire.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] With grade LB20 (refer to the definition of aluminum-clad steel grades in the GB / T 17937-2009 standard, LB20 means that the electrical conductivity is 20.3% IACS, and IACS is the international standard for annealed copper), with a diameter of Φ2.80 ultra-high strength and large elongation aluminum Take steel wire production as an example:

[0034] 1. Raw materials: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00;

[0035] 2. Pre-drawing: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00 is cold-drawn to obtain a steel wire with a diameter of Φ7.20;

[0036] 3. Heat treatment: Pass the pre-drawn steel wire through a heat treatment furnace for lead bath quenching treatment, heat treatment line temperature: 950-960°C, lead bath temperature: 450-460°C, furnace time: 100s. Then carry out on-line pickling in industrial synthetic phosphoric acid with a concentration of 3-5%, remove the surface scale, and obtain a heat-treated semi-finishe...

Embodiment 2

[0043] 1. Raw materials: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00;

[0044] 2. Pre-drawing: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00 is cold-drawn to obtain a steel wire with a diameter of Φ7.20;

[0045] 3. Heat treatment: The heat treatment method is the same as that in Example 1. During the heat treatment process, the heat treatment line temperature is 970-980°C, the lead bath temperature is 470-480°C, and the time in the furnace is 180s. The concentration of industrially synthesized phosphoric acid is 6-8%.

[0046] 4. Coating: The coating method is the same as in Example 1, and the heating temperature of the mold cavity is 400-450° C.

[0047] 5. Wire drawing: the drawing process is the same as in Example 1.

[0048] After testing, the strength of the aluminum-clad steel wire produced by the method of Example 2 is 1812 MPa, the elongation after breaking is 3.3%, and the twist is 41 turns.

Embodiment 3

[0050] 1. Raw materials: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00;

[0051] 2. Pre-drawing: S87A high-carbon steel hot-rolled wire rod with a diameter of Φ8.00 is cold-drawn to obtain a steel wire with a diameter of Φ7.20;

[0052] 3. Heat treatment: The heat treatment method is the same as that in Example 1. During the heat treatment process, the heat treatment line temperature is 990-1000°C, the lead bath temperature is 490-500°C, and the time in the furnace is 200s. The concentration of industrially synthesized phosphoric acid is 9-10%.

[0053] 4. Coating: The coating method is the same as in Example 1, and the heating temperature of the mold cavity is 400-450° C.

[0054] 5. Wire drawing: the drawing process is the same as in Example 1.

[0055] After testing, the strength of the aluminum-clad steel wire produced by the method of Example 3 is 1840 MPa, the elongation after breaking is 3.5%, and it is twisted 43 times.

[0056] Therefore, the ...

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Abstract

The invention relates to a production method of high-strength large-elongation aluminum-clad steel wire, comprising the following steps: 1) hot-drawing high-carbon steel wire rod to different wire diameters through cold drawing; 2) carry out lead bath quenching treatment on that steel wire, and carry out on-line pickling and rinsing to obtain a pretreated steel wire; 3) uniformly cover an outer lay of that pretreated steel wire with a layer of aluminum to form a cladding blank; 4) that coat blank is drawn into a super-high-strength aluminum clad steel wire semi-finished product through multiple passes of a bimetal synchronous deformation wire draw machine; 5) age that semi-finished product of the high-strength aluminum-clad steel wire through a high-temperature box. The method of the invention changes the traditional lead bath heat treatment temperature, The tensile strength of Al-clad steel wire is increased by multi-pass synchronous deformation and drawing with small compression ratio, and the elongation of Al-clad steel wire is increased by high temperature aging treatment. The ultimate tensile strength >= 1700 MPa, elongation >= 3. 0%, and other indexes are in accordance with the requirements of Al-clad steel GB / T17937-2009 standard, thereby meeting the requirements of high strength and high elongation and meeting the application requirements.

Description

technical field [0001] The invention relates to the technical field of wire and cable conductors, in particular to a production method of aluminum-clad steel wires with high strength and large elongation. Background technique [0002] Aluminum-clad steel wire is a bimetallic wire composed of a round steel wire that is uniformly and continuously tightly coated with a layer of pure aluminum. It has the characteristics of high strength, heat resistance, corrosion resistance, large capacity, and low loss. Therefore, It has irreplaceable advantages in long-distance power transmission. At present, aluminum-clad steel products are widely used in electric power, bridges, and railways. In terms of electricity, there are: aluminum-clad steel-cored aluminum strands, aluminum-clad steel strands, optical fiber composite overhead ground wires (OPGW), pre-twisted wire fittings, etc.; bridges and railways include: high-strength anti-oxidation load-bearing suspension cables, etc. The curre...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B9/00H01B5/02H01B1/02
CPCH01B13/0006H01B1/02H01B5/02H01B9/008H01B13/0016
Inventor 杨民新杜子武裴雷雷高忠亮刘连红周丰彭龙
Owner HUBEI LONGSKY COMM TECH
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