Production method of large-elongation aluminum clad steel wire

A technology of aluminum-clad steel wire and production method, which is applied in the direction of improving process efficiency, improving energy efficiency, reducing the size of conductors/cables, etc. problems, to achieve the effect of improving production efficiency

Inactive Publication Date: 2019-08-16
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of this invention is to provide a production method of large elongation aluminum-clad steel wire, which adopts the induction heating aging treatment process, without reducing the hardness of the aluminum layer of the aluminum-clad steel wire, to improve production efficiency and aluminum-clad steel wire The elongation rate solves the problem of low elongation rate of aluminum-clad steel wire after cold drawing, and the softening of the aluminum layer after low temperature and long-term aging treatment, which cannot meet the production requirements of the stranded wire. It improves production efficiency and obtains comprehensive Aluminum-clad steel wire products with excellent performance

Method used

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  • Production method of large-elongation aluminum clad steel wire

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Effect test

Embodiment 1

[0028] Example 1: Production Aluminum-clad steel wire with high strength and large elongation, the specific steps are as follows:

[0029] 1) Derusting and pre-drawing of raw materials: The SWRH87B high-carbon hot-rolled wire rod with a diameter of 5.5mm is mechanically derusted on the surface of the wire rod by repeated bending, and drawn into a diameter by cold drawing abrasive tools. 4.7mm steel wire;

[0030] 2) Heat treatment: the pre-drawn steel wire is austenitized through a coal-fired muffle furnace, the temperature is set at 960°C, and the austenitization holding time is 120s; and isothermally quenched in a lead bath at a temperature of 550°C. The holding time is 65s, and the obtained steel wire has a volume fraction of sorbite structure above 90%;

[0031] 3) pickling: the steel wire with sorbite structure obtained in step 2) is pickled with an industrial synthetic hydrochloric acid solution with a mass concentration of 18% to 25%, to remove the residual lead slag...

Embodiment 2

[0035] Example 2: Production Aluminum-clad steel wire with high strength and large elongation, the specific steps are as follows:

[0036] 1) Derusting and pre-drawing of raw materials: The SWRH87B high-carbon hot-rolled wire rod with a diameter of 5.5mm is mechanically derusted on the surface of the wire rod by repeated bending, and drawn into a diameter by cold drawing abrasive tools. 4.8mm steel wire;

[0037] 2) Heat treatment: the pre-drawn steel wire is austenitized through a coal-fired muffle furnace, the temperature is set at 980°C, and the austenitization holding time is 90s; and isothermally quenched in a lead bath at a temperature of 550°C. The holding time is 70s, and the obtained steel wire has a volume fraction of sorbite structure above 90%;

[0038] 3) pickling: the steel wire with sorbite structure obtained in step 2) is pickled with an industrial synthetic hydrochloric acid solution with a mass concentration of 18% to 25%, to remove the residual lead slag ...

Embodiment 3

[0042] Embodiment 3: As a comparative example of Embodiment 1, it is prepared by low temperature and long time aging treatment Aluminum-clad steel wire, the specific steps are as follows:

[0043] 1) Derusting and pre-drawing of raw materials: The SWRH87B high-carbon hot-rolled wire rod with a diameter of 5.5mm is mechanically derusted on the surface of the wire rod by repeated bending, and drawn into a diameter by cold drawing abrasive tools. 4.7mm steel wire;

[0044]2) Heat treatment: the pre-drawn steel wire is austenitized through a coal-fired muffle furnace, the temperature is set at 970°C, and the austenitization holding time is 100s; and it is austenitized through a lead bath at a temperature of 550°C. The holding time is 65s, and the obtained steel wire has a volume fraction of sorbite structure above 90%;

[0045] 3) pickling: the steel wire with sorbite structure obtained in step 2) is pickled with an industrial synthetic hydrochloric acid solution with a mass co...

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Abstract

The invention provides a production method of a large-elongation aluminum clad steel wire. The production process comprises the following steps of (1) derusting and drawing a high-carbon hot rolled wire rod to form a steel wire with the required wire diameter; (2) conducting austenitizing on the steel wire and conducting isothermal transformation through a lead bath to obtain the steel wire with the sorbite structure; (3) conducting online acid pickling on the steel wire with the sorbite structure to remove lead slag and oxide skin on the surface layer to obtain the steel wire with the clean surface; (4) cladding an aluminum layer on the surface layer of the steel wire with the clean surface through continuous extrusion cladding treatment to obtain a clad blank; (5) drawing the clad blankto be deformed to form the aluminum clad steel wire; and (6) conducing ageing treatment on the aluminum clad steel wire through an induction heating device. Through the production method, the production efficiency is high; and the problem that the hardness of an aluminum layer of the aluminum clad steel wire subjected to ageing treatment is reduced, and the aluminum clad steel wire is scratched inthe subsequent stranding process is solved. Compared with a traditional method that it needs to take 4-24 h of conduct heating and heat preservation during low-temperature long-time ageing treatment,the production method provided by the invention has the advantage that the induction heating device only needs 0.1-2.0 min to conduct online ageing treatment.

Description

technical field [0001] The invention relates to the technical field of cable conductors, in particular to a production method of aluminum-clad steel wire with a large elongation rate. Background technique [0002] Aluminum-clad steel wire is a bimetal composite material coated with a layer of aluminum on the steel core material. It is often used in overhead line products, including conductor reinforcement cores, ground wires, transmission lines, etc., and can also be used as load-bearing cables or pull wires. Compared with galvanized steel wire, aluminum-clad steel wire has the following advantages: (1) better corrosion resistance, (2) smaller specific gravity, (3) good electrical conductivity, (4) more combinations of aluminum layer thickness and steel wire strength , has great design flexibility, and can meet the service requirements in special environments such as salt spray areas, large spans, and heavy ice areas. [0003] However, compared with galvanized steel wire, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C21D1/42C21D1/48C22F1/04C23G3/02H01B13/00
CPCB21C37/042C21D1/42C21D1/48C22F1/04C23G3/02H01B13/00H01B13/0006H01B13/0016Y02P10/25
Inventor 涂益友徐文静张锐黄羚惠岳超华蒋建清
Owner SOUTHEAST UNIV
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