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Alloy steel core wire for overhead conductor and preparation method thereof

An overhead wire and alloy steel technology, which is applied in the field of alloy steel core wire for overhead wire and its preparation, to achieve the effects of high tensile strength, high electrical conductivity, and low cost

Active Publication Date: 2021-05-14
STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide an alloy steel core wire for overhead wires and a preparation method thereof, so as to solve the problems existing in common steel core materials for overhead wires

Method used

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  • Alloy steel core wire for overhead conductor and preparation method thereof

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preparation example Construction

[0022] The preparation method of the above-mentioned alloy steel core wire for overhead conductors comprises the following steps:

[0023] (1) Raw material preparation: nickel plate dehydrogenation annealing, drying of all raw materials;

[0024] (2) Vacuum smelting: Add other alloying elements after melting iron to melt them all;

[0025] (3) Electroslag refining: Refining at 1400℃~1600℃ for 1.0~2.0h, pouring into electroslag ingot;

[0026] (4) Electroslag remelting: Electroslag remelting is carried out, and billet ingots are obtained through furnace loading, arc ignition, slagging, smelting, feeding, and cooling;

[0027] (5) High-temperature forging: forging after heat preservation at 1100-1200°C for 1.0-3.0 hours, wherein, the initial forging temperature is 1100-1250°C, and the final forging temperature is 900-1100°C;

[0028] (6) Hot-rolling forming: after heat preservation at 1050-1150°C for 1.0-3.0 hours, hot-rolling and forming, the initial rolling temperature is 10...

Embodiment 1

[0031] Alloy steel core wire for overhead conductors, by weight, consists of the following components: C: 0.2wt%, Si: 0.1wt%, Mn: 0.2wt%, P: 0.006wt%, S: 0.006wt%, Ni: 35wt%, Mo: 0.5wt%, V: 0.5wt%, Cr: 0.5wt%, Y: 1.5wt%, the balance is Fe and unavoidable other impurities.

[0032] The preparation method of the above-mentioned alloy steel core wire for overhead conductors comprises the following steps:

[0033] (1) Raw material preparation: nickel plate dehydrogenation annealing, drying of all raw materials;

[0034] (2) Vacuum smelting: Add other alloying elements after melting iron to melt them all;

[0035] (3) Electroslag refining: Refining at 1450°C for 2 hours, pouring into electroslag ingots;

[0036] (4) Electroslag remelting: Electroslag remelting is carried out, and billet ingots are obtained through furnace loading, arc ignition, slagging, smelting, feeding, and cooling;

[0037] (5) High temperature forging: forging after 1150°C heat preservation for 2 hours, the...

Embodiment 2

[0041] Alloy steel core wire for overhead conductors consists of the following components by weight: C: 0.18wt%, Si: 0.1wt%, Mn: 0.1wt%, P: 0.006wt%, S: 0.005wt%, Ni: 34wt%, Mo: 0.6wt%, V: 0.8wt%, Cr: 0.8wt%, Y: 1.0wt%, the balance is Fe and unavoidable other impurities.

[0042] The preparation method of the above-mentioned alloy steel core wire for overhead conductors comprises the following steps:

[0043] (1) Raw material preparation: nickel plate dehydrogenation annealing, drying of all raw materials;

[0044] (2) Vacuum smelting: Add other alloying elements after melting iron to melt them all;

[0045] (3) Electroslag refining: Refining at 1600°C for 1 hour, pouring into electroslag ingots;

[0046] (4) Electroslag remelting: Electroslag remelting is carried out, and billet ingots are obtained through furnace loading, arc ignition, slagging, smelting, feeding, and cooling;

[0047] (5) High-temperature forging: forging after 1200°C for 2 hours, the initial forging tem...

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Abstract

The invention discloses an alloy steel core wire for an overhead wire and a preparation method thereof, wherein the alloy steel core wire for an overhead wire is composed of the following components by weight: C: 0.02-0.2 wt%, Si: 0.02 ~0.15wt%, Mn: 0.02~0.2wt%, P≤0.008wt%, S≤0.008wt%, Ni: 30~35wt%, Mo: 0.1~1wt%, V: 0.05~2wt%, Cr: 0.05~ 2wt%, Y: 0.05-2wt%, the balance is Fe and other unavoidable impurities. The alloy steel core wire for overhead wire has excellent comprehensive performance, tensile strength ≥ 1250MPa, elongation ≥ 2.0%, linear expansion coefficient ≤ 2.5×10 ‑6 / ° C (20 ~ 230 ° C), conductivity ≥ 16% IACS, using relatively low-cost Cr, Y elements to partially replace expensive Ni, Mo elements, reducing the cost of material preparation.

Description

technical field [0001] The invention relates to an alloy steel core wire for an overhead wire, in particular to a wire with a tensile strength ≥ 1250 MPa, an elongation ≥ 2.0%, and a linear expansion coefficient ≤ 2.5×10 -6 / °C (20-230°C), alloy steel core wire for overhead conductors with electrical conductivity ≥ 16% IACS and a preparation method thereof. Background technique [0002] Ordinary steel core materials are used for overhead wires, which have high thermal expansion coefficient, large sag, and low conductivity. They cannot operate for a long time at high temperatures, resulting in a low maximum allowable continuous operating temperature for ordinary steel-cored aluminum stranded wires, generally below 70°C to 90°C. Its use is limited to some extent. Invar core wire material is made of iron-nickel (nickel accounts for about 36%~40%) alloy material, which has the characteristics of small thermal expansion coefficient, low thermal conductivity, good toughness and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46B21C37/04C21D8/06C22C33/04
CPCB21C37/04C21D8/065C22C33/04C22C38/005C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 祝志祥胡博杨长龙张强陈保安许超冯柳李悦悦王炜陈新丁一潘学东王晓芳张宏志李海龙齐亮
Owner STATE GRID LIAONING ELECTRIC POWER CO LTD SHENYANG POWER
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