Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof

A technology for overhead cables and steel cores, applied in the field of steel wires for steel cores of ultra-high-strength overhead cables, which can solve the problems of steel toughness damage, work hardening with V content, etc., and achieve the goal of reducing damage, reducing pollution, and reducing heat treatment processes Effect

Inactive Publication Date: 2013-04-03
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the prior art, in order to increase the initial strength of the high-carbon steel wire rod 82B, 0.15-0.25% Cr, 0.04-0.15% V and a small amount of Ti are generally added alone or in combination in addition to the basic components of 82B. It can increase the strength of steel, but Cr is a medium carbide forming element, and Cr carbide is the smallest carbide, which can be evenly distributed in steel, so that the steel has high strength and hardness while refining the structure And the distribution is uniform, which improves the plasticity and toughness of steel; while the solubility of V carbides in steel is relatively high, it is often used to improve the strength of high-carbon steel. cause some damages

Method used

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  • Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof
  • Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof
  • Steel wire for aerial cable steel core with spanning degree not smaller than 3500m and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Production of G4A 7 / 3.60 (1×7-10.08mm) galvanized steel strand:

[0030] The composition and weight percentage of the produced wire rod are C: 0.80%, Si: 0.22%, Mn: 0.75%, Cr: 0.35%, V: 0.035%, S: 0.01%, P: 0.0098%, and the rest is Fe and unavoidable impurities;

[0031] The diameter D of the wire rod is 11mm, the initial tensile strength is 1195MPa, the reduction of area is 34%, the grain size is 8 grades, the sorbite content is 90%, the diameter d of the steel wire is 3.60mm, and the steel wire is galvanized. The speed v is 36m / min, and the number of pressing passes n is 10 times.

[0032] Its production steps:

[0033] 1) Produce a wire rod with a diameter D of 11.0mm and an initial tensile strength of 1195MPa;

[0034] 2) Carry out conventional pickling and phosphating treatment, and the phosphating film layer on the surface of the wire rod after phosphating treatment is uniform;

[0035] 3) Pulling, the number of drawing passes n is 10 times, the ave...

Embodiment 2

[0041] Embodiment 2: Production of G4A φ3.60mm galvanized steel wire:

[0042] The composition and weight percentage of the produced wire rod are C: 0.81%, Si: 0.24%, Mn: 0.82%, Cr: 0.30%, V: 0.030%, S: 0.008%, P: 0.009%, and the rest is Fe and unavoidable impurities;

[0043] The diameter D of the wire rod is 10.0mm, the initial tensile strength is 1205MPa, the reduction of area is 32%, the grain size is 8 grades, the sorbite content is 90%, the diameter d of the steel wire is 3.60mm, and the steel wire is galvanized. The running speed v is 36m / min, and the number of pressing passes n is 9 times.

[0044] Its production steps:

[0045] 1) Produce a wire rod with a diameter D of 10.0mm and an initial tensile strength of 1205MPa;

[0046] 2) Carry out conventional pickling and phosphating treatment, and the phosphating film layer on the surface of the wire rod after phosphating treatment is uniform;

[0047] 3) Pulling, the number of drawing passes n is 9 times, the average...

Embodiment 3

[0052] Example 3: Production of G4A 37 / 3.14 (1×37-22mm) galvanized steel strand:

[0053] The composition and weight percentage of the produced wire rod are C: 0.81%, Si: 0.25%, Mn: 0.80%, Cr: 0.32%, V: 0.025, S: 0.00951%, P: 0.0097%, and the rest are Fe and unavoidable impurities;

[0054] The diameter D of the wire rod is 10.0mm, the initial tensile strength is 1200MPa, the reduction of area is 33%, the grain size is 8 grades, the sorbite content is 90%, the diameter d of the steel wire is 3.14mm, and the steel wire is galvanized. The running speed v is 38m / min, and the number of pressing passes n is 10 times.

[0055] Its production steps:

[0056] 1) Produce a wire rod with a diameter of 10.0mm and an initial tensile strength of 1200MPa;

[0057] 2) Carry out conventional pickling and phosphating treatment, and the phosphating film layer on the surface of the wire rod after phosphating treatment is uniform;

[0058] 3) Drawing is carried out, the drawing pass n is 10 t...

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Abstract

The invention discloses a steel wire for an aerial cable steel core with a spanning degree not smaller than 3500m and a production method thereof. The steel wire comprises the following components in percentage by weight in terms of content: 0.79-0.84% of C, 0.70-0.90% of Mn, 0.15-0.30% of Si, not more than 0.01% of P, not more than 0.01% of S, 0.28-0.35% of Cr, and 0.015-0.035% of V. The production method comprises the steps of: selecting a wire rod with the diameter being 9-11mm and the tensile strength not lower than 1180MPa; carrying out acid washing and phosphating treatment on the wire rod; drawing the wire rod; and galvanizing the drawn wire rod to obtain a steel wire for later use. According to the galvanized steel wire with phi being 2.70-4.60mm, produced according to the invention, the wire rod is directly drawn without undergoing lead hardening treatment, so that the pollution to the environment is reduced, thermal treatment procedures such as the lead hardening and the like as well as corresponding equipment maintenance works are reduced; and in addition, under the condition of simple components, the steel wire is at least 1900MPa in tensile strength, at least 1600MPa in 1% elongation stress and at least 20 in torsion number.

Description

technical field [0001] The invention relates to a wire rod and a production method thereof, in particular to a steel wire for the steel core of an overhead cable with a span ≥ 3,500 meters and a production method thereof, which is suitable for producing ultra-high-strength overhead cable bearings with a diameter of φ2.7-4.0mm Steel core with steel wire. Background technique [0002] The specific performance indicators of ultra-high-strength galvanized steel wire are: tensile strength ≥ 1770MPa, 1% elongation stress ≥ 1550MPa, elongation ≥ 2.5%, twisting times ≥ 14, and the quality of the zinc layer conforms to the A grade of GB / T3428-2002 . Ultra-high-strength galvanized steel wire can be used to make ultra-high-strength galvanized steel strands with structures of 1×7, 1×19 and 1×37. [0003] As the UHV and long-span power transmission technology with energy-saving and environmental protection features become increasingly mature and popularized, the requirements for galvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D8/06C23C28/00
Inventor 李建华吴东明童秋胜张光新詹学明胡昕周祖江杨植宝阮琴
Owner 武钢集团有限公司
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