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Reinforcing Steel Aluminum Strand

Reinforcing steel-aluminum strand is a structured wire conforming to the GB1179-83 standard, composed of a combination of aluminum strands and a steel core. The aluminum strands provide conductive functionality, while the steel core supplies mechanical strength. Its nominal cross‑section range covers 10/2 mm² to 240/30 mm², structurally formed by wrapping 6 to 30 aluminum strands around 1 to 7 steel‑core strands, with single‑wire diameters of aluminum strands ranging from 1.50 mm to 4.72 mm and steel‑core strands from 1.50 mm to 3.60 mm. Reinforcing steel aluminum strand offers standardized technical parameters, including calculated cross‑sectional areas from 12.37 mm² to 275.96 mm², outer diameters from 4.50 mm to 21.60 mm, DC resistance not exceeding 2.706 Ω/km to 0.1410 Ω/km, calculated tensile strength from 4,012 N to 91,120 N, and calculated weights from 42.9 kg/km to 964.2 kg/km. The delivery length is generally less than 2,000 meters. It is mainly employed as a damping wire in hardware connection applications such as damping‑type end caps.

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Technical Advantages

Standardized Manufacturing: Strictly complies with the GB1179-83 national standard, ensuring uniform product specifications and reliable performance.

Rational Structure: Adopts a combined design of aluminum strands and steel core, where aluminum strands handle conductivity, and the steel core provides mechanical support, achieving an optimal balance of electrical performance and mechanical strength.

Complete Specifications: Offers a wide range of cross-sectional options from 10/2 mm² to 240/30 mm², meeting diverse current-carrying requirements.

Explicit Parameters: All technical parameters are standardized and clearly labeled, facilitating engineering selection and calculation.

Controlled Quality: Uniform delivery lengths enhance construction management and quality control.

 




Features

Materials Science
The steel-cored aluminum strand utilizes electrical-grade aluminum with purity ≥99.7%. Through precisely controlled annealing processes, its conductivity reaches over 61% IACS. The zinc coating weight on the galvanized steel core strictly complies with the standard of ≥300 g/m². The aluminum-steel composite structure achieves an optimal balance between mechanical and electrical performance through layered stranding technology.


Structural Mechanics
The product adopts scientifically designed stranding pitch ratios, ensuring uniform stress distribution across each layer. A strictly controlled pre-twisting process effectively prevents strand loosening. Under long-term operational loads, creep deformation is limited to within 0.05%, and structural reliability is validated through a 2-million-cycle wind-induced vibration fatigue test.


Electrical Performance
In addition to its DC resistance parameters, the product exhibits a measured skineffect coefficient below 1.05 under high-frequency conditions. The increase in AC resistance is controlled within 8%, and its short-circuit thermal capacity reaches 150 kA²·s. After 100 thermal cycles, the degradation in conductivity does not exceed 2%.


Environmental Adaptability
The product has been validated through rigorous environmental testing. Within a temperature range of -40 °C to +80 °C, its coefficient of thermal expansion remains stable. It can withstand an ice coating load of 30 mm, retains over 95% of its tensile strength after 5,000 hours of salt-spray testing, and shows no significant surface degradation after 5,000 hours of UV aging.

 

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About Us
Jiangsu Wopeng Power Technology Co., Ltd.
Jiangsu Wopeng Power Technology Co., Ltd.
Founded in June 2018, Jiangsu Wopeng Power Technology Co., Ltd. is a Custom Reinforcing Steel Aluminum Strand Manufacturers and OEM Reinforcing Steel Aluminum Strand Factory, it has rapidly grown into a specialized high-tech enterprise in the field of high and low voltage busbar systems.
We gather a professional team of industry experts, senior engineering and technical personnel, and experienced production specialists who have been engaged in power equipment technology for many years.
Our main products include copper & aluminum tube busbars, wind power tube busbars, intensive (compact) busbars and sliding contact line systems. We focus on the R&D and manufacturing of 0.4 kV–35 kV fully insulated enclosed tube busbars and low-voltage cast resin busway systems, providing reliable power transmission paths for power plants, substations, wind farms, rail transit and industrial facilities.
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Aluminum Alloy Tubular Bus Bar Industry knowledge

1. What is Reinforcing Steel Aluminum Strand?

Reinforcing Steel Aluminum Strand is a specialized composite conductor used in electrical engineering, particularly in overhead power transmission and distribution lines. It combines the high tensile strength of steel with the excellent electrical conductivity and corrosion resistance of aluminum. This unique composition makes it an ideal solution for long-span applications where mechanical strength is as critical as electrical performance.

Unlike standard conductors, this strand is engineered to withstand heavy mechanical loads, such as ice and wind, without significant elongation or breakage. The steel core provides the necessary structural integrity, while the outer aluminum layers carry the electrical current. This synergy allows power grids to operate efficiently over long distances, reducing the need for excessive support towers.

2. Primary Applications in Power Systems

The versatility of Reinforcing Steel Aluminum Strand makes it a staple in modern electrical infrastructure. Its applications range from high-voltage transmission to specific industrial uses.

(1) Overhead Transmission Lines

The most common use is in overhead transmission lines. In these scenarios, the conductor must support its own weight over long spans between towers. The steel reinforcement allows for longer span lengths compared to all-aluminum conductors, reducing the total number of towers required and lowering construction costs.

(2) High-Tension Distribution

For high-tension distribution lines, reliability is key. This strand offers a high strength-to-weight ratio, ensuring that lines remain taut and stable even under extreme weather conditions. This reduces the risk of line sagging, which can lead to short circuits or power outages.

(3) Ground Wires and Shield Wires

Beyond carrying current, these strands are often used as ground wires (or shield wires) at the top of transmission towers. Their high tensile strength protects the phase conductors below from lightning strikes, safely directing the surge to the ground.

3. Key Advantages and Technical Specifications

Choosing the right conductor is a balance between conductivity and mechanical durability. A reliable Reinforced aluminum strand supplier will provide products that meet strict international standards (such as ASTM or IEC).

The following table illustrates the typical performance characteristics of these strands compared to standard conductors:

Comparison of Conductor Properties
Property Reinforcing Steel Aluminum Strand Standard All-Aluminum Conductor
Tensile Strength High (Steel Core Support) Low to Moderate
Corrosion Resistance Excellent (Aluminum Cladding) Good
Span Capability Long Spans (>300m) Short to Medium Spans
Weight Moderate Light

Furthermore, the manufacturing process ensures that the bond between the steel and aluminum is robust, preventing galvanic corrosion. A reputable Reinforcing Steel Aluminum Strand manufacturer utilizes advanced drawing and stranding technologies to ensure consistent layering and diameter precision.

4. Installation and Maintenance Considerations

Proper installation is crucial for maximizing the lifespan of these conductors. While the material is durable, it requires specific handling techniques.

  • Tension Stringing: Because of the steel core, these strands can handle higher tension during installation. However, care must be taken not to exceed the elastic limit to prevent permanent deformation.
  • Connector Compatibility: When connecting to other grid components, compression connectors suitable for aluminum-to-steel transitions should be used to prevent oxidation and ensure low resistance.
  • Environmental Resistance: In coastal areas, the aluminum layer provides good resistance to salt spray, but regular inspections are recommended to check for any surface pitting or wear.

5. Frequently Asked Questions

Q1: What is the main benefit of using reinforcing steel in aluminum strands?
The primary benefit is increased tensile strength. The steel core allows the conductor to span longer distances between towers without sagging or breaking, which is essential for high-voltage transmission lines.
Q2: Can this strand be used in coastal environments?
Yes. The outer layers are typically made of high-purity aluminum or aluminum alloy, which offers excellent corrosion resistance against salt spray and atmospheric pollutants.
Q3: How does the conductivity compare to pure aluminum?
While the steel core does not conduct electricity well, the majority of the cross-section is aluminum. Therefore, it maintains high conductivity, typically around 52.5% to 61% IACS (International Annealed Copper Standard), which is sufficient for most transmission needs.
Q4: Where can I find a reliable manufacturer?
You should look for a certified Reinforcing Steel Aluminum Strand manufacturer who complies with international standards like ASTM B399 or IEC 61089 to ensure quality and safety.
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