Steel wire strands, typically high-carbon or stainless steel with protective coatings, are the preferred material for reinforcing and fixing optical cables due to their high tensile strength, flexibility, and corrosion resistance.

Key Characteristics

Tensile Strength: Steel wire strands provide the primary mechanical support for optical cables, with tensile strengths typically ranging from 1600 to 2000 MPa for high-quality carbon steel. This ensures the cable can withstand installation tension, environmental forces, and long-term stress without breaking or deforming . Flexibility: Strands are made by twisting multiple wires together (e.g., 1×3, 1×7, 1×19 configurations), which enhances flexibility while maintaining strength. This allows optical cables to adapt to complex terrain and reduces internal fiber damage during bending . Corrosion Resistance: Outdoor optical cables require steel wires that resist moisture, acid, alkali, and other environmental factors. Common treatments include hot-dip galvanizing, zinc or zinc-aluminum coatings, and plastic coatings. Stainless steel wires are also used for lashing or aerial applications, providing high ductility and corrosion resistance .

Types of Steel Wire for Optical Cables

1. High-Carbon Steel Wire: Used as the reinforcing core, meeting standards like GB699. It can be galvanized or phosphated to prevent corrosion. Galvanized wires require a uniform zinc layer without cracks or bare spots .
2. Steel Wire Strands: Multiple wires twisted together, commonly 1×7 for optical cable reinforcement. Strands are graded by nominal tensile strength (e.g., 1270, 1370, 1470, 1570 MPa) and must maintain structural integrity under load .
3. Stainless Steel Wire: Often used for lashing or messenger wires in aerial deployments. Stainless steel provides high ductility, corrosion resistance, and is suitable for harsh environments, including coastal areas .

Applications

• Aerial Cables: Steel messenger strands support the weight of suspended optical cables and resist environmental stress. Lashing wires secure the cable to the messenger strand .
• Armored Cables: High-carbon steel wires provide axial strength and impact resistance between the inner and outer sheaths .
• Long-Distance and 5G Networks: Steel wire cores ensure stable transmission by protecting fragile optical fibers from mechanical stress .

Summary

For optical cable reinforcement, high-carbon steel wire strands with galvanization or stainless steel wires are the most reliable choices. They combine high tensile strength, flexibility, and corrosion resistance, making them suitable for aerial, underground, and armored cable installations. Selecting the appropriate strand configuration, coating, and material grade ensures long-term durability and optimal performance of optical cable systems .