Standard for Steel Wire for Optical Cable Reinforcement
The standard for steel wire used as tension members in optical fiber cables is GB/T 24202-2021, specifying technical requirements, classifications, and testing methods for galvanized and phosphated carbon steel wires.
Scope and Application
GB/T 24202-2021 governs carbon steel wires used as tension members in optical fiber cables, including both galvanized and phosphated round wires. It defines terms, classification, labeling, dimensions, allowable deviations, technical requirements, inspection methods, packaging, marking, transportation, storage, warranty, and quality certification. While primarily for optical fiber cables, the standard can also serve as a reference for other cable tension applications .
Classification and Strength Grades
Steel wires are classified by nominal tensile strength into seven grades: 1370, 1570, 1770, 1960, 2160, 2350, and 2550 MPa. Surface treatments include phosphating or zinc coating, with galvanized wires further divided into three levels: AB, C, and E, based on coating weight . Marking examples:
- Phosphated wire, 1.40 mm diameter, 1960 MPa: Phosphated steel wire for optical fiber cable 1.40-1960-GB/T 24202-2021
- Galvanized wire, 1.60 mm diameter, 1570 MPa, Grade E zinc: Galvanized steel wire for optical cable 1.60-1570-E-GB/T 24202-2021 .
Technical Requirements
The standard specifies:
- Wire diameter measurement using a micrometer with 0.001 mm resolution.
- Torsion and reverse bending tests to ensure mechanical performance.
- Free ring diameter and camber height requirements for wire flexibility.
- Zinc ingot quality for galvanization and phosphating treatment for corrosion resistance.
- Nominal diameter range: 0.35 mm to 3.0 mm, accommodating various cable designs .
Inspection and Testing
GB/T 24202-2021 references several normative standards for testing:
- Tensile testing (GB/T 228.1)
- Reverse bend test (GB/T 238)
- Simple torsion test (GB/T 239.1)
- Wrapping test (GB/T 2976)
- Modulus of elasticity and Poisson's ratio (GB/T 22315)
- Coating mass determination (GB/T 1839, GB/T 9792) These tests ensure the wire meets mechanical and surface quality requirements for reliable optical cable reinforcement .
Packaging and Quality Assurance
The standard also defines spool types (Type 250 and Type 400), packaging, marking, and quality certificates to ensure traceability and compliance during transportation and storage .
Summary
GB/T 24202-2021 provides a comprehensive framework for the production, testing, and application of steel wires in optical fiber cables, ensuring mechanical strength, corrosion resistance, and consistent quality. It is the authoritative reference for manufacturers, designers, and quality inspectors in the optical cable industry .
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