Our PC Low Relaxation Pre-Stressed Steel Wire Production Line is designed for the continuous production of high-strength, low-relaxation PC wire used in prestressed concrete applications such as bridges, railway sleepers, poles, piles, and building structures.
The line integrates advanced drawing, heat treatment, and stress-relieving technology to ensure stable mechanical properties, uniform tensile strength, and excellent relaxation performance in compliance with international standards.
🔹 Main Application
Production of:
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4.8mm – 12.0mm PC low relaxation steel wire
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1470 MPa / 1570 MPa / 1670 MPa / 1770 MPa grade
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Smooth or indented PC wire
Applicable standards:
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ASTM A421
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BS 5896
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EN 10138
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GB/T 5223
🔹 Production Process
Typical process flow:
Pay-off → Straightening →First traction→ Heat Treatment → Cooling →Second traction→Grinding and feeding →Automatic shearing→ Automatic Take-up→ Cut to length(optional)
The complete line ensures:
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Precise temperature control
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Uniform microstructure
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Stable elongation & relaxation rate
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Excellent surface quality
🔹 Technical Advantages
✔ High-speed multi-block drawing system
✔ Hardened & ground gear reducer for stable transmission
✔ Accurate tension control system
✔ Energy-saving heating system
✔ Automatic coiling and compacting unit
✔ PLC centralized control with user-friendly HMI
🔹 Key Features
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Low relaxation rate ≤ 2.5% (1000h)
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High tensile strength and consistency
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Smooth operation with low vibration and noise
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High production efficiency
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Designed for continuous 24-hour industrial operation
🔹 Optional Configurations
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Online diameter measurement
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Eddy current flaw detection
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Automatic weighing and strapping system
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Customized layout according to workshop condition