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ProductsDiscover Ruibaolong's full range of High-Performance PC Steel Wire, PC Steel Bar, and Cold Drawn Wire. We specialize in SWRH82B Spiral Ribbed, Plain, and Indented surfaces, as well as Hose Reinforcement Wire. ISO 9001 certified manufacturer for PCCP and infrastructure projects.
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About UsTianjin Ruibaolong Prestressed Steel Strand Co., Ltd. is a leading ISO 9001 certified manufacturer established in 2010. We specialize in producing and exporting high-quality PC wire and steel bars globally.
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BlogAbout Ruibaolong We are a professional metal products manufacturer dedicated to High-Performance PC Steel Wire. With a strong market network covering China and an expanding global footprint, we supply essential materials for bridges, buildings, and infrastructure. Here, we share our journey in connecting the world with strength and durability.
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Contact UsGet in touch with Ruibaolong for factory-direct quotes on PC Wire and Steel Bars. Located in Tianjin, China. Contact our export team today for technical support and pricing.
Prestress Steel Wire (3–12mm, 1570–1860 MPa) – Complete Technical Guide (2026)
Introduction: Why Prestress Steel Wire Quality Defines Structural Safety Prestress steel wire is the core load-bearing reinforcement in modern concrete structures. From concrete poles and bridge girders to PCCP pipelines and precast slabs, the long-term safety of a structure depends on one critical factor: the consistency and reliability of the prestressing wire embedded inside the concrete. As a professional prestress steel wire manufacturer, Ruibaolong supplies high-performance PC wire from 3mm to 12mm, engineered for: High tensile strength Low relaxation performance Stable and predictable bonding behavior
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Prestress Steel Wire (3–12mm, 1570–1860 MPa) – Complete Technical Guide (2026)
Product Details
Table of Contents
- 1. What Is Prestress Steel Wire?
- 2. Available Sizes and Strength Grades (3–12mm)
- 3. Why SWRH82B Is the Preferred Raw Material
- 4. Surface Types: Plain vs Spiral Ribbed
- 5. Understanding Low Relaxation Performance
- 6. Packaging and Break Bulk Shipping Protection
- 7. Common Applications of Prestress Steel Wire
- 8. How to Evaluate Prestress Steel Wire Quality
What Is Prestress Steel Wire?
Prestress steel wire is a high-strength carbon steel wire used to introduce compressive stress into concrete before or after loading.
This prestressing force counteracts tensile stress in concrete, significantly improving:
- Load-bearing capacity
- Crack resistance
- Fatigue performance
- Long-term durability
Prestress steel wire is widely used in both:
- Pre-tensioned systems
- Post-tensioned systems
Available Sizes and Strength Grades (3–12mm)
Ruibaolong manufactures prestress steel wire across a full diameter range to meet global engineering standards.
Standard Diameter Range & Applications
| Diameter (mm) | Typical Applications |
|---|---|
| 3.0 – 4.0 | Small precast elements, light reinforcement |
| 5.0 – 6.0 | Precast slabs, beams, sleepers |
| 7.0 | Concrete poles, PCCP, bridge girders |
| 8.0 – 10.0 | Large-span beams, foundations |
| 11.0 – 12.0 | Heavy-duty infrastructure applications |
7.0mm prestress steel wire is the most widely used size globally and serves as the benchmark for quality evaluation.
Why SWRH82B Is the Preferred Raw Material
The Metallurgical Advantage
SWRH82B is a high-carbon steel wire rod (≈ 0.82% carbon) specifically designed for prestressing applications.
After controlled patenting heat treatment, SWRH82B forms a fine pearlitic microstructure, delivering an optimal balance of:
- High tensile strength
- Excellent ductility
- Stable low-relaxation behavior
Lower-grade materials (such as 72B or 77B) often reach high strength only through excessive cold drawing, which can result in:
- Increased brittleness
- Reduced fatigue life
- Higher relaxation losses
Typical Performance of SWRH82B Prestress Steel Wire
| Property | Typical Value |
|---|---|
| Tensile Strength | 1570 / 1670 / 1860 MPa |
| Breaking Force (7.0mm) | ≥ 65 kN |
| Relaxation (1000h) | ≤ 2.5% |
| Microstructure | ≥ 85% Sorbite |
| P / S Content | ≤ 0.025% |
Surface Types: Plain vs Spiral Ribbed Prestress Steel Wire
Prestress steel wire is available in different surface profiles depending on bonding requirements.
Plain Prestress Steel Wire
- Relies mainly on friction bonding
- Suitable for standard pre-tensioned elements
- Widely used in concrete poles and railway sleepers
Spiral Ribbed Prestress Steel Wire
- Features continuous helical ribs
- Creates mechanical interlock with concrete
- Provides shorter transfer length and stronger anchorage
Spiral ribbed PC wire is preferred for:
- Thin-walled precast elements
- Large-span slabs and beams
- Support-free or rapid-installation designs
Understanding Low Relaxation Performance
Low relaxation is essential for long-term structural stability.
High-quality prestress steel wire must maintain tension over decades under constant load.
SWRH82B performs exceptionally well in low-relaxation treatment due to:
- High material purity
- Stable pearlite lamellae
- Uniform internal stress distribution
This ensures:
- Reduced prestress loss
- Lower cracking risk
- Minimal long-term deflection
Packaging and Break Bulk Shipping Protection
Prestress steel wire is often shipped via break bulk vessels for large-volume infrastructure projects.
Packaging quality directly affects corrosion resistance and handling safety.
Ruibaolong Export Packaging System
Inner layer: Plastic film or VCI anti-rust protection
Outer layer: Blue waterproof woven fabric
Lifting: High-strength white lifting belts for crane operations
Result: Coil integrity maintained during long-distance sea transport
This packaging system has been proven reliable in shipments to:
- Africa
- Middle East
- Southeast Asia
- South America
Common Applications of Prestress Steel Wire
- Concrete poles
- Prestressed Concrete Cylinder Pipes (PCCP)
- Bridge girders and deck slabs
- Railway sleepers
- Precast beams and floor panels
- Industrial anchoring and foundation systems
How to Evaluate Prestress Steel Wire Quality
- Professional buyers should always verify:
- Raw material grade (SWRH82B preferred)
- Complete Mill Test Certificate (MTC)
- Tensile, torsion, and bending performance
- Surface integrity (no cracks, laps, or defects)
- Coil-to-coil consistency
⚠️ A single weak section in one coil can create localized stress concentration and long-term structural risk.
Conclusion: Engineering Reliability Starts with the Right Wire
Prestress steel wire is not a commodity material — it is a structural safety component.
Choosing a manufacturer that controls:
- Raw material quality
- Metallurgical consistency
- Production discipline
is essential for long-term performance.
Ruibaolong delivers:
- 100% SWRH82B high-carbon steel
- Full size coverage from 3–12mm
- Stable low-relaxation performance
- Export-proven packaging systems
Contact Ruibaolong
Looking for a reliable prestress steel wire manufacturer for your next project?
Request Mill Test Certificates (MTC)
Request samples for torsion and bending tests
Discuss application-specific solutions
👉 Contact Ruibaolong’s technical team today.
Certificate
The company focuses on the research, development, production, and sales of prestressed steel wires and bars. Products are widely used in power poles, pipe piles, floor slabs, sleepers, and other infrastructure and construction fields. The sales network covers the whole country and continues to expand overseas export markets.
Related Products
The company focuses on the research, development, production, and sales of prestressed steel wires and bars. Products are widely used in power poles, pipe piles, floor slabs, sleepers, and other infrastructure and construction fields. The sales network covers the whole country and continues to expand overseas export markets.
Frequently Asked Questions
The company focuses on the research, development, production, and sales of prestressed steel wires and bars. Products are widely used in power poles, pipe piles, floor slabs, sleepers, and other infrastructure and construction fields. The sales network covers the whole country and continues to expand overseas export markets.
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Tianjin Ruibaolong Prestressed Steel Strand Co., Ltd. is one of the professional manufacturers specializing in the research, development, production, and operation of prestressed steel wires, cold-drawn steel wires, and steel wires for roll welding machines.
Address: No. 3, Tianyu Road, Tianyu Science and Technology Park, Jinghai District, Tianjin
Email: globaltrade@rblprestress.com
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