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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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NEWS CENTER
Blog
05
2026
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02
How to Protect PC Wire During PCCP Manufacturing and Installation
Introduction: Quality Is a Shared Responsibility
Manufacturing high-quality PC wire is only the first step.
During PCCP (Prestressed Concrete Cylinder Pipe) manufacturing and installation, improper handling can compromise even premium SWRH82B prestressing wire, leading to stress corrosion cracking (SCC) or hydrogen embrittlement.
Based on long-term field feedback and factory testing, this guide outlines critical handling risks and proven best practices to ensure PC wire performance is preserved from delivery to final pipe installation.
1. The “Rust Barrier” Problem in PCCP Production
The Risk
If PC wire coils develop rust before mortar spraying, a hidden failure mechanism begins.
The Mechanism
- Rust creates a separation layer between steel and mortar
- Corrosion products expand over time
- Voids form at the steel–mortar interface
- Chloride and moisture become trapped
- Stress corrosion cracking accelerates under prestress load
This risk is especially critical in marine pipelines and aggressive soil environments.
Best Practices
- Store PC wire in a dry, covered warehouse
- Avoid exposure before mortar coating
- Light, non-pitting oxidation may be acceptable
- Reject coils with flaky or deep rust
2. Protecting the Phosphating Layer (Often Overlooked)
Why the Phosphating Layer Matters
The phosphating layer on Ruibaolong PC wire is not cosmetic.
It provides:
- Controlled lubrication during winding
- Surface protection against hydrogen ingress
- Improved adhesion between steel and mortar
Common On-Site Mistake
- Excessive shotcreting pressure
- Abrasive mortar spray that strips the phosphate film
Best Practices
- Calibrate mortar spraying pressure
- Ensure coating, not erosion
- Avoid direct high-energy impact on exposed wire
3. Mechanical Damage: Small Scratches, Big Consequences
The Risk
Scratches and gouges act as stress concentration points.
Under high prestressing force, even minor surface damage can initiate:
- Micro-crack propagation
- Fatigue failure
- Sudden wire fracture
Ruibaolong Factory Controls
- Rolling guides instead of sliding guides
- Soft lifting belts instead of chains
- Zero-drag coil handling
On-Site Handling Rules
- Never drag coils on concrete or steel floors
- Use nylon or fabric lifting belts
- Place rubber mats under stored coils
- Avoid stacking coils directly on sharp surfaces
⚠️ A scratch that looks harmless during installation may become a fracture under service load.
4. Common Handling Risks and Preventive Measures (Quick Reference)
| Risk Area | Typical Mistake | Resulting Problem | Recommended Practice |
|---|---|---|---|
| Storage | Outdoor exposure | Surface rust | Dry, covered warehouse |
| Mortar spraying | Excessive pressure | Phosphate layer loss | Calibrated shotcrete |
| Lifting | Steel chains | Surface scratches | Nylon lifting belts |
| Ground contact | Dragging coils | Micro-cracks | Rubber mat protection |
| Stacking | Uneven support | Deformation | Flat, padded supports |
Ruibaolong Insight: Beyond the Spec Sheet
At Ruibaolong, stress corrosion testing is routine, not occasional.
However, no laboratory test can compensate for poor on-site handling.
Pipeline safety is not defined solely by wire grade or tensile strength — it depends on preserving surface integrity throughout PCCP manufacturing and installation.
FAQ — PC Wire Handling in PCCP Projects
Q1: Is light surface rust acceptable before mortar coating?
A: Minor, uniform oxidation without pitting may be acceptable. Flaking or deep rust is not.
Q2: Why is the phosphating layer important for PCCP wire?
A: It protects against hydrogen ingress and supports stable bonding with mortar.
Q3: Can handling scratches really cause wire failure?
A: Yes. Scratches act as stress raisers and can initiate cracks under prestress load.
Q4: Does higher tensile strength compensate for poor handling?
A: No. Surface damage negates the benefits of high-strength material.
Q5: Should contractors request handling guidelines from suppliers?
A: Absolutely. Proper handling protocols are part of quality assurance.
Conclusion: Handling Is a Critical Safety Link
PCCP pipeline safety is a chain — and handling is one of its most critical links.
Protecting PC wire during storage, winding, and mortar application ensures that its engineered performance is fully realized in service.
Call to Action
Need on-site technical support or handling guidelines for PCCP projects?
👉 Contact Ruibaolong’s engineering team
We provide handling manuals, stress corrosion data, and application-specific consultation to help you build safer pipelines.
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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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