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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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Classic CasesBrowse our portfolio of successful infrastructure projects. From domestic water diversion systems to international railway construction, see how Ruibaolong steel wire powers global engineering.
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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.
NEWS CENTER
Blog
23
2026
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01
Ensuring Performance: Advanced Packaging for 7mm Twisted PC Wire
Sourcing 7mm twisted wire for 2026? Mechanical strength is only half the story. Explore Tianjin Ruibaolong’s professional dual-layer packaging designed to minimize corrosion risks during long-haul sea freight to Morocco and Israel.
When sourcing 7mm twisted wire (professionally known as Spiral Ribbed PC Wire) for 2026 infrastructure projects, buyers often focus on core mechanical indicators such as 1690 MPa tensile strength. While strength is essential, it is not the only factor that determines on-site performance.
For high‑carbon SWRH82B steel, the real risk lies in what happens after production — during long‑distance sea freight to humid or coastal markets such as Morocco, Israel, Southeast Asia, and the Middle East.
At Tianjin Ruibaolong, we engineer rust‑resistant export packaging that protects wire integrity throughout the logistics chain, ensuring materials arrive ready for immediate construction use.
1. Why Twisted (Spiral Ribbed) PC Wire Requires Extra Care
Spiral ribbed PC wire features a helical surface geometry designed to maximize mechanical bonding with concrete. This structure delivers superior anchorage in:
Concrete poles
Precast piles
Sleepers and infrastructure elements
However, the same ribbed surface also creates:
- Larger exposed surface area
- More moisture retention points
- Higher sensitivity to salt air and condensation
Even light surface oxidation during transit can reduce bond quality and negatively impact long‑term structural performance.
2. Ruibaolong Dual‑Layer Rust‑Resistant Packaging System
To counter maritime humidity and long storage cycles, we apply a goal‑oriented, two‑stage protection strategy specifically developed for twisted PC wire exports.
Inner Layer — Moisture & Corrosion Barrier
High‑density plastic wrap or VCI (Volatile Corrosion Inhibitor) film
Creates a sealed micro‑environment around the coil
Neutralizes moisture and salt‑air corrosion risks
Outer Layer — Mechanical Protection
Heavy‑duty polypropylene woven fabric
Resists abrasion, tearing, and puncture during port handling
Maintains package integrity during container loading/unloading
Design Objective: Rust‑free arrival after long‑haul ocean transport.
3. Packaging Performance Comparison
| Feature | Standard Export Packaging | Ruibaolong Dual‑Layer Solution |
|---|---|---|
| Moisture Protection | Single plastic layer | Dual‑layer (VCI/Plastic + Woven) |
| Corrosion Risk | Moderate | Minimized via sealed environment |
| Mechanical Resistance | Basic | Reinforced against abrasion |
| Long‑Distance Sea Freight | Acceptable | Optimized for >30–45 days |
| Job‑Site Readiness | Inspection required | Ready for immediate use |
4. Professional Delivery for Global Infrastructure Projects
As a direct manufacturer with full export rights, Ruibaolong supplies:
Complete Mill Test Certificates (MTC)
Consistent coil weight and standardized packaging
Stable production for bulk infrastructure contracts
Available twisted PC wire sizes include:
- 7.0 mm
- 8.0 mm
- 9.0 mm
and so on……
All products are manufactured from SWRH82B high‑carbon rod and comply with international prestressing standards.
5. Storage & Handling Recommendations (Post‑Arrival)
To maintain optimal wire performance, we advise international clients to follow these best practices:
Prompt Customs Clearance
Move cargo to a dry indoor warehouse immediately after discharge.
Off‑Ground Storage
Place coils on wooden pallets to avoid ground moisture contact.
FIFO Inventory Management
Use First‑In, First‑Out logic to preserve surface condition.
6. Frequently Asked Questions (FAQ)
Q1: Is light surface rust acceptable for twisted PC wire?
A1:Minor cosmetic discoloration may be tolerated in some standards, but for concrete poles and precast piles, surface oxidation can reduce bond strength. Rust‑preventive packaging significantly lowers this risk.
Q2: Why is VCI film recommended for sea freight?
A2:VCI releases corrosion‑inhibiting molecules that protect steel surfaces without oiling, making it ideal for long‑distance container transport.
Q3: How long can Ruibaolong packaging protect the wire?
A3:Under normal sealed container conditions, our dual‑layer system is designed to protect coils for 45–60 days of sea freight plus storage.
Q4: Can packaging be customized for specific destinations?
A4:Yes. Packaging thickness, VCI grade, and outer fabric strength can be adjusted based on climate, transit time, and destination port conditions.
Looking for a Reliable Supplier of Twisted PC Wire?
Contact Ruibaolong today for a quote or to discuss your specific requirements with our engineering team.
Ruibaolong — Engineering steel performance from mill to job site.
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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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