Contact Info
- Tel: +86-311-87813582
- Fax: +86-311-87829648
- Email: Kaiwork@126.com
- Whatsapp: +86 86 138 3318 2035
- Add: No.345, Youyi North Street, Shijiazhuang City, Hebei Province, China.
​Global ISO Standard Infrastructure Grade. Manufactured strictly in accordance with ISO 6934-4, our 7-wire bonded prestressed concrete steel strand delivers heavy-duty ultimate breaking load performance, strict metallurgical tolerances, and certified compliance for international civil engineering and structural projects.
ISO 6934-4 Prestressing Steel Strand (Bonded Type) | 7-Wire Low-Relaxation Steel Strand
​Designed for critical load paths and high-stress structural spans under global ISO design frameworks. Every coil adheres to rigorous mechanical benchmarks.
|
Technical Parameter |
Specification Value |
Governing Standard |
|
Standard Specification |
ISO 6934-4 (Prestressing Steel - Part 4: Strand) |
ISO 6934-4 |
|
Strand Configuration |
7-Wire (1 Center Wire + 6 Helical Outer Wires) |
ISO 6934-4 / ASTM A416 |
|
Available Nominal Diameters |
9.53mm, 11.11mm, 12.7mm, 15.24mm, 17.8mm |
ISO 6934-4 |
|
Specified Tensile Strength |
High Tensile Grade (1770 MPa / 1860 MPa) |
ISO 6934-4 |
|
Relaxation Class |
Class 2 (Low Relaxation, Max 2.5% at 1000h) |
ISO 6934-4 |
|
Surface Condition |
Uncoated, Bright, Stress-Relieved, Bonded |
Clean, Corrosion-Inhibited Free |
· ​ISO 6934-4 Global Compliance: Manufactured strictly to meet the stringent mechanical, geometric, and relaxation requirements of the international ISO standard for prestressed concrete tendons.
· ​Superior Tensile & Load Performance: Premium high-carbon steel wire rods deliver exceptional ultimate breaking loads, ensuring high structural safety factors for demanding engineering designs.
· ​Low-Relaxation Stability (Class 2): Advanced thermal-mechanical stabilization restricts stress relaxation to a maximum of 2.5% at 1000 hours, securing permanent prestressing force retention over extended lifecycles.
· ​Enhanced Bonding Interlock: The precise 7-wire helical geometry creates an optimal mechanical bond with structural cement grout, eliminating slip in post-tensioned applications.
​Engineered for heavy-load-bearing structures across global markets utilizing international ISO design standards:
· ​Major Transportation Projects: Long-span highway and railway bridges, box girders, precast segmental bridges, and elevated viaducts.
· ​Commercial & High-Rise Buildings: Post-tensioned slab systems, parking structures, and large-span industrial roofs.
· ​Geotechnical & Marine Engineering: High-capacity ground anchors, rock slopes, dam stabilization, and deepwater port wharfs.
​Q: Do these strands fully comply with ISO 6934-4 specifications?
A: Yes. Our bonded steel strands are produced in strict compliance with ISO 6934-4, ensuring complete acceptance by international consulting engineers and main contractors worldwide.
​Q: What is the standard export packaging and container load?
A: Coils are wrapped in moisture-proof plastic film and heavy-duty anti-rust woven cloth, secured with high-tensile steel strapping, and palletized. A standard 20ft container loads approximately 20 to 27 metric tons.
​Q: Can we request third-party quality inspection prior to shipment?
A: Yes. We fully support independent pre-shipment inspections and audits conducted by recognized global agencies such as SGS, BV, Intertek, or TUV.
