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Prestressed Concrete Steel Strands are high-strength steel materials designed to enhance the performance of concrete structures. They are composed of multiple cold-drawn smooth or indented steel wires twisted together. These strands are primarily used in prestressed concrete structures across various industries, including bridge construction, large-scale buildings, water conservancy projects, and mining operations, to increase load-bearing capacity and durability.
High Strength: Offers excellent tensile and compressive strength, significantly boosting the load-bearing capacity of structures.
Good Ductility: Exhibits substantial elongation before breaking, enhancing the toughness of structures.
Corrosion Resistance: The surface can be specially treated, such as galvanization, to improve durability in harsh environments.
Low Relaxation: Special processing ensures low relaxation, maintaining long-term stability.
Prestressed concrete steel strands are categorized based on their structure and specific applications. Each type is assigned a unique designation:
1×2 Standard Type: Made of two cold-drawn smooth steel wires, suitable for general prestressed applications.
1×3 Standard Type: Comprised of three cold-drawn smooth steel wires, offering enhanced strength.
1×7I Indented Type: Features six indented steel wires twisted around a central wire, optimizing the bond with concrete.
1×7H Spiral Rib Type: Similar to 1×7I but with a spiral rib central wire, further improving bonding performance.
(1×7)C Compact Drawn Type: After twisting seven steel wires, they undergo cold drawing to increase density and strength.
1×19S Seale and 1×19W Warrington Types: Special multi-layer twisted structures designed for high-strength requirements in long-span structures.
Prestressed concrete steel strands are widely used in large-scale infrastructure and construction projects, including:
– Suspension cables, stay cables, and prestressed beams in bridges.
– Transfer floors and slabs in high-rise buildings.
– Reinforcement of containment structures in nuclear power plants.
– Support systems in tunnels and underground engineering.
The diameter of prestressed steel strands typically ranges from 12.7mm to 15.7mm, with lengths customized according to project requirements, ensuring compatibility with various construction conditions and design specifications.
| Product Name | Standards | Specifications | Strength Level | Zinc Coating Level | Performance Characteristics |
| Galvanized Steel Strand | YB/T5004 GB/T1179 GB/T3428 Supply Technical Agreement ASTM A475 BS183 |
1×7/4.5-12.0 1×19/7.5- 17.5 |
1270-1670 G1A-G5A or as per Agreement |
A/B or as per Technical Agreement | The surface of the wire is smooth with a uniform zinc coating; twisting (stranding) is even; electrical resistivity, mechanical, and physical properties fully meet the customer’s specified requirements; the wire has good drawability. |
| Product Name | Standards | Nominal Diameter | Diameter Deviation | Nominal Tensile Strength | Performance Characteristics |
| Cold-Drawn Steel Wire, Plain Round Steel Wire, Spiral Ribbed Steel Wire, Indented Steel Wire |
GB/T5223, BS5896, pr EN10138, AS/NZS 4672, JIS G3536 and so on |
φ4.0、φ4.8 Φ5.0、Φ6.0 φ6.25、φ7.0 φ7.0、φ8.0 φ9.0 |
±0.04
±0.05 ±0.06 |
1470MPa 1570MPa 1670MPa 1770MPa 1860MPa |
High Strength, Low Relaxation |
| Product Name | Standards | Nominal Diameter | Diameter Deviation | Nominal Tensile Strength | Performance Characteristics |
| Prestressed Concrete Steel Strand | GB/T 5224 ASTM A416/A416M BS5896 PrEN10138 AS/NZS 4672 JIS G3536 |
1×7-9.3 | +0.30/-0.15 | 1720MPa
1770MPa 1860MPa 1960MPa 2000MPa |
High Strength, Low Relaxation |
| 1×7-9.50 (9.53) |
+0.30/-0.15 | ||||
| 1×7-12.5 | +0.40/-0.15 | ||||
| 1×7-12.7 | +0.40/-0.15 | ||||
| 1×7-12.9 | +0.40/-0.15 | ||||
| 1×7-15.2 (15.24) |
+0.40/-0.15 | ||||
| 1×7-15.7 | +0.40/-0.15 | ||||
| 1×7-17.8 | +0.40/-0.15 | ||||
| 1×7-21.6 | +0.40/-0.15 | ||||
| Product Name | Standards | Nominal Diameter | Nominal Tensile Strength | Performance Characteristics | |
| Unbonded Prestressed Steel Strand | JG/T161 | 1×7-12.7 | 1860MPa | Unbonded prestressed steel strand is coated with a corrosion-resistant lubricating layer on its surface and encased in a high-density polyethylene sheath, allowing for permanent relative movement between the steel strand and the sheath.
Its advantages include: no need to reserve conduits during construction, eliminating complex procedures like threading and grouting, simplifying the construction process, and accelerating construction speed. Additionally, it has low friction and can easily be bent into multi-span curved shapes, making it particularly suitable for large-span single and double-direction continuous multi-span curved reinforcement beams and roof structures. |
|
| 1×7-15.2 | 1960MPa | ||||
