15.20mm Low Relaxation Prestressed Steel Strand – High-Performance Solution for Modern Infrastructure
Engineered for durability and precision, the 15.20mm low relaxation prestressed steel strand is a premium-grade material widely adopted in advanced construction projects worldwide. Comprising seven high-strength steel wires twisted into a single unit, this strand delivers exceptional tensile strength—reaching up to 1860 MPa—and maintains consistent prestress over time due to its ultra-low relaxation rate of just 1.0%–2.5% after 1000 hours. Designed to meet international standards such as GB/T 5224-2014 and ASTM A416/A416M-24, it ensures long-term structural integrity in demanding environments.
Key characteristics include superior corrosion resistance, excellent fatigue performance, and minimal creep under sustained loads—making it ideal for applications where safety, longevity, and load-bearing capacity are critical. The strand’s uniform diameter of 15.20mm allows for precise installation in both precast and cast-in-place concrete systems, while its compatibility with various anchorage systems enhances flexibility across different project designs.
This engineered steel solution is more than just a building component—it's a cornerstone of modern civil engineering. Its ability to resist deformation, reduce cracking, and improve overall stiffness directly contributes to enhanced structural resilience in bridges, skyscrapers, and deep excavation supports. By maintaining consistent tension throughout the lifecycle of a structure, it minimizes maintenance needs and extends service life, offering significant cost savings over time.
Applications span a wide range of sectors including highway and railway bridge construction, high-rise residential and commercial buildings, industrial facilities with large-span roofs, and foundation pit stabilization in urban developments. In cantilevered box-girder bridges, for example, it provides essential prestressing forces that counteract self-weight and dynamic traffic loads, ensuring stability and minimizing deflection. Similarly, in multi-story structures, it helps control floor slab behavior under live and dead loads, improving occupant comfort and safety.
Users consistently report improved construction efficiency, reduced need for post-tensioning adjustments, and fewer field failures compared to conventional reinforcement methods. Many engineers highlight how the strand’s predictable stress retention simplifies design calculations and bolsters confidence during inspections and certifications. Contractors appreciate its ease of handling and compatibility with automated tensioning equipment, which accelerates installation timelines without compromising quality.
Common questions often revolve around environmental suitability—such as performance in coastal or humid climates—and whether the strand requires special coating or protection. While standard versions offer good weather resistance, options like galvanized or anti-corrosion-treated variants are available for aggressive exposure conditions. Installation best practices emphasize proper alignment, controlled tensioning procedures, and adherence to manufacturer guidelines to maximize effectiveness and compliance with global codes.
As a trusted provider of prestressed concrete materials for over three decades, Chunpeng Group continues to lead innovation in PC steel solutions, delivering not only reliable products but also technical support tailored to regional requirements and sustainability goals. Whether used in infrastructure development or specialized architectural projects, this 15.20mm Low Relaxation steel strand remains a benchmark for excellence in structural engineering worldwide.
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