Low-relaxation
Prestressed Steel strand is a high-performance reinforcement material engineered for modern infrastructure projects demanding long-term durability, structural integrity, and load-bearing efficiency. Designed to minimize stress loss over time under constant strain, this specialized steel strand ensures consistent prestress retention—critical in applications where safety, longevity, and performance are paramount. Manufactured by Chunpeng Group, a global leader in prestressed concrete (PC) materials with more than three decades of expertise, the product combines advanced metallurgy, precise engineering, and rigorous quality control to deliver superior results across diverse construction environments. This premium-grade steel strand consists of multiple high-strength wires twisted into a compact structure—typically 1×7—where six outer wires encircle one central wire. After cold drawing and heat treatment such as lead bath quenching and tempering, the material achieves exceptional tensile strength, often reaching 1860 MPa or higher. What truly sets it apart is its low relaxation behavior: at 20°C and with an initial stress equal to 70% of the nominal tensile strength, the stress relaxation rate after 1000 hours remains below 2.5%, significantly outperforming conventional strands that typically exceed 8%. This makes it ideal for structures subjected to sustained loads over extended periods, including bridges, high-rise buildings, and geotechnical systems requiring reliable anchoring and minimal maintenance. Key features include excellent corrosion resistance through optional galvanizing, epoxy coating, or plastic encapsulation; enhanced flexibility for easy handling during installation; and compatibility with various anchorage systems designed for optimal force transmission. Unlike standard steel strands used in temporary or low-demand scenarios, low-relaxation variants provide superior stability under dynamic conditions, reducing the risk of cracking, deflection, or premature failure in critical components like beams, slabs, and anchor cables. The manufacturing process begins with high-purity carbon steel wire rods, followed by surface cleaning via pickling and phosphating to remove impurities. These wires are then precisely twisted and subjected to stress-relief heat treatments that eliminate residual stresses while increasing yield strength. Optional surface enhancements further boost environmental resilience—making them suitable for coastal zones, humid climates, or aggressive chemical exposures common in industrial and hydraulic projects. Applications span bridge engineering (especially cable-stayed and post-tensioned structures), building frameworks requiring reduced beam depths and improved crack resistance, slope stabilization using ground anchors, and dam construction where impermeability and compressive strength are essential. Whether reinforcing precast elements, supporting deep foundations, or enabling long-span architectural designs, this strand supports innovative construction methods while meeting international standards for safety and sustainability. Users consistently praise its reliability in complex projects, noting fewer adjustments needed during tensioning compared to traditional options and longer service life even in harsh conditions. Many engineers highlight how it reduces lifecycle costs by minimizing maintenance and extending the operational lifespan of infrastructure assets—a key consideration for public works and private developments alike. Common questions often revolve around storage best practices—such as keeping coils dry and elevated to prevent rust—and ensuring proper tensioning procedures aligned with design specifications. Anchors must be matched correctly to avoid slippage or uneven stress distribution. Additionally, users frequently inquire about compliance with ASTM A416, EN 10138-3, or ISO 10138 standards, all of which are met by Chunpeng’s certified production lines. In summary, low-relaxation prestressed steel strand stands as a cornerstone of resilient civil engineering, offering unmatched performance for permanent structures where precision, endurance, and value over time matter most. Its versatility, proven track record, and adaptability to global project demands make it the preferred choice for architects, contractors, and engineers worldwide seeking durable, efficient, and future-ready solutions.
Contact Now
