15.20mm 2230MPa Low Relaxation Prestressed Steel Strand – High-Strength, Long-Life Solution for Modern Infrastructure
Engineered for demanding structural applications, this 15.20mm diameter prestressed steel strand delivers exceptional tensile strength of 2230MPa—significantly surpassing the conventional 1860MPa standard—making it ideal for high-load, long-span, and durable construction projects worldwide. Designed with low relaxation properties (≤1.5% after 1000 hours at 70% stress), it ensures minimal stress loss over time, reducing maintenance needs and enhancing structural integrity across decades. Manufactured by Chunpeng Group, a global leader in prestressed concrete materials with over three decades of expertise, this product combines advanced metallurgy, precision manufacturing, and rigorous quality control to meet international engineering benchmarks such as GB/T 5224-2014.
Key Features: High tensile strength (2230MPa), ultra-low relaxation performance (<1.5% over 1000 hrs), elastic modulus of 195–200 GPa, elongation ≥3.5%, and cross-sectional area of ~140 mm². These attributes make it an optimal choice for pre-tensioned and post-tensioned systems where reliability, efficiency, and longevity are critical. The strand is available in galvanized or epoxy-coated variants for enhanced corrosion resistance in aggressive environments like marine, coastal, or industrial zones.
This engineered solution offers substantial advantages beyond raw strength: each strand can carry up to 312 kN—about 20% more than traditional strands—allowing for reduced material usage and lighter structures. Its low relaxation behavior minimizes re-tensioning requirements during installation, shortening project timelines by approximately 30%. While the initial cost may be 15–20% higher, lifecycle savings exceed 30% due to lower stress decay over 10 years compared to standard alternatives. This makes it not only a technical upgrade but also a financially sound investment in sustainable infrastructure development.
Application Scenarios: Ideal for large-scale bridge engineering—including cable-stayed and suspension bridges, continuous beam systems, and offshore wind turbine foundations—the strand supports heavy-duty load transfer while maintaining long-term stability. In skyscraper construction, it enables efficient floor slab design, reduces foundation weight, and improves seismic resilience. For energy projects like nuclear containment structures, LNG storage tanks, and dam reinforcement, its consistent stress retention under extreme conditions ensures safety compliance. Additionally, it excels in tunnel linings, slope stabilization, and deep excavation support within water conservancy and transportation networks.
User Feedback Highlights: Engineers and contractors report improved construction speed, fewer anchor-related issues, and confidence in long-term performance. One civil engineer noted, “The reduced need for tension adjustments saved us weeks on a highway bridge project.” Another project manager added, “We’ve seen no measurable stress loss after five years in a coastal environment—something we couldn’t achieve with older-grade strands.”
Frequently Asked Questions: What distinguishes this strand from regular PC steel? It features higher tensile strength (2230MPa vs. 1860MPa), superior relaxation characteristics (≤1.5% vs. typically 5–10%), and better fatigue resistance, making it suitable for dynamic and static loads alike. How should it be anchored? Use high-efficiency clip-type anchors (e.g., XM15-7) with an anchor efficiency coefficient ≥0.95 to fully utilize the strand’s capacity. Is it suitable for corrosive settings? Yes—if coated with zinc or epoxy, especially in marine, chemical, or humid climates. Always verify chloride ion exposure levels for coastal installations. What tension range should be applied? Typically 65–75% of the nominal strength (1450–1670 MPa), using dual control based on both stress and elongation measurements, with deviations kept within ±6% for accuracy.
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