High-Strength 7-Wire Prestressed Steel Strand – Grade 1860 [270] for Structural Engineering Applications
Engineered for durability, precision, and superior performance in demanding construction environments, this high-tensile steel strand is a premium solution for modern infrastructure projects. Comprising seven individually twisted wires made from specially heat-treated carbon steel, it delivers exceptional strength-to-weight ratio and flexibility—ideal for precast concrete elements, bridge decks, and long-span structures. With a nominal diameter of 15.24 mm (0.600 in), this strand meets international standards for prestressed concrete applications, offering consistent mechanical properties across diverse climates and load conditions.
Key characteristics include a minimum breaking strength of 260.7 kN (58,600 lbf), a steel area of 140.0 mm² (0.217 in²), and a weight of approximately 1102 kg per 1000 meters (740 lb per 1000 ft). The strand’s design ensures minimal elongation at 1% extension—just 3.5%—and exhibits low relaxation over time: only 2.5% after 1000 hours under 70% of its ultimate tensile load. This makes it particularly suitable for long-term structural integrity where minimal creep or stress loss is critical. Additionally, the difference between the center wire and outer wires is precisely maintained at 0.1016 mm (0.004 in), ensuring uniform stress distribution during tensioning and anchoring.
Manufactured by Chunpeng Group—a globally recognized leader in prestressed concrete materials with more than three decades of expertise—the strand undergoes rigorous quality control processes to ensure consistency, corrosion resistance, and compliance with ASTM A416 and EN 10138 standards. While available in a bare form for indoor or controlled environments, options such as galvanized or weather-resistant coatings are also offered to enhance protection against moisture, salt exposure, and atmospheric degradation—making it ideal for coastal regions, industrial zones, or humid climates.
This product excels in applications requiring reliable, long-lasting reinforcement, including highway bridges, high-rise buildings, railway tracks, parking structures, and large-scale civil engineering works. Its compatibility with various anchorage systems allows seamless integration into both new builds and retrofitting projects. Whether used in post-tensioned slabs, beams, or cable-stayed designs, this steel strand provides engineers with confidence in structural safety, reduced maintenance costs, and extended service life.
Users report excellent handling during installation, consistent performance under dynamic loads, and predictable behavior throughout the design lifecycle. Many appreciate the balance between tensile strength and ductility, which enhances safety margins without compromising constructability. Engineers often cite this strand as a preferred choice for projects demanding high reliability, especially when working with ultra-high-performance concrete or composite materials.
Common questions frequently revolve around compatibility with different anchorage types, suitability for seismic zones, and whether surface treatment affects bond strength. The answer lies in proper specification selection: bare strands offer maximum bond in grouted ducts, while galvanized versions maintain integrity in aggressive environments without sacrificing tensile capacity. For those concerned about long-term performance, the low relaxation value confirms that the strand maintains up to 97.5% of its initial tension even after prolonged use—an advantage not commonly found in standard-grade alternatives.
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