17.8mm 2230MPa Low Relaxation Prestressed Steel Strand – High-Strength, Durable, and Engineered for Modern Infrastructure
This high-performance prestressed steel strand, with a diameter of 17.8 millimeters and a tensile strength of 2230 megapascals, represents the pinnacle of modern construction materials designed for large-scale civil engineering projects worldwide. Unlike conventional reinforcement bars, this ultra-high-strength steel strand is specifically engineered to reduce stress loss over time while enhancing structural integrity under extreme loads. Its low relaxation property—measured at ≤2.5% after 1000 hours at 70% of nominal strength—ensures long-term stability in critical applications where minimal deformation and consistent load transfer are essential.
Manufactured from premium-grade high-carbon steel (such as 82B), alloyed with manganese and silicon for superior toughness, this 7-wire configuration (1 central wire + 6 outer wires) offers excellent fatigue resistance, elongation capacity (≥3.5%), and exceptional durability even under dynamic loading conditions. The production process includes cold drawing, precise twisting, controlled heat treatment to eliminate internal stresses, and optional surface coatings like galvanizing or epoxy resin to enhance corrosion protection—ideal for coastal, marine, or aggressive environmental settings.
Key features include: - Tensile strength exceeding 2230 MPa — significantly higher than standard reinforcing steel (e.g., HRB400 at ~400 MPa). - Yield strength ≥2000 MPa at 0.2% offset, enabling efficient use in tension-critical elements. - Stress relaxation rate ≤2.5% over 1000 hours, ensuring sustained prestress performance. - Fatigue endurance of up to 2 million cycles at 195 MPa stress amplitude, suitable for bridges, wind turbines, and seismic zones. - Compatible with specialized anchorage systems such as M17.8 clip anchors and hydraulic jacks rated at 400 kN or more.
Engineers and contractors globally rely on this product for demanding infrastructure needs. It is widely used in large-span structures like stadium roofs, airport terminals, and industrial halls where spans exceed 30 meters. In skyscrapers, it supports unbonded slabs in transfer levels, reducing dead load while improving crack control. For bridge construction, whether cable-stayed, suspension, or precast beam systems, this strand delivers reliable anchoring force—up to 500–1000 kN per anchor—making it ideal for spans between 50 and 150 meters. Additionally, it serves vital roles in geotechnical applications such as deep foundation pit support, tunnel lining, and dam reinforcement, particularly where water pressure, temperature fluctuations, or ground movement pose challenges.
Specialized environments benefit equally—from nuclear containment structures requiring fail-safe prestressing to offshore platforms needing anti-corrosion solutions. The strand’s compatibility with weather-resistant coatings ensures extended service life in saltwater exposure or harsh climates. Whether for renewable energy installations like photovoltaic mounting systems or underground mining supports, its combination of strength, longevity, and adaptability makes it indispensable for engineers seeking durable, future-proof solutions.
Users consistently report enhanced structural safety, reduced maintenance costs, and improved project timelines due to efficient installation using reel-based handling and compatible tensioning equipment. Proper specification of anchorage hardware and adherence to recommended stressing levels (typically 60–75% of the yield strength) prevent over-tensioning risks and ensure optimal performance throughout the asset’s lifecycle.
Frequently asked questions often center around material selection for specific environments—such as choosing galvanized or epoxy-coated variants for outdoor or corrosive areas—and how to properly integrate the strand into complex prestressed concrete designs. Another common concern involves compliance with international standards like ASTM A416, EN 10138, or ISO 10181, which this product meets through rigorous quality control during manufacturing. With decades of experience and continuous innovation, Chunpeng Group remains a trusted supplier of advanced prestressed steel solutions that meet global engineering demands across sectors including transportation, energy, and public infrastructure.
Contact Now
