15.24mm 2230 Mpa PC Strand

Introduction and application scope of 15.20mm 2230MPa low relaxation Prestressed Steel strand

I. Core parameters and characteristics of the product

Basic specifications: nominal diameter 15.20mm, twisted by 7 high-strength steel wires (1 center wire + 6 peripheral wires), cross-sectional area of ​​about 140mm², standard tensile strength of 2230MPa, far exceeding the conventional 1860MPa steel strand, belonging to the ultra-high strength level.

Low relaxation performance: Under 70% nominal stress, the relaxation rate of 1000 hours is ≤1.5%, and the stress loss is only 1/5 of that of ordinary steel strand, which greatly reduces the subsequent maintenance cost.

Mechanical properties: elastic modulus 195-200GPa, elongation ≥3.5%, both high strength and toughness, in line with the high standard requirements of GB/T 5224-2014.

2. Typical application scenarios

Application fields Specific scenario examples Advantages

Bridge engineering Cables of large-span cable-stayed bridges, main cables of suspension bridges, and prestressed systems of continuous beam bridges (such as cross-river bridges and high-speed railway bridges) High-strength load-bearing reduces the amount of steel cables, and low relaxation characteristics avoid stress decay under long-term loads, ensuring structural safety.

High-rise buildings and foundations Super-high-rise floor slabs, prestressed beams of giant frame structures, anchor cables for deep foundation pit support, and tensioning of foundation rafts Reduce the amount of concrete and the deadweight of the structure, improve seismic performance, and simplify the anchoring design of complex foundations.

Energy and special engineering Annular prestressing of nuclear power plant containment, tensioning of offshore wind power monopile foundations, and circumferential reinforcement of LNG storage tanks Corrosion resistance (can be matched with epoxy coating) and high reliability meet the needs of harsh environments, and have excellent long-term stress stability.

Water conservancy and transportation Anchoring of dam anti-seepage walls, prestressed tendons for tunnel linings, and slope support of highways Adapt to the humid environment of water conservancy projects and reduce the risk of landslides through high bearing capacity in slope support.

III. Application advantages and value

Load capacity upgrade: The bearing capacity of a single strand is about 312kN (140mm²×2230MPa), which is 20% higher than that of 1860MPa steel strand, and is suitable for large span and heavy load scenarios.

Construction efficiency improvement: The low relaxation characteristics reduce the number of tensioning and the need for re-tensioning, and the anchor system is more compact, shortening the construction period by about 30%.

Full-cycle economy: Although the unit price is 15%-20% higher, the stress loss in 10 years is ≤3% (about 10%-15% for ordinary steel strands), and the long-term maintenance cost is reduced by more than 30%.

IV. Application precautions

Anchor matching: High-strength clip-type anchors (such as XM15-7) must be selected, and the anchor efficiency coefficient is ≥0.95 to ensure that the gripping force matches the strength of the steel strand.

Environmental adaptation: Galvanized or epoxy coatings are required in corrosive environments, and coastal projects need to additionally verify the risk of chloride ion erosion.

Tension control: The tension stress should be 65%-75% of the standard strength (1450-1670MPa), and the "stress-elongation" dual control should be adopted, with a deviation of ≤±6%.

V. Industry application trend

As infrastructure expands to "large span, deep underground, and marine engineering", 2230MPa low relaxation steel strands are gradually replacing traditional steel strands with their "high strength, low loss, and long life" characteristics. For example, in projects such as the cross-sea tunnel in the Guangdong-Hong Kong-Macao Greater Bay Area and the super-high-rise buildings in Xiongan New Area, its application proportion has increased to 40%, becoming an important support for green building materials and intelligent construction.15.24mm 2230 Mpa PC Strand

Chunpeng Group is a leading and professional manufacturer of prestressed concrete (PC) steel materials, with over 30 years of industry experience.

We are committed to delivering high-quality products and innovative solutions for infrastructure and construction projects worldwide.

Our Core Products are pc steel strand (Ultra High Tensile Strength PC Strand, Normal Tensile Strength PC Strand), Unbonded PC Strand, Galvanized PC Steel Strand, Weather-Resistant & Anti-Corrosion PC Strand, and PC Steel Wire. 

In addition to our PC strand products, we also supply Prestressed Anchorage Systems and Photovoltaic Mounting Systems.