7-Wire Steel Strand for Concrete Prestressing
This 7-wire steel strand consists of six outer wires helically wound around a central wire, with a total diameter not exceeding 16 mm, specifically engineered for prestressing concrete structures like bridges and buildings. It falls under HTS 7312.10.3012 as stranded wire of iron or steel, not electrically insulated, designed for prestressing concrete, and classified as 'other' within that subheading. The high tensile strength and precise construction ensure it can withstand the forces required to compress concrete.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If coated with zinc (galvanized)
Galvanized prestressing strand shifts to the coated stranded wire subheading due to the protective zinc layer altering material composition.
If assembled into complete prestressing elements or bars
Finished prestressing assemblies or bars for concrete are classified under structures and parts of structures rather than raw stranded wire.
If not specifically for prestressing concrete
Stranded wire of similar specs but intended for general mechanical uses like cables falls outside the prestressing subheading.
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Import Tips & Compliance
• Obtain mill test certificates verifying minimum tensile strength (typically 1860 MPa) and compliance with ASTM A416 standards; declare exact wire diameter and construction to avoid misclassification; watch for anti-dumping duties on certain steel strand origins like China
Related Products under HTS 7312.10.30.12
15.2 mm Low Relaxation Steel Strand
A 15.2 mm diameter prestressing steel strand with low relaxation properties, made from seven high-carbon steel wires, used to induce compressive stress in concrete beams and slabs. Classified under HTS 7312.10.3012 as 'other' stranded wire for prestressing concrete, not electrically insulated, fitting the chapter definition of wire under 16 mm cross-section. Its compact stranding provides exceptional bond with concrete grout.
12.7 mm Parallel Wire Prestressing Strand
Prestressing strand composed of parallel-laid high-strength steel wires, 12.7 mm total diameter, designed for post-tensioning applications in concrete floors and parking structures. It qualifies for HTS 7312.10.3012 as other stranded wire specifically for prestressing concrete, meeting the iron/steel wire criteria with no insulation. The parallel configuration allows for easy installation through ducts in concrete.
9.53 mm Compact Prestressing Steel Cable
Compact 9.53 mm prestressing steel cable of seven twisted wires, optimized for high bond strength in pretensioned concrete railroad ties and piles. Under HTS 7312.10.3012 as other stranded wire for concrete prestressing, with cross-section under 16 mm per chapter notes. Its compact design minimizes void space when grouted.
15.7 mm High Tensile Prestressing Strand
15.7 mm high tensile strength steel strand (1860 grade) for prestressing concrete girders in highway overpasses, formed from seven cold-drawn wires. Fits HTS 7312.10.3012 as other stranded wire for concrete prestressing, not insulated, with wire dimensions under chapter limit. Provides long-term durability under sustained loads.
12.5 mm Unbonded Single Strand for Post-Tensioning
Single 12.5 mm unbonded prestressing strand, greased and sheathed for frictionless movement in post-tensioned concrete slabs, composed of seven steel wires. Classified in HTS 7312.10.3012 as other stranded wire for concrete prestressing since sheathing is not electrical insulation. Allows stressing after concrete cures.