Product Overview
This is a 1×7 strand: six outer wires twisted around a core wire one size larger, then stabilised by tensioning and medium frequency tempering. That treatment is what gives low relaxation and stops the strand untwisting when it is cut. At the common 1860 MPa class the minimum breaking load is about 260 kN with 1000 hour relaxation at or below 2.5% and a modulus around 195 GPa – the working element of a post-tensioning system.
Specifications
| Parameter | Value |
|---|---|
| Construction | 1×7-12.7 / 15.2 / 15.7 mm |
| Nominal area | 98.7 – 150 mm2 |
| Tensile strength | 1860 MPa (1770 / 1960 MPa on request) |
| Minimum breaking load | 260 kN (15.2 mm) |
| Load at 0.2% offset | min 221 kN |
| Relaxation at 1000 h | max 2.5% (low relaxation) |
| Elongation (L0 min 600 mm) | min 3.5% |
| Modulus of elasticity | 195 +/- 10 GPa |
| Coating | Bare / galvanized / epoxy coated / sheathed |
| Standard | ASTM A416 / GB/T 5224 / EN 10138 |
Applications
Used for post-tensioning tendons in highway and railway bridges, track slabs and sleepers, circumferential prestressing of nuclear containment and LNG tank walls, rock anchors for slopes and excavation, and pretensioning beds in precast yards. Bridge projects in the Middle East and Southeast Asia mostly buy the 15.2 mm low relaxation grade.
Packing / Delivery / Payment
Coiled and wrapped with steel strapping over plastic film, each reel 1.5-3.5 km weighing about 2-3 tons, with rust preventive paper inside. A 20GP holds about 20 tons. Stock ships in 10-20 days and production orders in 30-40 days. Payment by L/C at sight or T/T with 30% deposit. We supply EN 10204 3.2 certificates, relaxation and fatigue test reports, SGS inspection, packing list and Certificate of Origin.