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+86 022 2376 3704
Prestressed Material
High Strength Low Relaxation hot-dip Galvanized Steel Strand for Prestress.
The strands are galvanized, with strong fatigue resistance and excellent corrosion resistance.
The process of single steel wire passing through the zinc bath is called hot-dip galvanizing, and the galvanized steel strand is twisted by 7 hot-dip galvanized steel wires. The adhesion of zinc layer is checked according to the wrapping test of the galvanized steel wire before twisting or the central steel wire of the finished galvanized steel strand. After 6 turns of winding, the zinc layer of the spiral ring shall not peel off.
USE
-Where can our galvanized pc strand use?
Arch bridge cable system
Cable-stayed Bridge system
Suspension Bridge Cable system
Prestressed structure not directly contacting with concrete mortar
Buildings for lifting and fixing tension elements, for instance, construction of agricultural greenhouse; Photovoltaic Mounting Suspension System
-Some common attentions in using of our galvanized pc strand.
The deflection tensile coefficient of galvanized steel strand normally used (not for bridge cable system) shall not be greater than 28%.
The deflection tensile coefficient of galvanized steel strand for bridge cable system shall be no more than 20%.
The fatigue test of galvanized steel strand in general applications (not for bridge cable system) , steel strand shall not break after being subjected to 2 million times of load.
The galvanized steel strand shall have a continuous zinc layer surface, free of local dezincification, iron exposure and other defects.
SPECIFICATIONS
The specifications is conforming with standard YB/T 152-1999
Specification:12.7mm, 12.9mm, 15.2mm, 15.7mm as per GB/T5224
Tensile Strength: 1860Mpa
Galvanized coating thickness: 190- 400 g/m2
| Structure | Nominal diameter | Tolerance on Diameter | Nominal Area of Section | Weight of strand | Tensile Strength, Rm | Minimum Breaking load,Fm | 0,2% proof force, Fp0.2 | Elongation Lo=500mm, Agt | Curvative of strand | Lay Length | The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than |
| (mm) | (mm) | (mm2) | (kg/1000m) | (N/mm2) | KN | KN | (%) | mm | mm | ||
| 1X7 | 12. 50 | +0.30 -0.10 | 93 | 730 | 1860 | 173 | 154 | 3.5 | 25 | (12-16)D | 2.5 |
| 1X7 | 12. 90 | 100 | 785 | 1860 | 186 | 166 | |||||
| 1X7 | 15.2 | +0.40 -0.20 | 139 | 1091 | 1860 | 259 | 230 | ||||
| 1X7 | 15. 70 | 1 | 1178 | 1860 | 279 | 248 |
Other Specifications:
PC Strand is conforming with ASTM A 416 - Grade 270K - Low Relaxation.
Galvanization Complying to ASTM A 475, Class A.
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