Prestressed Steel Strand - High Tensile & Low Relaxation
High carbon prestressed steel strand is twisted by 2, 3, 7 or 19 pieces of high tensile steel wires. After surface treatment, high carbon steel wire rods are cold drawn to steel wires, then according to the strand structure, twisting a certain number of steel wires into a strand, next is the stabilization process of eliminating stress. In order to extend the durability, the wires would have metallic or non-metallic coating like galvanization, and in order to increase the bond strength with concrete, the wires surface may have nicks. High carbon steel strands are mainly used for prestressed concrete structure.
Classification:
According the number of steel wires in a steel strand, it can be divided into two-wire strand, three-wire strand, seven-wire strand and nineteen-wire strand.
According to the surface morphology of the strand, it can be divided into smooth steel strand, nick steel strand, co***cted steel strand and galvanized steel strand and so on.
Three-wire high carbon steel strands with black surface and their cross-section in the blue background show their structure.
High carbon three-wire steel strand has stable structure and mainly used for bridges.
An end high carbon steel strand and its cross-sectional picture show it was twisted evenly by 7 pieces of high carbon steel wires.
High carbon steel strand for prestressed concrete have high tensile strength and low relaxation.
Specifications:
Material: 77B, 82B.
Diameter range: 1.2mm - 36mm.
Standards: GB/T 5224, ASTM A416, BS 5896, JIS G3536, AS/NZS 4672, NBR-7483.
Surface: galvanized, un-galvanized, coated PVC/PE/NYLOY, nicked, smooth.
Style: 1×2, 1×3, 1×7 and 1×19.
Packing: Baling strip strapped, inner plastic cover, outer paper-plastic packing cloth.
Mechanics properties of steel strand - GB/T 5224
Structure Nominal Diameter (mm) Tolerance (mm) Cross-sectional area (S/mm2) Theoretical weight per 1000m (Kg/1000m) Tensile strength no small than (***) Yield strength no small than |
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