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Steel Strand

Steel Strand
Click:  Update:2016-12-12 21:39:35  【Print】  【Close

Low relaxation prestressed steel strand

High carbon steel wire rod is adopted, after surface treatment of cold drawn into wire, and then press the steel strand wire stranded structure will be a certain number of strands, after eliminating stress and stabilization, suitable for prestressed concrete or similar products, to meet the requirements of GB/T5224-2014 standard. To extend durability, steel wire can be metal or non-metallic coating or coating, such as galvanized, epoxy resin, etc.. In order to increase the bond between concrete and surface can be scored. The prestressed steel strand drawing dies in a twisted through a mold compression process, more compact structure, more suitable for anchorage grip surface. The main characteristics of prestressed steel strand is high strength and good relaxation performance, yield strength is higher, more upright when unfolded. Common tensile strength level of 1860 MPa, there are 1720, 1770, 1960, 2000, 2100 MPa and the like intensity class.


Steel strand structure

Nominal diameter of steel strand       Dn/mm

Nominal tensile strength  Rm/MPa

The maximum force of the whole steel strand

Fm/kN

Total maximum elongation

(Lo500mm)Agt/%

Stress relaxation performance

The initial load is equivalent to the percentage of the actual maximum force/%

1000hThe stress relaxation rate

r/%

1×7

15.2

15.24

1720

241

For all specifications




3.5

For all specifications

 

 

 

 

70

 

 

80

For all specifications

 

 

 

 

2.5

 

 

4.5

17.8

17.78

327

15.7

1770

266

21.6

504

15.2

15.24

1860

260

17.8

17.78

355

21.6

530

1×19S1+9+9

17.8

1770

368


21.8


554


21.8

1810

567


17.8

1860

387


21.8


583

Note: according to the number of wire in a strand of steel wire can be divided into 2 strand steel strand, 3 wire strand, wire strand and strand of the 19 steel strand.