A method for improving the torsional performance of galvanized steel wire used in bridge cables
A technology of galvanized steel wire and torsion performance, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of low torsion turns of high-strength galvanized steel wire, and achieve small process changes and low energy consumption Low, low-heating-required effect
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Embodiment 1
[0027] Production of Galvanized Steel Wires for Ф7mm 1960MPa Bridge Cables
[0028] 1) Composition of domestic high-carbon steel wire rod with a diameter of 14mm (C 0.93%, Si0.88%, Mn 0.20%, balance Fe), sorbite rate of 90%, and wire rod strength of 1320MPa.
[0029] 2) After the wire rod is pickled to remove the scale on the surface, then the surface is phosphating.
[0030] 3) Carry out 9 times of continuous drawing to produce a steel wire with a diameter of Ф7mm, a strength of 2040MPa, and a number of torsion turns of 22.
[0031] 4) The steel wire is tempered at a low temperature by hot air at a temperature of 260° C., and the heat treatment time is 48 hours.
[0032] 5) Hot-dip galvanizing is performed on the steel wire; the galvanizing temperature is 450°C, and the galvanizing time is 40s.
[0033] 6) Stabilization treatment, using intermediate frequency heating, the temperature is selected as 380°C, and the time is 25s.
[0034] 7) The strength of the produced galvan...
Embodiment 2
[0036] Production of galvanized steel wire for Ф5mm 1860MPa bridge cables:
[0037] 1) Composition of domestic high-carbon steel wire rod with a diameter of 13mm (C 0.84%, Si 0.39%, Mn 0.60%, the balance is Fe), the sorbite rate is 90%, and the wire rod strength is 1260MPa.
[0038] 2) After the wire rod is pickled to remove the scale on the surface, then the surface is phosphating.
[0039] 3) Carry out 9 times of continuous drawing to produce a steel wire with a diameter of Ф5mm, a strength of 1940MPa, and a number of torsion turns of 24.
[0040] 4) The steel wire is tempered at a low temperature by hot air at a temperature of 200° C. and the heat treatment time is 36 hours.
[0041] 5) Hot-dip galvanizing is performed on the steel wire; the galvanizing temperature is 440°C, and the galvanizing time is 30s.
[0042] 6) Stabilization treatment, using intermediate frequency heating, the temperature is selected as 380°C, and the time is 20s.
[0043] 7) The strength of the ...
Embodiment 3
[0045] Production of galvanized steel wire for Ф5mm 1770MPa bridge cables:
[0046] 1) Composition of domestic high-carbon steel wire rod with a diameter of 12.5mm (0.82% C, 0.30% Si, 0.60% Mn, 0.19% Cr, the balance being Fe), the sorbite rate is 90%, and the wire rod strength is 1220MPa.
[0047] 2) After the wire rod is pickled to remove the scale on the surface, then the surface is phosphating.
[0048] 3) Carry out 9 passes of continuous drawing to produce a steel wire with a diameter of Ф5 mm, a strength of 1850 MPa, and a number of torsion turns of 25.
[0049] 4) The steel wire is tempered at a low temperature by hot air at a temperature of 200° C., and the heat treatment time is 24 hours.
[0050] 5) Hot-dip galvanizing is performed on the steel wire; the galvanizing temperature is 460°C, and the galvanizing time is 20s.
[0051] 6) Stabilization treatment, using intermediate frequency heating, the temperature is selected as 380°C, and the time is 30s.
[0052] 7) T...
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