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High-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for bridge cable

A zinc-aluminum alloy and bridge cable technology, applied in metal material coating process, coating, hot-dip coating process, etc., can solve the problems of reduced load-bearing efficiency, extended construction period, and increased component material consumption

Inactive Publication Date: 2018-07-03
JIANGSU FASTEN STEEL CABLE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first result is that the proportion of the material strength of the cable used to bear its own weight increases, the proportion used to bear the load is relatively reduced, and the bearing efficiency is reduced; the second is that under the current steel wire strength, a larger cross-sectional area of ​​the cable is required , which not only creates a contradiction with its own weight, but also increases the amount of materials used for each component, increases the difficulty of construction, prolongs the construction period, and increases the cost

Method used

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  • High-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for bridge cable
  • High-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for bridge cable
  • High-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for bridge cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The implementation process of the Zn95Al5 alloy coated steel wire of 5mm-1960MPa in the present embodiment is as follows:

[0044] (1) Wire rod selection

[0045] The diameter of the wire rod is 12mm, which belongs to the ultra-pure, hypereutectoid steel high-carbon steel wire rod after water bath toughening treatment, and its chemical composition is C 0.85-0.95%, Si 0.12-1.30%, Mn0.30 ~0.90%, P≤0.015%, S≤0.005%, Cr0.20~0.60%, Cu≤0.05%; metallographic structure: decarburized layer≤0.07%, grain size 7, sorbite≥85%, There is no martensite and reticular cementite; the mechanical properties meet: tensile strength ≥ 1290MPa, area reduction ≥ 30%, elongation ≥ 10%.

[0046] (2) Wire drawing

[0047] The wire rod is continuously drawn Ф4.90mm smooth steel wire by a straight wire drawing machine, and is drawn in 9 passes, with a single-pass compression rate of about 14% to 29%. The mold adopts direct water cooling, and there is no annealing treatment in the drawing process. ...

Embodiment 2

[0070] The implementation process of the Zn95Al5 alloy coated steel wire of 7mm-1960MPa in the present embodiment is as follows:

[0071] The wire rod is an ultra-pure, hypereutectoid high-carbon steel wire rod with a diameter of 15 mm and a toughening treatment in a water bath. The performance of the wire rod is the same as that in Example 1. The wire rod is continuously drawn Ф6.0mm smooth steel wire by a straight-in wire drawing machine, and is drawn in 9 passes, with a single-pass compression rate of about 14% to 29%; after each drawing, it is cooled by a water-cooled reel, and the wire rod is drawn The mold adopts direct water cooling, and there is no annealing treatment in the drawing process.

[0072] hot-dip treatment

[0073] Synchronous wire take-up and synchronous pay-off are adopted during the coating process. After the steel wire is assisted by plating, it is immersed in a pure galvanizing pot at a temperature of 450 ° C ~ 470 ° C to form a pure zinc coating and ...

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Abstract

The invention relates to a high-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for a bridge cable. A steel wire rod is an ultra-pure hyper-eutectoid steel high-carbon steel wire rod obtained after sorbite treatment (water bath, lead bath and salt bath), the strength of extension is larger than or equal to 1290 MPa, the area reduction rate is larger than or equal to 30%, and the elongation is larger than or equal to 10%; and the steel wire rod is drawn into a bright steel wire with the diameter ranging from 4.90 mm to 6.90 mm, then hot galvanizing zinc-aluminum alloy coating is carried out, and technological processes include lead bath degreasing, hot water washing, chlorohydric acid pickling, hot water washing, weak base washing, hot water washing, ammonium chloride and zinc chloride solvent plating assisting, hot-dip galvanizing-nitrogen smearing, zinc-aluminum alloy hot galvanizing, nitrogen smearing and wire collecting. The steel wire rod is subject to stabilization treatment, and the strength, the linearity, the relaxation rate and the steel wire axial homogeneity of the large-diameter ultrahigh-strength Zn95Al5 alloy coating steel wire are guaranteed.

Description

technical field [0001] The invention relates to a coated steel wire, in particular to a method for manufacturing a zinc-aluminum alloy coated steel wire for ultra-high strength and toughness durable bridge cables. Background technique [0002] Cables are the lifeline of bridges and the main stress-bearing components of long-span bridges, generally consisting of hundreds to tens of thousands of steel wires with a diameter of 5mm to 7mm. With the increase of the span of the bridge, the self-weight of the unit span of the steel cable will increase nonlinearly and accelerate, so that the total self-weight of the unit span of the cable bridge will also accelerate. The first result is that the proportion of the material strength of the cable used to bear its own weight increases, the proportion used to bear the load is relatively reduced, and the bearing efficiency is reduced; the second is that under the current steel wire strength, a larger cross-sectional area of ​​the cable is...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/38C22C38/02C22C38/04C22C38/20B21C1/02
CPCC23C2/06B21C1/02C22C38/02C22C38/04C22C38/20C23C2/38
Inventor 薛花娟赵军朱晓雄夏浩成王志刚
Owner JIANGSU FASTEN STEEL CABLE CO LTD
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