Manufacturing method of zinc-aluminum alloy clad layer prestress steel strands

A prestressed steel strand, zinc-aluminum alloy technology, applied in the direction of metal material coating process, coating, hot dip plating process, etc., can solve the problem that the strength and toughness of steel wire cannot meet the strength, toughness, life, cable wire corrosion, etc. Difficult to check and other problems to achieve the effect of extending effective working life, prolonging service life and long service life

Active Publication Date: 2015-10-14
天津市新天钢钢线钢缆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, other manufacturers in the same field can only provide prestressed steel strands with smooth surface and no coating or pure zinc layer zinc-aluminum alloy coating. Due to the corrosion of the steel wire inside the cable, it is difficult to check and handle. Therefore, users are concerned about the problem of chemical corrosion resistance. Very concerned
[0003] However, the current hot-dip galvanized and then hot-dip galvanized steel wire with aluminum rare earth alloy layer has improved corrosion resistance, but the strength and toughness of the steel wire cannot meet the requirements of steel strands for bridge cables on strength, toughness, and service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of zinc-aluminum alloy coating prestressed steel strand of the present invention comprises the following steps:

[0034] 1. Select high-carbon steel wire rods, use hydrochloric acid to pickle the wire rods, wash away impurities such as floating rust and scale on the surface of the wire rods, and prepare for phosphating, and put the pickled wire rods into the phosphating pool For 5 minutes, the pyrophosphate solution at about 93°C in the phosphating pool will coat the surface of the wire rod with a dense phosphating film. The phosphating film has two functions, one is its own lubrication, and the other is its own lubrication. The special structure can bring lubricating powder into the wire drawing machine to enhance lubrication;

[0035] 2. Use the straight wire drawing machine to draw the wire rod in separate passes to obtain semi-finished steel wire.

[0036] 3. Carry out galvanizing operation on the steel wire obtained in step 2, and the runnin...

Embodiment 2

[0052] The preparation method of zinc-aluminum alloy coating prestressed steel strand of the present invention comprises the following steps:

[0053] 1. Select high-carbon steel wire rods, pickle the wire rods with hydrochloric acid, and then put the pickled wire rods into the phosphating pool for 4 minutes. The surface is coated with a dense phosphating film;

[0054] 2. Use the straight wire drawing machine to draw the wire rod in separate passes to obtain semi-finished steel wire.

[0055] 3. Carry out galvanizing operation to the steel wire obtained in step 2, and the running speed is 27m / min. The specific steps are:

[0056] (1) Put the full steel wire I-shaped wheel on the pay-off bracket, and the steel wire first enters the open flame furnace. The open flame furnace is filled with lead liquid at a temperature of about 442°C. Remove the grease remaining on the surface of the steel wire, and at the same time improve the steel wire after drawing. organization;

[0057]...

Embodiment 3

[0071] The preparation method of zinc-aluminum alloy coating prestressed steel strand of the present invention comprises the following steps:

[0072] 1. Select high-carbon steel wire rods, pickle the wire rods with hydrochloric acid, and then put the pickled wire rods into the phosphating pool for 4 minutes. The surface of the strip is coated with a dense phosphating film;

[0073] 2. Use the straight wire drawing machine to draw the wire rod in separate passes to obtain semi-finished steel wire.

[0074] 3. Carry out galvanizing operation on the steel wire obtained in step 2, and the running speed is 23m / min. The specific steps are:

[0075] (1) Put the full steel wire I-shaped wheel on the pay-off bracket, and the steel wire enters the open flame furnace first, and the open flame furnace is filled with lead liquid at a temperature of about 450 ° C, to remove the residual grease on the surface of the steel wire, and at the same time improve the steel wire after drawing org...

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Abstract

The invention discloses a manufacturing method of zinc-aluminum alloy clad layer prestress steel strands. Firstly, high-carbon steel wire rods are selected and subjected to acid pickling, parkerising and drawing in sequence and then subjected to galvanization, the line moving speed is 20-28 m / min, steel wires enter an open-fire furnace so that the organization of the steel wires can be improved, and the steel wires are subjected to alkaline washing, water washing, acid pickling and water washing in sequence; secondly, the steel wires are subjected to assistant plating, drying and galvanization operation in sequence; thirdly, assistant plating, drying and zinc-aluminum alloy layer galvanizing are conducted, the steel wires are subjected to finishing, stranding and stabilizing, and then the steel strands are manufactured. Compared with the prior art, the manufacturing method of the zinc-aluminum alloy clad layer prestress steel strands has the advantages that on the basis of improving the corrosion prevention capability, the steel strands with higher strength, higher tenacity and better anti-fatigue performance can be produced, qualitative improvement is made on the aspects of corrosion resistance, strength, tenacity, anti-fatigue performance and service life of the steel strands, and the effective service life of the steel strands in the bridge building is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of steel strand preparation, and in particular relates to a method for manufacturing a zinc-aluminum alloy coated prestressed steel strand. Background technique [0002] At present, other manufacturers in the same field can only provide prestressed steel strands with smooth surface and no coating or pure zinc layer zinc-aluminum alloy coating. Due to the corrosion of the steel wire inside the cable, it is difficult to check and handle. Therefore, users are concerned about the problem of chemical corrosion resistance. Very concerned. [0003] However, the current hot-dip galvanized and then hot-dip galvanized steel wire with aluminum rare earth alloy layer has improved corrosion resistance, but the strength and toughness of the steel wire cannot meet the requirements of steel strands for bridge cables on strength, toughness, and service life. . [0004] Experts predict that future long-span bridges will cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06C23C2/06C23C2/38C23C2/02B21C1/02
CPCC23C2/02C23C2/06C23C2/38D07B1/0693D07B2201/2011D07B2205/3071D07B2801/18
Inventor 王雅志翟巧玲杨同敬王志永苏子波刘毅孔庆林王俊王国良俞振根李鹏宋俊强金鑫
Owner 天津市新天钢钢线钢缆有限公司
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