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Manufacturing method of zinc-aluminum alloy coated steel strand with medium-high aluminum content

A zinc-aluminum alloy and manufacturing method technology, which is applied in the direction of manufacturing tools, metal material coating technology, coating, etc., can solve the problems of reduced service life, strength and other mechanical properties that cannot meet the specification requirements, and achieve long service life and extension The effective working life and the effect of reducing the number of cable replacements

Inactive Publication Date: 2019-06-07
FASTEN HONGSHENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still the following defects in its design: because only 6 side wires are finished, although the galvanized aluminum alloy steel strands on the surface are more beautiful in appearance, because the center wire is not finished, the whole group of galvanized The mechanical properties such as the yield strength of the aluminum steel strand cannot meet the specification requirements, and there are defects that reduce the service life

Method used

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  • Manufacturing method of zinc-aluminum alloy coated steel strand with medium-high aluminum content
  • Manufacturing method of zinc-aluminum alloy coated steel strand with medium-high aluminum content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The manufacturing method of the 1860MPa-grade zinc-aluminum alloy-coated steel strand product for high-strength and durable bridge cables comprises the following steps:

[0047] (1) selection of wire rod

[0048] Special high-quality high-carbon steel wire rods are selected. The wire rods are ultra-pure, hypereutectoid steel high-carbon steel wire rods that have been sorbitized. The diameter of the wire rods is 13mm. Rate ≥ 30%. The chemical composition is calculated by mass percentage as C: 0.79-0.86%, Si: 0.15-0.35%, Mn: 0.60-0.90%, P≤0.025%, S≤0.025%, Cr≤0.35%, Cu≤0.20%, metallographic Satisfied with the structure: decarburization layer ≤ 0.07%, grain size 7, sorbite ≥ 85%, no martensite and reticular cementite structure; wire rod for decarburization layer depth inspection: total decarburization on one side of the wire rod The depth of the layer (ferrite + transition layer) shall not be greater than 1.5% of the nominal diameter of the wire rod.

[0049] (2) Pre-tr...

Embodiment 2

[0083] The method for preparing zinc-aluminum alloy coated steel strand with medium aluminum content, the steps are as follows

[0084] (1) selection of wire rod

[0085] Referring to Embodiment 1, the wire rod of Φ13mm is selected in this embodiment.

[0086] (2) Pre-treatment of wire rod

[0087] Specific steps include,

[0088] Pickling the wire rod, the concentration of hydrochloric acid in the pickling solution is 200g / L, the concentration of ferrous iron is 160g / L, pickling for 30min;

[0089] After washing with clean water, rinse with high-pressure water for 1 min;

[0090] Boronation: put the rinsed wire rod into the boronization tank for 20 minutes, the temperature of the boronization tank is higher than ≥90°C, and the boronization concentration is 110g / L;

[0091] Put the phosphating wire rod into the lime tank and keep it for 10 minutes. The pH value of the lime in the lime tank is ≥6 and the temperature is ≥90°C, and then the wire rod is air-dried.

[0092] (3...

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Abstract

The invention relates to a manufacturing method of a zinc-aluminum alloy coated steel strand with a medium-high aluminum content. The method comprises the following steps that hot galvanizing aluminumalloy is carried out after wire rod pretreatment, and the hot plating process comprises the following steps of degreasing heat of alkaline washing, degreasing of lead bath, thermal-water cleaning, hydrochloric acid pickling, water cleaning ammonium chloride zinc chloride solvent assistant plating, drying hot dip galvanizing, electromagnetic wiping, hot dip galvanizing aluminum alloy, nitrogen wiping, taking-up wire in sequence; a steel wire after being subjected to hot galvanizing aluminum is subjected to over-mold precise drawing, and the compression rate is controlled at 8-10 by percentage;finally stranded wire and stabilizing treatment are carried out to obtain the hot galvanized aluminum steel stranded wire, so that the strength, the linearity, the relaxation rate and the axial uniformity of the steel stranded wire of the high-strength alloy coated steel wire are ensured. On the basis of improving the corrosion resistance, the steel stranded wire with higher strength, higher toughness and better fatigue resistance is produced.

Description

technical field [0001] The invention relates to a method for manufacturing a zinc-aluminum alloy coated steel strand. Background technique [0002] At present, the market can only provide smooth steel strands or galvanized steel strands, or galvanized aluminum alloy steel strands with only 6 edge wire surface finishing. The steel strand is composed of 6 side wires and 1 central wire. The Chinese invention patent with the notification number CN104975528B discloses a method for making a zinc-aluminum alloy-coated prestressed steel strand. The produced steel strand is corrosion-resistant, steel The strength, toughness, fatigue resistance and service life of the stranded wire have all been improved qualitatively. However, there are still the following defects in its design: because only 6 side wires are finished, although the galvanized aluminum alloy steel strands on the surface are more beautiful in appearance, because the center wire is not finished, the whole group of galva...

Claims

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Application Information

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IPC IPC(8): C22C38/20C22C38/04C22C38/02C23G1/08C23C22/05C23C2/06C23C2/02C21D9/52B21C1/04
CPCD07B1/0693D07B2201/2011D07B2201/2059D07B2205/3053D07B2205/3057D07B2205/3071D07B2205/306D07B2205/3092D07B2501/203D07B2401/2025D07B2801/12D07B2801/10D07B2801/18
Inventor 金平吴建刚顾战费汉兵单继安姜平
Owner FASTEN HONGSHENG GRP CO LTD
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