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A kind of hot-dip galfan alloy steel pipe and its preparation method and equipment

A technology of alloy steel pipe and hot-dip plating, which is applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems of increasing the difficulty of Galfan alloy and short hot-dip time, so as to reduce the competitive advantage and achieve good environmental protection effect , good environmental protection effect

Active Publication Date: 2020-06-09
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For slender products with inner holes, plus the time is controlled by the galvanizing unit, the hot-dip time is short and cannot be lengthened arbitrarily, which increases the difficulty of hot-dip Galfan alloy steel pipes

Method used

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  • A kind of hot-dip galfan alloy steel pipe and its preparation method and equipment
  • A kind of hot-dip galfan alloy steel pipe and its preparation method and equipment
  • A kind of hot-dip galfan alloy steel pipe and its preparation method and equipment

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preparation example Construction

[0036] The preparation method (hereinafter referred to as method) of hot-dip Galfan alloy steel pipe of the present invention, the process of this method is:

[0037] The welded pipe is pre-treated and rust-removed, washed with water, then assisted plating, and then dried after the assisted plating. The dried steel pipe is hot-plated Galfan alloy. After hot-galvanizing Galfan alloy, it is wiped with internal and external air knives. Form a bright and stable coating; then, water cooling, passivation, trimming, and finally packaging are carried out in sequence to complete the process of hot-dip Galfan alloy for the entire steel pipe;

[0038] Among them, the soaking time of the steel pipe in the plating flux is 10-15s during the fluxing, so that the surface reaches a uniform dark gray; the mass percentage of each component of the fluxing agent used is: ZnCl 2 10-20%; SnCl 2 2-4%; 38% hydrochloric acid 1-3%; KF 1-3%; NaBr 1-2%; BiOCl 0.5-1%; the rest is water;

[0039] When hot...

Embodiment 1

[0055] The product in this implementation is a steel pipe with a diameter of 2 inches hot-dip Galfan alloy, and the zinc content is required to be 50-60g / m 2 .

[0056] Pickling rust removal method is adopted, the process is:

[0057] After the steel pipe is pre-treated by pickling, it is coated with a special flux, the flux temperature is 75°C, the drying temperature is 240°C, and the drying time is 12 seconds, and the Galfan alloy is hot-plated. The hot-dip temperature is 450°C, the time is 12 seconds, the wiping gas blown out is compressed air, and the pressure is 2.5kg / cm 2 . The wiping gas blown inside is superheated saturated steam with a pressure of 8kg / cm 2 . Wipe with internal and external air knives, form a bright and stable coating in the air, then cool and passivate to obtain the finished product.

[0058] The equipment for hot-dip Galfan alloy steel pipe in this embodiment includes a drying furnace, a hot-dip galvanizing pot and a post-treatment tank. The hot...

Embodiment 2

[0078] The steel pipe with a diameter of 2 inches in this implementation is hot-dip Galfan alloy, and the zinc content is required to be 50-60g / m 2 .

[0079] The shot blasting method is adopted, and the process is:

[0080] The steel grit used for shot blasting inside and outside the steel pipe is S70, and the steel pipe after shot blasting is placed on the production line for other processes. Activation is carried out with hydrochloric acid with a mass concentration of 3%, and the formulation of the plating flux is the same as in Example 1. The hot-dip temperature is 465°C, the hot-dip time is 12 seconds, and the blowing pressure is 3kg / cm 2 , the blowing pressure is 8.5kg / cm 2 . Then after cooling, passivation, finished product.

[0081] After testing, the zinc content of the obtained galvanized steel pipe is 58g / m 2 .

[0082] The following is a comparison of the corrosion resistance performance test results of hot-dip Galfan alloy and hot-dip galvanizing for the fo...

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Abstract

The invention relates to a Galfan alloy hot-dipped steel pipe as well as a preparation method and equipment thereof. Each of inner and outer surface layers of the steel pipe is covered with one layerof Galfan alloy; the thickness of the Galfan alloys on the inner and outer surface layers is 2 to 50mu m. According to the method provided by the invention, the Galfan alloys are used for replacing pure metal zinc to be used as a steel pipe hot dipping material; a special dipping assisting agent is adopted and all technological parameters of dipping assisting and hot dipping are strictly controlled and the Galfan alloy hot-dipped steel pipe is obtained. The special dipping assisting agent is prepared from the following components: 10 to 20 percent of ZnCl2, 2 to 4 percent of SnCl2, 1 to 3 percent of 38 percent hydrochloric acid, 1 to 3 percent of KF, 1 to 2 percent of NaBr, 0.5 to 1 percent of BiOCl and the balance of water. According to the Galfan alloy steel pipe provided by the invention, the corrosion resistance, the aesthetic feeling and the profit space can be remarkably improved. The equipment mainly relates to a large-size inner heating ceramic zinc pot; the equipment has absolute corrosion resistance so that the possibility of hotly dipping the Galfan alloy on the steel pipe is provided.

Description

technical field [0001] The invention relates to the technical field of hot-dip steel pipes in metal products in the metallurgical industry, in particular to a hot-dip Galfan alloy steel pipe and a preparation method and equipment thereof. Background technique [0002] Hot-dip galvanizing of metal products is one of the most basic and effective anti-corrosion processes. Hot-dip galvanized metal products include steel wire, steel pipe, steel coil, steel strip, steel structure, miscellaneous parts, fasteners, etc. According to the continuous degree of galvanizing, the galvanizing process is divided into continuous galvanizing and batch galvanizing. Among them, steel wire, steel coil, steel strip, etc. belong to continuous galvanizing; steel structure, standard parts, miscellaneous parts and steel pipes belong to batch galvanizing. The continuous galvanizing process is divided into solvent method and redox method, and the latter is not within the scope of this patent. Batch g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/38C23C2/02
CPCC23C2/003C23C2/02C23C2/06C23C2/385
Inventor 于富强曹博皓
Owner TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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