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Manufacturing method of galvanized special-shaped steel pipe

A special-shaped steel pipe and a manufacturing method technology, which are applied in hot-dip plating process, coating, metal material coating process and other directions, can solve the problems of poor adhesion of zinc layer, discontinuous galvanized layer on the surface of high-strength steel pipe, uneven color and so on , to achieve the effect of strong adhesion of zinc layer, saving process and uniform color.

Inactive Publication Date: 2019-03-05
长兴合联精密金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the hot-dip galvanizing method for special-shaped steel pipes in the prior art, there will be spot-like missing plating on the surface of special-shaped steel pipes, and the galvanized layer on the surface of high-strength steel pipes is discontinuous and uneven in color. , the adhesion of the zinc layer is poor, especially at the bend of special-shaped steel pipes. A method for manufacturing galvanized special-shaped steel pipes is provided. The drawing process of special-shaped steel pipes and the galvanizing process are carried out at the same time, saving part of the process. The production cost is reduced, and the galvanized layer of the special-shaped steel pipe produced is continuous and complete, the color is uniform, and the zinc layer has strong adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for manufacturing a galvanized special-shaped steel pipe, comprising the steps of:

[0022] 1) Lubricate the surface of the round steel pipe;

[0023] 2) Put the round steel pipe into the pushing device, push it forward, so that the front end of the round steel pipe smoothly passes through the die hole of the drawing mold and protrudes 25cm, and then draws and forms;

[0024] 3) Then put the steel pipe into a 10% hydrochloric acid aqueous solution and soak for 3 hours;

[0025] 4) Putting the steel pipe into a zinc chloride solution with a concentration of 50% and soaking for 3 hours;

[0026] 5) hot-dip galvanizing the steel pipe at a temperature above 580°C, the zinc solution for galvanizing is composed of: 0.09% lead, 0.08% antimony, 0.06% tin, 0.04% cadmium, and the balance is zinc;

[0027] 6) The steel pipe was taken out, purged with ammonium chloride, and cooled with water at a temperature of 10° C. to obtain a galvanized special-shaped steel pipe with...

Embodiment 2

[0029] A method for manufacturing a galvanized special-shaped steel pipe, comprising the steps of:

[0030] 1) Lubricate the surface of the round steel pipe;

[0031] 2) Put the round steel pipe into the pushing device, push it forward, so that the front end of the round steel pipe smoothly passes through the die hole of the drawing die and protrudes 40cm, and then draws and forms;

[0032] 3) Then put the steel pipe into a 5% hydrochloric acid aqueous solution and soak for 1 hour;

[0033] 4) Put the steel pipe into the zinc chloride solution with a concentration of 40% and soak for 1 hour;

[0034] 5) hot-dip galvanizing the steel pipe at a temperature above 580°C, the zinc solution for galvanizing is composed of: 0.08% lead, 0.07% antimony, 0.05% tin, 0.03% cadmium, and the balance is zinc;

[0035] 6) The steel pipe was taken out, purged with ammonium chloride, and cooled with water at a temperature of 10° C. to obtain a galvanized special-shaped steel pipe with a zinc l...

Embodiment 3

[0037] A method for manufacturing a galvanized special-shaped steel pipe, comprising the steps of:

[0038] 1) Lubricate the surface of the round steel pipe;

[0039] 2) Put the round steel pipe into the pushing device and push it forward, so that the front end of the round steel pipe smoothly passes through the die hole of the drawing die and protrudes 30cm, and then is drawn and formed;

[0040] 3) Then put the steel pipe into the hydrochloric acid aqueous solution with a concentration of 6% and soak for 2 hours;

[0041] 4) Putting the steel pipe into a zinc chloride solution with a concentration of 45% and soaking it for 2 hours;

[0042] 5) Hot-dip galvanizing the steel pipe at a temperature above 580°C. The zinc solution for galvanizing is composed of: 0.085% lead, 0.075% antimony, 0.05% tin, 0.04% cadmium, and the balance is zinc;

[0043] 6) The steel pipe was taken out, purged with ammonium chloride, and cooled with water at a temperature of 15° C. to obtain a galva...

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Abstract

The invention relates to the technical field of special-shaped steel pipes, in particular to a manufacturing method of a galvanized special-shaped steel pipe. The manufacturing method of the galvanized special-shaped steel pipe comprises the following steps that 1) a round steel tube is subjected to surface lubrication treatment; 2) the round steel tube is placed in a material pushing device, theround steel tube is pushed forwards, so that the front end of the round steel tube smoothly passes through a die hole of a drawing die and extends out of 25-40 cm, and then drawing and forming is carried out; 3) then the steel tube is put into a hydrochloric acid aqueous solution with the concentration of 5-10% for soaking for 1-3 hours; 4) the steel tube is put into a zinc salt solution with theconcentration of 40-50%, and soaking is carried out for 1-3 hours; 5) hot-dip galvanizing treatment is performed on the steel pipe under a temperature condition of 580 DEG C or above; and 6) the steelpipe is taken out, and cooling is carried out to obtain the galvanized special-shaped steel pipe. According to the manufacturing method of the galvanized special-shaped steel pipe, a drawing processand a galvanized process of the special-shaped steel pipe are simultaneously carried out, the production cost is reduced, a galvanized layer is continuous and complete, the color and luster are uniform, and the galvanized layer adhesiveness is high.

Description

technical field [0001] The invention relates to the technical field of special-shaped steel pipes, in particular to a method for manufacturing galvanized special-shaped steel pipes Background technique [0002] The plastic-lined composite pipe currently on the market is mainly composed of a plastic inner pipe and a metal outer pipe, in which the metal outer pipe is tightly coated on the outer wall of the plastic inner pipe. problems, but it also has many shortcomings. [0003] In the existing hot-dip galvanizing method for special-shaped steel pipes, there will be spot-like missing coatings on the surface of special-shaped steel pipes, the galvanized layer on the surface of high-strength steel pipes is discontinuous, the color is uneven, and the adhesion of the zinc layer is poor, especially on special-shaped steel pipes. of the bend. Contents of the invention [0004] The technical problem to be solved by the present invention is: in order to overcome the hot-dip galvan...

Claims

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Application Information

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IPC IPC(8): B21C23/08C22C18/00C23C2/02C23C2/06C23C2/38
CPCB21C23/08C22C18/00C23C2/02C23C2/06C23C2/38
Inventor 不公告发明人
Owner 长兴合联精密金属科技有限公司
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