CN86106745A - The production technology of galvanized welded pipe - Google Patents
The production technology of galvanized welded pipe Download PDFInfo
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- CN86106745A CN86106745A CN 86106745 CN86106745A CN86106745A CN 86106745 A CN86106745 A CN 86106745A CN 86106745 CN86106745 CN 86106745 CN 86106745 A CN86106745 A CN 86106745A CN 86106745 A CN86106745 A CN 86106745A
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- zinc
- welded pipe
- galvanized
- pipe
- production technology
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Abstract
The production technology of galvanized welded pipe is to adopt to plate earlier the flow process of afterwards welding.Promptly first galvanizing by dipping behind hot rolled steel plate becomes zinc-plated steel band with zinc-plated roll bending slitting again, is welded into pipe with high-frequency electrical.Outside weld is made spray zinc with the zinc spray apparatus and is handled, and inside weld need not be handled, and can obtain meeting the galvanized welded pipe of national Specification.The present invention has abolished the operation of serious environment pollutions such as pickling, has simplified production procedure, and product surface is smooth, and zinc coat is even, and has reduced the consumption of zinc.
Description
The invention belongs to low-pressure fluid and carry the production technology of using galvanized welded pipe (hereinafter to be referred as galvanized welded pipe).
The production technology of current domestic and international galvanized welded pipe, all be that the hot-rolled coil that adopts the steel trade mark and chemical composition to meet the welded tube standard is raw material, slitting becomes steel band, and the pipe crimping moulding becomes pipe through stove weldering or electric welding, wipe outside weld off, surface film oxide or rusty scale are removed in pickling before the plating, and heat, cold water clean up, and do the solvent processing and make its surface active, dry, galvanizing by dipping, water cooling, test package dispatches from the factory.This technological process can abbreviate " first postwelding plating " as.For example, the production technology of the alleged galvanized welded pipe of China GB3091-82 standard is exactly this flow process; The alleged galvanized welded pipe of Japan's JISG3442 standard also is to adopt this technological process, and other countries such as the U.S., the Soviet Union are also all like this.From above-mentioned flow process as can be known, the operation that prior art is produced galvanized welded pipe is more numerous and diverse, and because pickling, solvent is handled, operation such as zinc-plated brings certain pollution for the outer social environment of production environment even factory, the rising that is directly proportional with increase galvanized welded pipe output again of this pollution level, especially some are thinked little of or ignore the medium-sized and small enterprises of the recovery of three wastess(waste gas,waste water and industrial residue), pollution on the environment is more outstanding.
The production technology that the purpose of this invention is to provide the different galvanized welded pipe of a kind of and above-mentioned technology, abolish Welded Pipe Plant and adopt that the existing requisite pickling of production technology, solvent are handled, the production process that environment is polluted such as zinc-plated, simplify the production procedure of galvanized welded pipe, enlarge welded tube production capacity to realize not extending a factory building, and thoroughly radical cure has Welded Pipe Plant now because the environmental pollution that operations such as pickling cause.
The zinc-plated hot-rolled coil that the present invention adopts the steel trade mark and chemical composition to meet the welded tube standard is raw material, slitting becomes zinc-plated steel band, the pipe crimping moulding adopts specific high frequency (contact or induction) electric welding to become pipe, wipe outside weld off, with the zinc spray equipment outside weld is sprayed the zinc layer, can obtain galvanized welded pipe.This technological process of the present invention can abbreviate " plate afterwards earlier and weld " as, " plating " this ring is finished working continuously on streamline behind the rolled plate by steel manufacturer, be to make full use of existing device to carry out, concerning a large-scale iron and steel enterprise, be easy to accomplish.
The present invention " plates afterwards earlier and welds " with corresponding prior art " first postwelding plating " and compares, and is the difference on the raw material selection, because this difference causes the reform of galvanized welded pipe technology.Can make this reform become possibility, be welded into when pipe, must zinc-platedly can not make inside weld obtain the know-how of zinc coat and the technology that outside weld is wipeed back spray zinc protective layer off exactly invented with galvanized steel strip.
Find from the welding mechanism of studying existing solder technology, high frequency (contact or induction) electric welding, only make the weldment local realization of high temperature melting metal rapidly welding in the commissure, for zinc-plated weldment, weld seam both sides zinc coat melted by heat is collected in down face of weld, if make pipe with galvanized steel strip, inner surface compression during moulding, coating thickens in the pipe seam both sides, adopts specific high-frequency welding, and inside weld is in the high-frequency welding process, evenly flow on the inside weld after the zinc coat fusing of weld seam both sides, facts have proved that the zinc layer on the inside weld is thicker than the former zinc coat of pipe surfaces externally and internally, inside weld must any processing and can be reached quality standards.The zinc spray equipment of outside weld is also very simple, by 1 1.5m
3Acetylene generator, 1 bottle of oxygen cylinder, 1 1.5m
3Air compressor is formed, and oxy arc is sprayed into zinc liquid end by air compressor machine and is coated on the outside weld of strickling by nozzle scorification 3mm zinc silk commonly used.The condition of work of zinc spray apparatus is during spraying zinc liquid: air compressor machine pressure 4～6kg/Cm
2, oxygen pressure is 4～6kg/Cm
2, acetylene pressure is 1～1.4kg/Cm
2
The present invention has obtained gratifying effect through Wuhan steel plant and the test of Hanchuan, Hubei Welded Pipe Plant.Wuhan Iron and Steel Plant is produced the hot rolled steel plate of thick 2.75mm by standard GB 3092-82 requirement, adopts prior art to carry out galvanizing by dipping and becomes zinc-plated roll bending, and this process is to finish on automatic production line entirely.
The zinc-plated roll bending of 2.75mm that Hanchuan Welded Pipe Plant is test-manufactured with Wuhan Iron and Steel Plant, slitting becomes galvanized steel strip, erases plate surface protection oil reservoir through oil spreading device, send into the electric welding of high-frequency welding unit and become pipe, wipe outside weld off, adopt zinc spray apparatus of the present invention to carry out outside weld spraying zinc layer, length saw quality inspection down in accordance with regulations.
Product that the present invention obtains (galvanized welded pipe) carries out the quality mark to projects and tests through by the quality inspection method of standard GB 3091-82 defined: the zinc coat uniformity, and through cupric sulphate impregnating test 5 times, galvanized welded pipe does not redden, and meets national standard; The pipe of 1/2 inch internal diameter of cold bending test is not with crooked 90 ° of charges, and weld seam places the bending direction outside, does not have crack and plating exfoliation phenomenon, meets national standard; 40kgf/Cm is born in the water pressure test
2Pressure does not split, and surpasses national standard 20kgf/Cm
2; Galvanizing layer weight, because of adopting zinc-aluminium-Xi ternary alloy three-partalloy immersion plating, zinc consumption significantly reduces, and is 200～275g/Cm
2, with GB3091-82(500g/Cm
2) the standard ratio, half is many to save the zinc amount; Smooth surface does not have zinc-plated blackspot or bubble, and except that inside and outside commissure was slightly coarse, the part did not have list edge.
The present invention compares the significant superiority of tool: the first, simplified the existing production procedure of galvanized welded pipe as described above, made Welded Pipe Plant can increase substantially galvanized welded pipe output on the existing equipment basis with corresponding prior art.The second, abolish operations such as the zinc-plated and plating pre-treatment of Welded Pipe Plant, improved production and social environment greatly, thoroughly effected a radical cure and produced the environmental pollution that is caused with prior art.The 3rd, the galvanized welded pipe of producing with Isoquant can be a large amount of metallic zinc of country's saving, to produce 200000 tons of galvanized welded pipes per year, can save 1.3 ten thousand tons of metallic zinc.The 4th, tangible economic benefit is arranged, can reach nearly 8,400 ten thousand yuan to produce 200000 tons of galvanized welded pipe estimations per year.
(1) saving 1.3 ten thousand tons on zinc, in 3000 yuan/ton, is 39,000,000 yuan;
(2) improving 8000 tons of volume recoveries, in 1500 yuan/ton, is 12,000,000 yuan;
(3) reduce import tubing, save 3,000 ten thousand dollars of foreign exchanges, sheet material is saved 1,500 ten thousand dollars of foreign exchanges, and every dollar to subsidize 0.4 yuan, 18,000,000 yuan saving subsidies;
(4) save about 1,000 ten thousand yuan of acid and other materials etc.;
(5) save 5,000,000 yuan of equipment change expenses.
Claims (3)
1, a kind of low-pressure fluid is carried the production technology with galvanized welded pipe, it is characterized in that adopting hot rolled steel plate earlier zinc-plated, and slitting becomes zinc-plated steel band to be welded into pipe then, and outside weld is with spraying zinc device spray zinc.
2, the production technology of galvanized welded pipe according to claim 1 is characterized in that adopting high frequency (contact or induction) electric welding to weld.
3, the production technology of galvanized welded pipe according to claim 1 is characterized in that adopting scorification zinc silk to spray on the outside weld of strickling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106745 CN86106745A (en) | 1986-10-04 | 1986-10-04 | The production technology of galvanized welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106745 CN86106745A (en) | 1986-10-04 | 1986-10-04 | The production technology of galvanized welded pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86106745A true CN86106745A (en) | 1987-04-29 |
Family
ID=4803346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86106745 Pending CN86106745A (en) | 1986-10-04 | 1986-10-04 | The production technology of galvanized welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86106745A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265694B (en) * | 2008-04-25 | 2010-06-02 | 李琳 | Jet printing type steel guard rail |
| CN103302134A (en) * | 2013-05-31 | 2013-09-18 | 湖南省金为型材有限公司 | Process for manufacturing zinc steel pipe section |
| CN110587321A (en) * | 2019-09-27 | 2019-12-20 | 杭州越阳伞业有限公司 | Production process of special-shaped household pipe |
| CN116060892A (en) * | 2023-03-07 | 2023-05-05 | 杭州金固环保设备科技有限公司 | Hot dip galvanized steel pipe and continuous production method thereof |
-
1986
- 1986-10-04 CN CN 86106745 patent/CN86106745A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265694B (en) * | 2008-04-25 | 2010-06-02 | 李琳 | Jet printing type steel guard rail |
| CN103302134A (en) * | 2013-05-31 | 2013-09-18 | 湖南省金为型材有限公司 | Process for manufacturing zinc steel pipe section |
| CN110587321A (en) * | 2019-09-27 | 2019-12-20 | 杭州越阳伞业有限公司 | Production process of special-shaped household pipe |
| CN116060892A (en) * | 2023-03-07 | 2023-05-05 | 杭州金固环保设备科技有限公司 | Hot dip galvanized steel pipe and continuous production method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |