CN105385815A - Production process for hot-dip galvanized steel plate - Google Patents
Production process for hot-dip galvanized steel plate Download PDFInfo
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- CN105385815A CN105385815A CN201510849203.2A CN201510849203A CN105385815A CN 105385815 A CN105385815 A CN 105385815A CN 201510849203 A CN201510849203 A CN 201510849203A CN 105385815 A CN105385815 A CN 105385815A
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Abstract
The invention provides a production process for a hot-dip galvanized steel plate, and relates to the technical field of metal machining. The production process includes the steps of plate surface processing, annealing, hot galvanizing, curing and aftertreatment. The step of plate surface processing includes the sub-steps of dry blowing, wet scrubbing, high-pressure water flushing, electrolysis scrubbing and spraying scrubbing; according to dry blowing, an air blowing gun is used for blowing air to the surface of the steel plate so as to primarily remove adhering objects and dust on the plate surface; according to wet scrubbing, after alkali liquor is sprayed on the plate surface, a scrubbing roller is used for scrubbing the steel plate 1-2 times for further dust removal, impurity removal and oil removal; according to electrolysis scrubbing, the steel plate is placed in an electrolytic cell with two pairs of electrodes for electrolysis, and after electrolysis, a scrubbing roller is used for scrubbing the steel plate 1-2 times. The production process has the beneficial effects that the production cost can be lowered, operation is easy, and product quality is good; moreover, production is stable, the galvanizing effect is good, zinc is not prone to falling off, and anti-rusting capacity is high.
Description
Technical field
The present invention relates to metal working technical area, especially a kind of production technique of galvanizing steel plate.
Background technology
A lot of country notices the seriousness of " corrosion " very early, according to estimates, because of the loss that corrosion protection causes, within 1 year, about reaches 3.5 ﹪ of gross national product (GNP) in Japan.In the U.S., this ratio is 4.2 ﹪, is 3.5 ﹪ in Britain, and Germany is 3 ﹪.So advanced country has all set up relevant anticorrosive technique research institution, to take various effective measures, avoid or reduce its loss.
Galvanizing is galvanizing again, as the effective anti-corrosion of metal mode of one, has been widely used on the metal construction facility of every profession and trade.Galvanizing be by rust cleaning after steel beam column immerse in the zinc liquid of about 600 DEG C high temperature melt, make steel beam column surface attachment zinc layers, zinc coating thickness must not be less than 65 μm to 5mm with lower thin sheet, is not less than 86 μm to slab, thus plays etch-proof object.Durable years is long, manufacture degree is high owing to possessing for galvanizing steel plate, steady quality etc. is a little multiple, thus by a large amount of in the outdoor steel structure by atomospheric corrosion more seriously and not easy-maintaining, as a large amount of electric transmission pole tower, communications tower etc.But under prior art, improper due to production technology method, it is many or have dew iron phenomenon that the galvanizing steel plate of production there will be gloomy, the surperficial zinc granule in lower, the surperficial local area of hardness, and yield rate is not high, increases Financial cost, reduces productive profit.
Summary of the invention
Instant invention overcomes shortcoming of the prior art, provide a kind of production technique of galvanizing steel plate, can not only reduce production cost, simple to operate, good product quality, and administration measure, zinc-plated is effective, is not easy to come off, and rust-proofing ability is strong.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A production technique for galvanizing steel plate, comprises the process of plate face, annealing, pot galvanize, solidification and aftertreatment;
The process of described plate face comprise dryly to blow, moisteningly to scrub, high pressure water washing, electrolysis is scrubbed and spray is scrubbed, described dry blow refer to jet gun jet to surface of steel plate, by plate face stick thing and dust is tentatively removed; Described moistening scrub refer to and with alkali lye, plate face sprayed after, with brush roll, 1 ~ 2 time is scrubbed to steel plate, does further dedusting, removal of impurities and degreasing; The electrolyzer electrolysis referring to and to be put into by steel plate with 2 pairs of electrodes is scrubbed in described electrolysis, scrubs 1 ~ 2 time after electrolysis with brush roll to steel plate;
Iron and steel is heated to 760 ~ 780 DEG C by described annealing process furnace, soaking 730 ~ 740 DEG C, insulation 15 ~ 20s; Described pot galvanize refer to the method for blowing a cold wind over by heating after steel plate drop to 540 ~ 550 DEG C by the speed of 20 ~ 25 DEG C/s, put in the zinc liquid of 475 ~ 485 DEG C soak 20 ~ 25s;
Described solidification refers to that the steel plate taken out from zinc liquid is put into temperature to be 300 ~ 350 DEG C, to use in the holding furnace of infrared heating, and storage period is 20 ~ 30 minutes;
Described aftertreatment comprises cooling, polishing, straightening, passivation and batches, described cooling comprises air-cooled and water-cooled, air-cooled referring to uses the freezing air containing 5 ~ 8% nitrogen directly to blow plate face, the temperature of zinc steel plate is made to be down to 100 ~ 200 DEG C, described water-cooled refers to and is immersed in completely in water by zinc steel plate, and the temperature of zinc steel plate is down to 50 ~ 60 DEG C.
Further, described dry blowing refers to that the gas with pressure is 10 ~ 12MPa carries out purge 2 ~ 3 times to often opening surface of steel plate, and the time often all over purge is 5 ~ 10 minutes.
Further, described alkali lye refers to by sodium hydroxide powder, second alcohol and water by the formulated alkaline liquid of the mass ratio of 1:05:20, the manner of formulation of described alkali lye is, first by after second alcohol and water mixing and stirring, be heated to 40 ~ 60 DEG C, pour sodium hydroxide powder again into stir, maintain the temperature at 30 ~ 50 DEG C of reaction 20 ~ 30min and form.
Further, described polishing refers to and first sprays zinc surface of steel plate with clear water, after rinsing with the surface of de-salted water to zinc steel plate again, put in hydraulic pressure four roller wet type polishing machine, setting polishing pressure is 1700 ~ 1900kN, and with high pressure demineralized water, the working roll in polishing machine is sprayed in polishing process, remove cadmia; always Also with clear water, zinc steel plate surface is sprayed after polishing, remove and stick thing.
Further, described passivation refers to concentration the surface being applied to zinc steel plate of the three oxidation network dissolution homogeneity being 1.2%, then described zinc steel plate is placed on temperature is dry 10 ~ 15min under the environment of 40 ~ 60 DEG C at once, more naturally places 30 ~ 40min under normal temperature.
Compared with prior art, the invention has the beneficial effects as follows:
The production technique of a kind of galvanizing steel plate of the present invention, not only step is simple, and fraction defective is low, and constant product quality, reduces zinc-plated technology difficulty simultaneously, cost-saving, enhances productivity.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
A production technique for galvanizing steel plate, comprises the process of plate face, annealing, pot galvanize, solidification and aftertreatment;
The process of plate face comprise dryly to blow, moisteningly to scrub, high pressure water washing, electrolysis is scrubbed and spray is scrubbed, dry blow refer to jet gun jet to surface of steel plate, by plate face stick thing and dust is tentatively removed; Moistening scrub refer to and with alkali lye, plate face sprayed after, with brush roll, 1 time is scrubbed to steel plate, does further dedusting, removal of impurities and degreasing; The electrolyzer electrolysis referring to and to be put into by steel plate with 2 pairs of electrodes is scrubbed in electrolysis, scrubs 2 times after electrolysis with brush roll to steel plate;
Iron and steel is heated to 770 DEG C by annealing process furnace, soaking 735 DEG C, insulation 18s; Pot galvanize refer to the method for blowing a cold wind over by heating after steel plate drop to 545 DEG C by the speed of 22 DEG C/s, put in the zinc liquid of 480 DEG C and soak 23s;
Solidification refers to that the steel plate taken out from zinc liquid is put into temperature to be 330 DEG C, to use in the holding furnace of infrared heating, and storage period is 25 minutes;
Aftertreatment comprises cooling, polishing, straightening, passivation and batches, cooling comprises air-cooled and water-cooled, and air-cooled referring to uses the freezing air containing 6% nitrogen directly to blow plate face, makes the temperature of zinc steel plate be down to 150 DEG C, water-cooled refers to and is immersed in completely in water by zinc steel plate, and the temperature of zinc steel plate is down to 55 DEG C.
Further, dry blowing refers to that the gas with pressure is 11MPa carries out purge 2 times to often opening surface of steel plate, and the time often all over purge is 8 minutes.
Further, alkali lye refers to by sodium hydroxide powder, second alcohol and water by the formulated alkaline liquid of the mass ratio of 1:05:20, the manner of formulation of alkali lye is, first by after second alcohol and water mixing and stirring, be heated to 50 DEG C, pour sodium hydroxide powder again into stir, maintain the temperature at 40 DEG C of reaction 25min and form.
Further, polishing refers to and first sprays zinc surface of steel plate with clear water, after rinsing with the surface of de-salted water to zinc steel plate again, put in hydraulic pressure four roller wet type polishing machine, setting polishing pressure is 1800kN, and with high pressure demineralized water, the working roll in polishing machine is sprayed in polishing process, remove cadmia; always Also with clear water, zinc steel plate surface is sprayed after polishing, remove and stick thing.
Further, passivation refers to concentration the surface being applied to zinc steel plate of the three oxidation network dissolution homogeneity being 1.2%, and then zinc steel plate is placed on temperature is dry 13min under the environment of 50 DEG C at once, more naturally places 35min under normal temperature.
Last it is noted that these are only the preferred embodiments of the present invention; be not limited to the present invention; although with reference to embodiment to invention has been detailed description; for a person skilled in the art; it still can be modified to the technical scheme described in foregoing embodiments; or equivalent replacement is carried out to wherein portion of techniques feature; but it is within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a production technique for galvanizing steel plate, is characterized in that, comprises the process of plate face, annealing, pot galvanize, solidification and aftertreatment;
The process of described plate face comprise dryly to blow, moisteningly to scrub, high pressure water washing, electrolysis is scrubbed and spray is scrubbed, described dry blow refer to jet gun jet to surface of steel plate, by plate face stick thing and dust is tentatively removed; Described moistening scrub refer to and with alkali lye, plate face sprayed after, with brush roll, 1 ~ 2 time is scrubbed to steel plate, does further dedusting, removal of impurities and degreasing; The electrolyzer electrolysis referring to and to be put into by steel plate with 2 pairs of electrodes is scrubbed in described electrolysis, scrubs 1 ~ 2 time after electrolysis with brush roll to steel plate;
Iron and steel is heated to 760 ~ 780 DEG C by described annealing process furnace, soaking 730 ~ 740 DEG C, insulation 15 ~ 20s;
Described pot galvanize refer to the method for blowing a cold wind over by heating after steel plate drop to 540 ~ 550 DEG C by the speed of 20 ~ 25 DEG C/s, put in the zinc liquid of 475 ~ 485 DEG C soak 20 ~ 25s;
Described solidification refers to that the steel plate taken out from zinc liquid is put into temperature to be 300 ~ 350 DEG C, to use in the holding furnace of infrared heating, and storage period is 20 ~ 30 minutes;
Described aftertreatment comprises cooling, polishing, straightening, passivation and batches, described cooling comprises air-cooled and water-cooled, air-cooled referring to uses the freezing air containing 5 ~ 8% nitrogen directly to blow plate face, the temperature of zinc steel plate is made to be down to 100 ~ 200 DEG C, described water-cooled refers to and is immersed in completely in water by zinc steel plate, and the temperature of zinc steel plate is down to 50 ~ 60 DEG C.
2. the production technique of a kind of galvanizing steel plate according to claim 1, is characterized in that, described dry blowing refers to that the gas with pressure is 10 ~ 12MPa carries out purge 2 ~ 3 times to often opening surface of steel plate, and the time often all over purge is 5 ~ 10 minutes.
3. the production technique of a kind of galvanizing steel plate according to claim 1, it is characterized in that, described alkali lye refers to by sodium hydroxide powder, second alcohol and water by the formulated alkaline liquid of the mass ratio of 1:05:20, the manner of formulation of described alkali lye is, first by after second alcohol and water mixing and stirring, be heated to 40 ~ 60 DEG C, then pour sodium hydroxide powder into and stir, maintain the temperature at 30 ~ 50 DEG C of reaction 20 ~ 30min and form.
4. the production technique of a kind of galvanizing steel plate according to claim 1, it is characterized in that, described polishing refers to and first sprays zinc surface of steel plate with clear water, after rinsing with the surface of de-salted water to zinc steel plate again, put in hydraulic pressure four roller wet type polishing machine, setting polishing pressure is 1700 ~ 1900kN, and sprays the working roll in polishing machine with high pressure demineralized water in polishing process always, removes cadmia; Also with clear water, zinc steel plate surface is sprayed after polishing, remove and stick thing.
5. the production technique of a kind of galvanizing steel plate according to claim 1, it is characterized in that, described passivation refers to concentration the surface being applied to zinc steel plate of the three oxidation network dissolution homogeneity being 1.2%, then described zinc steel plate is placed on temperature is dry 10 ~ 15min under the environment of 40 ~ 60 DEG C at once, naturally 30 ~ 40min is placed again under normal temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510849203.2A CN105385815A (en) | 2015-11-26 | 2015-11-26 | Production process for hot-dip galvanized steel plate |
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| CN201510849203.2A CN105385815A (en) | 2015-11-26 | 2015-11-26 | Production process for hot-dip galvanized steel plate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435105A (en) * | 2016-12-01 | 2017-02-22 | 浙江东南金属薄板有限公司 | Preparation method of hot-dip-galvanizing steel coil |
| CN112024496A (en) * | 2020-07-09 | 2020-12-04 | 浙江协和陶瓷有限公司 | Electrolytic cleaning system and electrolytic cleaning method using same |
| CN112239841A (en) * | 2020-11-02 | 2021-01-19 | 马鞍山钢铁股份有限公司 | Control method for edge pocking mark defects of continuous hot-dip galvanized strip steel |
| US11313021B2 (en) * | 2017-05-26 | 2022-04-26 | Baoshan Iron & Steel Co., Ltd. | Hot dipped medium manganese steel and manufacturing method therefor |
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2015
- 2015-11-26 CN CN201510849203.2A patent/CN105385815A/en active Pending
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| CN1281056A (en) * | 1999-07-19 | 2001-01-24 | 左继营 | Electrically baking zinc technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435105A (en) * | 2016-12-01 | 2017-02-22 | 浙江东南金属薄板有限公司 | Preparation method of hot-dip-galvanizing steel coil |
| US11313021B2 (en) * | 2017-05-26 | 2022-04-26 | Baoshan Iron & Steel Co., Ltd. | Hot dipped medium manganese steel and manufacturing method therefor |
| CN112024496A (en) * | 2020-07-09 | 2020-12-04 | 浙江协和陶瓷有限公司 | Electrolytic cleaning system and electrolytic cleaning method using same |
| CN112239841A (en) * | 2020-11-02 | 2021-01-19 | 马鞍山钢铁股份有限公司 | Control method for edge pocking mark defects of continuous hot-dip galvanized strip steel |
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