CN105215053B - The production method of pickling electroplated product is exempted from hot rolling - Google Patents
The production method of pickling electroplated product is exempted from hot rolling Download PDFInfo
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- CN105215053B CN105215053B CN201410240710.1A CN201410240710A CN105215053B CN 105215053 B CN105215053 B CN 105215053B CN 201410240710 A CN201410240710 A CN 201410240710A CN 105215053 B CN105215053 B CN 105215053B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 63
- 238000005554 pickling Methods 0.000 title claims abstract description 57
- 238000005098 hot rolling Methods 0.000 title claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000000034 method Methods 0.000 claims abstract description 67
- 229910052742 iron Inorganic materials 0.000 claims abstract description 54
- 230000009467 reduction Effects 0.000 claims abstract description 49
- 230000008569 process Effects 0.000 claims abstract description 42
- 238000007747 plating Methods 0.000 claims abstract description 41
- 238000005097 cold rolling Methods 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000009713 electroplating Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 238000010079 rubber tapping Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000012805 post-processing Methods 0.000 claims abstract description 8
- 238000002161 passivation Methods 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000009500 colour coating Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000011135 tin Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 238000011536 re-plating Methods 0.000 claims description 2
- 238000000137 annealing Methods 0.000 abstract description 17
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 239000000758 substrate Substances 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 239000003595 mist Substances 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 4
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 4
- 239000011686 zinc sulphate Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
The present invention is the production method that pickling electroplated product is exempted from a kind of hot rolling, is comprised the following steps：Hot rolling, by reducing tapping temperature, finishing temperature and coiling temperature, mill speed and cooling velocity after rolling are improved to reduce iron scale thickness, to control scale structure；Or hot rolled plate is directly subjected to cold rolling with iron scale；Reduced anneal, hot-rolled substrate or the cold-reduced sheet with iron scale are directly entered reduction furnace without overpickling, made annealing treatment in 500 1000 DEG C of reduction furnace；Plating, steel plate are directly entered electroplating bath and electroplated after reduced anneal cools down；And plating post processing, electroplated product is washed, dried, be air-cooled, dab oil or passivation application processing are carried out afterwards, to obtain plating finished product.The present invention can omit pickling and the front and rear process related to pickling, simplify continuous annealing postprocessing working procedures and pre-electroplating treatment process, eliminate the processing of spent acid and the discharge of acid mist, reduce environmental pollution, and reduce production cost.
Description
Technical field
The present invention relates to a kind of production method of electroplated product, and in particular to be production that pickling electroplated product is exempted from hot rolling
Method.
Background technology
In recent years, the use of electroplated product has obtained alarming development, is widely used in household electrical appliance, steel furniture, does
Postulate the fields such as standby, automobile, construction material.
Electro-plating method flow is typically made up for the treatment of before plating, plating and plating posttreatment three parts.Fig. 1 a to Fig. 1 d are tradition
Electrolytic galvanized sheet production method route schematic diagram；Wherein Fig. 1 a are that display is in Hot Rolling Mill production process；Fig. 1 b are that display is in
Sour rolling mill production process, Fig. 1 c are to show in continuous annealing unit production process and Fig. 1 d it is that display is in electrogalvanizing machine
Group production process.As shown in 1a figures, hot rolled plate 1 cools down through the roughing of roughing mill 2, the finish rolling of finishing mill 3, cooling device 4, finally by
Coiling machine 5 is batched；In sour rolling mill as shown in 1b figures, successively through overpickling section 6, cold rolling section 7, oiling section 8, into continuous
Annealing unit Fig. 1 c, successively by degreasing, washing drying, reduced anneal, oiling, enter back into Electrolytic Galvanizing Line, such as Fig. 1 d institutes
Show, electroplated in Electrolytic Galvanizing Line after treatment before plating such as degreasing, washing into electrolytic cell, and plating posttreatment.Plating
Pre-treatment is to be related to the critical process of electroplated product quality good or not, and its main purpose is to remove grease, the oxidation of surface of steel plate
Thing (i.e. iron scale) and other pollutants.
At present, the conventional treatment before plating process before plating includes：Pickling, washing, drying, oiling, degreasing, reduced anneal
Deng.Wherein pickling is primarily to remove the iron scale of belt steel surface after hot-strip or hot rolled plate cold rolling, to avoid surface
It is binding force of cladding material to the adhesiveness of steel plate that the presence of oxide, which influences coating,.At present, pickling is usually to use hydrochloric or sulphur
The pickle of acid carries out pickling at 70-80 DEG C to strip, is made a return journey by chemolysis reaction except iron scale.Although pickling can have
Effect removes belt steel surface iron scale, but traditional chemical pickling still suffers from the following problem：First, pickling process dramatically increases
Production cost, requirement of the severe corrosive hot acid to production equipment is high, and Waste acid treatment device puts into larger, subsequent production
Operation and cost of equipment maintenance are higher, therefore significantly increase production and the operation cost of whole product；Secondly, pickling is using strong rotten
The hot hydrochloric acid or sulfuric acid of corrosion, acid mist caused by hot acid brings serious pollution problem to production environment under heating condition, therefore,
Pickling is always that cold rolling manufacturing enterprise pollutes a procedure the most serious；3rd, pickling process is also easy to produce deficient pickling and peracid
The defects of wash etc., when owing pickling, iron scale removal is not clean, influences galvanizing quality, overpickling easily increases surface of steel plate
Roughness, cause acid and the excessive consume of iron and the Hydrogen Brittleness Phenomena of high-strength product made from steel.Obviously traditional acid washing method substantially increases
The manufacturing cost of electroplated product, and there is also obvious deficiency in itself traditional plating production method：(1) continuous annealing and plating point
Do not produced in different units, the technological process of production is long, process is more, cycle length；(2) metal loss is more, lumber recovery is low, production efficiency
It is low, production cost is high；(3) whole production process high energy consumption, energy utilization rate are low, and waste discharge is more, and production environment pollution is tight
Weight, production process is not environmentally.
Therefore, pickling process is omitted, to simplify continuous annealing postprocessing working procedures and pre-electroplating treatment process, is moved back using direct-reduction
Then it is an important problem that fire carries out plating.And the research of current electroplated product and its production method generally concentrates on electricity
The improvement of plating process, method, equipment, plating reagent, coating surface quality etc., it is especially right to electro-plating pre-treatment method
The research for substituting acid washing method is seldom related to.
The content of the invention
The purpose of the present invention is the deficiency for traditional pickling and electro-plating method, there is provided pickling electroplated product is exempted from a kind of hot rolling
Production method, the new technology is applicable hot-rolled substrate and cold-reduced sheet simultaneously, can omit pickling and the front and rear process related to pickling,
Simplify continuous annealing postprocessing working procedures and pre-electroplating treatment process, eliminate the processing of spent acid and the discharge of acid mist, reduce environmental pollution, together
When controlled by hot rolling technology, to reduce iron scale thickness, realize the purpose quickly reduced.
The production method of pickling electroplated product is exempted from a kind of hot rolling of the present invention, comprises the following steps：
Hot rolling：In hot rolling production process, by reducing tapping temperature, finishing temperature and coiling temperature, rolling speed is improved
Spend with cooling velocity after rolling to reduce the iron scale thickness of hot rolled plate, and to control scale structure；
Reduced anneal：Hot rolled plate with iron scale is directly entered reduction furnace without pickling, gone back in reduction furnace
Original annealing；
Plating：After reduced anneal cools down, it is directly entered electroplating bath and is electroplated；
Plating post processing：Electroplated product is washed, dried, be air-cooled, carries out dab oil or passivation application processing afterwards,
Finished product is electroplated to obtain.
Between hot rolling and reduced anneal step, in addition to cold rolling：Hot rolled plate with iron scale is directly subjected to cold rolling,
To obtain the cold-reduced sheet with iron scale, to be directly entered reduction furnace reduction without pickling.
In hot-rolled process, tapping temperature is 1100-1250 DEG C, and finishing temperature is 800-900 DEG C, coiling temperature 550-
600 DEG C, mill speed 8-20m/s, cooling velocity is 7-30 DEG C/s.
Described tapping temperature is 1150-1200 DEG C, and finishing temperature is 840-870 DEG C, and coiling temperature is 550-570 DEG C,
Mill speed is 14-18m/s, and cooling velocity is 15-20 DEG C/s.
Described tapping temperature is 1170 DEG C or 1200 DEG C, and finishing temperature is 850 DEG C or 860 DEG C, and coiling temperature is 550 DEG C
Or 560 DEG C, mill speed is 17m/s or 18m/s, and cooling velocity is 20 DEG C/s or 18 DEG C/s.
In hot-rolled process, the average thickness of gained hot rolled plate scale on surface is 5-8 μm；Iron scale mainly forms
For FeO and Fe3O4, the two content adds and not less than 95%.
Cold rolling process can use straightening or smooth replaceable operation chain.
In reduced anneal process, reduction temperature is 500~1000 DEG C, residence time 60-300s, and reducibility gas is
H2Or the mixture of CO and inert gas, wherein H2Or CO concentration is not less than 4%.
Described reduction temperature is 750-950 DEG C, residence time 120-300s, H2Or CO concentration is 20%-75%.
Described reduction temperature be 800 DEG C, 850 DEG C or 900 DEG C, the residence time 180s, 240s or 300s, H2Or CO
Concentration is 25%, 50% or 75%.
In reduced anneal process, iron scale is reduced into metallic iron, reducing gas H2Or CO is oxidized to H2O or
CO2, have neither part nor lot in the H of reaction2Or CO is recycled after water removal into reduction protection gas system.
In the plating process, electroplated product can be any in zinc-plated, nickel, chromium, copper, iron, tin, bismuth, silver, aluminium, magnesium, cobalt
Kind or its alloy.
In handling after plating, electroplated product uses directly as finished product.
In handling after plating, electroplated product as prime coat to cover various surface defects caused by preceding process, herein
On the basis of carry out follow-up re-plating, color coating, hot dip, apply membrane operations.
It is to exempt from pickling direct-reduction annealing plating production method that pickling electroplated product production method is exempted from the hot rolling of the present invention, should
Method is implemented by two kinds of paths：First, optimization hot-rolling method reduces hot rolled plate thickness of scale on surface, iron scale is controlled
Structure, hot rolled plate is set to be directly entered reduction furnace without pickling, iron scale is quickly reduced into metallic iron in reduction furnace, cooling
After electroplated；Second, by after above-mentioned hot rolled strip iron scale cold rolling, cold rolling is directly carried out without pickling, is entered back into after cold rolling
Reduction furnace reduces the small amounts thing for removing remained on surface, is electroplated after cooling.This method is applicable hot rolled plate and cold rolling simultaneously
Plate, compared to traditional electroplated product production method, pickling and the front and rear process i.e. oiling related to pickling, cleaning, drying can be omitted
Deng, simplify continuous annealing postprocessing working procedures and pre-electroplating treatment process, and do not newly increase any process, simply strengthen in former method
Reduced anneal process, optimize reduced anneal technological parameter, such as reduced anneal temperature, time, annealing atmosphere concentration；The present invention
The production method of pickling electroplated product is exempted from hot rolling, avoids the use of the Korrosionsmedium such as sulfuric acid and hydrochloric acid using big calorimetric, because
This eliminates the processing of spent acid and the discharge of acid mist, fundamentally solves the problem of environmental pollution that pickling is brought, while reduce multiplexing
The energy consumption and waste discharge that sequence is brought, and then reduce production cost.
Brief description of the drawings
Fig. 1 a to Fig. 1 d are traditional electrolytic galvanized sheet production method route schematic diagrames, and wherein Fig. 1 a are that display is in Hot Rolling Mill
Production process；Fig. 1 b are that display rolls production process in acid；Fig. 1 c are that display is in continuous annealing production process and Fig. 1 d
Display is in Electrolytic Galvanizing Line production process.
Fig. 2 is that pickling electrolytic galvanized sheet production method route schematic diagram is exempted from the hot rolling of one embodiment of the invention.
Fig. 3 is that the surface microscopic of galvanized sheet obtained by pickling electrolytic galvanized sheet production method is exempted from the hot rolling of one embodiment of the invention
Figure.
Fig. 4 be the hot rolling of one embodiment of the invention exempt from galvanized sheet obtained by pickling electrolytic galvanized sheet production method section it is microcosmic
Structure.
Embodiment
For the above objects, features and advantages of the present invention can be become apparent, the tool below in conjunction with accompanying drawing to the present invention
Body embodiment elaborates.Firstly the need of explanation, the present invention is not limited to following embodiments, this area
The spirit that technical staff should be embodied from following embodiments understands the present invention, and each technical term can be based on the present invention's
Spirit Essence makees broadest understanding.Identical reference represents identical part in the accompanying drawings.
The present invention exempts from pickling direct-reduction annealing plating production method and implemented by two kinds of paths：First, optimization hot-rolling method
Hot rolled plate thickness of scale on surface is reduced, scale structure is controlled, hot rolled plate is directly entered reduction furnace, oxygen without pickling
Change iron sheet and metallic iron is quickly reduced into reduction furnace, electroplated after cooling；Second, hot rolled plate is directly carried out without pickling
Cold rolling, the iron scale that reduction furnace removes remained on surface is entered back into after cold rolling, is electroplated after cooling.Therefore the new method is simultaneously
Hot rolled plate and cold-reduced sheet are applicable, pickling and the front and rear process related to pickling can be omitted, simplify continuous annealing postprocessing working procedures and plating
Pretreatment procedure, omit the processing of spent acid, eliminate the discharge of acid mist, reduce environmental pollution, while reduce the energy that multiple operation is brought
Consumption and waste discharge, and then reduce production cost.
As shown in Fig. 2 the production method of pickling electroplated product is exempted from the hot rolling of one embodiment of the invention, mainly include as follows
Step：
(1) hot rolling：When raw material is hot-rolled substrate 1, by reducing the tapping temperature in roughing mill 2, reducing in finish rolling
Final rolling temperature (particularly finishing temperature) in machine 3 and the coiling temperature in coiling machine 5, improve mill speed and in cooling device
Cooling velocity after rolling in 4 reduces iron scale thickness, controls iron scale Rotating fields.
(2) cold rolling：Hot-rolled substrate can be directly entered reduced anneal process (3), can also be carried out with iron scale cold
Roll, when hot rolled plate is directly entered reduced anneal process, this cold rolling process is not present.
(3) reduced anneal：Hot rolled plate or cold-reduced sheet are directly entered reduction furnace without overpickling, the steel band with iron scale according to
It is secondary to pass through kink 6, bringing-up section 7, soaking zone 8, cooling section 9, made annealing treatment in 500-1000 DEG C of reduction furnace.
(4) electroplate：Steel plate is directly entered electroplating bath 10 and carries out plating and realize continuous annealing process after reduced anneal cools down
With combining for electroplating work procedure, production equipment and auxiliary production process are significantly simplified.
(5) electroplated product washed, dried, be air-cooled, carrying out dab oil or passivation application processing afterwards, you can obtain electric
Plate finished product.
By repeatedly sample and calculating repeatedly, by the controlling hot rolling parameter in step (1) hot-rolled process of the present invention
Optimal control is as follows：Tapping temperature control is 1100-1250 DEG C, and finishing temperature control is 800-900 DEG C, and mill speed control is
8-20m/s, cooling velocity after rolling control are 7-30 DEG C/s, and hot-rolling coiling temperature control is 550-600 DEG C.It is preferably, described
Tapping temperature is 1150-1200 DEG C, and finishing temperature is 840-870 DEG C, and coiling temperature is 550-570 DEG C, mill speed 14-
18m/s, cooling velocity are 15-20 DEG C/s.More preferably, described tapping temperature is 1170 DEG C or 1200 DEG C, finishing temperature 850
DEG C or 860 DEG C, coiling temperature be 550 DEG C or 560 DEG C, mill speed is 17m/s or 18m/s, and cooling velocity is 20 DEG C/s or 18
℃/s.In this way, the hot rolled plate thickness of scale on surface obtained, than relatively thin (being generally less than 10 μm), average thickness is 5-8 μm of (heat
Plate surface iron scale average thickness is rolled to refer in hot rolled plate representative locations such as head, middle part, afterbody and edge etc., each position
Take at 1 points, and by the summation of each point institute oxygen determination thickness of scale divided by the total number of measurement point, acquired results are it
Average thickness.), iron scale is mainly formed as FeO and Fe3O4, the two content adds and not less than 95%, the knot of the iron scale
Structure has preferable adhesiving effect.
Cold rolling process in step (2) of the present invention can change product thickness specification, roll thin and broken hot-rolled strip
Steel surface iron scale, beneficial to sequential reduction, cold rolling process can use straightening or smooth replacement, compared with cold rolling, straightening or flat
The whole integrality that can crush iron scale, beneficial to sequential reduction, reduction is more thorough, and oxide-free in reduced iron can be achieved
Grain, but change the scope relative decrease of product thickness specification.
Reduction temperature is 500~1000 DEG C, residence time 60s-300s in step (3) of the present invention, reproducibility
Gas is H2Or the mixture of CO and inert gas, wherein H2Or CO concentration is not less than 4%, it is preferable that described reduction temperature
For 750-950 DEG C, residence time 120-300s, H2Or CO concentration is 20%-75%.More preferably, described reduction temperature
For 800 DEG C, 850 DEG C or 900 DEG C, the residence time 180s, 240s or 300s, H2Or CO concentration is 25%, 50% or 75%.
Iron scale is reduced into metallic iron in step (3) of the present invention, improve recovery rate of iron and product into
Material rate, while reducing gas H2Or CO is oxidized to H2O or CO2, secondary pollution will not be caused to environment, have neither part nor lot in the H of reaction2
Or it can enter reduction protection gas system after CO water removals and recycle.
Electroplated product can be zinc-plated, nickel, chromium, copper, iron, tin, bismuth, silver, aluminium, magnesium, cobalt in step (4) of the present invention
Any of or its alloy, it is preferable that be zinc-plated, flash zinc and nickel and its alloy.
Electroplated product can use directly as finished product in step (5) of the present invention, coating also can be used as prime coat with
Various surface defects caused by process before covering, subsequently electroplated again on this basis, color coating, hot dip, the operation such as film.
The production method of pickling electroplated product is exempted from hot rolling of the present invention, compared to traditional electroplated product production method, saves
The multiple working procedures such as pickling, oiling, cleaning, drying and pre-electroplating treatment have been omited, and have not newly increased any process, have simply been strengthened
Reduced anneal process in former method, by optimizing reduced anneal technological parameter, such as reduced anneal temperature, time, annealing atmosphere
Concentration etc..
Pickling electroplated product production method is exempted from hot rolling of the present invention, compared to traditional electroplated product production method, is not required to
Pickling and its concerned process steps and pre-electroplating treatment process are wanted, enormously simplify production procedure, improve production efficiency, are reduced each
The consumption of kind energy medium and waste discharge, have saved production cost；Simultaneously should be as the scale on surface quilt of waste
Utilized again after being reduced into metal, improve recovery rate of iron and product lumber recovery.
The production method of pickling electroplated product is exempted from hot rolling of the present invention, avoids the Korrosionsmedium such as sulfuric acid of big calorimetric
With the use of hydrochloric acid, fundamentally solves the problem of environmental pollution that pickling is brought.
The such scheme of the present invention is further illustrated below in conjunction with concrete application embodiment, to become apparent from understanding the present invention
Purpose, feature and beneficial effect.
Embodiment 1
As shown in Fig. 2 the slab 1 after dephosphorization is subjected to hot rolling, wherein, tapping temperature is 1100 DEG C, finishing temperature 870
DEG C, coiling temperature is 600 DEG C, mill speed 18m/s, 15 DEG C/s of cooling velocity after rolling, hot rolled plate iron scale average thickness
For 8 μm.Hot rolled plate is directly entered reduction furnace, 1000 DEG C, time 60s of reduction temperature, and reducing gas medium is H2, H2Concentration 25%
(Vol%) after, being cooled down under protective atmosphere, electrogalvanizing is carried out into electroplating bath, plating solution composition is ZnSO4(400g/L)、H2SO4
(15g/L), solution temperature are 50 DEG C, pH value 1, current density 100A/dm2, time 2min.
The surface topography of gained galvanized sheet is as shown in figure 3, coating is uniform, without obvious plating leakage.Its section microstructure such as Fig. 4
Shown, thickness of coating is average reduction iron layer between 5-6 μm, coating and substrate to be present than more uniform, and only residual is a small amount of in reduced iron
The oxide particle not being reduced, reduction effect are good.
Embodiment 2
Slab after dephosphorization is subjected to hot rolling, wherein, tapping temperature is 1150 DEG C, and finishing temperature is 850 DEG C, coiling temperature
For 550 DEG C, mill speed 12m/s, 28 DEG C/s of cooling velocity after rolling, the average thickness of hot rolled plate iron scale is 5 μm.Hot rolling
After plate uncoiling, reduction furnace, 500 DEG C, time 300s of reduction temperature are directly entered, reducing gas medium is N2, N2Concentration 75%
(Vol%) after, being cooled down under protective atmosphere, flash nickel is carried out, plating solution composition is NiSO4(400g/L)、H2SO4It is (15g/L), molten
Liquid temperature degree is 50 DEG C, pH value 1, current density 125A/dm2, time 0.15s, enter back into electroplating bath and carry out electrogalvanizing,
ZnSO4(400g/L)、H2SO4(15g/L), solution temperature are 50 DEG C, pH value 1, current density 80A/dm2, the time is
3min, plating posttreatment are finally batched.
Embodiment 3
2.1mm hot rolled plates are subjected to band iron scale and are cold-rolled to 1.8mm thickness, are directly entered reduction furnace, reduction temperature 800
DEG C, time 120s, reducing gas medium is H2, H2Concentration 20% (Vol%), after being cooled down under protective atmosphere, enter into electroplating bath
Row electrogalvanizing, plating solution composition is ZnSO4(400g/L)、H2SO4(15g/L), solution temperature are 50 DEG C, pH value 1, current density
For 120A/dm2, time 2.5min.
Embodiment 4
When supplied materials is 1.0mm thickness cold-reduced sheets (after hot rolling and cold rolling), direct uncoiling enters reduction furnace, reduction temperature
720 DEG C, time 60s, reducing gas medium is N2, N2Concentration 10% (Vol%), after being cooled down under protective atmosphere, carry out flash
Nickel, plating solution composition is nickel sulfate (110g/L), sodium chloride (5g/L), boric acid (0.6g/L), magnesium sulfate (10g/L), BBZ (0.1g/
L), solution temperature is room temperature, pH value 2, cathode-current density 110A/dm2, time 0.5s, carry out again on this basis
Electrogalvanizing, plating solution composition is ZnSO4(400g/L)、H2SO4(15g/L), solution temperature are 50 DEG C, pH value 1, and current density is
100A/dm2, time 2min, plating posttreatment finally batches.
Embodiment 5
Slab after dephosphorization is subjected to hot rolling, wherein, tapping temperature is 1200 DEG C, and finishing temperature is 880 DEG C, coiling temperature
For 570 DEG C, mill speed 12m/s, 20 DEG C/s of cooling velocity after rolling, hot rolled plate iron scale average thickness is 5 μm.Hot rolled plate
After uncoiling, reduction furnace, 800 DEG C, time 180s of reduction temperature are directly entered, reducing gas medium is H2, H2Concentration 75%
(Vol%) after, being cooled down under protective atmosphere, flash nickel is carried out, plating solution composition is NiSO4(400g/L)、H2SO4It is (15g/L), molten
Liquid temperature degree is 50 DEG C, pH value 1, current density 125A/dm2, time 0.15s, batch finished product.
Embodiment 6
Slab after dephosphorization is subjected to hot rolling, wherein, tapping temperature is 1180 DEG C, and finishing temperature is 860 DEG C, coiling temperature
For 590 DEG C, mill speed 14m/s, 17 DEG C/s of cooling velocity after rolling, hot rolled plate iron scale average thickness is 6 μm.Hot rolled plate
After uncoiling, reduction furnace, 850 DEG C, time 180s of reduction temperature are directly entered, reducing gas medium is N2, N2Concentration 25%
(Vol%) after, being cooled down under protective atmosphere, flash nickel is carried out, plating solution composition is NiSO4(400g/L)、H2SO4It is (15g/L), molten
Liquid temperature degree is 50 DEG C, pH value 1, current density 125A/dm2, time 0.15s, color coating is carried out, then batches use.
Through measuring, electroplated product obtained by embodiment 2-6 also has coating uniform similarly to Example 1, without obvious plating leakage, plating
There is reduction iron layer than more uniform, between coating and substrate in thickness degree, in reduced iron or a small amount of oxide not being reduced of residual
The features such as grain (oxide-free particle in the reduced iron after cold rolling reduction), target of the present invention can be realized, meets many clients
Demand.
It should be understood that after the above-mentioned instruction content of the present invention has been read, those skilled in the art can make to the present invention
Various changes or modification, these equivalent form of values equally fall within the application appended claims limited range.
Claims (7)
1. the production method of pickling electroplated product is exempted from a kind of hot rolling, it is characterised in that comprises the following steps：
Hot rolling：In hot rolling production process, by reducing tapping temperature, finishing temperature and coiling temperature, improve mill speed and
Cooling velocity after rolling reduces the iron scale thickness of hot rolled plate, and to control scale structure；In hot-rolled process, come out of the stove
Temperature is 1100-1250 DEG C, and finishing temperature is 800-900 DEG C, and coiling temperature is 550-600 DEG C, mill speed 8-20m/s,
Cooling velocity is 7-30 DEG C/s；
Cold rolling：Hot rolled plate with iron scale is directly subjected to cold rolling, to obtain the cold-reduced sheet with iron scale, to without acid
Wash and be directly entered reduction furnace reduction；
Reduced anneal：Cold-reduced sheet with iron scale is directly entered reduction furnace without pickling, reduction is carried out in reduction furnace and is moved back
Fire processing；In reduced anneal process, iron scale is reduced into metallic iron, reducing gas H2Or CO is oxidized to H2O or CO2,
Have neither part nor lot in the H of reaction2Or CO is recycled after water removal into reduction protection gas system；In reduced anneal process,
Described reduction temperature is 750-950 DEG C, residence time 120-300s, H2Or CO concentration is 20%-75%；
Plating：After reduced anneal cools down, it is directly entered electroplating bath and is electroplated；
Plating post processing：Electroplated product is washed, dried, be air-cooled, dab oil or passivation application processing are carried out afterwards, to obtain
Finished product must be electroplated.
2. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：In hot-rolled process
In, the average thickness of gained hot rolled plate scale on surface is 5-8 μm；Iron scale is mainly formed as FeO and Fe3O4, the two contains
Amount adds and not less than 95%.
3. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：Cold rolling process uses
Straightening or smooth replaceable operation chain.
4. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：Described reduction temperature
Spend for 800 DEG C, 850 DEG C or 900 DEG C, the residence time 180s, 240s or 300s, H2Or CO concentration be 25%, 50% or
75%.
5. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：In electroplating work procedure
In, electroplated product can be any of zinc-plated, nickel, chromium, copper, iron, tin, bismuth, silver, aluminium, magnesium, cobalt or its alloy.
6. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：Handle after plating
In, electroplated product uses directly as finished product.
7. the production method of pickling electroplated product is exempted from hot rolling according to claim 1, it is characterised in that：Handle after plating
In, electroplated product as prime coat with various surface defects caused by process before covering, carry out on this basis follow-up re-plating,
Color coating, hot dip, apply membrane operations.
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| CN111069306A (en) * | 2019-11-26 | 2020-04-28 | 本钢板材股份有限公司 | Production method for controlling spot defects on surface of electrogalvanized IF steel product |
| CN111390570B (en) * | 2020-03-31 | 2021-07-06 | 日照宝华新材料有限公司 | Method for mutual conversion between acid pickling coil and hot rolling leveling on acid leveling line |
| CN111519221A (en) * | 2020-04-15 | 2020-08-11 | 本钢板材股份有限公司 | Processing method of single-sided electro-galvanizing |
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| CN103537640B (en) * | 2013-10-18 | 2015-07-29 | 东北大学 | A kind of thin strap continuous casting exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling |
| CN103726003B (en) * | 2013-12-20 | 2015-10-28 | 东北大学 | Pickling hot galvanizing method exempted from by a kind of hot rolled strip based on scale reduction |
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