CN1530458A - Oxidation controlling method before continuous steel strip electroplating and electroplating operating line - Google Patents

Oxidation controlling method before continuous steel strip electroplating and electroplating operating line Download PDF

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Publication number
CN1530458A
CN1530458A CNA2004100284264A CN200410028426A CN1530458A CN 1530458 A CN1530458 A CN 1530458A CN A2004100284264 A CNA2004100284264 A CN A2004100284264A CN 200410028426 A CN200410028426 A CN 200410028426A CN 1530458 A CN1530458 A CN 1530458A
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China
Prior art keywords
steel band
stove
plating
heating unit
temperature
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Granted
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CNA2004100284264A
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CN100554489C (en
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弗朗索瓦·米尼亚尔
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Fives Stein SA
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Stein Heurtey SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0042—Cleaning arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

In the continuous hot dip galvanising of steel strip (1), containing some oxidizible addition elements in a proportion to improve the mechanical properties of the steel, the strip traverses through a galvanising furnace (3) under a reducing atmosphere. The furnace is made up of sections for the heat treatment, heating, soaking, cooling and dipping in a galvanising bath (2). The strip is subjected, upstream of the entry section of the furnace, to an oxidation treatment in conditions of temperature, duration and oxygen content of a gas in which the strip is steeped, such that the oxidizible addition elements may be oxidised essentially within the strip before it has had the chance to migrate towards the surface for it to form an oxide layer.

Description

Oxidation control method and electroplating activity line before the steel band continuous electroplating
Technical field
The present invention relates to the continuous immersion hot-galvanizing method of steel band, described steel band comprises a certain proportion of oxidable interpolation element that is used to improve the steel mechanical characteristics.
Background technology
The mechanical characteristics of improving steel also is to improve physical strength, and for example purpose is to reduce the thickness of steel, therefore reduces the weight of steel, and improves stampability or improve this two indexs.This causes setting up the heterogeneous steel of various models (nuances), for example DP type (two-phase) and TRIP type (transformation that plasticity causes).
The very high heterogeneous model of these intensity generally element by having added sclerization such as Si, Mn, Cr, Mo etc. obtains.
The hot dipping that meets present state of the art is gone into to electroplate stove and is generally comprised several parts that are used to realize different heat treatment stages, and these heat treatment stages are generally: heating, keep, cooling.Heat treatment furnace is regulated with a kind of neutrality or reducing gas, and this gas generally is made of a kind of mixture of nitrogen and hydrogen, is used for reducing before plating the ferric oxide that plate surface exists.
Have been found that for heterogeneous steel the Sauerstoffatom that exists in the element of the easier oxidation of ratio iron of existence such as Si, Mn, Cr, Mo isopreference and the stove combines, and forms oxide compound on the surface of steel band.The oxidation potential that these compositions are very high even can drive the surface transport of their atom to steel band, make they can with the oxygen oxidation that exists in the stove.
Consequently form a thin oxide layer in steel strip surface.These oxide compounds are stable, and can not reduce during their different pieces by stove, when therefore being immersed in steel band in the zinc groove, can find these oxide compounds on the surface of steel band, and this can become the obstacle that adheres to of zinc during electroplating.With the limit of prior art state compatible in reduce stove gas dew point can not eliminate this phenomenon, so people always find the defective that exists these local oxide compounds that exist to produce on the surface of electroplating band.
Therefore, present steel band immersion plating method can not correctly make contain the oxidation element that is enough to improve the steel mechanical characteristics such as Si, Mn, heterogeneous steel such as Cr, Mo are electroplated.
Summary of the invention
The apparatus and method that the purpose of this invention is to provide a kind of continuous immersion hot-galvanizing, this apparatus and method can correctly be handled the steel band that contains oxidable interpolation element, and the content of these elements is enough to improve the mechanical characteristics of steel.
The present invention relates to a kind of steel band Continuous Heat immersion plating service line, steel band comprises a certain proportion of oxidable interpolation element that can improve the steel mechanical characteristics, steel band is advanced in a plating stove that is under the reducing gas along this lines, this service line is characterised in that, service line comprises a device that steel band is heated to a proper temperature in the upstream of electroplating stove, be a zone that steel band is exposed to a kind of oxidizing gas subsequently, the oxygen level of oxidizing gas is, consider the temperature of steel band and the time of processing, the oxidizable element that steel band is added can be to affiliated surface transport and just oxidation on the surface under the steel strip surface before this of surface formation can produce the oxide skin of electroplating defective at them.The ferric oxide that produces in this operating process will be reduced in the process of steel band by stove.
In addition, in order to carry out oxide treatment, steel band is heated between 150 ℃ to 400 ℃, is preferably between 150 ℃ to 300 ℃.For steel and a kind of given oxidizing gas of certain model, by selecting temperature and the residence time oxidation of controlling steel strip surface of steel band in oxidizing gas.
The control of the temperature and the residence time will be carried out continuously, and will consider the momentary velocity that the running status of service line, particularly steel band are advanced.The control of steel band oxide treatment can be carried out (to the effect of temperature of steel strips) by the heating power that adjusting is positioned at the stove upstream, perhaps carries out (to the effect of oxidization time) by acting on the heating unit that is in the stove upstream and the distance between the stove inlet.
The oxidizing gas that carries out the controlled oxidation operation of steel strip surface therein can be the air of surrounding environment or be enclosed in other gas in the shroud that is installed in the stove upstream, the oxygen level in people's controlled oxidation gas.
Description of drawings
The present invention also comprises other device of some amount except device recited above, below these devices will be discussed especially in the non-limiting examples that the reference accompanying drawing is described in detail.
Fig. 1 is a synoptic diagram of implementing the Continuous Heat immersion plating service line of the inventive method;
Fig. 2 be the temperature of a point of an expression steel band along with the figure of this change in location on service line, ordinate zou is a temperature, X-coordinate is this position on service line;
Fig. 3 is the synoptic diagram of an electroplating activity line modification;
Fig. 4-the 6th, other implements modification;
Embodiment
For Fig. 1-4, steel band moves from left to right.
With reference to Fig. 1 can schematically see one a steel band be immersed in one the fusing zinc plating tank in Continuous Heat electroplating activity line.
Service line comprises a plating stove 3 of making according to prior art, is used for before steel band 1 is immersed in zinc groove 2 steel band 1 being handled.Stove comprises several parts that are used for realizing in succession heat treated different steps, and these stages are generally heating, maintenance, are cooled to a temperature that is suitable at the surface deposition zinc of steel band then.The gas of stove 3 is by the mix reducing gas realized of common nitrogen with oxygen, and keeps the end dew point of gas as far as possible.
Steel band 1 contains some oxidable interpolation elements such as Si, Mn, Cr, Mo, and their ratio is enough to improve the mechanical characteristics of steel band.Up to the present, such electroplating activity line can not make a kind of steel that contain the oxidation element of this ratio correctly carry out the Continuous Heat immersion plating, because just as explained, when carrying out the thermal treatment of heat and maintenance, form the oxide skin of these extremely thin elements on the surface, and this thin oxide layer remains in the zinc of thawing always, and this can cause defective in coating.
According to the present invention, make steel band 1 in a zone 8 of stove 3 upstreams, stand oxide treatment, gas, temperature and the residence time condition of handling makes oxidable interpolation element, particularly Si, Mn, Cr, Mo can be to the steel strip surface migration with oxidized below steel strip surface before forming a zone of oxidation even producing the plating defective at them.
Under these conditions, when handling in chamber 3, the oxide compound that adds element, is therefore no longer included and adds element to the migration of steel strip surface and add thick oxide layer in material by trap, electroplates defective up to producing.
When handling in zone 8 with in the zone 6 of the inlet of stove, ferric oxide forms on the surface of steel band.These ferric oxide are reduced in the inner chamber of stove 3, make steel band 1 have one to have the surface that the oxide skin that adds element is reduced when arriving fusing zinc groove 2, and a good plating can be arranged like this.
Zone 8 comprises that one is heated to temperature required heating unit to steel band 1, and this temperature is generally between 150 ℃ to 400 ℃.Be provided with a control device 7 that constitutes by computer or treater, be used for heating, as velocity sensor 4, temperature sensor 5 and the steel strip surface radiation sensor 6 of steel band by the sensor adjustment steel band.
Control in the time that the outlet temperature and the steel band 1 of heating unit 8 outlets stays between the inlet of zone 8 and zone 8 and stove 3 produces the kinetic control of oxidation according to given oxidizing gas, steel band 1.Combination to these parameters is optimized according to the thickness of the speed of the character of steel to be processed, service line and steel band and width.
Heating unit 8 makes it have less thermal lag and stronger reactivity through selecting, so that the oxidation control that keeps steel strip surface during the interim phase that the change of shape of the velocity variations of service line or steel band 1 causes.Heating unit 8 can be made of the gas furnace or the non-direct heating device of a naked light type, and heating unit preferably is made of an electromagnetic induction furnace.Induction furnace comprises at least one ruhmkorff coil, ruhmkorff coil can near or away from electroplating stove, so that coordinate to produce the kinetics of heat.
The oxide treatment of steel band 1 between the inlet of zone 8 and zone 8 and stove 3 is preferably in the air carries out.Then the oxidation of steel band control realizes by two parameters of control, i.e. steel band time of staying in the temperature of zone 8 outlets and the steel band air between the outlet of the inlet in zone 8 and stove 3.When the speed of service line increased, temperature should increase, with the minimizing of residence time in high temperature air of compensation steel band.
Fig. 2 represents the temperature of a point of steel band 1 with the variation of this position on service line, and ordinate zou is represented the temperature of this point, and X-coordinate is represented this position on service line.In the upstream of heating unit 8, the temperature of steel band is low, for example is lower than 100 ℃, is equivalent to line segment 9.When steel band 1 passed through in heating unit 8, its temperature increased, and for example increased along inclined line segment 10.From the inlet that exports to stove 3 of heating unit 8, it is constant that the temperature of steel band 1 keeps substantially, such as line segment 11 sign, oxide treatment continued to carry out in this stage.In the inner chamber of stove 3, the heating of steel band 1 was proceeded according to a metallurgical cycle that is suitable for it, and this stage is represented with 12.
The oxidation control of steel band can be undertaken by acting on one or several parameter shown in Figure 2.Can act on the temperature of steel band by the average gradient that changes line segment 10, so that obtain the height that can change of line segment 11 platforms.The oxidation efficiency of steel band for example changes steel band is exposed to oxidizing gas wherein during this processing platform oxygen concn during also can changing the time length of platform 11 or improving platform 11.
A modification of Fig. 3 presentation graphs 1, wherein zone 8 is connected with the inlet of stove 3 by the mode of shroud 13 with sealing.Know, can control the oxygen concn in the shroud 13, make the oxidation of steel band adapt to the parameter of the oxidation kinetics needs of the speed of specific type, steel band of steel and other control steel band.The stopping property of the inner chamber of the control of the oxygen level of shroud 13 and this shroud and the external world or stove 3 realizes according to existing technological method.
The control that concerns between the time length of oxide treatment and the operating parameter of service line can be undertaken by changing the length of steel band 1 between the inlet of the outlet of heating unit 8 and stove 3.This length variations can be undertaken by the whole bag of tricks.
First kind may be the direction mobile heating device 8 along steel band 1, shown in the dotted arrow 14 of Fig. 4.For a given steel band speed, when heating unit 8 during near stove 3, the treatment time shortens, and when heating unit 8 during away from stove 3, treatment time increase.
Second kind of possibility is shown in Fig. 5.Heating unit 8 is fixed.Steel band 1 can be at parallel mobile travelling block 16 with the direction of steel band with one through a fixed pulley 15 between heating unit 8 and stove 3, and is as shown in arrow 17.When travelling block 16 moved right, the distance of steel band between heating unit 8 and stove 3 increased, and so just increased oxidation treatment time.On the contrary, when travelling block 16 when move on the left side of Fig. 5, the length of steel band shortens, and has so just reduced the treatment time.This device that has a travelling block and two level band sections can repeat repeatedly with several pulleys band section different with several length, so that increase the length of steel band between heating unit 8 and stove 3, and increases the possibility of this length variations.
A modification of Fig. 6 presentation graphs 5, to this modification, heating unit 8 is fixed, steel band 1 through two fixed pulleys 20 and 21 and one can with the travelling block 19 of the main direction vertical shifting of steel band, as shown in arrow 18.When travelling block 19 moved up, the steel band length between heating unit 8 and the stove 3 increased, and had so just increased the time of oxide treatment.On the contrary, when travelling block 19 when the below of Fig. 6 is mobile, the length of steel band reduces, and has so just reduced the time of handling.This device that has a pulley 19 and two belt sections can repeat repeatedly, so that increase the steel band length between heating unit 8 and the stove 3, and increases the possibility of this length variations.
Know that the various combinations of fixed pulley and travelling block can change the steel band length between heating unit 8 and the stove 3, so just can change the oxidization time of steel band, therefore also can use these combinations within the scope of the invention.
Can also the pulley 15 of Fig. 5 and 17 and Fig. 6 in pulley 19,20,21 be placed in a shroud such as the shroud 13, can and be adjusted to the processing that will obtain the control of wherein oxygen concn.
Also know, can steel band be combined with oxidization time control in the temperature out control of heating unit 8 according to the feature of material and the target of being considered.The control of the control in temperature and treatment time and corresponding action device is carried out as 4,5,6 measurements that realize according to the product data of operator's grasp and by transmitter by computer 7.
Owing to used these devices, steel band 1 arrives fusing zinc groove 2, and the oxide compound that its surface forms is restricted, and the oxide compound comprising adding element makes zinc better attached on this surface.
Electroplating activity line of the present invention constitutes one can give the galvanized means of production flexibly of various steel economically, and regardless of their character of additive, their surface does not all have the deposition defective of zinc.Because their fast adaptability, control device 7 and heating unit 8 can adapt to the oxidation control method of the various variations of various product sizes and line speed.
Also it is to be noted, enforcement comprises that the necessary device of oxidation control method of the steel band of additive such as Si, Mn, Cr, Mo etc. can be added in the existing equipment at an easy rate, so that enlarge its production range, perhaps be added to one on the installed device, these devices can be cancelled at an easy rate, so that produce the Steel Type that does not comprise these additives.

Claims (12)

1. the Continuous Heat immersion plating method of steel band (1), described steel band (1) comprises a certain proportion of oxidable interpolation element that can improve the steel mechanical characteristics, according to this method, described steel band is under the reducing gas in a plating stove (3) advances, described plating stove is by heat treatment section, hot spots, retaining part, cooling segment and the immersion plating in a plating tank (2) partly constitute, described steel band is in temperature, process oxide treatment under the condition of the oxygen level of time length and a gas---described steel band is bathed and steeped in described gas---, thereby, described oxidable interpolation element can be to surface transport so that before forming the zone of oxidation of a generation plating defective at them on the surface, main oxidized in the inside of described steel band
The method is characterized in that: described steel band is in the upstream of described stove inlet part process oxide treatment; Described steel band Mu Pao is an air with the gas that carries out oxide treatment wherein; In order to carry out oxide treatment, described steel band is heated to temperature between about 150 ℃ to 400 ℃; And, to be undertaken by jointly controlling temperature/time in described steel strip surface and the control of the oxidation below the abuts on surface, the temperature of described steel band (1) increases when making the speed increase of service line, and the treatment time minimizing, and vice versa.
2. the method for claim 1 is characterized in that, in order to carry out oxide treatment, described steel band is heated to temperature between about 150 ℃ to 300 ℃.
3. method as claimed in claim 1 or 2 is characterized in that, temperature control is undertaken by the power at the heating unit (8) of the described steel band of described plating stove upstream.
4. as each described method in the claim 1 to 3, it is characterized in that steel band (1) length that the control of oxidation treatment time is positioned at by change between the inlet of the outlet of a heating unit (8) of described stove upstream and described plating stove (3) is carried out.
5. method as claimed in claim 4 is characterized in that, the steel band length that changes between the inlet of the outlet of described heating unit (8) and described plating stove (3) is to guarantee by moving described heating unit (8) along described steel band direction.
6. method as claimed in claim 5, it is characterized in that, the length that changes steel band length between the inlet of the outlet of described heating unit (8) and described plating stove (3) and be at least one the horizontal or vertical band section by regulating described steel band guarantees, or by the two in conjunction with guaranteeing.
7. the Continuous Heat immersion plating service line of steel band (1), described steel band (1) comprises a certain proportion of oxidable interpolation element that can improve the mechanical characteristics of steel, according to this service line, described steel band is electroplated to be under the reducing gas in the stove (3) one and is advanced, and immersion plating in a plating tank, it is characterized in that, described service line comprises a heating unit (8) that described steel band is heated to the temperature between about 150 ℃ to 400 ℃ in the upstream of described plating stove, with one described steel band is exposed to a kind of zone of oxidizing gas, the oxygen level of described oxidizing gas make---considering temperature and treatment time---described steel band oxidable interpolation element they can move to the surface and before the surface forms a zone of oxidation in described steel band internal oxidation.
8. electroplating activity line as claimed in claim 9 is characterized in that, described heating unit (8) is made of an induction furnace, and described induction furnace also forms described steel band is exposed to zone in the oxidizing gas.
9. as claim 7 or 8 described electroplating activity lines, it is characterized in that, described heating region (8) is connected with the inlet of described stove (3) by the mode of a shroud (13) with sealing, and oxygen concn can be controlled and regulate by the processing that will realize in described shroud (13).
10. electroplating activity line as claimed in claim 8 is characterized in that described induction furnace comprises at least one ruhmkorff coil, described ruhmkorff coil can near or away from described plating stove, so that regulate the heating process.
11. electroplating activity line as claimed in claim 7 is characterized in that described heating unit is made of a gas furnace.
12. as each described electroplating activity line in the claim 7 to 11, it is characterized in that, described service line comprises that one is fit to act on the control device (7) on the described heating unit (8), so that by the information that response sensor (4,5,6) provides, described steel band is remained on the temperature of determining in the exit of described heating unit.
CNB2004100284264A 2003-03-12 2004-03-11 Oxidation control method and electroplating activity line before the steel band continuous electroplating Expired - Fee Related CN100554489C (en)

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FR0303058A FR2852330B1 (en) 2003-03-12 2003-03-12 METHOD OF CONTROLLED OXIDATION OF STRIPS BEFORE CONTINUOUS GALVANIZATION AND LINE OF GALVANIZATION
FR03/03058 2003-03-12

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CN112461393A (en) * 2020-12-04 2021-03-09 中国科学院力学研究所 Coaxial thermocouple transient heat flow sensor oxidation type insulating layer processing and manufacturing device

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US20040177903A1 (en) 2004-09-16
KR20040080377A (en) 2004-09-18
EP1457580A1 (en) 2004-09-15
ES2226608T1 (en) 2005-04-01
CN100554489C (en) 2009-10-28
FR2852330A1 (en) 2004-09-17
DE04290508T1 (en) 2005-03-31

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