CN103806029A

CN103806029A - Method for producing a product from a flexible rolled strip material

Info

Publication number: CN103806029A
Application number: CN201310566367.5A
Authority: CN
Inventors: W·爱博莱恩; J·D·布莱赫特
Original assignee: Muhr und Bender KG
Current assignee: Muhr und Bender KG
Priority date: 2012-11-14
Filing date: 2013-11-13
Publication date: 2014-05-21
Anticipated expiration: 2033-11-13
Also published as: JP6266316B2; DE102012110972B3; US20180340266A1; US20170335481A1; JP2014132110A; CN103806029B; JP2018083986A; EP2733226A1; EP2733226B1; EP2733226B8; US20140134450A1

Abstract

The invention relates to a method for manufacturing a product from a flexibly rolled strip material comprising the steps: providing a strip material made from sheet steel, flexible rolling of the strip material, wherein a variable thickness is produced along the length of the strip material, electrolytic coating with a metallic coating material, which contains at least 93% of zinc, wherein the electrolytic coating is carried out after the flexible rolling, heat treatment at temperatures above 350 DEG C. and below a solidus line of the coating material, wherein the heat treatment is carried out after the electrolytic coating, working a blank from the flexibly rolled strip material and cold or hot forming of the blank.

Description

Manufacture the method for goods from the band of flexible rolling

Technical field

The present invention relates to a kind of band from flexible rolling and manufacture the method for coated steel sheet.Described steel plate prevents corrosion by coating protection.

Background technology

Become known for zinc or zinc alloy to apply the different methods of the component being formed from steel, as pot galvanize (galvanizing) or (electrolysis) of electroplating zinc-plated.Pot galvanize means the mode by pretreated steel part being immersed to liquid zinc melt, the plating with solid metal spelter coating to steel part.Galvanizing is implemented by workpiece being immersed to zinc electrolyte.Zinc electrode is because be base metal, as " sacrificial anode ".Will be by zinc-plated workpiece as negative electrode, because the feature of described coating is also cathodic anti-corrosion protection.

Patent DE 10 2,007 013 739 B3 disclose a kind of method for flexible rolling coated steel belt.Electrolysis applies heat-or cold belt steel, and follow-up by its flexible rolling, and wherein, the thickness of the steel band of described coating is along length and difference.After flexible rolling, regulate described coating according to the thickness of described steel plate, or regulate described coating according to rolling pressure in flexible rolling.Therefore, the variable thickness of described coating formation.

Patent DE 10 2,009 051 673 B3 disclose a kind of manufacture and have had the method for the steel band of cathodic anti-corrosion protective layer.Therefore, by described Band by Hot-rolling system, follow-up cold rolling and electrogalvanizing.After electrogalvanizing, in clock-type annealing furnace, to be with steel described in the heat-treated of 250 ℃ to 350 ℃ 4 to 48 hours, prepare thus zinc-iron layer.

Patent 10 2,007 019 196 A1 disclose a kind of production and have had the method for the band of the flexible rolling of cathodic protection layer.Said method comprising the steps of: provide rolling with steel as heat or the cold belt steel with cathodic protection layer, and the band steel of the rolling applying described in flexible cold rolling, in the operation of rolling, rolling roll gap is adjustable.

Patent DE 601 19 826 T2 disclose a kind of for obtaining the method with high-mechanical property workpiece, start from the steel plate strip steel forming by deep drawing methods (deep-drawing).Workpiece described in hot rolling, and use the alloy-coated of being made by zinc.Therefore, steel plate is cut to appropriate size, is heated to the temperature of 800 ℃ to 1200 ℃, and the hot deep-draw process of follow-up enforcement.Then,, by steel plate clout required described deep-draw process, remove by cutting.

Summary of the invention

The present invention is based on this object the method for the steel plate that a kind of band manufacture from flexible rolling applies is provided, it can provide particularly preferred corrosionproof protection.

First solution comprises the method for manufacturing goods from the band of flexible rolling, said method comprising the steps of: the band of being made up of steel plate is provided, band described in flexible rolling, wherein said band has variable thickness along length, with comprising 93%(at least in mass) the metal coating layer material electrolysis of zinc apply, wherein said electrolysis is implemented after being coated in described flexible rolling, higher than 350 ℃ and heat-treat lower than the temperature of described coated material solidus curve, wherein said thermal treatment is implemented after described electrolysis applies, processing is from the base of the band of flexible rolling, and the cold or thermoforming of described base.

Second solution is to manufacture the method for goods from the band of flexible rolling, said method comprising the steps of: the band of being made up of steel plate is provided, band described in flexible rolling, wherein said band has variable thickness along length, with the metal coating layer material electrolysis coating that at least comprises zinc and iron, processing is from the base of the band of flexible rolling, and the cold or thermoforming of described base.

The benefit of above-mentioned two kinds of methods is to implement after described electrolysis is coated in described flexible rolling.Therefore the coating that, it has realized described deposition has constant thickness along the length of the band of described flexible rolling.In addition, with regard to the scope of described band area, after rolling, there is higher intensity, protect reliably with protection against corrosion thereby there is layer thickness.Generally speaking, can shorten process period and the available coated material still less of manufacturing goods, this has wholesome effect to manufacturing cost again.

Be combined with the present invention, the goods of flexible rolling are interpreted as having variable thickness and have respectively rectangle base or steel band cutting form (cutting profile), that prepare from the band of flexible rolling by cut mechanically or laser cutting.As the band of flexible rolling, can use hot strip steel or cold belt steel, wherein these terms are interpreted as technical term.Hot strip steel refers to herein after preliminary heating by the rolled iron finished product (steel band) of Rolling Production.Cold belt steel refers to cold rolling steel band (band steel) herein, wherein last reduced down in thickness implements not have preliminary heating by rolling.Band (strip material) for rolling also can be described as carrying material (band material).

Should be understood that in the single method steps of above-mentioned two kinds of solutions, also can insert other steps.For example, after flexible rolling, also can provide band steel to strengthen.Processing from the base of described band can be implemented before or after described electrolysis applies.Therefore, " processing carries the base of steel " should comprise can be from the slab of described band punching press, and mean edge and still stay on described band steel and do not re-use, and, can implement described band simply to cut into partial block, especially pass through cutting process.The base that processing carries steel also can refer to produce base from band steel.

In the first solution, comprise 93%(at least in mass) the metallic coating of zinc be deposited on described band, wherein the ratio of zinc can especially be greater than 95,97 or 99 the even pure spelter coating of 100%(of mass percent).Apply for electrolysis, in the time that current metal refining is dosed to ionogen, can use the anode of being made by pure zinc or zinc and other alloying elements.The possible ion of described zine ion or other alloying elements is deposited on described band with atomic form, connects together as negative electrode, and forms coating.As the first solution provides; have high containing in the deposition of zinc ratio (being greater than 93 mass percents); thermal treatment and then causes the zinc of described deposition and the iron of described band protection to form alloy in a preferred manner, has therefore generally speaking prepared zinc-iron coating.

In the second solution, prepare zinc-iron-alloy layer by electrolytic deposition at the very start.The preferred selection like this of ratio of zinc and iron, make at least one in following condition effective: described alloy layer comprises the iron of at least 5 mass percents, described alloy layer comprises the iron of maximum 80 mass percents, and described alloy layer comprises that the zinc of minimum 20 mass percents and/or described alloy layer comprise the zinc of maximum 95 mass percents.Particularly preferably be, the zinc in the time of sedimentation state and iron ratio are selected like this: have δ 1-phase, especially δ 1-phase and the Г-phase of at least a portion, or only have intermediate metal Г-phase.For example, can be that 10 to 30 mass percents or zinc ratio are that 70 to 90 mass percents are realized by iron ratio, wherein do not get rid of and also can add other alloying elements.In the present embodiment, thermal treatment that need not be follow-up, because described coating itself has been protected zinc and iron.Zinc atom and iron atom are arranged mutually with the distance of several nanometers, therefore produce short especially the evolving path.However, it should be understood that, in the time carrying out electrolytic deposition with zinc-iron alloys, also can implement described thermal treatment.By described short the evolving path, very short thermal treatment is just enough, for example, by induction.Generally speaking, by the process of described method, can realize in a preferred manner and shorten process period.

Can be according to need not heat treated the first possibility implementing after described electrolysis applies and before being shaped according to the method for the second solution.According to the second possibility of the second solution, can provide more than 350 ℃ and lower than the thermal treatment of the temperature range of described coated material melt temperature (solidus curve), the further step after applying as described electrolysis.The solidus curve that is the mark of described coated material in finite state digraph is that line, only has solid phase below this line.More than described solidus curve, described coated material exists with melt at least partly.

Along with advance heat-up time, the iron ratio in described coating increases, because iron atom diffuses into described coated material from base material.Because described coating iron content ratio increases, can improve described thermal treatment temp, but must not meet or exceed described solidus curve.Under suitable time variable control, can reach the temperature of 781 ℃.In thermal treatment temperature increase possibility apparent be also effective to the first solution.Temperature can the stage or continuous rising with the increase of iron content ratio.

The liquidus line that is the mark of described coated material in finite state digraph is that line, has two-phase or multiphase scope, solid liquid phase below this line.More than described liquidus line, described coated material is liquid form.The bottom limit of described two-phase scope is take described liquidus line as feature.The temperature of described solidus curve depends on the ratio composition in described alloy.For pure zinc, described solidus curve is positioned at 419.5 ℃, and for zinc-iron alloy, maximum temperature is 782 ℃, also has part Г-phase within the scope of this.Therefore, while thering is corresponding iron content ratio, can be fully hard (with rolling time the same hard) in the situation that electrolysis apply the band of described flexible rolling, and implement thermal treatment in the relatively high temperature that is greater than 500 ℃ of maximums to 782 ℃ subsequently, and do not produce liquid phase.

Also use enforcement full annealed the 500 ℃ high thermal treatments to 782 ℃ of temperature ranges, therefore the material of described preparation is particularly suitable for indirect thermal shaping.Therefore, can save after flexible rolling and described coating before original necessary full annealed.For example, use pure zinc (100% zinc) the first described solution in, described heat treatment process can start from 380 ℃ annealing temperature and, along with the iron content ratio increasing because of diffusion process can be stage the temperature that is increased to the highest 781 ℃.

Be applicable to two kinds of solutions, described coated material also can comprise other alloying elements, for example manganese, chromium, silicon or molybdenum.Irrelevant with type and the number of described alloying element, feature of the present invention is that object is the described temperature control that forms described zinc-iron alloy layer.Described each alloy temperature is selected like this, the any time point forming at described alloy, all must not meet or exceed the solidus curve of the binary zinc-iron phasor of coated material described in the described composition of positive work in-process or comprise the solidus curve more than the layer structure of two kinds of alloying elements.Therefore, described alloy forms by solid phase diffusion.

In thermal treatment, there is the diffusion that enters described metallic coating from the iron of described coated material.In this case, the zinc of described coating changes into zinc-iron alloy, and cathodic anti-corrosion protection is provided.Described diffusion described is greater than 350 ℃ and be particularly preferred lower than the temperature range of described solidus curve, because can occur relatively fast.Because there is iron level, reduces the scolder fracture affinity of described coating, thereby increased the safe range of stress of described assembly.

As mentioned above, can pass through the first possibility of induction heating, realize inversion of phases.This working method is particularly suitable for electro deposited zinc and iron, because there is short the evolving path, thereby short thermal treatment can cause required inversion of phases.According to the second possibility, can implement described thermal treatment by annealing in clock class annealing furnace.This annealing is particularly suitable for the pure zinc of electrolytic deposition.Preferably, when annealing in described annealing furnace, provide 10 to 80 hours, the hold-time of preferred 30 to 60 hours, thus can obtain time enough, prepare zinc-iron alloy by diffusion.Preferably, the described hold-time (residence time) is characterised in that, in the described whole time, described base or described band are all heat-treated, and can comprise heating-, keep-and cooling stages.Another possibility is described conduction heating, but does not apparently get rid of heat treating method feasible in other technologies.

As other method step, can be before described electrolysis apply, provide and apply described band with a middle layer.Especially can use nickeliferous or aluminium lamination as middle layer.These layers, comprise at least part of nickel or aluminium, also can comprise pure-nickel-layer or aluminum layer.Described nickel dam forms the Additional Protection of effects on surface, and improves the adhesivity of described coating subsequent deposition and that comprise zinc.For example, described nickel dam can form by electrolytic deposition or without the deposition of the electric current from external source.Apparent, there is no to get rid of the other materials for described middle layer.For example, also can use the coating containing manganese or chromium.Manganese and chromium all have cubic(al)grating, and the solvability having had in iron, and this has wholesome effect to described alloy property.

According to a possible embodiment, after electrolysis applies, can be described band antiscale protection is provided.When hot formed austenitizing is not below while implementing in inert atmosphere, this is especially applicable.Dirt is mainly the product of oxidisability corrosion, is at high temperature in the reacting of metallic substance and air or other oxygen-containing gass, to produce.The deposition of described antiscale protective layer can be by spraying or rolling, point other coating and implementing.Except protection is with anti-oxidation, another benefit of described antiscale protective layer is that described surface has high quality.Particularly, in the scale removal (vanishing) of described steel plate below before, need not be as the clean of shot-peening.In addition,, because described antiscale protection, in described thermoforming and hot absorption behavior, described friction valve is subject to positive impact.Another benefit of described antiscale protective layer is to have improved the adhesivity that is arranged in described cathodic anti-corrosion protective layer below.In addition, for example, by described antiscale protecting materials and the formation alloy that is arranged in layer below, can widen the temperature-time window in austenitizing framework.Described antiscale protection can deposit before or after the described thermal treatment lower than solidus curve is implemented.

At the correct position of processing, can prepare base or die-cut part from the band of described flexible rolling, can implement by cut mechanically or by laser cutting.Base should be interpreted as especially from the rectangle thin plate of described band cutting.Die-cut part specifically refer to from the cutting of described band, exterior contour has been applicable to the lamella elements of described finished product form.What term base was mainly unified is used in reference to rectangle base and die-cut part.The manufacture of base can be implemented before or after described electrolysis applies, and can before or after deposition antiscale protective layer, implement if desired.

According to the possible processing and implementation mode that is suitable for two kinds of solutions, described thin slab is hot formed.Thermoforming refers to that workpiece was heated to the manufacturing process of described hot formed temperature range before being shaped.Described heating is implemented in as stove at a suitable heating unit.Described thermoforming can be implemented with roundabout process according to the first possibility, comprise cold described base preliminary shaping is called to preformed assembly step by step, subsequently at least a portion region of described cold preform assembly is heated to austenitizing temperature, and thermoforming is subsequently with the final profile of preparing product.Austenitizing temperature is interpreted as temperature range, wherein, at least has partial austenitizing (structural condition is in ferrite and austenite Binary-phase region).In addition, also can an austenitizing described in the subregion of base, to realize for example partially hardened.Described thermoforming can also be implemented with straight-forward procedure according to the second possibility, it is characterized in that, in a step by the austenitizing temperature of at least part of region direct heating of described base and be thermoformed into subsequently required final profile.Here there is not (cold) preliminary shaping above.Equally, in described straight-forward procedure, can realize partially hardened by the austenitizing of subregion.The sclerosis of the subregion of described assembly also can be by changing strengthening instrument or can providing the multiple types of tools material of different cooling to realize by using, and this is all effective for two kinds of processes.Under latter event, whole base or whole assembly can be completely by austenitizings.

According to all effective embodiments of corresponding two kinds of thermoformings, described coated material is preferably solid-state in the time of thermoforming initial time point, that is, temperature has been cooled to the region of described coated material subsolidus.After thermoforming, the iron-holder on border is lower than 80%, preferably lower than 60%, particularly preferred lower than 30%.

According to another implementation Process mode, all effective to above-mentioned two kinds of solutions in principle, described thin slab is also capable of cold forming.Cold shaping is the manufacturing process that described base does not have special heating before shaping.Therefore, described shaping is at room temperature carried out, and described base heats by charging dissipation of energy.Cold shaping is particularly useful as the method that forms vehicle body mild steel.

The solution of foregoing invention object also comprises the thin slab of making from the steel plate of flexible rolling, and this base applies with a metallic coating electrolysis after flexible rolling, and thermoforming after described coating.Therefore, obtained the benefit of the above-mentioned consistent length thickness with described base steel or that prepare thus along flexible rolling.Prepare described base according to above-mentioned one or more method stepss, the benefit that therefore relates to described step and be attached thereto with reference to description above.

Accompanying drawing explanation

Below, describe preferred embodiment in connection with accompanying drawing.

Fig. 1 is the indicative flowchart of the method according to this invention the first embodiment,

Fig. 2 is the indicative flowchart of the method according to this invention the second embodiment,

Fig. 3 is the indicative flowchart of the method according to this invention the 3rd embodiment, and

Fig. 4 is zinc-iron phasor.

Embodiment

Fig. 1 shown according to of the present invention, according to method the first processing and implementation mode, prepare goods for the band 2 from flexible rolling.In the step V1 of described method, process by flexible rolling the described band 2 that is rolled into coil 3 under starting condition more specifically by rolling.Therefore, use roller 4,5 rollings to there is the described band 2 of substantially more constant steel plate thickness in its length of flexible rolling forward position, thereby prepare variable steel plate thickness at the longitudinal direction of described rolling direction.In rolling, monitor and control described process, wherein, the input signal that acts on dancer rools 4,5 for the data of measuring from thickness measure for steel plate 6.After flexible rolling, described band 2 has variable thickness in rolling direction.After described flexible rolling, again described band 2 is rolled into coil, thereby it can be transferred to next method steps.

After flexible rolling, described band 2 is in method steps V2, smooth by implementing in a band steel straightening device 7.Described smooth method steps is optional and can saves.

Respectively at described flexible rolling (V1) or described smooth (V2) afterwards, in method steps V3 for described band 2 provides erosion shield.Therefore, described band 2 is through an electrolysis band steel coating unit 8.Apparent, described standby with running through charging legal system with steel coating, that is, described band 2 rolls out from coil 3, by described coating unit 8, and after coating procedure, is again involved in coil 3.This procedure is particularly preferred, because described erosion shield is deposited on, processing costs on described band 2 is low and described process velocity is high.Described coating unit 8 comprises the immersion tank 9 of having filled electrolyte 10, and described band 2 is through this groove operation.The guiding of described band 2 obtains by

roll stacks

11,12.

It is the washing material realization by comprising at least 93% zinc that the electrolysis of embodiments of the present invention applies.Because high zinc content, has obtained particularly preferred protection against corrosion.Should be understood that described zinc content also can be higher, for example, be greater than 95%, be greater than especially 97% and be even 100% (pure zinc).For coating procedure, for example can use the anode of being made by zinc, in the time of galvanization, zine ion is released into ionogen.Described zine ion deposits and forms zinc layer at described band 2 with the form of zinc atom, connects together as negative electrode.Or, can use inert anode and zinc electrolyte.

Except zinc ratio above-mentioned, described coated material also can comprise other alloying elements, for example aluminium, chromium, manganese, molybdenum or silicon.If desired, the ratio of the alloying element of described interpolation is less than 7%.The solvability that manganese has had in iron, this hankers alloy and forms and have a wholesome effect adding.

Apply (V3) afterwards in described electrolysis, in method steps V4, thermal treatment is rolled into the described band 2 of coil 3.In principle, described thermal treatment can be implemented in the applicable mode of any technology, for example, in as the annealing furnace of clock-type annealing furnace or also can pass through induction heating, only enumerate two kinds of methods as an example.In situation of the present invention, described thermal treatment shows in stove 13.

Described thermal treatment is implemented being greater than at 350 ℃ and temperature lower than the solidus curve of described coated material.The temperature curve of described solidus curve depends on the ratio composition in described alloy.Within the scope of said temperature, can cause iron and diffuse into described zinc layer, thereby along with the propelling of heating source hold-time, preparation one diffusion layer.

In thermal treatment, there is the diffusion that enters described metallic coating from the described iron by coated band.In this case, the zinc of described coating changes into zinc-iron alloy, and cathodic anti-corrosion securing system is provided.Because described temperature range is greater than 350 ℃ and lower than described solidus curve, so described diffusion can occur in preferably 10 to the 80 hours heat treated hold-time in annealing furnace relatively fast, preferred 30 to 60 hours, thus time enough can be obtained, prepare zinc-iron alloy by diffusion.

Described heat treated another impact is reduced or eliminated the sclerosis of the material of preparing in rolling, thereby the band of described rolling 2 to have higher toughness and elasticity again.In method steps below, described band can be easy to processing more, wherein, can further be subject to active influence by the material character of manufactured finished product.

In thermal treatment (V4) afterwards, in next step method steps V5, can process single plate slab 20 from described band 2.Preferably undertaken by punching press or cutting from the processing of the single plate slab 20 of described band 2.Depend on the shape by manufactured plate slab 20, these can be from described band as the punching press of shape cutting member, and wherein said band band still retains and do not re-use, or described band 2 can just cut into the piece of multiple parts according to length.As be schematically shown, the plate slab 20 of processing from described band 2 is also for having the feature of three dimension steel plate base (3D-TRB).

Preparing plate slab 20 from described band 2, in method steps V5, described base 20 is being formed to required finished product.Described base 20 is hot formed according to the first possibility or is cold shaping according to the second possibility.

Thermoforming can be direct or indirect implementation Process.In described straight-forward procedure, described base 20 is heated to austenitizing temperature before shaping, and heating can be by for example responding to or completing in stove.In this case, austenitizing temperature is a temperature range, wherein, at least has partial austenitizing (structure is in ferrite and austenite Binary-phase region).But the subregion of described base also can be by austenitizing, thus for example partially hardened.Be heated to after described austenitizing temperature, described heated base is at figuration instrument 14(forming tool) in be shaped and simultaneously cooling with high speed of cooling, wherein said assembly 20 obtains its final profiles sclerosis simultaneously.

In described indirect thermal is shaped, described base 20 preliminary shaping between austenitizing.Described preliminary shaping carries out in the cold situation of described base, that is, and not heating.In described preliminary shaping, described assembly obtains its profile, although do not correspond to net shape, approaching.Then, after preliminary shaping, carry out austenitizing and thermoforming, and similar in straight-forward procedure, wherein said assembly obtains its net shape and is hardened.

Can provide in the scope of thermoforming (directly or indirectly), the carbon containing ratio of described steel should be at least 0.1 mass percent, is up to 0.35 mass percent.

Except thermoforming as figuration process substitute, described base is also capable of cold forming.Described cold shaping is particularly suitable for vehicle body mild steel or assembly, because they do not have special requirement to intensity.In described cold shaping, described base is at room temperature shaped.

One specific features of method according to the present invention is that described electrolysis coating (V3) is implemented afterwards at described flexible rolling (V1).The coating being deposited on described band 2 has constant thickness along its length, that is, irrelevant with described band 2 thickness separately.In addition, there is the region of less thickness by stronger being rolling to, have and can protect reliably etch-proof enough thick coatings.Another concrete feature is after described electrolysis applies, higher than 350 ℃ and lower than described coated material solidus curve between the heat treatment step of temperature range.Because described thermal treatment, zinc diffuses into base material and iron diffuses into described coating from described base material from described coating.Along with the increase of iron ratio in coating, the temperature in heat treated can slowly raise, because described solidus curve moves to higher temperature.Prepare zinc-iron alloy as coating, this coating also can tolerate if desired higher temperature in subsequent thermal forming process, and reliable anti-corrosion protection is provided.

The order that should be understood that the method according to this invention also can change.For example, can between above-mentioned step, provide an intermediate steps (not showing separately) here.For example, before described electrolysis applies, can be described band provide a middle layer, particularly nickel-, aluminium-or manganese layer.The Additional Protection of described middle layer shaping effects on surface, and the adhesive capacity of raising coating subsequent deposition and that comprise zinc.Also can described electrolysis apply (V3) afterwards with described thermal treatment (V4) before, for described band or the base of manufacturing thus antiscale protection is provided.When hot formed austenitizing is not below while carrying out in inert atmosphere, this is especially desirable.The deposition of described antiscale protection can be applied and be implemented by spraying or rolling press.Except protection is with anti-oxidation, another benefit of described antiscale protective layer is that described surface has high quality.In addition, in described thermoforming, frictional coefficient and described hot absorption property are subject to actively affecting of described antiscale protection.Another benefit of described antiscale protective layer is to have improved the adhesivity that is arranged in described cathodic anti-corrosion protective layer below.In addition, for example, by described antiscale protecting materials and the shaping alloy that is arranged in layer below, can widen the temperature-time window in austenitizing.One of such example is the aluminium foil in antiscale protective paint.

Should also be understood that processing according to the present invention also can change in the time relating to the order of described implementation step.For example, the processing of base also can be implemented at another point, for example, before described electrolysis applies or if desired before or after deposition antiscale protection.

Fig. 2 shown according to of the present invention, according to method the second processing and implementation mode, prepare plate slab for the band 2 from flexible rolling.This is very most of corresponding to Fig. 1, therefore based on similarity, and can be with reference to description above.Meanwhile, assembly or step identical or that revise have the Reference numeral identical with Fig. 1.The difference of present method will be specifically described below.

Method steps V1 (rolling), V2 (band steel aligning), V5 (punching press) are the same with method steps V1, V2, V5 and V6 in Fig. 1 with V6 (shaping).

First difference of the method for present embodiment and Fig. 1 is the method steps V3 that described electrolysis applies.In this working method shown in Fig. 2, apply described band with comprising at least metal coating layer material of zinc and iron.Described zinc-iron alloy layer is prepared by electrolytic deposition zinc-iron layer.According to a preferred working method, zinc-iron ratio is to select so in this case, described alloy layer comprises the iron of at least 5 mass percents and/or maximum 80 mass percents, or described alloy layer comprises the zinc of at least 20 mass percents and/or maximum 95 mass percents.

Particularly preferably be, the zinc in the time of sedimentation state and iron ratio are selected like this: have δ 1-phase, especially δ 1-phase and the Г-phase of at least a portion, or only have intermediate metal Г-phase.Therefore, the iron content ratio of for example described coating can be selected between 10 and 30 mass percents, or is selected from 70 to 90 mass percents containing zinc ratio.In these ratios, in the time of sedimentation state, at least intermetallic phase of forming section.

When Г-phase content is relatively high and δ 1-phase content as far as possible hour, be preferred for implementing that direct heat is shaped.In order to prevent scolder cracking or fracture, should be relatively high for the melt temperature of hot formed described coating.Along with the increase of iron content ratio and therefore along with the increase of Г-phase ratio, move to higher temperature in the described solidus curve of zinc-iron binary phase diagram (see figure 4).

Apply (V3) afterwards in described electrolysis, in method steps V5, process base from described band 2, wherein apparent, described base also can the working method with modification cut before applying.

Another feature of the order of the present method shown in Fig. 2 is, applying between (V3) step and shaping (V6) step, not have interconnective in the thermal treatment lower than implementing under solidus temperature.Therefore, the time of the method for Fig. 2 is short especially.

The enforcement of follow-up forming step is corresponding to Fig. 1, and what therefore relate to this content can be with reference to description above.Described base 20 can be cold or thermoforming (directly or indirectly).

Should be understood that in order of the present invention, also can modify, particularly implement extra intermediate steps or follow-up method steps.Therefore, for fear of repetition, the reference that relates to this content description above.

Fig. 3 shown according to of the present invention, according to method the 3rd working method embodiment, prepare plate slab for the band 2 from flexible rolling.This is mainly corresponding to the combination of the method for Fig. 1 and 2, while therefore relating to similar with reference to description above.Meanwhile, assembly or step identical or that revise have identical Reference numeral.

Step V1 (rolling), V2 (band steel aligning), V3(electrolysis apply), V5 (punching press) and V6 (shaping) be with in Fig. 2, method steps is the same accordingly.Only be with the method difference of Fig. 2, apply (V3) afterwards in described electrolysis, in method steps V4, implement thermal treatment (as the method for Fig. 1).

Similar with the working method of Fig. 1, the specific features of this working method of Fig. 4 is also the temperature control in order to form zinc-iron alloy layer.In thermal treatment (V4), described each alloy temperature is selected like this, at any time point that forms described alloy, all must not meet or exceed the solidus curve of described binary zinc-iron phasor (see figure 4) or comprise the solidus curve more than the layer structure of two kinds of alloying elements.

One of example of this layer structure is for example ternary alloy from zinc, iron and manganese, wherein said manganese derives from described steel base and adds by above-mentioned the zinc layer or the zinc-iron alloy layer that diffuse into described electrolytic deposition hankered, and shapeless be the part of electrolytic deposition.Except manganese, for example chromium or aluminium or silicon or molybdenum also can diffuse into the layer of described electrolytic deposition.Should be understood that also can be described coating provides Steel Alloy element, it not yet list up to now and be suitable for by above-mentioned heat-processed diffuse into described electrolytic deposition layer.

In addition, in order of the present invention, also can modify, particularly implement extra intermediate steps or follow-up method steps.For fear of repetition, the reference that relates to this content description above.

Fig. 4 has shown the phasor of zinc-iron.X-axis has shown respectively the ratio of iron (Fe) and zinc (Zn).In this case, there is the material containing 100% iron and 0% zinc in the left side, and the right exists the material containing 100% zinc and 0% iron.Between two edges, can find the corresponding percentage ratio constituent marking in X-axis.S characterizes melt substance, and α and γ are iron zinc mixed crystal systems (Fu Tie), and ζ and δ or δ 1 and Г are intermetallic phases, and η is zinc-iron mixed crystal system (rich zinc).

Below, will be by zinc-iron phasor, exemplary description is according to the different possibilities of the electrolytic deposition of a method of the present invention.

In deposition pure zinc layer, the preparation of its available working method as Fig. 1, when beginning, selection is higher than 350 ℃ and lower than the alloy temperature of the melt temperature (solidus curve) of 419.5 ℃, as 400 ℃.At this temperature, there is the iron diffusion that enters described zinc layer, therefore, along with the continuing of thermal treatment (V4) hold-time, form diffusion layer as δ-phase.Further temperature processing is such, and each temperature is always lower than the solidus curve of described binary zinc-iron phasor.

In the electrolytic deposition of the coating that has comprised iron in zinc layer, its available preparation of the working method as Fig. 3, starting temperature can be selected the melt temperature higher than pure zinc.For example, in the time that the layer of described electrolytic deposition consists of 85% zinc and 15% iron, starting temperature can be selected 600 ℃.This temperature is in fact higher than the melt temperature of zinc, but at the subsolidus of two-phase scope Г+δ 1.

The zinc-iron layer being made up of 60% zinc and 40% iron for electrolytic deposition, starting temperature can be less than 782 ℃.Only described layer in subsequent heat treatment enrichment iron, and for example, while only there is austenitic iron mixed crystal (iron of 70 mass percents and 850 ℃), just can be increased to higher than this temperature.

As mentioned above, heat treated type is not predetermined.For example, can be induction heating or in annealing furnace heating or by the heating contacting with hot body, for example contact with thick steel plate, heat can be delivered to described base or profile cut part.

In an embodiment of the present invention, it is 8 to 12% electrolytic zinc iron alloy that iron content ratio is provided.In this case, as used by steel, it is to have (galvannealed) composition of coating of what is called " pot galvanize ".The benefit of said composition is, the distance of element zinc and iron, in nanometer range, therefore can be saved extraction DIFFUSION TREATMENT.Only, by the short thermal treatment of method steps V4, the zinc-iron alloy that can be just 8 to 12% from the iron content ratio of electrolytic deposition is prepared intermediate metal δ 1-phase.Such composition can be used for cold shaping and thermoforming.

In another embodiment of the present invention, deposit the zinc-iron alloy of electrolysis, its chemical dose forms corresponding to Г-phase.Or, also can by deposition have low iron content ratio zinc-iron layer and follow-up, exist the thermal treatment of Г-phase to reach this composition while finishing.This layer only just starts melting in the time of 782 ℃, and therefore this layer is particularly suitable for thermoforming because in this case, can by the element from steel base as manganese (three-part system iron zinc-manganese) stablize as described in layer, to limit or to prevent from forming melting phase.

At also another embodiment for thermoforming (V6), electrolytic deposition one deck, even for example,, when be heated to maximum austenitizing temperature (900 ℃) for thermoforming, itself does not also exist with molten state.Such coating for example can have the composition of the zinc of 20 mass percents and the iron of 80 mass percents.In this case, it is the ferrous alloy of two rod iron Zn systems.

Generally speaking, utilize the method according to this invention, can manufacture the goods with reliable cathodic anti-corrosion protection, be particularly suitable for for thermoforming process.By in the coating in this process at least to the degree of the liquid phase that may prevent from being shaped, minimized in a preferred manner the susceptibility of the scolder fracture of described goods.

Reference numerals list

2 bands

3 coils

4 rolls

5 rolls

6 gauge control

7 flattening devices

8 coating units

9 immersion tanks

10 ionogen

11 roll stacks

12 roll stacks

13 stoves

14 molding tools

20 bases (blank)

V1 – V6 method steps.

Claims

1. the method for manufacturing goods from the band of flexible rolling, said method comprising the steps of:

The band of being made up of steel plate (2) is provided,

The described band of flexible rolling (V1) (2), wherein forms variable thickness along described band (2) length,

Apply (V3) with the metal coating layer material electrolysis that comprises at least 93% zinc, wherein said electrolysis is implemented after being coated in described flexible rolling (V1),

Higher than 350 ℃ and heat-treat (V4) lower than the temperature of described coated material solidus curve, wherein said thermal treatment is implemented after described electrolysis applies (V3),

Process (V5) base (20) from the band (2) of flexible rolling, and

Cold or the thermoforming (V6) of described base (20).

2. the method for manufacturing goods from the band (2) of flexible rolling, said method comprising the steps of:

Band from steel plate (2) is provided,

With the metal coating layer material electrolysis coating (V3) that at least comprises zinc and iron,

Process (V5) base (20) from the band (2) of flexible rolling,

Cold or the thermoforming (V6) of described base (20).

3. method as claimed in claim 2,

It is characterized in that

As additive method step, after applying (V3), described electrolysis implements thermal treatment (V4), and described thermal treatment (V4) is higher than 350 ℃ and implement lower than the temperature of described coated material solidus curve.

4. the method as described in claim 2 or 3 any one,

It is characterized in that

With the following iron that one of at least comprises:

At least 5% iron,

80% iron at the most.

5. the method as described in claim 2 to 4 any one,

It is characterized in that

Select the ratio of zinc and iron, make to exist in sedimentation state δ 1-phase, especially δ 1-phase and the Г-phase of at least a portion.

6. the method as described in claim 1 or 3 any one,

It is characterized in that

Rising temperature in thermal treatment (V4).

7. the method as described in claim 1 or 3 any one,

It is characterized in that

Described thermal treatment (V4) is by responding to or annealing and implement in clock-type annealing furnace, and special, while wherein implementing described annealing, the hold-time is 10 to 80 hours.

8. the method as described in claim 1 to 7 any one,

It is characterized in that

Provide following and apply (V3) additive method step before as electrolysis:

With middle layer, especially the layer that comprises nickel or aluminium or manganese applies described band (2).

9. the method as described in claim 1 to 8 any one,

It is characterized in that

Provide following and apply (V3) additive method step afterwards as electrolysis:

Deposition antiscale protection.

10. the method as described in claim 1 to 9 any one,

It is characterized in that

Described thermoforming (V6) comprises below step by step:

Base described in cold preliminary shaping (20), becomes cold preformed assembly,

At least a portion region of described cold preformed assembly is heated to austenitizing temperature,

Described in thermoforming, cold preformed assembly is to prepare final profile.(roundabout process)

11. methods as described in claim 1 to 9 any one,

It is characterized in that

Described thermoforming comprises below step by step:

At least a portion region of described base (20) is heated to austenitizing temperature,

Base described in thermoforming (20) is to prepare final profile.(straight-forward procedure)

12. methods as described in claim 1 to 11 any one,

It is characterized in that

At the time point that starts thermoforming (V6), described coated material is solid state.

13. goods of preparing from the steel plate of flexible rolling, described goods apply and thermoforming after described coating with metallic coating after described flexible rolling, and described goods are that the method for special basis as described in claim 1 to 12 any one manufactured.