CN1074949C - Method and plant for mfg. deep-drawing steel strip or sheet - Google Patents

Abstract

In the process of manufacturing steel strips or steel plates which can be used as deep-drawing steel used for manufacturing can bodies by a deep-drawing and ironing method, the operation comprises the following steps: providing low-carbon steel in the form of a slab; rolling the slabs in an austenitic area to reduce the thickness of the slabs to transfer thickness; cooling the rolled slabs with the transfer thickness into a ferrite area; rolling the rolled slabs in the ferrite area to completion thickness. In order to provide steel which reduces the tendency to produce lugs in the manufacture course of can bodies, the transfer thickness is smaller than 18mm, and the total thickness reduction from the transfer thickness to the completion thickness in the ferrite area is smaller than 90%.

Description

Make the method for deep-draw steel band or steel plate

The present invention relates to the manufacture method of steel band or steel plate, this steel band or steel plate are suitable for being used as with deep-draw and deep-drawing method and the used deep-draw steel of Production Example such as cylinder of steel housing.The deep-drawing method is also referred to as the ironed method of wall sometimes.

In order to be suitable for doing the deep-draw steel, a kind of steel of grade must satisfy some requirements, wherein have several important requirements to be discussed below.

For the so-called two piece can that obtains to seal, first of this jar is made of the housing that comprises pedestal, and second then is lip.Make first with deep-draw steel flat blank, this blank is the goblet of diameter 90mm, high 30mm for example by deep-draw at first, and then is the jar of diameter 66mm, high 115mm for example with its deep-drawing.In the different production phases, the index value of thickness of steel product is: the blank initial thickness be 0.26mm, hypanthial base thickness and wall thickness be 0.26mm, jar base thickness be 0.26mm, jar half thickness of highly locating be 0.09mm, jar top margin thickness be 0.15mm.

This example shows that in order to make cylinder of steel, the deep-draw steel must have good formability, and must keep this kind performance overtimely, so that store and transportation.In other words, the deep-draw steel must not be vulnerable to the influence of ageing.The ageing meeting makes steel plastic force height, produces the crack when being shaped and causes blemish by stretcher tension force.A kind of mode of ageing resistanceization is so-called overagingization, takes this kind mode, is the ageing symptom being had the carbon of influence largely, separating with controlled manner, and make its diffusion that or else can misplace in steel.

So that save material, also require the formability height in order to use very light cylinder of steel, so that can become the minimum as far as possible completion thickness in tank skin and tank deck limit to the set initial thickness of blank.The top margin of jar especially needs to use the deep-draw steel.After having formed jar with the deep-drawing method, the diameter of top margin has reduced, and promptly so-called reducing so that adopt less lip, thereby is saved lip material.After reducing, use flange one along the top of top margin, just can connect lip.Especially flange is adopted in reducing in addition, this two procedures, when forming for housing XianCheng the deep-draw steel of shape, require its extra formability height.

Except formability, the purity of steel is also very important.Purity is meant it mainly is the degree of oxygen-free impurity or gas folder addendum.This class impurity betides the oxygen blast steel maker when producing steel, and used casting powder when resulting from continuous casting and making the steel billet of deep-draw steel stock.In reducing or form under the situation of flange, impurity can cause the crack, and crack itself then is after this when pack into object and produce the reason of leakage when sealing of cylinder of steel.Under the situation of storing with transportation, an object spills and can cause harm in jar, especially can pollute, and near other jars or the article it, the pollution that causes surpasses leaks jar and many times on object wherein.The thickness at jar edge is more little, and the risk that forms the crack because of impurity is just big more.Therefore, the deep-draw steel must not contain any impurity.

Another requirement relates to the anisotropy degree of deep-draw steel.When making the ironed two type jars of deep-draw/deep-drawing or wall, jar top margin be not that Shunping County's face extends, but be rendered as wave mode round the periphery of jar.The insider claims that crest is a lug.The tendency that forms lug (" going out lug ") is that the anisotropy of deep-draw steel causes.Lug must be minimum trough by switchback, so that obtain to form the top margin of flange in the plane, does like this and can cause material unaccounted-for (MUF).

Consider from the angle of operation operation, bring the making that goes into operation with thick 1.8mm or thicker hot rolled plate or hot rolling usually.The thickness of attenuate about 85%, final thickness is about 0.27mm.In order to make each jar material therefor less, require completion thickness less, preferably less than 0.21mm.The existing people of standard value who is about 0.17mm has proposed.Therefore, for the set initial thickness that is about 1.8mm, just require attenuate more than 90%.Because the cause of conventional concentration of carbon, do like this and can cause forming big lug, such lug is cut away then can cause extra material unaccounted-for (MUF), and can offset a part of advantage of less thickness.The way that solves is Ultra-low carbon steel (ULC steel).The common acceptable concentration of carbon of this kind steel is lower than 0.01%, even low to 0.001% or lower, and it is blown into more oxygen in the steel molten bath and burns more carbon and make in oxygen blast steel mill.After this, if reach requirement, will carry out the vacuum ladle processing for lowering concentration of carbon again.Be blown into more oxygen in the steel molten bath, also can form unwanted metal oxide in the steel molten bath, these oxides can become impurity and be trapped in the strand, then are trapped in the cold-rolled strip later on.The influence of impurity is amplified by the less completion thickness of cold rolling steel.As mentioned above, because impurity can cause the crack, thereby harmful.This shortcoming that causes because of less completion thickness is comparatively to be suitable for to the ULC steel.As a result, the ULC steel rate of recovery in order to pack cause to various grades is just very low, because a large amount of waste products are arranged.

A procedure of producing system jar used steel has been described for EP-A-521808 number, and the final thickness of given example is 0.18mm.This operation relates to cold rolling afterwards in the hot rolling of austenitic area, promptly is heated to for example 660 ℃ between two cold rolling stages again.The carbon content of used steel is 0.005% to 0.15%.Not mentioned at austenitic area rolled steel thickness.

EP-A-504999 number a procedure has been described, in this procedure, thickness is plate slab elder generation's quilt " soft depressing " before core is not fixed of 45mm, then by continuous casting.On a single roll down station, this thickness is reduced to 15mm.Subsequently, this slab can be heated again, just can coil then.After this, it rolled in the austenitic area for 1.5mm is thick before this just by continuous rolling, then ferrite area roll for 0.7mm thick.As if this steel too thick as the deep-draw steel of cylinder of steel housing.

The operation of making the formable steel band together has been described for EP-A-0370575 number.In this operation, the steel of fusion is the slab that is thinner than 100mm by continuous casting.This slab is cooled into ferrite area if desired then after pre-attenuate, and to be rolled in this district be 0.5 to 1.5mm final thickness.

A kind of method of making the formable steel band has been described for EP-A-0306076 number.In the method, continuous finished thickness is cast less than the slab of 100mm, and this slab is rolled into thickness in the austenitic area be 2 to 5mm steel band.This steel band ferrite area more than 300 ℃ that is cooled, and to be rolled in this district be 0.5 to 1.5mm final thickness.

The mild steel that the purpose of this invention is to provide the various grades of a kind of usefulness especially carbon content is the method that 0.1% to 0.01% steel are made the deep-draw steel.Use the method, the material yield rate height can reach minimum completion thickness, and other advantages are arranged.

According to the invention provides a kind of method of making steel band or steel plate, this steel band or steel plate are fit to be used as with deep-draw and deep-drawing method produces the used deep-draw steel of cylinder of steel housing, and this method comprises the steps:

(ⅰ) liquid mild steel is made the first pressing slab of thickness less than 100mm by means of conticaster;

(ⅱ) utilize the casting heat, make its reduced thickness for transmitting thickness at the austenitic area rolled slab;

(ⅲ) (ⅱ) gained set by step being had the slab that transmits thickness cools off into ferrite area;

(ⅳ) slab rolling that (ⅲ) gained was set by step rolled at ferrite area becomes completion thickness.

Wherein, transmitting thickness less than 1.5mm, is that total thickness decrement of above-mentioned completion thickness is less than 90% and greater than 75% at ferrite area transmitting reduced thickness.According to said method steel band of Zhi Zaoing or steel plate, its advantage is that the tendency that goes out lug has reduced in deep-draw and deep-drawing subsequently.Anisotropic degree depends on concentration of carbon, and the deep-draw steel are in total rolling attenuate amount that ferrite area bore.

Basis of the present invention is further to understand along with the total attenuate that is converted to ferrite area from the austenitic area forms most important for lug, and can make and carry out cold rolling attenuate in the ferrite area, remain in the set limit of set carbon content, method is to allow enough thin thin plate enter ferrite area, thereby prevents or limit the formation of lug.

In a preferred embodiment of the method that is consistent with the present invention, total attenuate rolling in ferrite area is no more than 88%, preferably is no more than 87%.Thereby the anisotropic minimum of a value of the degree of rolling attenuate depends on concentration of carbon, and the low more then attenuate of concentration of carbon is many more.Under the mild steel situation, thereby form for each anisotropy of minimum lug for minimum, the scope of cold rolling attenuate is less than 87%, preferably less than 85%.Relevant with good forming property, total attenuate is greater than 75%, more preferably greater than 80%.The completion thickness of steel can be less than 0.20mm, even less than 0.15mm.

Attenuate in that ferrite area carries out is transmitting under the recommendation form situation of the present invention of thickness less than 1.5mm, can be littler and littler because of completion thickness.

By the deep-draw steel that method of the present invention provided, can make with well-known technology and equipment.Like this, the deep-draw steel that can make are thinner than what can produce up to now.Especially available prior art is rolled in ferrite area and other processing.

The foundry engieering difference used according to reality is to make steel band with the bloom slab of thickness 50mm to 250mm routinely.This method can be used among the present invention.Perhaps to after pre-attenuate, be cooled to environment temperature to this cast slab, temporarily store and perhaps will be repaired, and then be heated in the austenitic area.In the austenitic area, steel billet is hot rolled into the transmission thickness that closes requirement.By actual used conventional method, this thickness is 1.8mm or thicker.Then, again the steel billet in the ferrite area is rolled into the steel band that closes requirement completion thickness.

In a preferred embodiment of method according to the invention, in order to make steel band, be the mild steel continuous casting of fusion bloom slab, again this steel billet is rolled into transmission thickness in the austenitic area, and don't this steel billet is cooled to outside the austenitic area.This kind method is preferably utilized the casting heat in the continuous processing, promptly steel generally speaking at least before transmitting thickness and not reaching without undergoing heating again, and only stand heat by rolling processing generation.

The advantage of this embodiment is that the process segment quantity of separating separately is few.Like this, saved owing to inject and emit these stages, material yield rate is just than higher.In addition, when the casting heat in the usefulness steel billet is rolling in the austenitic area, can reaches higher energy and reclaim.And, because this method has continuity largely, just can lighter device assembles carry out this method.Under this kind condition, continuously processing also is understood to include such process: steel billet temporarily is stored in the austenitic area one and is coiled in the equipment that equipment is also referred to as take-up case, therefore utilizes the casting heat simultaneously.

A problem of running into during hot rolling steel billet is during rolling because radiation loss and heat are dissipated on the chilled roll, and steel billet temperature is descended.From the Modulatory character of quality requirement and rolling processing, temperature decline is undesirable under the austenitic area; Make to enter temperature and increase avoiding and below the austenitic area, move, all can be subjected to the oxide restriction of quickening to form.Acceleration strengthens mill speed and also is restricted, because can make steel band that the tendency of flight is arranged.In the austenitic area, can fully be rolled into described transmission thickness in order to ensure steel billet, in a preferred embodiment of the method, after continuous casting just at fixed steel billet, its thickness is less than 100mm, above-mentioned step (ⅱ) comprises steel billet is rolled into the semi-finished product steel billet in the austenitic area, the semi-finished product steel billet is reeled in coiling equipment, make in the furnace apparatus of semi-finished product steel billet before at least one is placed in the coiling operation and coils equipment and stand the temperature processing that homogenizes, and from coil equipment, after the uncoiling, it is rolled into transmission thickness in the austenitic area at the semi-finished product steel billet.

For example induction furnace of furnace apparatus has been arranged, mainly betided the thermal losses on surface, just can be compensated as long as suitably handle.If it is in order to coil, also can to remove heat on demand that heating furnace is installed.Alternately, also, temperature provides heating furnace for homogenizing.In coiling equipment, also have changes such as a kind of temperature to betide between billet surface and the steel billet core.Profile is better in order to make, performance is more consistent, and steel billet is also made homogeneous and handled along its width.

The professional is clear, even only use furnace apparatus or only use and coil heating furnace, this advantage has at least a part to reach, and the present invention is not limited to these two kinds of parts combinations..

Because quantity and the scale in attenuate stage are carried out in the austenitic area, carry out this kind method, thereby make the thickness of semi-finished product steel billet be 5 to 25mm, be preferably 5, just be beneficial to 20mm.Like this, just can to the mill stand quantity in the previous coarse equipment of coiling equipment, to coil after the equipment the annealing rolling equipment and to the energy of the roll that will install, make preferred.

An embodiment of this method is particularly favourable, and in this embodiment, a kind of non-oxide atmosphere remains on the steel surface, because have this atmosphere of a period of time at least in the austenitic area.In the austenitic area, be that with rolling relevant a series of problems temperature rises highly more, the billet surface oxide forms just soon more, has finally constituted the maximum restriction that enters the temperature aspect to ausrolling.By processing billets in the non-oxide atmosphere of a part at least, in any case the formation of oxide skin(coating) also can be restricted.This just means, can select the higher time of staying that enters temperature or lack in the austenitic area.Thereby, can use relatively simple mode, acquisition is less than 1.8mm even close the transmission thickness of requirement like this less than 1.3mm.Found that on a small-scale transmitting thickness can reach about 1.0mm.

In an outstanding resultful method embodiment according to the invention, non-oxide atmosphere is coiled in the equipment a furnace apparatus or one at least and is kept, or all keeps in these two kinds of equipment.In the furnace apparatus of routine, steel billet is exposed to the following a very long time of surrounding atmosphere, and can not get protection.Make this atmosphere non-oxide, the effect that is reached, it is less to make at least that in furnace apparatus oxide forms, or can not form.The steel billet of being reeled is being coiled in the equipment under higher temperature and is being stopped the long period.In coiling equipment, keep the non-oxide effect that atmosphere reached can make do not have oxide skin to form, and this was unimaginable originally, especially more unexpected under the situation that steel billet temperature is high.

The present invention can carry out in a kind of complete set of equipments in order to manufacturing steel band or steel plate, and it has:

A) in order to cast the conticaster of steel billet;

B) in order to adjust the furnace apparatus of the steel billet temperature on conticaster, this equipment has a shell, and it has an inlet, an outlet and a path that supplies steel billet from the outlet of inlet migration, and this shell is keeping a kind of atmosphere that meets the requirements on this paths;

C) in order to wind the equipment of coiling from the steel billet of furnace apparatus, this equipment has one for the volume base provides enclosure space and the shell of the atmosphere that maintenance meets the requirements in enclosure space, and the shell of coiling equipment has an inlet that supplies steel billet to enter;

D) in order at steel billet and after coiling the equipment uncoiling, in the austenitic area, billet rolling is become to transmit the ausrolling equipment of thickness; And

E) in order to above-mentioned steel billet, in ferrite area, be rolled into the steel band of final thickness or the ferrite rolling equipment of steel plate with the requirement of closing with transmission thickness.

Wherein, the outlet of furnace apparatus can be coiled working off one's feeling vent one's spleen of equipment and thickly and removably is connected basically with above-mentioned.This complete set of equipments also has steel billet thickness attenuate and device of usefulness between conticaster and furnace apparatus.

This complete set of equipments is preferably at least one furnace apparatus and coils in the equipment, and the device that provides with the contacted nonoxidizing atmosphere of above-mentioned steel billet is provided.

A kind of like this equipment and its advantage, and some specially for carrying out examples, in international patent application " in order to make the complete set of equipments of steel band ", illustrated that the submission date of this application was the same with the application, with be same applicant's name, cross reference number is HO848.The content of this application is used as reference and comprises in this application.

Furnace apparatus is constructed to electric furnace usually, gives birth to heat or induction heating by means of impedance in stove, to the steel billet supplying energy, thereby steel billet cool off owing to the scale removal that sprays water with high pressure and because of heat loss towards periphery after, be heated once again.Under conventional complete set of equipments situation, between this period of heating, steel billet along along big distance and thereby be exposed to for a long time under the normal outside atmosphere, so oxide skin forms again from the teeth outwards, under these conditions, this oxide skin is thin and tough and tensile one deck, and in fact this oxide skin can not be removed fully with very high hydraulic pressure, and finally must could remove by pickling.

Furnace apparatus can only be used to make the temperature of steel billet even, or to can be used to be the temperature that changes the base heart at least.

In the complete set of equipments that is equipped with like this, even steel billet passes long furnace apparatus, also being prevented from it can contact with the atmosphere of outside, thereby the oxide skin that forms on the steel billet outer surface is the least possible.

As previously mentioned, the equipment of coiling is furnished with the i.e. shield of a shell, in order to keep coiling the atmosphere that meets the requirements in the equipment.Under the situation of conventional complete set of equipments, steel billet is twisted in the equipment of coiling with higher temperature and is stored in there a period of time, so that temperature becomes evenly, or is convenient to wait remakes processing in rolling equipment.And use this complete set of equipments, when the equipment of coiling has non-oxide atmosphere, steel billet retention period in coiling equipment, just be prevented from oxidation.The equipment of coiling preferably has sealing device, and gate for example is with so that the equipment of coiling is closed the atmosphere that inlet and maintenance wherein meet the requirements when separating with furnace apparatus.

As previously mentioned, in this complete set of equipments, the outlet of furnace apparatus is actually airtightly and can combining with the equipment of coiling attachedly.So also beneficial, promptly enter in the furnace apparatus from steel billet, till it was sent the equipment of coiling, it can not contact with the air of outside, and the atmosphere that is meeted the requirements by composition surrounds constantly on the contrary.In order to accomplish this point, furnace apparatus and the atmosphere of coiling in the equipment can be identical, also can be inequality.

Coil equipment preferably movably, it can be from a position that is connecting furnace apparatus, moves to one and above-mentioned steel billet unclamped and allows it enter position in the ausrolling equipment.Can make with the time of contact of ambiance the shortest like this.

Released steel billet from coil equipment is rolled into thickness is preferably less than 1.5mm less than 1.8mm hot rolled strip in a follow-up fine finishining unit.

In order to make the fine finishining unit simple and as far as possible little as far as possible, also, preferably make the thickness of released steel billet as far as possible little in order to limit the rate of delivery of fine finishining unit.In order to coil this piece steel billet, be preferably in and be furnished with axle on the equipment of coiling, make above coiled material can be twisted in.The no matter whether roughening of the crop of steel billet all is sandwiched on the axle, is rolled in coiling equipment then at one by the coiled material in the path of axle decision.The very wide thickness of scope can be coiled in this stressed path reliablely.Like this, this part processing before coiling just has very big freedom, and can coil the thin steel billet that had rolled.

Be used for conventional complete set of equipments, comprise that some are used for the specific installation of cold attenuate and annealing the further processing of hot rolled strip.The strong cold rolling steel of mechanical performance for approaching, the once cold rolling steel band is annealed exactly for the first time, then by cold rolling, anneal to temper rolled steel, promptly so-called two cold attenuate steel (DCR).

This complete set of equipments can be made the hot rolled strip of thickness less than 1.3mm.This steel band can be reprocessed in a kind of cold-rolling equipment effectively, and this kind equipment is equipped with the first cold rolling unit, the crystallization heating furnace and the second cold rolling unit more in succession.Because the beginning material processed is the hot rolled strip that approaches, this equipment can be constructed to some continuous devices, and steel band is just handled basically continuously by these devices.So just form a kind of device of compactness, it can process the DCR steel again continuously.This DCR steel and uses thereof are known, for example the three-chip type jar of packaging industry aspect.

In order to obtain good forming property, the preferably suitable workpiece that makes by at least one mill stand of one time first cold rolling unit of the first cold rolling unit, attenuate 30%.There have been so many attenuates just to be enough to make steel in follow-up recrystallization process, to be out of shape.In addition, also can make material attenuate very sufficiently, along with after the crystallization again, also available fairly simple mill stand just is completion thickness to the steel attenuate.

With the equipment that embodiment obtained, especially compact and be easy to regulation and control, in this kind equipment, the first cold rolling unit comprises 34 roller mill supports.

With the equipment of the embodiment of the invention, also reached the satisfactory favorable forming property of attenuate, in this kind equipment, the second cold rolling unit comprises two mill stands, though with two 4 roller mill supports also can, two 6 roller mill supports preferably.

It is less than 0.14mm that the second milling train unit preferably is suitable for making the completion reduced thickness.The advantage of doing like this is, can produce the cold-rolled strip or the steel plate that have only complicated two cold rolling technology to make with substantial continuous processing.

The professional can be clear, comprises the first cold rolling unit, crystallization heating furnace and the such compact apparatus of the second cold rolling unit also can be used as autonomous device and use again, or with the equipment coupling of making the described austenite hot rolled strip of non-the application.The device of this compactness can be made the DCR steel of the little various grades of thickness for the known application packaging material that for example 0.14mm is thick or thinner.

With reference to the accompanying drawings, in order to the non-limitative example of carrying out a complete set of equipments of the present invention the present invention is described by means of explanation.

In these accompanying drawings:

Fig. 1 is a top view sketch map of carrying out a part in a set of equipment of the present invention;

Fig. 2 is the side view outline of equipment shown in Figure 1;

Fig. 3 is a side view outline of carrying out another part in that complete equipment of the present invention.

Fig. 1 shows two strands of conticasters 1 that processing line is used.Conticaster 1 comprises the ladle frame 2 that wherein can hold two ladles 3 and 4.In two ladles each can be adorned about 300 tons of molten steel.Conticaster is furnished with tundish 5, and it is injected by ladle 3 and 4 and keeps filling with.Molten steel flows out tundish and enters in two mold (not shown)s, this moment core still be liquid and steel billet that part is fixed between mold some rolls through crooked roller-way 6 and 7.Concerning the steel of some grade, steel billet reduced thickness in roller- way 6 and 7, core still is good for liquid state simultaneously.This procedure is known soft depressing.

Nozzle sets 8 is positioned at outlet one side of two roller- ways 6 and 7, and nozzle goes down oxide skin with the hydraulic pressure of about 200 crust from the steel billet upper punch.The for example about 60mm of the cast thickness that steel billet begins is through common also thick about 45mm after soft the depressing.Steel billet is one group a roll stacks 9 and 10 through 3, and it is 10 to 15mm that thickness is thinned again.If desired, can be with cutter the cutting away end to end of steel billet, or it is cut into the several sections that length is closed requirement.

If not the thin slab of cast thickness, also can cast thicker steel billet, and be the steel billet attenuate 10 to 15mm by means of the especially two-way roll of roll less than 100mm.

In the method for the invention, steel billet is rolled into thick as previously mentioned 10 to 15mm semi-finished product steel billet usually.This steel billet that rolled is admitted in furnace apparatus 13 or 14.Every furnace apparatus is furnished with the heater (not shown), and for example induction heating apparatus meets the temperature that requires in the austenitic area in order to the steel billet that rolled is heated to.Furnace apparatus is enclosed, and is furnished with adjusting device, in order to found in furnace apparatus and to keep the non-oxide atmosphere that meets the requirements.In the embodiment shown, the adjusting device of furnace apparatus comprises a suction line 15, pump 17, a gasmetry and a washer 19, and supplied gas along and be pumped into the steam line 21 of furnace apparatus.If desired, gasmetry and washer 19 also can comprise a gas heater, so that compensate any thermal losses.Therefore, available heat exchanger control gas temperature, and adopt gas combustion to come heat supply, water cools off.

The atmosphere that preferably also is equipped with in coiling equipment in furnace apparatus is non-oxide basically, though it may comprise a spot of oxygen inevitably owing to gas leakage.This atmosphere is preferably based on nitrogen, although also receptible other inert gases of available cost height for example argon also be like this.For the nitrogenize that makes steel surface is suppressed, can as in the method for steel being carried out batch annealing, in nitrogen, comprise additive.Can comprise water vapour in the atmosphere.

The inlet of furnace apparatus and outlet one side are furnished with the band sealing device and undesirably permeate the aperture 23,25 of coming in to prevent gas basically from ambient atmosphere.Attenuate steel billet, when coming out from furnace apparatus, its temperature that is fit to is 1080 ℃.Furnace apparatus combines airtightly with coiling equipment 27 in fact, and this is coiled equipment 27 and itself comprises airtight in fact shell, and steel billet is coiled rolling in this shell.The equipment of coiling preferably is furnished with the base volume that axle 29 is coiled with supporting.

In the present embodiment, institute's distribution atmosphere also enters in the equipment of coiling when the equipment of coiling is connected with heating furnace in the furnace apparatus.Interchangeable is that the two all can be furnished with aforesaid adjusting device to furnace apparatus with coiling equipment, so that the atmosphere that meets the requirements is provided.

Proportionately, when coiling steel billet on coiling equipment 27, the steel billet foundry goods on another strand processing line in fact also is furnished with the equipment of coiling 28 coilings of axle 30 (not shown)s.Coil equipment 27 and 28 and furnace apparatus 13 and 14, all is furnished with sealing device 33,35,34,36 one by one respectively, against these devices, coil equipment and furnace apparatus can not connect mutually ground sealed, thereby, connect along with breaking away from, also do not have gas and from the atmosphere of periphery, permeate, and the atmosphere of coiling in equipment and the furnace apparatus still maintains the original state.

The used sealing device of the furnace apparatus aperture and the equipment of coiling all is suitable steel discs of deflection closing position, also driven gate.Minimum for gas is leaked, can mix curtain flexibly in addition again.

Filled the steel billet of dish rolling in coiling equipment 27, this is coiled equipment 27 and just is connected with furnace apparatus 13 disengagings, and be driven from position A (see figure 1) through position B and in-position C.One distaff, 31 (not shown)s are arranged at position C place, and by means of this distaff, the equipment of coiling can be round a vertical axis Rotate 180 ° at position C place.After the rotation, the equipment of coiling is driven through a holding fix D in-position E.When the equipment of coiling when position A advances to position E, the equipment of coiling of a sky is driven into from position E in the distaff 37 at F place, position.By means of distaff 37, this is coiled equipment and is driven to such an extent that arrive original position A through position G after a vertical axis Rotate 180 °, and the existing new steel billet in there is waited and got.

The corresponding work method is applicable to second strand of processing line, thereby the equipment of coiling 28 of having filled the base volume is driven into position C from position B, in-position D after Rotate 180 °.This is coiled equipment and stops on this position, is not had the equipment of coiling of base volume, for example empty equipment of coiling 27 at position E place to be driven to leave by volume until a this moment and arrives the position F that has soared at this moment.Leave position B when coiling equipment 28, the empty equipment of coiling is just from position I, round vertical axis Rotate 180 °, moves to such an extent that go to occupy and coil that position that equipment 28 has been driven out this moment by means of a distaff 38 subsequently through position K.From the new steel billet that furnace apparatus 14 is sent, can be reeled in empty coiling in the equipment.Some devices, especially Ampereconductors (not shown) are installed along the path that the equipment of coiling is passed through, so that coil equipment and power is provided in the inside heating as required.For this purpose, the equipment of coiling is included as the used electric heater of heating base volume, and in order to pick up the contactor of power from fixing electric conductor.Path B, C, D, E be as mentioned above by on two strands of processing lines to coil equipment shared.Position C has whirligig, and position D then is a holding fix, on this position, has adorned the equipment of coiling of base volume and has waited for once shift to the there when position E soars.Position C and D are used alternatingly, and also can use simultaneously.

In a manner described, the sealing device 33 of the equipment of coiling 27 at in-position E place is closed, and its base of adorning volume temperature is about 1080 ℃.After sealing device 33 was opened, the corresponding outer ring end of afterbody with institute's coil base just was admitted to roll stacks.If desired, can be shape unaccommodated or make up to such an extent that unsuitable head cuts away with cutter because of other processing.If also produced some oxides, available high pressure nozzle 42 is removed it easily.In fact, oxidation forms thing can be ignored, because steel billet almost is in the atmosphere of regulating consistently.Owing to coil equipment Rotate 180 °, feeding place that it is original, be can be sent this moment going out very close to the roll stacks inlet to having located.This also can make oxide form and reduce to minimum.

In the example shown, roll stacks 40 is equipped with 4 mill stands, and design can make steel billet be rolled in the austenitic area like this, or only has sub-fraction to be converted to ferrite under such temperature at least.The minimum target temperature that is about 820 ℃ is applicable to mild steel.In order to regulate and control thickness, width and temperature, after mill stand or between, can load onto for roll stacks and measure and regulation device 43.

As mentioned above, this equipment can reach when steel billet and steel band are processed, the effect that the less formation of oxide is such.For this cause, and owing to enter slow another advantage like this of speed in last roll stacks 40, compared with the completion thickness of the hot-strip of routine, thickness is less.After handling by roll stacks 40 with equipment described herein, can reach the thickness that makes out is 1.0mm or littler.

Hot rolled strip passes cooling pipe 44 after roll stacks 40 is come out, steel band is cooled into the temperature of closing requirement in the Tie Su district by means of water-cooled in pipeline.Steel band is coiled rolling coiling on the equipment 45 at last.By on cooling pipe, selecting cooling, influence crystallization again in the Tie Su district with regard to available known in fact mode, thereby influence the mechanical performance of hot rolled strip.

In addition, use equipment shown in Figure 1 in this way, just can utilize the casting heat, make with a series of continuous process segments and be suitable for the following stated reprocessing and the ausrolling steel band of usefulness.Outer heat after the casting can be avoided (except any heat of rolling generation).

From coiling equipment 45, or directly from cooling pipe 44, or adopting another kind of temporary transient banking system, hot rolled strip is processed in cold-rolling equipment shown in Figure 3 once again.

Fig. 3 has shown a pickling line 5, and steel band 49 is directed to roller 51,52,53,54 guiding and passes this lines, so that with any issuable oxide removal.After steel band had gone out pickling line, through first attenuate stage, this cold roll group comprised 34 roller mill supports 56,57,58 in the first cold roll group 55.In the middle of of these mill stands, the attenuate of thickness is at least 30%.Then, steel band quilt crystallization again by the temperature that meets the requirements in the heating furnace of crystallization again 60 of operation continuously.For compactness is installed, the crystallization heating furnace builds up vertical heating furnace again.Steel band is directed to roller 61,62,63,64 and sends into and send this heating furnace.Steel band has gone out heating furnace and can cool off in cooling device 65.Round guide roller deflection after the direction, steel band is admitted to the second cold roll group 67 thickness thinning more again, this cold roll group comprises 26 roller mill supports 68 and 69.After this, steel band is reeled in coiling equipment 70, or the known type cutting equipment that is not shown is cut into a section steel band that length is closed requirement.If desired, before reeling or cutting, also can give steel band coating.

The exemplary value of thickness of strips is: be about 1.0mm when entering first roll stacks, be about 0.2mm when going out first roll stacks, be about 0.12mm when going out second roll stacks.So just make attenuate 88% in ferrite area.As previously mentioned, even attenuate be no more than 87% be no more than 85% best so that reduce " going out lug ", and obviously feasible to this equipment.

Claims (10)

1. method of making steel band or steel plate, this steel band or steel plate are suitable for being used as with deep-draw and deep-drawing method and make the used deep-draw steel of cylinder of steel, and the step of this method is:

(ⅰ) liquid mild steel is made the plate slab of thickness less than 100mm by means of conticaster;

(ⅱ) utilize the casting heat, make its reduced thickness for transmitting thickness at the austenitic area rolled slab;

(ⅲ) (ⅱ) gained set by step being had the slab that transmits thickness cools off into ferrite area;

(ⅳ) slab rolling that (ⅲ) gained was set by step rolled at ferrite area becomes completion thickness,

The method is characterised in that: above-mentioned transmission thickness is less than 1.5mm, is this transmission reduced thickness that total thickness decrement of above-mentioned completion thickness is less than 90% and greater than 75% at ferrite area.

2. method according to claim 1 is characterized in that: in above-mentioned total thickness decrement of ferrite area less than 87%.

3. method according to claim 1 and 2 is characterized in that: the rolling in above-mentioned steps (ⅳ), at least a portion are cold rolling.

4. method according to claim 3 is characterized in that: in above-mentioned steps (ⅳ), the steel that are rolled continue to pass through the first cold rolling unit, the crystallization heating furnace and the second cold rolling unit again.

5. method according to claim 4 is characterized in that: the above-mentioned first cold rolling unit comprises that at least one makes the workpiece mill stand of reduced thickness 30% at least just by once.

6. according to claim 4 or 5 described methods, it is characterized in that: the above-mentioned second cold rolling unit, can make above-mentioned completion reduced thickness is less than 0.14mm.

7. method according to claim 1, it is characterized in that: above-mentioned steps (ⅱ) comprises this slab is rolled into the semi-finished product slab in the austenitic area, this semi-finished product slab is coiled in coiling equipment, this semi-finished product slab is arranged in the above-mentioned heating furnace before coiling operation and coiling equipment at least one stands the temperature homogenisation effect, and coil after equipment unclamps from above-mentioned at this semi-finished product slab, it is rolled into above-mentioned transmission thickness in the austenitic area.

8. method according to claim 7 is characterized in that: the thickness range of above-mentioned semi-finished product slab is 5 to 25mm.

9. method according to claim 1 is characterized in that: above-mentioned slab a period of time at least in the austenitic area is to remain in a kind of non-oxide atmosphere.

10. according to claim 7 or 8 described methods, it is characterized in that: when having above-mentioned half product, non-oxide atmosphere remains at least one above-mentioned heating furnace and above-mentioned coiling in the equipment.

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