Method of coating on steel strip and steel strip (versions)
SUBSTANCE: invention relates to method of coating on steel strip. Steel strip allows following composition, wt % C≤1.6, Mn 6-30, Al≤10, Ni≤10, Cr≤10, Si≤8, Cu≤3, Nb≤0.6, Ti≤0.3, V≤0.3, P≤0.1, B≤0.01, N≤1.0, iron and unavoidable admixtures - the rest. Primarily on steel strip it is applied aluminium layer, then it is implemented annealing, in process of which it is formed interlayer, consisting, mainly, from aluminium and iron, and it is coated molten metal, consisting of Al/Si-alloy, aluminium, zinc or zinc alloy.
EFFECT: obtaining steel strips with metallic coating, allowing high corrosion stability and well welding characteristics.
10 cl, 4 dwg
The invention relates to a method of coating a steel strip containing (in wt.%) With≤1,6, Mn 6-30, Al≤10, Ni≤10, Cr≤10, Si≤8, Cu≤3, Nb≤0,6, Ti≤0,3, V≤0,3, P≤0.1 And≤0,01, N≤1,0, rest iron and unavoidable impurities, wherein the steel strip is subjected to final annealing, and then provided with a coating formed flowable metal. In addition, the invention relates to a steel strip (options) containing the basic material of appropriate composition and the applied metal coating. Depending on the required coating properties, it is thus, in particular, of aluminum/silicon alloy, pure aluminum, pure zinc or zinc alloy.
Steel with high content of manganese due to its favorable combination of properties of high strength up to 1400 MPa, on the one hand, and extremely high elongation uniform elongation up to 70% and the elongation up to 90%), on the other hand, in principle, are particularly suitable for use in the manufacture of vehicles, in particular in the automotive industry. Especially suitable for this purpose steel with high manganese content 7-30 wt.% known, for example, from DE 10259230 A1, DE 19727759 C2 or DE 19900199 A1. Made from these steels flat products have high strength isotropic deformation behavior and also what about the, have viscosity at low temperatures.
This advantage is counteracted, however, that a steel with a higher content of manganese is prone to pitting corrosion and passivated only with difficulty. This is high compared to the more low-alloy steels when exposed to elevated concentrations of chloride ions tendency to locally limited, but intense corrosion make it difficult to use steels that are related to the material group of high-alloyed steel sheet. Besides steel with high manganese content are prone to surface corrosion, which also limits the range of their application.
Therefore, it was proposed to provide flat products made of steels with high manganese content, is known in itself by way of a metal coating that protects the steel from corrosion. For this purpose, attempts have been made to be applied on the steel by electrolytic zinc coating. These efforts led, however, to the zinc coated strip, the base material which may consist of high-alloy steel, protected against corrosion by applied metal coating. However, it appeared that the welding of such sheets having problems in the area of the weld zone, known among specialists, the term "solder fragility". Sredstv the e weld in the base material is infiltration of grain boundaries through the liquid zinc coating. As a result of infiltration of the metal around the weld zone loses its strength and viscosity to such an extent that the welded joint or generally adjacent the welded joint sheet is no longer responsible brought to nagruzhaemoi requirements.
Attempts to obtain sufficient corrosion resistance and at the same time well-welded sheet by known methods of coating by immersion in the melt were unsuccessful because of high-alloyed steel strip, in particular with a manganese content of more than 6 wt.%, when the inevitable for the effectiveness of the coating by immersion in a melt annealing prone to strong surface oxidation. Corroded thus the surface of the sheet can no longer be wetted by the metal coating with the desired uniformity and completeness, so the aim of covering the surface corrosion protection in this way cannot be achieved.
Known from the field of high-alloyed steels with lower, however, manganese opportunities to improve wettability by applying an intermediate layer of Fe or Ni has not led from sheet steel with a manganese content of at least 6 wt.% to the desired success.
Based on the above-described prior art, the object of the invention is to create a method that would provide providing the high corrosion resistance and good welding properties of metallic coating even such steel strip, still managed to cover just enough. In addition, there should be created coated steel strip, well weldable without danger soldering fragility.
In part of the way this problem is solved due to the fact that in the coating on the steel strip containing (in wt.%) With≤1,6, Mn 6-30, Al≤10, Ni≤10, Cr≤10, Si≤8, Cu≤3, Nb≤0,6, Ti≤0,3, V≤0,3, P≤0.1 And≤0,01, N≤1,0, iron and inevitable impurities-the rest, including the application of the aluminum layer on the steel strip and annealing, in which is formed an intermediate layer consisting mainly of aluminum and iron, and the subsequent application of molten metal consisting of Al/Si alloy, aluminum, zinc or zinc alloy.
According to the invention, before the application actually forming a corrosion-protective layer coating to form a core material of the steel strip is applied to a thin aluminum layer.
When necessarily prior to the subsequent deposition of the melt annealing occurs diffusion of iron steel strip in applied according to the invention, the aluminum, so in the process of annealing steel strip there is a metal composed mainly of Al and Fe floor, which is connected with the material of the closure forming a steel strip substrate. Coupled with a steel strip of aluminum prevents oxidation of the surface is ti steel strip when the previous application of the melt annealing of the latter. In addition, the aluminum layer-type adhesion promoter is that formed by applying a molten coating bonded with steel band firmly on the entire surface even when the steel strip due to its alloy creates an unfavorable role in this regard.
Unexpectedly turned out to be that applied, according to the invention, between the steel strip and the aluminum coating layer, in addition to the aforementioned effects, has the advantage that the welding is covered, according to the invention, sheets he counteracts the disturbing in the prior art soldering fragility. Thus, the aluminum layer in combination with the applied then coating prevents the penetration of the material of the metal coating during welding in the steel structure that would adversely affect its strength or viscosity. Steps for coating steel strip allow you to provide metal protection from corrosion covering layer even such steel strips which are coated by known methods only is not enough.
Application of aluminum intermediate layer is preferably a known PVD method (Physical Vapor Deposition), in which aluminum is evaporated and the resulting aluminum vapor condenses in the vacuum on the coated steel strip, so that the aluminum OS is by it in the form of a thin layer. The thickness of the coating on steel strip aluminium intermediate layer can be adjusted due to the number of aluminum vapor.
The method according to the invention, suitable equally for coating steel strip in a hot - or cold-rolled condition.
Sufficient step coverage, according to the invention, is always guaranteed in that case, if the thickness of the aluminum intermediate layer is 50-1000 nm.
The method is suitable in particular for coating alloyed steel strip to provide high strength and good expansion properties. In accordance with this, the above problem can be solved in a steel strip with a metallic coating having the following composition (in wt.%): With≤1,00, Mn 20,0-30,0, Al≤0,5, Si≤0,5,≤0,01, Ni≤3,0, Cr≤10,0, Cu≤3,0, N<0,6, Nb<0,3, Ti<0.3, and V<0.3, and P<0,1, iron and inevitable impurities - rest, in which between the base and the metal coating from the melt of Al/Si alloy, aluminum, zinc or zinc alloy is formed intermediate layer, comprising, mostly of aluminum and iron.
Received thus coated flat rolled steel has optimized corrosion resistance, while at the same time a good propensity for welding.
When this is achieved thanks to the invention effects especially reliably occur when the thickness temporarily the CSOs layer is 50-1000 nm.
Especially preferably achieved by the invention of the effects seen in the coverage of high-alloyed steel strips with a manganese content of at least 6 wt.%. So, it turned out that the steel core material containing (in wt.%) With≤1,00, Mn 20,0-30,0, Al≤0,5, Si≤0,5,≤0,01, Ni≤3,0, Cr≤10,0, Cu≤3,0, N<0,6, Nb<0,3, Ti<0.3, and V<0.3, and P<0.1, the rest iron and unavoidable impurities, particularly well covered to protect from corrosion coating, if it is pre-supplied, according to the invention, the aluminum intermediate layer. The same applies if as a main material is steel containing (in wt.%) With≤1,00, Mn 7,00-30,00, Al 1,00-10,00, Si>2,50-8,00 (and the sum of the contents of A1 and Si>3,50-12,00)≤0,01, Ni<8,00, Cu<3,00, N<0,60, Nb<0,30, Ti<0,30, V<0,30; P<0,01, rest iron and unavoidable impurities.
For such steel strip with a high content of manganese invention showed the way to protect these steel strips economical manner from corrosion so that they can be used for the manufacture of bodies in the manufacture of vehicles, in particular in the automotive industry, which in practical use are exposed to particularly corrosive environments.
As with traditional coating by immersion in the melt, by the way, according to the invention, can be coated cold - rolled, the steel strip.
In particular, if the method according to the invention should be covered by steel strips with a high content of manganese, it turned out to be favorable, if the temperature is carried out after application of the intermediate layer annealing is 680°C.-900°C. In this temperature range is particularly well is the desired diffusion of iron steel strip with pre-applied coating, so as reliably ensures the adhesion of the coating material circuit formed steel strip main layer. This is especially beneficial if the intermediate layer is applied by a PVD method.
Type known coating by immersion in the melt should be continuously annealing covered way, according to the invention, the steel strip. Device for annealing may be part of a known installation for coating by immersion in a melt.
Annealing is carried out preferably in an atmosphere of protective gas, to reduce to a minimum the danger of oxidation.
Depending on the available equipment and the selected temperature annealing duration conducted after application of the intermediate layer annealing should be 30-250, in order to achieve the desired degree of diffusion of iron steel strip in the intermediate layer by the PVD method.
In relation corrosi the authorized protection and weldability way according to the invention, particularly preferably manifests itself when the layer of molten metal deposited on the aluminum intermediate layer is formed of Al/Si alloy, pure Al, pure zinc and/or zinc alloy.
Another extra grip aluminum intermediate layer with a steel band variant embodiment of the invention differs in that before applying the aluminum intermediate layer prior to the annealing, the steel strip is cleaned.
After coating by immersion in a melt can in a known manner to conduct training to optimize surface quality and roughness of the coated strip.
Below the invention is explained in more detail by the example of its implementation with the help of the drawings, which schematically and fragmentarily depicted:
- figure 1: covered by the method according to the invention the steel strip in the slit;
- figure 2: coated steel strip of figure 1 top view;
- figure 3: coated steel strip of figure 1 on a Piece of test steel and cast iron SEP 1931 top view;
- figure 4: covered in traditional way by immersion in a molten sample of the steel strip top view.
High tensile steels containing as essential in relation to its properties of elements, in addition to iron and unavoidable impurities (wt.%) 20 Mn, 2,7 Al and 2.7 Si, was cast into ingots, the traditional is mainly finally rolled into hot rolled strip, and then wound. The obtained hot-rolled strip had a tensile strength Rm720 MPa and elongation A80 60%.
The obtained hot-rolled strip was then subjected to the first stage cold rolling at a cold-rolled strip with a degree of deformation of 30%. Followed by intermediate annealing the cold rolled strip, held at 900°C. After the intermediate annealing of the obtained steel strip S in the next step, was subjected to cold rolling to final thickness with deformation rate of 40%.
After cold rolling, the surface of the cold rolled strip was cleaned by wet chemical cleaning before she entered the installation for coating by PVD method.
The apparatus for coating using PVD on steel strip S has been deposited aluminum layer thickness of 0.5 μm due to the fact that aluminium-containing vapor was sent in vacuum on the surface of the steel strip S and besieged there.
After coating on a strip of aluminum layer using PVD she was subjected in passing annealing furnace annealing at 800°C with a residence time in her 60 seconds in a protective gas atmosphere consisting of 5% H2rest N2. In passing annealing furnace and is still in a protective gas atmosphere after this first phase of annealing was cooled to a temperature of 660°C, with a cat is Roy steel strip S has entered into the melt, formed aluminum-silicon alloy.
In the process of annealing iron steel material of the steel strip S has diffundiruet in applied to its surface by the method of PVD aluminum layer, resulting in a composed mainly of Al and Fe AlFe-layer, which was connected with the financial closure with steel strip S and is strongly linked with him (figure 1).
The bath melt bearing AlFe-layer steel strip S was covered AlSi-layer. Due to the coating process by immersion in a melt diffusion processes thus formed intermediate AlFeSi-layer consisting mainly of Al, Fe and Si. The thickness of this intermediate AlFeSi-layer greater than the thickness linked directly with the surface of the steel strip S AlFe-layer, however, considerably less than the thickness of the outer, consisting mainly of A1 and Si AlSi layer (figure 1).
After extracting covered so steel strip S from the bath to melt the coating thickness was adjusted in a known manner through a system blow off nozzles. Then coated steel strip S was cooled and subjected to rolling to optimize the nature of its surface. The obtained coated steel strip S was then Promishlena and wound in a ready to ship roll.
Figure 2 top view depicts a fragment of the steel strip, coated explained above education is. Clearly visible dense on the whole surface and uniform coating.
Figure 3 shows the result on a steel strip S sclerotomies tests. He confirms good adhesion to the steel strip S coating structure formed AlFe-, AlFeSi and AlSi layers. Not visible peeling or comparable damage.
In contrast, figure 4 for comparison with the top view depicted steel V band, alloy exactly the same as the steel strip S. except For the step of coating using PVD, she was treated in the same way as steel strip S. thus figure 4 is noticeable, however, that steel V band at the end of the process has almost no cover.
1. Method of coating a steel strip having the following composition, wt.%: With≤1,6, MP 6-30, Al≤10, Ni≤10, Cr≤10, Si≤8, Cu≤3, Nb≤0,6, Ti≤0,3, V≤0,3, P≤0,1, B≤0,01, N≤1,0, iron and inevitable impurities - the rest, including the application of the aluminum layer on the steel strip and annealing, in which is formed an intermediate layer consisting mainly of aluminum and iron, and the subsequent application of molten metal consisting of Al/Si alloy, aluminum, zinc or zinc alloy.
2. The method according to claim 1, wherein the annealing is carried out at a temperature of 680-900°C.
3. The method according to claim 1 or 2, in which an aluminum layer is applied tolmiei-1000 nm.
4. The method according to claim 1 or 2, in which the annealing is conducted 30-250 C.
5. The method according to claim 1 or 2, wherein the applying is performed by immersion in the melt.
6. The method according to claim 1 or 2, wherein before applying the aluminum layer prior to annealing, the steel strip is cleaned.
7. The method according to claim 1 or 2, in which an aluminum layer is applied by a PVD method.
8. Steel strip with a metallic coating having the following composition, wt.%: With≤1,00, Mn 20,0-30,0, Al≤0,5, Si≤0,5,≤0,01, Ni≤3,0, Cr≤10,0, Cu≤3,0, N<0,6, Nb<0,3, Ti<0.3, and V<0.3, and P<0,1, iron and inevitable impurities - rest, in which between the base and the metal coating from the melt of Al/Si alloy, aluminum, zinc or zinc alloy is formed intermediate layer, comprising, mostly of aluminum and iron.
9. The strip of claim 8, wherein the intermediate layer has a thickness of 50-1000 nm.
10. Steel strip with a metallic coating having the following composition, in wt.%: With≤1,00, Mn Of 7.0-30,0, Al 1,00-10,00, Si>is 2.50-8.00 per the content of Al+Si>3,50-12,00,<0,01, Ni<8,0, Cu<3,0 N<0,60, Nb<0,30, Ti<0,30, V<0,30, P<0,01, iron and inevitable impurities - rest, in which between the base and the metal coating from the melt of Al/Si alloy, aluminum, zinc or zinc alloy, is formed an intermediate layer consisting mainly of aluminum and iron.
SUBSTANCE: invention concerns method of operating layers receiving on surfaces of hollow barrels and can be used for bimetallic sleeves manufacturing with coating simultaneously on internal and external surfaces or only on external surface, and also for such details recovery. In detail wall there are implemented radial canals, then sintered batch is placed in its chamber. Detail is implemented lengthwise less than matrix length and installed with specified radial clearance into matrix by means of end cover with forming of end air clearances. Assembly is rotated about axis with simultaneous heating till mixture melting temperature. In covers there is implemented at least one hole connecting matrix chamber to atmosphere on radius equal to difference between external detail surface and hole. Heating is ended as only from hole it is start splash of melted metal.
EFFECT: covering refining at the expense of probable air inclusion formation in working layer of weld removal and discard is eliminated.
FIELD: electron-beam surfacing of flat and cylindrical surfaces, possibly manufacture of new parts and restoration of worn surfaces of parts operating at condition of intensified abrasive wear in combination with impact loads.
SUBSTANCE: in order to enlarge manufacturing possibilities of method, on surface of welded-on article melting zone by means of electron beam is created. Powder composition material for surfacing is fed to melting zone. Surfaced article is moved and powder material for surfacing is fed normally relative to motion direction of article. As coating is applied unfocused electron beam is used for acting upon surface of said coating without supply of material for surfacing. It provides separation of dispersed particles of strengthener from solid solution and formation of multimodal structure of surfacing along its whole thickness.
EFFECT: enlarged manufacturing possibilities of method.
1 dwg, 1 ex
FIELD: method of application of metal coats on detachable contact connectors.
SUBSTANCE: proposed method is used for stabilization of contact resistance of connectors at level of initial assembly during entire period of operation in parts made from copper, aluminum and their alloys during assembly, operation and repair of electrical plants and plants manufacturing electrical equipment. Proposed method includes cleaning and degreasing the contact surfaces, applying liquid flux on these surfaces, preheating the surfaces and applying the metal coat; preheating is continued to temperature of 40-45C; metal coat is applied by means of local contact fusion and gallium alloy having melting point not above 30C is applied as metal coat at thickness not exceeding 0.1 mm.
EFFECT: reduction of contact resistance.
6 cl, 1 dwg
FIELD: foundry, centrifugal casting in particular; manufacture of multi-layer vessels, pipe lines, bottles, connecting parts and other articles.
SUBSTANCE: proposed method includes placing the thermit mixture in cavities of article, followed by rotation, initiating of exothermic reaction, melting of thermit mixture, cooling of external surface of article and crystallization of molten thermit mixture. Thermit mixture contains additionally fluid material. Cooling of external surface of article is continued till temperature of its internal surface gets equal to melting point of metal of article.
EFFECT: reduced thickness of coat; improved control of heat removal.
FIELD: many branches of industry; methods of fritting and polymerization in the furnace of the powder coatings.
SUBSTANCE: the invention is pertaining to the method of heating and fritting of the polymeric powder coatings applied on articles and may be used in many branches of industry for painting articles of the various configurations. The method includes: charging by batches of the articles in the furnace, heating with realization of polymerization of their powdery coatings and refrigeration. Before the heating operation in the working space of the furnace create rarefaction by means of preliminary switching on the ventilation and circulation system. After the heating up to the preset temperature conduct the periodical switching-on / switching-off of the electric heater of the furnace. At that the blowout of the air from the furnace is conducted. For keeping the preset temperature over the whole operational volume of the furnace through at least one pilot hole in the furnace the portions of the cold air are periodically pumped in. Then conduct refrigeration, at which the electric heater is finally switched off, and the air saturated with the products of polymerization is removed from the furnace, create the rarefaction and feed the new batch of the cold air into the furnace. For realization of the heating they use the electric heater made out of the steel sheets and the square-shaped metallic tubes. The tubes have holes used for arrangement in them of the tubular rods supporting the spirals. The tubular rods supporting the spirals of the electric heater are made out of the mullitesiliceous ceramics. The technical result of the invention is improvement of the quality of the articles treated in the furnace with simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.
EFFECT: the invention ensures improvement of the quality of the articles treated in the furnace at simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.
8 cl, 3 dwg, 1 ex
FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.
SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.
EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.
14 cl, 6 dwg, 3 ex
FIELD: mechanical engineering, restoration of machine parts.
SUBSTANCE: method is realized by applying at least one coating by means of electric spark alloying. Wear resistance coating is applied with use of electrode of boron alloyed intermetallide Ni3Al containing, mass %: Al, 2 - 15; B, 0.02 - 02; Ni, the balance. In variants of invention electrode contains in addition dispersed particles of Si3 N4. Before applying on part layer of wear resistant coating, nickel layer with thickness 20 - 50 micrometers is applied as intermediate adhesion barrier. Coated parts are subjected to mechanical working. Restoration is realized for parts with wear degree up to 100 micrometers or with wear degree 100 - 300 micrometers.
EFFECT: possibility for restoring parts, improving their wear resistance and increasing adhesion strength of applied coating with base material of part.
6 cl, 3 tbl, 3 ex
SUBSTANCE: metal strip is supplied through furnace and roller chamber to capacity with melt via opening in bottom zone of capacity around which there is created electromagnetic field to maintain melt in capacity. Different gas atmospheres are kept in the roller chamber in at least two separated from one another sections. Gas atmosphere in a successive in the direction of strip motion section of the roller chamber has lower share of hydrogen, than in the section of the roller chamber preceding the above said section; also the first in the direction of strip motion section of the roller chamber has gas atmosphere with share of hydrogen exceeding 5 vol.%, while the last in the direction of metal strip motion section of the roller chamber has gas atmosphere with share of hydrogen lower, than 5 vol.%. The installation for implementation of the method consists of a furnace, of the roller chamber adjacent to the furnace in the direction of metal strip motion, and of the capacity with melt; also there is the opening in the bottom zone of the capacity; the opening is intended to supply the strip to the capacity; further, the capacity consists of an electromagnetic inductor to hold melt in the capacity. At least one partition is located in the roller chamber; the partition separates at least two sections; in addition, each section of the roller chamber has at least one gas supply line for supplying gas of specific kind or composition into the section.
EFFECT: invention facilitates maintaining favorable gas composition in installation even at irregularity of process.
11 cl, 3 dwg
SUBSTANCE: invention concerns field of immersion plating into melt. Metallic strip is vertically passed through tank with melt and through located in front of it guide channel, in area of which it is created electromagnetic field by means of two field magnets located from both sides of product for keeping of melt in tanks for strip stabilisation in midposition in guide channel. Electromagnetic excitation of field magnets is changed and/or by means of two located from both sides of strip correcting coil it is created electromagnetic field, overlaid on electromagnetic field of inductors, at that for strip stabilisation in midposition it is measured actuating force in horizontal line, rendered by strip on force sensing element at declination from midposition and depending on measured force is operated on inductive current in field magnets and/or on inductive current in correcting coil. Facility contains tank with melt, located in front of tank guide channel, in area of which from both sides of strip there are provided field magnets for creating of electromagnetic field, and measurement element of actuating force in horizontal line, rendered by strip on force sensing element at declination from midposition in guide channel, and also regulating facilities, which are appropriate for control of inductive current at least in one inductor depending on measured force.
EFFECT: effectiveness increasing of regulation, what provides strip keeping in the middle in guide channel.
10 cl, 1 dwg
SUBSTANCE: metal blank is vertically passed through tank with melt and through located before tank guiding channel of specified height. In the area of guiding channel there are provided two located by both sides of inductor blank, creating electromagnetic field. Into guiding channel in the area of its extent by height it is fed melt with specified volume flow, which corresponds to part or all additional melt volume, fed at time unit, for supporting of wished melt level in tank. Facility contains tank with melt and located before the tank guiding channel, in the area of which by both sides of blank there are provided inductors for creation electromagnetic field, and into area of extent by height of this channel it is provided, at least, one pipeline for feeding of melt with specified volume flow, at that pipeline, coming into guiding channel is provided in the area of long side and in the area of butt end side of guiding channel. Quality of coating plating is increased at the expense of tank with melt which stay immovable at usage of electromagnetic lock.
EFFECT: increasing of coating quality.
6 cl, 2 dwg,1 ex
FIELD: technological processes.
SUBSTANCE: metallic workpiece is led vertically through reservoir with melt and through upstream guiding channel with at least two inductors installed on both sides from it for creation of electromagnet field that holds melt. According to invention it is provided that distance between walls, which limit guiding channel, in direction of normal to the surface of metallic workpiece in the area of guiding channel length by height is made as variable between its bottom side and reservoir bottom, at that walls that limit guiding channel have narrowing or expansion.
EFFECT: melt quieting.
8 cl, 3 dwg
FIELD: building industry; metallurgy industry; methods and the devices for the product coating by its immersing into the melt.
SUBSTANCE: the invention is pertaining to the method and the device for coating on the surface of the strip made out of the non-ferrous metals or the steel strip of the metallic coating. The method provides for the strip passing through reservoir with the melt, at that the melt is introduced from the receiving reservoir into the gap between the rotors rotating in the opposite directions, and the strip is passing top-down through the melt and between the rotors. At that the gap from its lower side is hermetically sealed by means of the spinning permanent magnets fixed on the lateral side of the spinning rollers, which are located inside the rotors. The device includes the reservoir containing the melt which is formed by the upper and middle space between the two rotors rotating in the opposite directions with the gap hermetically sealed in the lower part by means of the rotating permanent magnets fixed on the lateral surface of the rotating rollers, which are located inside of the rotors. The technical result of the invention is: the good opportunity to coat the product by its immersing into the melt without the refrigerating column, the combination of the minimally possible volume of the construction with the optimal investment input and the high efficiency at the high quality of the products.
EFFECT: the invention ensures the good opportunity to coat the product by its immersing into the melt without the refrigerating column, the combination of the minimally possible volume of the construction with the optimal investment input and the high efficiency at the high quality of the products.
9 cl, 5 dwg
FIELD: metallurgy; production of installations of dual-purpose assignment.
SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to production of installations of dual-purpose assignment. The installation of dual-purpose assignment for a continuous annealing of a steel item and application of a coating on the steel item by its dipping into a hot bath contains: at least a furnace of a continuous annealing, a bath with a coating material, an equipment for the coating application, an alloying furnace, a unit of chilling and equipment of chilling by water - all placed in the form of a processing line along direction of the steel items movement. The installation also contains a by-passing way for withdrawal of the steel items from the furnace of a continuum annealing directly into the equipment of chilling by water without an exterior aerosphere action on it. The internal space of the by-passing way is filled by a not oxidizing aerosphere containing 5 - 10%of H2 and 95-90% of N2. The invention allows to prevent a possibility of oxidizing of the steel item heated up to the high temperature.
EFFECT: the invention ensures prevention of a possibility of oxidizing of the steel item heated up to the high temperature.
2 cl, 1 dwg
FIELD: metallurgy, namely continuous application of coating onto rolled strip by dipping it in melt metal, possibly in aggregates for continuous hot zinc plating.
SUBSTANCE: installation includes arranged according to manufacturing process heat insulation box with inclined duct; guiding member in the form of pair of rollers; bath with melt; fluidic device; pair of discharging rollers arranged with possibility of vertical motion in zone between fluidic device and tensioning rollers. Pair of discharging rollers and roller pair of guiding member are mounted with possibility of motion along their axes; barrels of their rollers have sections that may be rotated separately. Generatrix of boundary sections of barrel of one roller of roller pairs is concave and generatrix of boundary sections of barrel of other roller of roller pairs is convex. Radius of concave and convex generatrices is no less than 0.004 α Lb, where α - inclination angle relative to horizon of line being tangent to lateral edge of barrel, Lb - length of roller barrel.
EFFECT: enhanced quality of coating due to stability of strip at applying coating provided by normalized elastic bending of lateral portions of strip.
4 cl, 2 dwg
SUBSTANCE: invention elates to field of dip application into melt. Steel sheet with aluminium coat, applied by method of hot dip, contains steel sheet of basis and application layer, herewith coating layer contains striped interlayer, containing intermetallic compound chrome-aluminium in its section. Coating layer contains from 8 up to 15 wt % Si, from 0.26 up to 1.50 wt % Cr, from 0.50 up to 1.50 wt % Mg, and the rest is Al, in which intermetallic compound chrome-aluminium contains Cr2Al13 and Cr2Al84. Manufacturing method of steel sheet with aluminium coat includes submersion of steel sheet of basis into electrolytic tank, containing electrolytic tank composition, which contains from 8 up to 15 wt % Si, from 0.26 up to 1.50 wt % Cr, from 0.50 up to 1.50 wt % Mg and the rest is Al, and passing of steel sheet of the basis through electrolytic tank for formation of coating layer on steel sheet of the basis, herewith amount of coating material at one side of layer is from 15 up to 150 g/m2.
EFFECT: invention provides receiving of steel sheet with aluminium coat, allowing excellent corrosion resistance, thermal stability and machinability.
7 cl, 7 dwg, 2 tbl