Method of coating on steel strip and steel strip (versions)

FIELD: metallurgy.

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.



 

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