JPH0419133A - Panel board for finishing exterior of steel structure building excellent in corrosion resistance - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance of panel board by a constitution wherein integral contact bonding forming is performed under the condition that titanium is employed as front face and steel is employed as rear rave and, at the same time, the steel face and sides are plated with zinc. CONSTITUTION:The panel board concerned is constituted by performing integral contact bonding forming under the condition that titanium is employed as front face and steel is employed as rear face and, at the same time, galvanizingly covering the steel face and sides. In this case, the front face consists of pure titanium having the composition of 0.15% maximum of oxygen, 0.01% maximum of hydrogen, 0.04% maximum of nitrogen, 0.2% maximum of iron, remainder of titanium and other inevitable impurities. Said titanium front face and steel rear face are integrally contact bonded and formed and the steel face and sides are galvanigingly covered so as to constitute the panel board concerned. Or the panel board concerned may be constituted by integrally contact bonding and forming said titanium front face and rear face, which consists of stainless steel containing 0.1% maximum of carbon and 10% or more and 20% or less of chromium. Thus, panel board, by which the excellent corrosion resistance intrinsic to titanium is utilized and no bonding trouble with steel as structural member occurs, can be obtained at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry] The present invention relates to a panel plate for the exterior of a steel structure building.

Ceramic products such as concrete and mortar have been mainly used for the exterior walls and roofs of buildings, but recently coated steel sheets and other products have been used to reduce weight, simplify construction, and make it easier to create various designs. The use of metal plates has become widespread.

The present invention relates to a panel plate for the exterior of a steel structure building, such as a building, which has extremely excellent corrosion resistance and can be used as an outer wall or roof of a steel structure structure.

[Prior Art] Conventionally, ceramic products such as concrete, mortar, and tiles have been mainly used for the outer walls of buildings. These materials are inexpensive, have low thermal conductivity and excellent environmental barrier properties, are extremely resistant to changes over time such as corrosion or fading, and have safety benefits such as fire resistance. It has been widely used for reasons such as flexibility in design, such as ease of construction changes (rBOUNDARYJ, Vol. 4, No. 3, 2-2).
9, Vol. 4, No. 4, pp. 2-29, Vol. 4, No. 5, pp. 27-41). However, these ceramic products generally lack strength and toughness, so they require reinforcing materials such as reinforcing bars, or have to be constructed quite thickly as exterior walls and roofs. As a result, due to the weight of the outer walls, the structural strength of the building had to be made higher than necessary. This trend is
This problem became even more noticeable in high-rise buildings, and it became a hindrance to structural design such as earthquake resistance, which is essential for high-rise buildings. Furthermore, these ceramic products are difficult to bond with the steel of the structural members, so they always carry the risk of falling.

Particularly when using organic adhesives, the adhesive strength is low to begin with, and the adhesive strength decreases over time, making falling accidents unavoidable, and regular maintenance is essential to prevent this.

On the other hand, metal exterior walls have high thermal conductivity and are susceptible to vibrations, resulting in poor environmental insulation properties, deterioration over time such as corrosion cannot be ignored, and safety issues such as low high-temperature strength and lack of fire resistance have not been resolved. Although it has drawbacks such as not being hardened, it has high toughness and can be very light in weight per unit strength, and can be mass-produced in factories, simplifying on-site construction and shortening the construction period. Its use has been increasing, especially on the exterior walls of high-rise buildings, because it is easy to create designs on the surface by painting, etc., and especially when it is made of steel, it is easy to join with the steel of structural members. Kaisho 4
7-27282, JP-A-48-50950, Utility Model Application No. 63-201133). In other words, problems such as thermal conductivity have been solved by combining steel with other materials, and fire resistance has been solved by improving the steel itself.

Furthermore, in the case of a metal outer wall, bending, press forming, etc. are possible, so it is easy to form edges, corners, etc. into smooth curves. Therefore, it also has the advantage that it is possible to manufacture an exterior member with an excellent design.

However, external walls and roofs made of metal materials are not necessarily widely adopted because of the unavoidable deterioration or uneven change over time such as corrosion of the metal itself and fading of the surface coating, and there is a concern that the aesthetic appearance of the building will be significantly impaired. That is the reality.

For example, the only way to deal with corrosion was to perform heavy-duty corrosion protection, including painting, or to perform periodic maintenance. Even so, it is difficult to completely protect buildings from corrosion, and in most cases, the exterior walls and roofs of buildings must be completely replaced midway through their useful life. Also, regular maintenance had to be carried out to prevent fading of the painted surface.

The use of weather-resistant steel plates (JIS-63125) has been proposed as a material that solves these problems with external walls and roofs made of metal materials. However, even if weather-resistant steel plates are used, it takes years for stable rust to form, and the appearance of the rust varies depending on how rainwater falls on it and how it is exposed to sunlight, resulting in uneven changes over time. As expected, the aesthetic appearance of the building was often damaged. Furthermore, since weathering steel plates are prone to rusting, if other materials are used for the foundation of a building, it has the disadvantage of ruining its aesthetic appearance.
Again, it has not been widely used.

[Problems to be Solved by the Invention] Incidentally, in order to prevent corrosion of metal outer walls, etc., it is possible to use titanium. However, titanium is not only an extremely expensive metal, but also has the fatal drawback that no reliable method for joining it to steel in structural members has currently been developed. That is, steel is usually used for the structural members of buildings, and welding is mainly used to join them. The reason for this is that rivets and bolts are commonly used for parts such as exterior walls where rainwater leakage is a concern or where aesthetic appearance is required, and adhesive joints are often exposed to sunlight on a daily basis. This is because the weather resistance of organic adhesives cannot be guaranteed from the perspective of the building's service life. However, titanium cannot be welded because it forms a very brittle intermetallic compound with iron. For this reason, titanium had to be subject to limitations, such as requiring special construction methods when used for the exterior walls and roofs of buildings.

The present invention takes advantage of titanium's excellent corrosion resistance, and provides an inexpensive metal exterior panel board that does not require painting of surfaces with poor weather resistance, and also does not cause any problems in joining with steel of structural members. It is something.

[Means for Solving the Problems] In terms of design, it is often desirable for the outer walls of buildings to have an uneven design in addition to a combination of flat plates. In the case of metal exterior panels, it is possible to create an uneven shape by combining bending processes, but the overlapping parts of the bends are concentrated in one corner, which impairs the aesthetic appearance and becomes a place for rainwater to accumulate and cause corrosion. There were drawbacks. For this reason, these problems have recently been solved in most cases by limiting the ends and corners to a smooth curved shape. By forming a part of the corner into a smooth curved shape in this way, a shape that is aesthetically pleasing is exhibited.

By the way, in order to obtain excellent corrosion resistance and omit painting of surfaces with poor weather resistance, it is optimal to use titanium on the outside of the outer walls and roof. However, titanium is expensive and, as mentioned above, cannot be bonded to structural members of buildings, so it cannot be used as is. Therefore, the present inventors came up with the idea of using titanium clad steel, which is a steel that can be welded on the surface that needs to be joined to a structural member.

However, thin sheets of titanium clad steel have rarely been manufactured or used until now because the cost reduction effect of replacing the Ti backside with cheaper steel is small and actually outweighs the cost of producing the cladding. . In response to this, the present inventors have invented a method for manufacturing extremely inexpensive titanium clad thin steel sheets by appropriately selecting and using intermediate welding materials (Japanese Unexamined Patent Publication No. 1-122677).

The present invention was made based on this method of manufacturing a titanium clad thin steel plate. Namely, r(1) is a material for use in the exterior of steel structures with excellent corrosion resistance, characterized in that the surface is made of titanium and the back surface is integrally crimped and formed, and the surface and side surfaces of the steel are coated with zinc plating. panel board. ”
invented. The type of steel for the back surface is not particularly limited, but in order to maintain corrosion resistance on the back and side surfaces, it is necessary to use stainless steel that is galvanized or contains at least 10% to 25% Cr. be. In particular, N
If an austenitic stainless steel containing 6% or more of i is selected as the base material, not only corrosion resistance but also workability will be greatly improved.

FIG. 1 and FIG. 2 are schematic cross-sectional views showing the structure of the steel structure building exterior panel plate according to the present invention. In Figures 1 and 2, a is titanium on the surface, b and E are base materials of carbon steel and stainless steel, respectively, C is an intermediate welding material used for joining, and d is a 2N layer plated on the surface. It is.

By the way, the effects of the present invention are not limited to the titanium clad thin steel sheet manufactured based on JP-A-1-122677, but also apply to any type of metal etc. that exists between the titanium on the front surface and the steel on the back surface. Furthermore, the same benefits can be obtained even without the presence of other metals, such as titanium clad steel sheets manufactured without using intermediate bonding materials.

The invention described above makes it possible to manufacture panel plates for the exterior of steel structures with excellent corrosion resistance, but by further limiting the Ti content, smooth curved surfaces, which were previously impossible with titanium clad steel plates, can be produced. It has been found that it is possible to process parts of edges and corners that have .

First, a titanium clad steel plate manufactured for thick plates is cold-rolled in the same way as steel to make a thin plate with a thickness of 1.0 mm, and then recrystallization annealing, which is also performed on deep drawn steel plates, is performed to make the titanium clad thin. A steel plate was prototyped. However, when a titanium clad steel plate manufactured by a conventional method using this conventional material was subjected to square cylinder drawing with a tip angle of 40R, both the base material of the laminate broke at the corner, and the tip of the punch broke. In some parts, the Ti layer of the laminate was torn and could not be pressure-molded as one piece. When the cause of this was investigated, it was found that Ti in titanium clad steel plates for thick plates contains a lot of dissolved oxygen and hydrogen to ensure strength, and therefore has poor workability. That is, it has been found that in order to perform processing in the applications targeted by the present invention, it is necessary to limit the amount of dissolved oxygen in Ti and to reduce the amount of precipitated hydrides.

FIG. 3 shows the influence of the amount of oxygen contained in Ti on the 180° Ti external bending test results of a titanium clad steel plate with a Ti layer thickness of 100 to 120 μm and a total thickness of 1.0 mm. In the figure, the mark O indicates that the Ti was bent well without cracking, and the mark X indicates that a crack occurred on the Ti surface. When the oxygen content is 0.15% or less, the bending radius becomes 0.5mm.
(t/2), it was found that the Ti surface could be bent well without cracking, and furthermore, when the amount of oxygen contained was 0.01% or less, no cracking would occur even if it was closely bonded. On the other hand, if the oxygen content exceeds 0.15%, the bendability will deteriorate rapidly, and the bending radius will not only be 0.5 mm (t/2) but also 1 a + m (t).
Cracks occurred even when bent at 80°.

FIG. 4 shows a Ti layer with a thickness of 100 to 200 μva and a total oxygen content of 1.0 μva and a total oxygen content of 0.07 to 0.09%. Om
The effect of the amount of hydrogen contained in Ti on the 180° Ti external bending test results of a titanium clad steel plate of 200 m was shown. The marks in the figure are the same as in Figure 3. It was found that when the hydrogen content was 0.01% or less, the Ti surface could be bent well at 180° bending with a bending radius of 0.5 mmft/2) without cracking. However, when it exceeds 0.01%, the bendability deteriorates rapidly, and the bending radius is not only 0.5 mm (t/2) but also 1 m.
Cracking occurred even when bending m(t) by 180°.

Based on the above test results, we have invented panel plates for the exterior of steel structures that have excellent corrosion resistance and excellent workability during integral molding as the second and third inventions.

r(2) surface O: 0.15% or less, H: 0.01
% or less, N: 0.04% or less, Fe: 0.2%
A steel structure construction with excellent corrosion resistance characterized by being made of pure titanium containing the following and other unavoidable impurities and Ti, the back side of which is integrally crimped and formed, and the steel surface and side surfaces are coated with zinc plating. Panel board for the exterior of objects.

(3) Surface O: 0.15% or less, H: 0.01%
Hereinafter, pure titanium contains N: 0.04% or less, Fe: 0.2% or less, other unavoidable impurities and Ti, and the back side contains C: 0.1% or less and at least 1% of Cr.
A panel board for the exterior of a steel structure building with excellent corrosion resistance, characterized in that it is made of stainless steel containing 0% or more and 25% or less and is integrally crimped and formed. ” was invented.

Next, the limiting conditions of the present invention will be shown.

The front surface of the exterior panel board was limited to titanium from the viewpoint of corrosion resistance, and the back surface was limited to steel, galvanized steel, or stainless steel from the viewpoint of weldability with steel structural buildings.

As shown in Figure 3, the oxygen content contained in the surface Ti is within the range where the bending property does not deteriorate rapidly, that is, 0.15.
Preferably within %. The lower the oxygen content, the better the processability, but the cost for oxygen reduction also increases.

Therefore, in industrial production, the lower limit is naturally set depending on the intended use and production volume, so it is not limited in the present invention.

As shown in FIG. 4, the hydrogen contained in the surface Ti is preferably within a range that does not cause rapid deterioration of bendability, that is, 0.01% or less. The lower the hydrogen content, the better the processability, but the cost for hydrogen reduction also increases. Therefore, in industrial production, the lower limit is naturally set depending on the intended production amount, etc., and is not limited in the present invention.

When the amount of nitrogen contained in the surface Ti is 0.04% or less, there is no significant effect on workability, but when it exceeds that amount, the Ti
Since N precipitates and reduces workability, the content is preferably 0.04% or less.

Carbon steel or galvanized carbon steel can be used for the base material. Furthermore, with the aim of improving the corrosion resistance of the base material, it is conceivable to use stainless steel for the base material. In this case, if the Cr content is less than 10%, it lacks the basic corrosion resistance of stainless steel, so the lower limit is set at 25%.
The upper limit was set because the workability of the base material deteriorates if the value exceeds this value.

In the invention of Section 3 of the present invention, the C content of the steel or stainless steel on the base metal side is set at the upper limit because if it exceeds 0.1%, the workability of the mesh side will deteriorate.

The base material stainless steel is supplemented with trace amounts of AP, Ti, and Nb, singly or in combination, to further improve workability, and trace amounts of Mo, Cu, and relatively large amounts of Ni to further improve corrosion resistance. It is possible to use steel added singly or in combination, and the effects of the present invention can be enjoyed in exactly the same way.

[Function] In the present invention, the front surface is made of Ti and the back surface is made of galvanized steel or stainless steel. As a result, the occurrence of rust on the surface was completely suppressed, making the building maintenance unnecessary. In addition, since the back surface is made of steel, it is easy to attach by welding stud bolts, and this can be used to attach to steel structures. When stainless steel is used for the back surface, the corrosion resistance of the back surface and end surfaces is improved, so the degree of freedom in the allowable environment on the back surface side is increased.

In addition, the exterior panel board, which is constructed in a shape with a smooth curved surface using a material with limited trace gas components in the Ti layer and trace components in the steel, has excellent design in addition to the above-mentioned characteristics. . Furthermore, if press working is applied to the manufacturing method of integrally molding, it will be possible to produce in large quantities, and other benefits will be obtained from a production standpoint.

[Example] Using a 1 mm thick titanium clad steel plate with Ti on the surface whose chemical composition is shown in Table 1 and steel whose chemical composition is shown in Table 2 on the back side, a 600 mmφ to 750 mmφ and a depth of 2
A 0mm exterior panel board was created. In addition, a thin steel plate other than crat steel was added to the test as a comparison material. The shape characteristics and corrosion resistance test results are shown in Table 3.

All of the examples of the present invention using titanium clad steel plates showed excellent corrosion resistance without causing any rust on the surface in the corrosion resistance test. This tendency was the same even for those with cross scratches added in advance.

The exterior panel board is made of titanium clad steel with limited amounts of O, H, N, and Fe contained in the Ti on the surface, and is integrally formed by press processing.It has smooth curved surfaces at the four corners with no overlap due to bending. It was very beautiful in appearance.

Furthermore, the exterior panel board manufactured by press processing from titanium clad steel with stainless steel on the back side not only has a beautiful shape, but also has excellent corrosion resistance even without any surface treatment on the back side. .

On the other hand, a comparative processed product made of a thin steel plate and painted on the surface showed the same corrosion resistance as the inventive product as long as the surface coating was healthy, but if the surface became scratched, it would take a very short time. Rust started and continued until the paint film peeled off.

Table 1 [wt%] Table 2 [wt%] Table 3 $1 JIS-22371 conditions 0.2kH202
Evaluate the presence or absence of dew and red rust in water containing 5k NaCl 2 Thin plate of steel B (cold rolled sintered pure plate) ~0 of the material corresponds to No. in Table 1 and Table 2 [Effects of the invention] The present invention has not only made it safer and stronger to attach to the exterior walls of buildings, but also made the exterior walls and roofs lighter, making it possible to simplify the structure of steel structures and improve corrosion resistance. As a result of the significant improvement in performance, maintenance is no longer required, and the industrial benefits are immeasurable. In patents, high-rise buildings require periodic maintenance due to the risk of falling exterior materials and corrosion of exterior walls, but the present invention eliminates the need for maintenance in both respects. The effects achieved by this are not only economic benefits from an industrial perspective, but also from the perspective of social benefits that do not appear in the direct economic effects of eliminating maintenance work that obstructs the urban landscape. Become something.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional schematic diagrams showing the structure of the steel structure building exterior panel plate of the present invention, and Figure 3 shows the influence of the amount of oxygen contained in Ti on the bending testability of titanium clad steel plates. The figure shown in FIG. 4 is a diagram showing the influence of the amount of hydrogen contained in Tl on the bending testability of a titanium clad steel plate. a...Titanium b...Carbon steel C...Intermediate joint material d...Zn layer E stainless steel Figure 1a Titanium〇-Medium intermediate joint AE Stainless steel conversion 4 people 2nd Figure titanium carbon steel intermediate welding material Z, nl what

Claims (1)

[Scope of Claims] 1. A steel structure building with excellent corrosion resistance, characterized in that the front surface is made of titanium and the back surface is integrally crimped and formed, and the steel surface and side surfaces are coated with galvanization. Exterior panel board. 2 Surface O: 0.15% or less, H: 0.01% or less,
Pure titanium containing N: 0.04% or less, Fe: 0.2% or less, and other unavoidable impurities and Ti, the back side is integrally crimped with steel, and the steel surface and side surfaces are coated with zinc plating. A panel board for the exterior of steel structures with excellent corrosion resistance. 3 Surface O: 0.15% or less, H: 0.01% or less,
Pure titanium containing N: 0.04% or less, Fe: 0.2% or less and other unavoidable impurities and Ti, the back side is C: 0
．． A panel board for the exterior of a steel structure building having excellent corrosion resistance, characterized in that it is made of stainless steel containing 1% or less and at least 10% or more and 25% or less of Cr, and is integrally pressure-molded.