JPH0717036B2 - Panel board for steel structure exterior with excellent corrosion resistance - Google Patents

Description

TECHNICAL FIELD The present invention relates to a panel plate for exterior of a steel structure.

Ceramic products such as concrete and mortar have been mainly used for outer walls and roofs of buildings, but recently, from the viewpoint of weight reduction, simplification of construction, and ease of various designs, it is possible to use coated steel sheets and other products. The use of metal plates has become widespread.

TECHNICAL FIELD The present invention relates to a steel structure building exterior panel plate having excellent corrosion resistance as an outer wall or roof of a steel structure building such as a building.

[Prior Art] Conventionally, ceramic products such as concrete, mortar, and tiles have been mainly used for outer walls of buildings. They are inexpensive, have low thermal conductivity and excellent environmental barrier properties, have very little change over time such as corrosion and fading, have safety advantages such as fire resistance, and even on-site. It has been widely used because of its flexibility in design, such as easy change of construction (“BOUNDARY”, Vol. 4, No. 3, pages 2 to 29, No. 4).
Vol. 4, Nos. 2 to 29, Vol. 4, No. 5, 27 to 41). However, since these ceramic products generally lack strength and toughness, reinforcing materials such as reinforcing bars were required, and it was necessary to construct them as outer walls and roofs with a considerable thickness. As a result, due to the weight of the outer wall, the structural strength of the building must be increased more than necessary. This tendency becomes even more pronounced in high-rise buildings, and it has become an obstacle to structural design such as earthquake resistance, which is essential for high-rise buildings. Further, since these ceramic products are difficult to join with the steel of the structural member, there is always a risk of falling. In particular, when an organic adhesive is used, the adhesive strength is originally low and the adhesive strength is deteriorated due to aging. Therefore, a fall accident cannot be avoided, and regular maintenance is indispensable to prevent this.

On the other hand, safety problems such as metal outer walls with poor thermal barrier properties such as high thermal conductivity and easy transmission of vibrations, deterioration over time such as corrosion, low temperature strength and lack of fire resistance have been solved. However, it has high toughness and the weight per unit strength can be made extremely light, mass production at the factory is possible, construction on site can be simplified and the construction period can be shortened easily, and Since it is easy to design the surface by painting, etc., especially in the case of steel materials, it is easy to join structural members to steel, so that the use is increasing mainly on the outer walls of high-rise buildings (special features Kaisho 47
-27282, JP-A-48-50950, Shoukai-63-201133
issue). That is, problems such as thermal conductivity have been solved by combining with other materials, and fire resistance has been solved by improving the steel itself.

Further, since the metal outer wall can be bent and pressed, it is easy to form the ends and corners with a smooth curve. Therefore, it also has an advantage that an exterior member having an excellent design can be manufactured.

However, outer walls and roofs made of metal materials are unavoidably used in a wide range because they are inevitably subject to deterioration over time such as corrosion of the metal itself and discoloration of the surface coating, or uneven deterioration over time, and this may significantly impair the aesthetics of the building. Is the reality. For example, with respect to corrosion, there was no other way to deal with it except to perform heavy anticorrosion including painting or perform regular maintenance. Even so, it is difficult to completely prevent corrosion of a building, and most of the time, it is the current situation to completely replace outer walls and roofs during the life of the building. Also, with respect to the fading of the painted surface, similarly, regular maintenance had to be performed.

The use of a weather resistant steel plate (JIS-G3125) has been proposed as a material that solves these problems such as outer walls and roofs made of metal materials. However, even if a weather-resistant steel plate is used, it takes a yearly time to generate stable rust, and the appearance of rust varies depending on how rainwater is splashed and how sunlight is radiated. After all, it often spoiled the aesthetics of the building. Further, in the case of a weather-resistant steel plate, flow rust occurs, so that when other materials are used for the basic part of the building, there is a drawback that the aesthetic appearance thereof is also impaired, and thus, they are not widely used.

[Problems to be Solved by the Invention] By the way, in order to prevent corrosion of a metal outer wall or the like, use of titanium can be considered. However, titanium is not only an extremely expensive metal, but also has a fatal drawback that a reliable method for joining structural members to steel has not been developed at present. That is, steel is usually used for structural members of buildings, and welding is mainly performed to join it. The reason for this is that rivets and bolt tightening cannot be applied to parts such as outer walls where leakage of rainwater is a concern or aesthetics are required, and sunlight irradiation occurs routinely in adhesive bonding. Since it is a part, the weather resistance of the organic adhesive cannot be guaranteed from the service life of the building. However, titanium forms a very brittle intermetallic compound with iron and cannot be welded. For this reason, titanium had to be restricted because a special construction method was required for outer walls and roofs of buildings.

INDUSTRIAL APPLICABILITY The present invention provides an inexpensive metal exterior panel plate that takes advantage of the excellent corrosion resistance of titanium, does not coat the surface having poor weather resistance, and does not cause any trouble in joining the structural member to steel. It is a thing.

[Means for Solving the Problems] In many cases, the outer wall of a building is desired to have an uneven design other than a combination of flat plates in terms of design. In the case of a metal exterior panel, it is possible to create a concavo-convex shape by combining bending processes, but the overlapped parts of the bend concentrate at the corners, impairing the aesthetics and becoming a pool of rainwater, which becomes a corrosion occurrence site. There was a flaw. For this reason, in recent years, in most cases, these problems have been solved by limiting the ends and corners to smooth curved shapes. In this way, by making the corner portions have a smooth curved shape, an aesthetically pleasing shape is exhibited.

By the way, in order to obtain excellent corrosion resistance and to omit coating on the surface having poor weather resistance, it is optimal to use titanium for the outer wall and the outer side of the roof. However, titanium is expensive and, as mentioned above, cannot be joined to the structural members of the building and cannot be used as it is. Therefore, the inventors of the present invention have conceived the use of titanium clad steel in which the surface that needs to be joined to the structural member can be welded.

However, titanium clad steel sheets have rarely been manufactured or used because the cost reduction effect of changing the Ti back surface to an inexpensive steel is slightly higher than the cost for clad manufacturing. . On the other hand, the present inventors have invented a method for producing a significantly inexpensive titanium-clad thin steel sheet by appropriately selecting and using an intermediate medium contact material (JP-A-1-122677). The present invention has been made depending on the method for producing the titanium clad thin steel sheet. That is, (1) the front surface is 0: 0.15% or less, H: 0.01% or less, N: 0.04% or less, Fe: 0.2% or less and titanium containing other unavoidable impurities, and the back surface is steel and is integrally pressure-bonded, A steel structural building exterior panel plate having excellent corrosion resistance, characterized in that the steel surface and side surfaces are coated with zinc plating.

(2) The front surface is 0: 0.15% or less, H: 0.01% or less, N: 0.04% or less, Fe: 0.2% or less and titanium containing other unavoidable impurities, and the back surface is C: 0.1% or less and at least Cr. Ten
% Stainless steel containing 25% or less, a panel structure for steel structure building exterior with excellent corrosion resistance, characterized by being integrally pressure-bonded and formed.

Invented The type of steel on the back surface is not particularly limited, but in order to maintain the corrosion resistance of the back surface and side surfaces, it is necessary to apply zinc plating or use stainless steel containing at least 10% and 25% or less of Cr. is there. Especially, Ni is 6%
When the austenitic stainless steel added above is selected as the base material, not only corrosion resistance but also workability is greatly improved.

1 and 2 are schematic cross-sectional views showing the structure of a panel plate for exterior construction of a steel structure according to the present invention. In FIGS. 1 and 2, a is titanium on the surface, b and E are base materials of carbon steel and stainless steel, c is an intermediate medium contact material used for joining, and d is a Zn layer plated on the surface. Is.

By the way, the effect of the present invention is not limited to the titanium-clad thin steel sheet manufactured according to JP-A-1-122677, and no matter what kind of metal or the like exists between the titanium on the front surface and the steel on the back surface. Further, like the titanium clad steel plate manufactured without using the intermediate medium contact material, it can be enjoyed in exactly the same manner even if there is no other metal or the like.

In the present invention, the Ti component is limited in order to enable the production of a panel plate for a steel structure building exterior having excellent corrosion resistance. As a result, it has become possible to process edges and corners having smooth curved surfaces, which was impossible at all with conventional titanium clad steel plates.

The following describes the reason why the forming process became possible by limiting the Ti component of the titanium clad steel plate.

First, the titanium-clad steel sheet manufactured for thick plates is cold-rolled in the same manner as steel to form a thin plate with a thickness of 1.0 mm, and then recrystallized annealing, which is also performed for deep-drawn steel sheets, is performed. Was prototyped. However, the titanium clad steel plate manufactured by the conventionally known method using this conventional material, when subjected to square tube drawing at a tip angle of 40R, fractures with the base material of the laminated material at the corner and At the part, the Ti layer of the laminated material was broken and it was not possible to perform pressure-bonding integrally. As a result of investigating and examining the cause, it was found that Ti, which is a titanium clad steel plate for thick plates, contains a large amount of dissolved oxygen and hydrogen in order to guarantee strength, and therefore has poor workability. That is, it has been found that it is necessary to limit the amount of solid solution oxygen in Ti and reduce the amount of precipitated hydride in order to perform processing in the intended use of the present invention.

FIG. 3 shows the effect of the oxygen content in Ti on the 180 ° Ti outward bending test results of a titanium clad steel sheet having a Ti layer thickness of 100 to 120 μm and a total thickness of 1.0 mm. In the figure, the ∘ mark indicates that Ti was bent well without cracking, and the X mark indicates that cracking occurred on the Ti surface. When the oxygen content is 0.15% or less, the bending radius is 0.5 mm (t / 2) and the Ti surface bends well without cracking. Furthermore, when the oxygen content is 0.01% or less, cracking occurs even in tight bending. Turned out not. On the contrary, when the oxygen content exceeds 0.15%, the bendability deteriorates rapidly, and cracks occur not only when the bending radius is 0.5 mm (t / 2) but also when bending is 1 mm (t) 180 °.

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

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

The surface of the exterior panel is limited to titanium from the viewpoint of corrosion resistance, and the rear surface is limited to steel or galvanized steel or stainless steel from the viewpoint of weldability with a steel structure.

As shown in FIG. 3, the oxygen content contained in the surface Ti is preferably within a range in which bendability does not suddenly deteriorate, that is, within 0.15%. The lower the oxygen content, the better the workability, but the higher the cost for oxygen reduction. Therefore, in industrial production, the lower limit is naturally set according to the amount of production for use, etc., so the present invention is not limited thereto.

As shown in FIG. 4, it is desirable that the hydrogen contained in the surface Ti be in a range where sharp bendability deterioration does not occur, that is, 0.01% or less. The lower the hydrogen content, the better the workability, but the higher the cost for reducing hydrogen. Therefore, in industrial production, the lower limit is naturally set according to the amount of use, etc., and is not limited in the present invention.

If the amount of nitrogen contained in the surface Ti is 0.04% or less, the workability is not significantly affected, but if it exceeds it, TiN is precipitated and the workability is degraded, so 0.04% or less is desirable.

As the base material, carbon steel or galvanized carbon steel can be used. Further, it is conceivable to use stainless steel as the base material for the purpose of improving the corrosion resistance of the base material. In this case, if the Cr content is less than 10%, the stainless steel lacks basic corrosion resistance, so the lower limit is set, and if it exceeds 25%, the workability of the base material deteriorates, so the upper limit is set.

In the invention of the second aspect of the present invention, the C content of the steel or stainless steel on the base metal side is set to the upper limit because workability on the steel side deteriorates if the C content exceeds 0.1%.

The base material, stainless steel, contains trace amounts of Al, Ti, and Nb alone or in combination for the purpose of further improving workability, and trace amounts of Mo, Cu and relatively large amounts of Ni for the purpose of further improving corrosion resistance. It is possible to use steel added alone or in combination, and the effects of the present invention can be enjoyed in the same manner.

[Operation] In the present invention, the front surface is Ti, and the back surface is zinc-plated steel or stainless steel. As a result, rust generation on the surface was completely suppressed and maintenance of the building was unnecessary.
Further, since the back surface is made of steel, it is easy to attach the stud bolt by welding, and it is possible to attach the stud bolt to a steel structure. If stainless steel is used on the back side,
Since the corrosion resistance of the back surface and the end surface is improved, the degree of freedom of the environment on the back surface side that is allowed is increased.

Further, the exterior panel board configured in a shape having a smooth curved surface by using the material in which the trace gas component in the Ti layer and the trace component in the steel are limited is excellent in design in addition to the above-mentioned characteristics. . Further, if press processing is applied to the manufacturing method of integrally forming, mass production becomes possible, and profits can be obtained from the viewpoint of production.

[Examples] Using a titanium rud steel sheet with a thickness of 1 mm, with Ti having the chemical composition shown in Table 1 on the front surface and steel having the chemical composition shown in Table 2 on the back surface, a 600 mmφ to 750 mmφ depth of 20 mm The exterior panel board was created. In addition to this, thin steel sheets other than clad steel were added to the test as comparative materials. The shape characteristics and the corrosion resistance test results are shown in Table 3.

Each of the examples of the present invention using the titanium clad steel plate showed excellent corrosion resistance without generating rust on the surface in the corrosion resistance test. This tendency was the same for those with a crucifix in advance.

The exterior panel is made of titanium clad steel with limited O, H, N and Fe contained in the surface Ti, and is integrally formed by press working. The four corners have smooth curved surfaces without overlapping due to bending. The appearance was very beautiful.

Further, the exterior panel board made of titanium clad steel using stainless steel on the back surface and manufactured by pressing had excellent shape resistance and excellent corrosion resistance even when no surface treatment was applied to the back surface.

On the other hand, the comparative processed product coated with a thin steel plate showed the same corrosion resistance as the product of the present invention while the coating film on the surface was sound, but when the surface had a flaw, it took an extremely short time. The rusting started and the coating was peeled off by continuing the rusting.

[Advantages of the Invention] According to the present invention, not only the mounting strength of the outer wall of the building is high and safe, but also the weight of the outer wall and the roof can be reduced. Therefore, the structure of the steel structure can be simplified. As a result of further improved corrosion resistance, maintenance is no longer necessary, so industrial benefits cannot be weighed. In a high-rise building, which has been patented, regular maintenance is indispensable due to the risk of falling of exterior materials and corrosion of outer walls, but the present invention eliminates the need for maintenance from any point. The effect obtained by this is enormous not only in terms of industrial economic benefits, but also in terms of social benefits that do not appear in direct economic effects due to the elimination of maintenance work that obstructs the cityscape. Becomes

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are schematic cross-sectional views showing the construction of a panel plate for exterior construction of a steel structure according to the present invention, and FIG. 3 is a Ti test on the bending testability of a titanium clad steel plate. FIG. 4 is a diagram showing the influence of the oxygen content in the steel, and FIG. 4 is a diagram showing the influence of the hydrogen content in Ti on the bending testability of the titanium clad steel plate. a ... Titanium, b ... Carbon steel c ... Intermediate contact material, d ... Zn layer E ... Stainless steel

Front page continued (72) Inventor Takaro Kurahashi 12 Nakamachi, Muroran City, Hokkaido Inside Nippon Steel Co., Ltd. Inside the Muroran Works (72) Inventor Nobuyoshi Uno 2-3-6 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Stock company in-house (72) Inventor Yomi Shimura 1-1-1 Edamitsu, Hachimanto-ku, Kitakyushu, Fukuoka Prefecture Nippon Steel Co., Ltd. Inside Yawata Works (56) Reference JP-A-63-306031 (JP, A) JP-A-48-5624 (JP, A) JP-A-48-23661 (JP, A) JP-A-61-199513 (JP, A)

Claims (2)

[Claims] 1. The surface is 0: 0.15% or less, H: 0.01% or less, N: 0.
Corrosion resistance characterized by being composed of titanium containing 04% or less, Fe: 0.2% or less and other unavoidable impurities, the back surface being integrally pressure-bonded with steel, and the steel surface and side surfaces being coated with zinc plating. Excellent steel structure building exterior panel board. 2. The surface is 0: 0.15% or less, H: 0.01% or less, N: 0.
Titanium containing 04% or less, Fe: 0.2% or less and other unavoidable impurities, C: 0.1% or less on the back surface and at least C
A panel plate for steel structure building exterior with excellent corrosion resistance, which is composed of stainless steel containing r of 10% or more and 25% or less and is pressure-bonded integrally.