JPH09227996A - Resin composite type high damping steel sheet excellent in pitting resistance, corrosion resistance and resistance weldability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a resin composite type high damping steel sheet excellent in resistance weldability for improving welding operability at the time of assembling parts as well as pitting resistance and corrosion resistance and furthermore easily reducible as scraps. SOLUTION: This high damping steel sheet is obtd. by cladding two steel sheets via viscoelastic high molecular resin obtd. by dispersing the metallic grains of iron powder, nickel powder, stainless steel powder, copper powder or the like in the range of 1.0 to 10vol.% and laminating the layers of the viscoelastic high molecular resin. At least either of the steel sheet has a compsn. contg., by weight, <=0.08% C, <=2.0% Si, >0.02 to 2.5% Mn, <0.10% P, <=0.01% S, 0.003 to 0.05% Al, 0.02 to 0.25% solid solution Ti, <=0.005% N, and the balance iron with inevitable impurities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a viscoelastic polymer resin having excellent vibration damping ability, which is laminated between two steel plates, and can effectively reduce vibration and noise. The present invention relates to a so-called resin composite type vibration-damping steel sheet that has excellent resistance weldability represented by spot welding, seam welding, projection welding and the like in addition to perforation resistance and corrosion resistance, and can be reused as scrap.

Such a resin composite type vibration damping steel plate is suitable for manufacturing a member which is required to reduce vibration and noise as well as corrosion resistance under a use environment in fields such as automobiles, electric equipment and construction. Can be used.

[0003]

2. Description of the Related Art Vibration-damping steel plates made of ordinary steel plates are widely used for various industrial purposes. In order to prevent corrosion and to secure sufficient characteristics even if corrosion occurs. In addition, a large amount of cost has been conventionally consumed. For example, in the field of automobiles, damping steel plates are used for oil pans, etc., but such members are exposed to large temperature changes and are impacted by stones flying at high speeds, and in cold regions. It is used in a very severe corrosive environment, such as in contact with snow-melting agents. In addition, from the viewpoints of protection of global environment, improvement of fuel efficiency of automobiles, improvement of riding comfort, and the like in recent years, steel sheets used for automobiles have a tendency to have higher strength and thinner thickness.

In particular, in the important members such as the oil pan of the automobile as described above, the steel plate has no holes due to corrosion, and the required strength is ensured even if corrosion does not occur. In order to achieve this, it is necessary that the necessary plate thickness remains, and when the member is thinned, it is required to improve the rust preventive ability of the raw steel plate. Further, recently, from the viewpoint of high quality and high texture, a vibration-damping steel plate with less corrosion and excellent corrosion resistance is required. Especially in North America, Europe, etc., especially in the cold regions where salt, potassium chloride, magnesium chloride, and other road deicing agents are sprayed in the winter, and gravel is sprayed on roads to prevent slipping It is said that

Further, although vibration-damping steel sheets for automobiles are manufactured by press working, the scraps are melted by automobile manufacturers and reused as raw materials for castings for engines and the like. In particular, when the raw steel sheet contains a large amount of elements such as P that deteriorate the toughness, there is a problem that reuse is limited.

Conventionally, by adding elements such as P and Cu alone or in combination to a steel sheet, a dense rust layer due to those elements is formed on the steel sheet. As a result, the subsequent progress of corrosion is delayed and corrosion resistance is improved. For example, Japanese Patent Laid-Open No. 2-
It is already known as described in Japanese Patent No. 22416. However, when the scrap of the vibration-damping steel plate is reused in the casting, when the content of P and Cu in the scrap is large, the toughness of the obtained casting is deteriorated. Therefore, those elements should be removed when the scrap is melted. is required.
However, Cu cannot be removed by the current refining technology, and on the other hand, in order to remove P, expensive melting equipment such as a cupola furnace is required.

On the other hand, in order to improve the corrosion resistance, a damping steel sheet using a galvanized steel sheet such as a hot-dip galvanized steel sheet, an alloyed hot-dip galvanized steel sheet, an electrogalvanized steel sheet, and an electroplated steel sheet such as a Zn-Ni alloy is also known. However, the manufacturing cost is high.

Furthermore, when finishing the processed semi-molded product into a final product such as an oil pan, it is necessary to bond various accessories and reinforcing members to the steel plate depending on the product. Conventionally, resistance welding typified by spot welding and projection welding, which are easy to work, has been widely used. However, since the viscoelastic polymer resin laminated between the two steel plates is an electrical insulator,
It cannot be energized as it is, and therefore a short-circuit jig and an auxiliary electrode are used, but the welding work is complicated.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems in a vibration-damping steel sheet, and has improved perforation resistance and corrosion resistance as well as welding workability when assembling parts. It is an object of the present invention to provide a resin-composite type vibration-damping steel sheet which has excellent resistance weldability and is easy to reuse as scrap.

[0010]

A resin composite type vibration-damping steel sheet having excellent perforation resistance, corrosion resistance, and resistance weldability according to the present invention has a viscoelastic polymer resin in which metal particles are dispersed, In a resin composite type damping steel plate, which is obtained by pressure-bonding two steel plates, and a layer of the viscoelastic polymer resin is laminated between them, at least one of the steel plates is (a) C
0.08% or less, Si 2.0% or less, Mn exceeding 0.02%, 2.5% or less, P less than 0.10%, S 0.01
% Or less, Al 0.003 to 0.05%, solid solution Ti 0.02
.About.0.25% and N 0.005% or less The thickness of the laminated viscoelastic polymer resin layer composed of the balance iron and unavoidable impurities is t (μm), and the two steel plates are When the average particle diameter of the metal particles contained in the viscoelastic polymer resin before pressure bonding is d (μm), d /
It is characterized in that t is in the range of 1.1 to 2.5.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION First, the chemical composition of the vibration damping steel sheet according to the present invention will be described. C is an element that strengthens steel. However, if the amount of C is more than 0.08% by weight, a large amount of carbide such as cementite, which becomes the cathode during corrosion in a normal process, is generated, and corrosion is promoted due to the potential difference between the carbide and the base iron, resulting in corrosion resistance. Lower. Therefore,
The upper limit of the C content is 0.08% by weight.

Si is an element effective for adjusting strength while ensuring ductility during deoxidation and pressing, but when added in an amount of more than 2.0% by weight, steel sheet during hot rolling is used. Since it thickens on the surface and deteriorates the pickling property of the steel sheet, its upper limit is made 2.0% by weight.

Mn is an element effective for preventing hot cracking due to S and for adjusting strength, but if it is less than 0.02% by weight, it is poor in the effect for preventing hot cracking due to S and strengthens. Effect is small. On the other hand, when Mn is added in an amount of more than 2.5% by weight, the total elongation decreases remarkably,
It is not preferable from the viewpoint of workability. Therefore, in the present invention, the amount of Mn exceeds 0.02% by weight and is 2.5% by weight or less.

P is an element effective for adjusting the strength while ensuring press workability, but if the content is more than 0.10% by weight, embrittlement after working is brought about. ,
The upper limit is 0.10% by weight. Particularly, in the present invention, from the viewpoint of scrap processing, 0.03% by weight or less is preferable.

In steel, S is present as a sulfide-based inclusion by combining with a metal element or the like. This sulfide-based inclusion causes a potential difference between the sulfide-based inclusion and the base metal and serves as a starting point of corrosion. Therefore, the lower the S concentration, the better. In particular, when the S concentration is more than 0.01% by weight, the corrosion resistance is extremely deteriorated due to an increase in the amount of sulfide inclusions.
The amount is 0.01% by weight.

Al is added for the purpose of deoxidation, but when the addition amount is less than 0.003% by weight, deoxidation is not sufficiently performed and the O content in steel cannot be reduced. On the other hand, 0.0
Even if added in excess of 5% by weight, the effect is saturated. Therefore, in the present invention, the amount of Al is 0.003-0.
The range is 05% by weight. The damping steel sheet according to the present invention contains solid solution Ti in the range of 0.02 to 0.25% by weight. The rust of iron is that metal Fe is first eluted as Fe ²⁺ (or Fe ³⁺ ) ions and then converted into hydroxide or oxide. When the metallic Fe becomes Fe ²⁺ (Fe ³⁺ ) ions and is eluted, the solid solution element is eluted together with the iron.

According to the present invention, as shown in FIG. 1, by setting the amount of solid solution Ti to be 0.02% by weight or more, the corrosion resistance evaluated by the perforation depth can be effectively improved. .
However, when the amount of solid solution Ti is more than 0.25% by weight, the size of Ti-based inclusions becomes large and the workability deteriorates. Therefore, the amount of solid solution Ti is 0.02 to 0.25% by weight.
Range.

As a mechanism for improving the corrosion resistance by solid solution Ti, addition of Ti remarkably enhances the passivation ability, and the Ti ion improves the structure and morphology of iron oxyhydroxide. And the formation of a dense rust layer such as TiO ₂ can be considered.

When the content of N increases, aging occurs, and a part of N combines with Ti to form TiN, which reduces the amount of solid solution Ti and deteriorates the corrosion resistance. Therefore, the upper limit is set to 0.005% by weight.

The damping steel sheet according to the present invention comprises the above-mentioned elements.
In addition to (a), (b) Cu 0.05 to 0.50%, Ni 0.5.
05-0.50% or less, Ca 0.0004-0.0100
%, And at least one element selected from the group consisting of REM 0.0004 to 0.0100%.

The vibration-damping steel sheet according to the present invention comprises (c) Cr 0.005-0.20%, N in addition to the above-mentioned element (a).
b 0.005-0.10%, V 0.005-0.10%,
Mo 0.005 to 0.25%, Zr 0.005 to 0.10
%, B 0.0003 to 0.0060%, at least one element selected from the group consisting of may be contained.

Further, the vibration-damping steel sheet according to the present invention may contain the above-mentioned elements (b) and (c) in addition to the above-mentioned element (a). Cu is an element that densifies the generated rust and improves corrosion resistance, and at least 0.05% must be added to effectively obtain this effect. However, even if added over 0.50% by weight, the effect of corrosion resistance saturates, and
Since the workability decreases, the upper limit of the amount added is set to 0.50% by weight.

Ni is added to improve the surface properties of the product. In a steel with a high Cu content, bald spots are likely to occur on the surface.
By adding, it is possible to prevent this defect and improve the surface texture. Further, Ni is an element that contributes to the improvement of corrosion resistance. To obtain these effects effectively, addition of at least 0.05% is necessary. However, even if added in excess of 0.50% by weight, the effect of improving surface properties and corrosion resistance saturates, and Ni is expensive, so its upper limit is made 0.50% by weight.

When the amount of Cu added exceeds 0.40% by weight, it is desirable to add Ni in the same amount as half of the amount of Cu from the viewpoint of surface texture. Cr is effective for strengthening steel, and at least 0.0 is necessary to effectively obtain this effect.
It is necessary to add 05%. However, 0.20%
Even if added in excess, the strengthening effect saturates and the corrosion resistance deteriorates by promoting uneven corrosion, so the upper limit is made 0.20%.

Nb is effective in strengthening the steel and improving the workability. Further, addition of Nb increases the solid solution Ti,
Although effective in improving corrosion resistance, at least 0.005% addition is necessary to obtain these effects effectively. However, when Nb is added in excess of 0.10% by weight, not only the embrittlement of the steel is caused but also the manufacturing cost becomes high, so the upper limit is made 0.10% by weight.

V is also effective in strengthening the steel and improving the workability, and in order to obtain this effect effectively, V is at least 0.
Addition of 005% is required. However, even if added in excess of 0.10% by weight, the above effects saturate, and the steel becomes brittle and expensive, so the upper limit is 0.10.
% By weight.

Zr is also effective in strengthening the steel and improving the workability. To obtain this effect effectively, at least
Addition of 0.005% is required. However, 0.10% by weight
Even if it is added in excess, the effect will be saturated, and
The steel becomes brittle and expensive, so the upper limit is 0.1.
0% by weight.

Mo is also effective in strengthening the steel and improving the workability. To obtain this effect effectively, at least
Addition of 0.005% is required. However, 0.25% by weight
Even if it is added in excess, the effect will be saturated, and
Since it becomes expensive, the upper limit is set to 0.25% by weight.

B is effective for improving the embrittlement of steel after working. In order to obtain this effect effectively, it is necessary to add at least 0.0003%. But,
If more than 0.0060% is added, the steel conversely becomes brittle, so the upper limit of the amount added is set to 0.0060% by weight.

Ca is added to reduce the development of corrosion in steel. In general, when iron corrosion is progressing, a reaction of Fe → Fe ²⁺ + e ⁻ Fe ²⁺ + 2H ₂ O → Fe (OH) ₂ + 2H ⁺ occurs inside the pit and acidification occurs inside the pit. The corrosion of iron is further promoted. However, when Ca is present in the steel, Ca is dissolved at the same time as iron, and since Ca is an alkali metal here, the inside of the pitting corrosion is made basic and the progress of pitting corrosion is reduced. In order to effectively obtain the effect of such Ca,
At least 0.0004% addition is required. But,
If more than 0.01% by weight is added, not only will the effect be saturated, but it will also cause embrittlement of the steel.
The amount is 0.01% by weight.

REM (rare earth element), like Ca,
It is effective for basifying the inside of pitting corrosion and reducing the progress of pitting corrosion. To obtain this effect effectively, at least 0.0
It is necessary to add 004%. But 0.01
Even if added in excess of wt.%, Not only will the effect be saturated, but it will also cause embrittlement of the steel, so the upper limit is 0.01%.
% By weight. The vibration-damping steel plate according to the present invention can be obtained by interposing a layer made of a viscoelastic polymer resin between such steel plates according to a conventionally known ordinary method.

In the present invention, the viscoelastic polymer resin contains metal particles in order to impart excellent resistance weldability to the obtained damping steel sheet. According to the present invention, the viscoelastic polymer resin preferably contains metal particles in the range of 1.0 to 10% by volume.
It is preferable that 0% by volume or more has a size in a range of 44 to 104 μm according to a sieve defined by JIS Z 8801D. Thus, the resin composite type vibration damping steel plate capable of performing direct resistance welding by dispersing and mixing the metal particles in the viscoelastic polymer resin, interposing the metal particles between the two steel plates, and crimping the steel plates. Can be obtained.

In the resistance welding of such a resin composite type damping steel plate, an electric current is supplied through the metal particles uniformly dispersed in the resin at the initial stage of the welding operation, and the electric current at this time, the electrode tip and the steel plate are supplied. Joule heat is generated by the contact resistance with the resin, the resin is melted and softened by the Joule heat, and the resin is removed by pressurizing the electrode tip.
The steel sheets are brought into metal contact with each other, and the resistance heat generated between the steel sheets at that time causes the steel sheets to melt to obtain a joint structure. Therefore, the amount of the metal particles added to the viscoelastic polymer resin may be such that the resin can be eliminated and the welding current can be carried during the contact between the two steel plates in the initial stage of the welding operation as described above. For that purpose, the addition amount of the metal particles may be 1.0% by volume or more in the viscoelastic polymer resin. On the other hand, the larger the amount of metal particles added to the viscoelastic polymer resin, the more stable the resistance weldability becomes, but when the amount added is too large, it is used as a damping steel plate that converts vibration energy into heat energy. Since the required vibration damping performance is reduced, the upper limit of the amount added is 1.
0% by volume.

The metal particles used in the present invention include
It is desirable that the melting point be close to that of the steel plate used for the resin composite type vibration damping steel plate. In the case of a metal having a low melting point, when an electric current is supplied to remove the resin in the initial stage of the welding operation, the metal particles themselves are melted before the removal of the resin occurs, and the metal does not serve as an original current-carrying path. Therefore, in the present invention, metal particles having a melting point close to the melting point of the steel sheet, for example, iron powder,
Nickel powder, stainless powder, copper powder or a mixture of two or more of these is preferably used. On the other hand, metal powders such as aluminum powder, zinc powder, lead powder and tin-tin powder have lower melting points than steel plates and are not suitable for use in the present invention.

In the resin composite type vibration damping steel plate, in order to bear the electric current in the initial stage of welding, it is necessary that the steel plates constituting the vibration damping steel plate and the metal particles are in good contact with each other.
Therefore, according to the present invention, in the vibration-damping steel plate, the thickness of the layer of the viscoelastic polymer resin laminated between the two steel plates is set to t (μm), and before the two steel plates are pressure bonded. The average particle size of the metal particles contained in the viscoelastic polymer resin is d (μ
m), metal particles having d / t in the range of 1.1 to 2.5 are used, and a viscoelastic polymer resin containing such metal particles is interposed between two steel plates. , Through this 2
By pressing the sheets of steel plate under heat, the metal particles are deformed, thus forming a stable metal contact between the steel plate and the metal particles, while joining the steel plates through the resin layer, the result According to the present invention, stable resistance weldability can be obtained.

That is, according to the present invention, metal particles having a particle size larger than the thickness of the viscoelastic polymer resin to be laminated between the steel plates are uniformly dispersed in the viscoelastic polymer resin. A resin is sandwiched between two steel plates, and when the two steel plates are thermocompression-bonded via the resin, the metal particles are compressed and deformed, so that a stable metal is provided between the steel plates and the metal particles. Get in touch.

Therefore, as compared with the thickness of the resin layer laminated between the two steel plates, too fine metal particles are isolated in the resin even after the resin is laminated between the steel plates, and the electric current is not applied. Does not play a role as a circuit. On the other hand, too coarse metal particles can be deformed when the resin is laminated between the steel plates, but the amount of deformation is too large and the amount of biting into the steel plate surface becomes large, resulting in unevenness on the surface of the steel plate. It is not preferable because it will cause heat loss. Therefore, according to the present invention, the thickness of the layer of the viscoelastic polymer resin laminated between the two steel plates is set to t (μm), and the viscoelastic polymer is bonded before the two steel plates are pressure bonded. When the average particle size of the metal particles contained in the resin is d (μm), it is preferable to use metal particles having d / t in the range of 1.1 to 2.5.

Further, according to the present invention, the thickness t of the viscoelastic polymer resin layer formed between the two steel plates is not particularly limited, but the vibration damping performance and the resistance welding are not limited. In order to have excellent properties, the range of 20 to 80 μm is usually preferable. When the thickness of the resin layer is smaller than 10 μm, the vibration damping performance of the resin layer is rapidly reduced, which is not preferable. In particular, according to the present invention, by mixing the metal powder with the resin, the metal particles exhibit a rocking effect of inhibiting the shear deformation of the resin. Therefore, it is preferably 20 μm or more.

However, if the resin layer is too thick, the difference between the strength of the resin itself and the strength of the steel sheet becomes too large, and the amount of misalignment during processing becomes large, which may hinder the processing. The layer thickness is preferably 80 μm or less. Therefore, when the thickness of the resin layer laminated between the steel plates is in the range of 20 to 80 μm, as described above, in order not to include a large amount of fine particles or coarse particles as described above, According to the present invention, the metal particles are JIS
When classified using a sieve specified in Z8801,
The total particle size in the range of 44 to 104 μm is 70
It is preferable to use metal particles that account for not less than volume%.

As described above, the metal particles which can be preferably used in the present invention can be produced by various methods such as a water atomizing method, a gas atomizing method, a gas reducing method and a rotating electrode method. In the present invention, the viscoelastic polymer resin is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used. Therefore,
In the present invention, for example, thermoplastic polyester resin, polyethylene, polypropylene, other polyolefin resins, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, vinyl acetate resin, polyamide resin, polyimide resin, etc. are preferably used. it can.

The resin composite type vibration-damping steel plate according to the present invention has a three-layer structure of steel plate / resin layer / steel plate. Such a vibration-damping steel plate is generally a degreasing cleaning process for cleaning the steel plate surface, a temporary mounting process for temporarily mounting a viscoelastic polymer resin on one or both steel plate surfaces, or a temporary mounting process for the steel plate surface. Through the steps of pressure-bonding the two steel plates with the resin inside and interposing the resin, securing the temperature and time for obtaining the adhesive strength, cooling the resin, and winding the damping steel plate Manufactured. The degreasing and cleaning process of the steel plate surface is a process of cleaning the steel plate surface using an alkaline aqueous solution, an organic solvent, etc., which removes oil, dirt, dust, etc. on the steel plate surface to ensure sound adhesion with the resin. Then, it is performed to firmly bond the resin to the steel plate.

The step of temporarily attaching the resin is a step of temporarily attaching the resin to the surface of both or one of the steel plates, and is usually a film type resin, a resin diluted with a solvent, or a hot-melt type resin which melts when the temperature rises. Resin is used. The pressure-bonding step is a step of laminating and bonding the resin onto the surface of the steel sheet to the Sangertian type damping steel sheet, which is usually performed under pressure and heating. Pressurized resin /
It also has the function of preventing bubbles such as air from being caught in between the resins and at the steel plate / resin interface. Therefore, the crimping process is usually
The steel plate to which the resin is temporarily attached is pressed using a hot roll.
The heating temperature at this time is a temperature equal to or higher than the melting temperature of the resin used, but the optimum temperature and pressure are selected according to the resin used.

[0043]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples. A steel plate coil (thickness: 0.5 mm, width: 914 mm) adjusted to have the chemical composition shown in Table 1 by a converter was manufactured. The steel plates 1 and 2 had the chemical composition defined in the present invention, while the steel plate 3 had a conventional composition. Two such steel plates were selected in combination as described below to produce the following damping steel plates 1 to 4.

Damping steel plate 1: Steel plate 1 and steel plate 1 Damping steel plate 2: Steel plate 2 and steel plate 2 Damping steel plate 3: Steel plate 1 and steel plate 2 Damping steel plate 4: Steel plate 3 and steel plate 3 As viscoelastic polymer resin, Using a linear saturated polyester resin, use a sieve specified in JIS Z8801 to
Nickel powder classified in the range of 4-73 μm is 0.5-1
Mix and disperse in the range of 2% by volume, temporarily attach this to a steel plate, heat press bond at 230 ° C., and laminate thickness of resin 50 μm
The obtained damping steel plate was obtained.

[0045]

[Table 1]

The resistance weldability of these damping steel sheets was evaluated as follows. That is, the test piece (width 30 mm x
27 pieces (length 100 mm) were taken in the width direction of the coil, and two pieces were combined in the length direction at the same position in the width direction, spot welding was performed at the center of the overlap margin of 30 mm, and resistance weldability was evaluated. . Here, the weldability is 27 under the same welding conditions.
Welded zero, not energized, perforated with sparks,
The presence or absence of burning was judged by visually observing the surface of the welding test piece, and the defect occurrence rate was obtained.

The welding condition at this time is that the tip tip diameter is 6
mm, 40R, Cr-Cu dome type electrode was used, the electrode pressure was 2450N, the welding current was 10kA, and the energization time was 14 cycles (60Hz). The relationship between the addition amount of metal particles and the occurrence rate of welding defects is shown in FIG. 2, and the average particle diameter d (μ
m) and the thickness t (μm) of the resin layer on the damping steel plate d
The relationship between / t and the welding defect occurrence rate is shown in FIG. 1 and 2 also show the loss coefficient.

The corrosion resistance was examined as follows. That is,
After applying a phosphate treatment to the surface of the vibration-damping steel plate, cationic electrodeposition coating (PT-U-80 manufactured by Nippon Paint Co., Ltd., coating thickness: 15 μm) was performed, and then a cross-cut reaching the substrate was applied, and salt water was applied. Spray and leave at 50 ° C for 16 hours, 70 ° C
Dried for 4 hours at a temperature of 50 ° C and a relative humidity of 85
%, A corrosion acceleration test was carried out by performing 100 cycles of standing for 4 hours in a humid environment, and at that time, the erosion depth of the crosscut portion was determined in mm. In the figure, it is shown as "cross cut".

In addition, "flat plate surface" and "chipping"
Was examined. The flat plate surface shows the result of the above corrosion test degreased with trichlene. For chipping, 1 kg of granite 5 times each, 3 times with air pressure of 500 kPa
The results are obtained by performing the above-mentioned corrosion test in a state of being hit from a position 0 cm apart and having a surface scratched by chipping. The above corrosion test results for the damping steel plates 1 and 2 are compared with the results of the damping steel plate 4 manufactured using the conventional steel plate, and are shown in FIGS. 4 and 5, respectively. It is understood that the damping steel sheet according to the present invention has excellent resistance to perforation and corrosion.

Next, the edge corrosiveness was determined by examining the change in the adhesive strength between the steel sheet and the resin with the progress of corrosion from the resin adhesive surface from the edge of the steel sheet. That is, the vibration-damping steel plates 1 and 2 were shear cut into a size of 25 mm in width and 200 mm in length to prepare a test piece, and in order to prevent corrosion of the surface of the steel plate, a tape was attached to the surface and then sprayed with salt water, 5
A corrosion acceleration test was conducted by conducting 50 cycles of standing at 0 ° C. for 16 hours, drying at 70 ° C. for 4 hours, and then standing in a humid environment at a temperature of 50 ° C. and a relative humidity of 85% for 4 hours. The adhesive strength of the resin layer was measured by the T peel test. FIG. 4 shows the results. In the vibration-damping steel sheet according to the present invention, the decrease in adhesive strength of the resin layer is well suppressed.

[0051]

As described above, the vibration-damping steel sheet according to the present invention, by effectively utilizing the solid solution Ti, is resistant to perforation, edge corrosion resistance and resistance even in a highly corrosive environment. It has excellent weldability, and the adhesive strength of the viscoelastic polymer resin layer between the steel sheets to the steel sheet is also stable, and is suitable, for example, in the unfavorable field of corrosion such as transportation equipment including automobiles, construction, and electrical equipment. Can be used for.

Moreover, the vibration-damping steel sheet according to the present invention can obtain corrosion resistance due to the effect of solid solution Ti even if the amount of P added in the steel is reduced, so that it can be reused as scrap. It has few restrictions and is easy to reuse as scrap.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the amount of solid solution Ti and the depth of perforation.

FIG. 2 is a graph showing the relationship between the amount of metal particles added to a viscoelastic polymer resin and the welding defect occurrence rate in a vibration damping steel plate obtained using such a resin.

FIG. 3 is an average particle diameter d (μm) of metal particles blended in a viscoelastic polymer resin and a thickness t of a resin layer in a damping steel plate.
It is a graph which shows the relationship between the ratio d / t of (micrometer) and the welding failure occurrence rate in the damping steel plate obtained using such resin.

FIG. 4 is a graph showing the relationship between the corrosion promotion cycle and the maximum perforation depth in a composite corrosion test for the vibration-damping steel plate 1 and the vibration-damping steel plate 4 having the conventional composition.

FIG. 5 is a graph showing the relationship between the corrosion promotion cycle and the maximum perforation depth in the composite corrosion test for the vibration-damping steel plate 2 and the vibration-damping steel plate 4 including the steel plate having the conventional composition.

FIG. 6 is a graph showing the relationship between the corrosion acceleration cycle and the T-peel strength of the resin layer in the composite corrosion test for the damping steel plates 1 and 2 and the damping steel plate 4 composed of the conventional composition. .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication C22C 38/16 C22C 38/16 38/54 38/54 38/58 38/58 (72) Inventor Masato Matsumoto 1 Kanazawa-machi, Kakogawa-shi, Hyogo Kadogawa Works Kakogawa Works

Claims (12)

[Claims] 1. A resin composite type vibration damping system comprising a viscoelastic polymer resin having metal particles dispersed therein, two steel plates being pressure bonded together, and a layer of the viscoelastic polymer resin being laminated between them. In steel sheets, at least one of the above steel sheets is C 0.08% or less by weight%, Si 2.0% or less, Mn 0.02% or more, 2.5% or less, P 0.10% or less, S 0. 0.01% or less, Al 0.003 to 0.05%, solid solution Ti 0.02 to 0.25%, and N 0.005% or less The balance consists of iron and unavoidable impurities, and the above-mentioned laminated viscoelasticity When the thickness of the polymer resin layer is t (μm) and the average particle diameter of the metal particles contained in the viscoelastic polymer resin before the two steel plates are pressure bonded is d (μm), d /
A resin composite type vibration damping steel plate having excellent perforation resistance, corrosion resistance and resistance weldability, characterized in that t is in the range of 1.1 to 2.5. 2. A viscoelastic polymer resin containing metal particles in an amount of 1.0 to 10
The resin composite type vibration damping steel plate according to claim 1, wherein the resin composite type vibration damping steel plate is contained in a volume% range. 3. The metal particles are at least one selected from iron powder, nickel powder, stainless powder and copper powder.
Alternatively, the resin composite type vibration damping steel plate according to the item 2. 4. 70% by volume or more of metal particles are JIS Z
8801D The resin composite type vibration damping steel plate according to claim 1, 2 or 3 having a size in the range of 44 to 104 µm according to the specified sieve. 5. A resin-composite type vibration damping system in which two steel plates are pressure-bonded with a viscoelastic polymer resin in which metal particles are dispersed interposed, and a layer of the viscoelastic polymer resin is laminated between them. In steel sheets, at least one of the above steel sheets is (a) C 0.08% or less, Si 2.0% or less, Mn 0.02% or more, 2.5% or less, P 0.10% or less. , S 0.01% or less, Al 0.003 to 0.05%, solid solution Ti 0.02 to 0.25%, and N 0.005% or less, and (b) Cu 0.05. To 0.50%, Ni 0.055 to 0.50% or less, Ca 0.0004 to 0.0100%, and REM 0.0004 to 0.0100%, and at least one element selected from the group consisting of Then, the thickness of the layer of the viscoelastic polymer resin, which is composed of the balance iron and unavoidable impurities and is laminated, is t (μm),
When the average particle diameter of the metal particles contained in the viscoelastic polymer resin is d (μm) before the two steel plates are pressure bonded,
A resin composite type vibration-damping steel sheet excellent in perforation resistance, corrosion resistance, and resistance weldability, characterized in that d / t is in the range of 1.1 to 2.5. 6. A viscoelastic polymer resin containing metal particles in an amount of 1.0 to 10
The resin composite-type vibration-damping steel sheet according to claim 5, wherein the resin composite-type vibration-damping steel sheet is contained in the range of volume%. 7. The metal particles are at least one selected from iron powder, nickel powder, stainless powder and copper powder.
Further, the resin composite type vibration damping steel plate described in 6. 8. 70% by volume or more of metal particles are JIS Z
8801D The resin composite type vibration-damping steel plate according to claim 5, 6 or 7 having a size in the range of 44 to 104 µm according to the specified sieve. 9. A resin composite type vibration damping system comprising a viscoelastic polymer resin having metal particles dispersed therein, two steel plates being pressure bonded together, and a layer of the viscoelastic polymer resin being laminated therebetween. In steel sheets, at least one of the above steel sheets is (a) C 0.08% or less, Si 2.0% or less, Mn 0.02% or more, 2.5% or less, P 0.10% or less. , S 0.01% or less, Al 0.003 to 0.05%, solid solution Ti 0.02 to 0.25%, and N 0.005% or less, and (b) Cu 0.05. .About.0.50%, Ni 0.050 to 0.50% or less, Ca 0.0004 to 0.0100%, and REM 0.0004 to 0.0100%, and at least one element selected from the group consisting of: (c) Cr 0.005 to 0.20%, Nb 0.005 to 0.10%, V 0.005 to 0.10%, Mo 0.005 to 0.25%, and B 0.0003 to 0%. .0 And at least one element selected from the group consisting of 060%, the balance being iron and unavoidable impurities, and the thickness of the laminated viscoelastic polymer resin layer being t (μm),
When the average particle diameter of the metal particles contained in the viscoelastic polymer resin is d (μm) before the two steel plates are pressure bonded,
A resin composite type vibration-damping steel sheet excellent in perforation resistance, corrosion resistance, and resistance weldability, characterized in that d / t is in the range of 1.1 to 2.5. 10. The viscoelastic polymer resin comprises metal particles in an amount of 1.0-1.
The resin composite type damping steel plate according to claim 9, wherein the resin composite vibration damping steel plate is contained in an amount of 0% by volume. 11. The resin composite type vibration damping steel sheet according to claim 9, wherein the metal particles are at least one selected from iron powder, nickel powder, stainless powder and copper powder. 12. 70% by volume or more of the metal particles are JIS Z.
8801D The resin composite type vibration damping steel plate according to claim 9, 10 or 11, having a size in the range of 44 to 104 µm according to the specified sieve.