JPH0711461A - Alloy laminated type plated high damping steel plate excellent in workability and corrosion resistance - Google Patents

Abstract

PURPOSE:To produce an alloy laminated type plated high damping steel plate excellent in workability and corrosion resistance by forming an ultra-low carbon steel A and a twin type high damping alloy B composed of copper alloy into a laminated state by a casting method so that a plate thickness direction of A-B-A is formed and then applying Zn-Fe alloy plating to the layers A on both sides. CONSTITUTION:A multilayer structure material, where a steel having a composition consisting of, by weight, 0.0005-0.0800% C, 0.05-1.50% Mn, 0.003-0.2% P, <0.1% Al, 0.0010-0.0500% N, and the balance Fe or further containing one or more kinds among <0.4% Ti, <0.2% Nb, <0.2% Zr, and <0.0080% B is used as a layer A and a twin type high damping alloy having a composition consisting of 9.0-16.0% Al, 2.4-5.5% Ni, and the balance Cu is used as a layer B, is prepared by a casting method. At this time, this material has a plate thickness direction structure of A-B-A, and further, the ratio of the thickness of the layer B based on the total plate thickness is regulated to 4-60%. Subsequently, respective surfaces of the layer A members on both sides of this multilayer structure material are plated with Zn-Fe alloy where the average content of Zn in a plate thickness direction is regulated to 5-93%. By this method, the multilayer structure material excellent in corrosion resistance, workability, and damping characteristic can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloy composite type vibration damping steel sheet having excellent workability and corrosion resistance, which is used as a structural material for general processing such as automobiles and building materials.

[0002]

2. Description of the Related Art Steel sheets used for automobiles and building materials are
Since it undergoes press working and bending, it is required to have excellent workability. Therefore, it is said that those steel sheets need to have low yield strength, high elongation, and high Rankford value. On the other hand, from the viewpoint of weight reduction, it is desirable that the tensile strength be as high as possible. Further, since it is often used in a corrosive environment such as outdoors, excellent corrosion resistance is also required.

On the other hand, in recent years, noise and vibration have become a social problem as pollution due to the development of transportation facilities and the approach of houses to factories. Also, noise and vibration have been created in the workplace for the purpose of improving the working environment. It tends to regulate vibration. In response to such a trend, it is required to add vibration damping performance to a metal material that is a noise source or a vibration source and to improve the vibration damping performance.

From such a background, there has been a need for a steel sheet which is excellent in press workability and bending workability, is excellent in corrosion resistance, and is also excellent in vibration damping property and appropriately high in strength.

Several proposals have been made for such steel sheets.

For example, Japanese Examined Patent Publication No. 45-35662 discloses a composite vibration-damping steel sheet having a three-layer structure in which a viscoelastic intermediate layer made of a viscoelastic resin is sandwiched between two metal layers. This resin composite type damping steel plate is used for automobile oil pans, engine covers, hopper chute parts,
It is used as a stopper for transportation equipment, a vibration reduction member for home electric appliances and other metal working machines, and a structural member for precision machinery where vibration prevention is desired.

The Cu-Al-Ni type alloy described in "Iron and Steel", No. 60 (1974) No. 14, page 2203, is a twin type vibration damping alloy having high vibration damping performance and high strength. It has been known since ancient times. Damping alloys are generally classified into composite type, ferromagnetic type, dislocation type, twin type, and others. Among them, twin type damping alloys are considered to be metal materials that have both damping performance and strength characteristics. .

[0008]

Although each of them has a corresponding effect, since the resin composite type vibration damping steel plate begins to deteriorate when the viscoelastic intermediate layer exceeds about 100 ° C., it becomes like an automobile exhaust system member. It cannot be applied to applications where heat resistance and strength are particularly required. Also, the corrosion resistance is poor. Twin type vibration damping alloys have not been put to practical use in consumer products because they are extremely expensive and almost impossible to process. It is an object of the present invention to provide a composite steel sheet that satisfies these comprehensive performances at the same time.

[0009]

The gist of the present invention is as follows.

% By weight, C: 0.0005 to 0.
0800%, Mn: 0.05 to 1.50%, P: 0.
003 to 0.2%, Al: 0.1% or less, N: 0.0
A layer of steel containing 010 to 0.0500% and the balance consisting of iron and unavoidable impurities and a layer B of twin type vibration damping alloy are made to have a structure in the thickness direction of ABA. The average content of Zn in the plate thickness direction is 5 to 5 on the base steel plate having a multilayer structure manufactured by the casting method so that the ratio of the thickness of the B layer to the total plate thickness after solidification is 4 to 60%. Z which is 93%
An alloy composite-type plated damping steel sheet excellent in workability and corrosion resistance, which is characterized by having an n-Fe alloy coating.

The A layer of steel has a T content in addition to the above chemical composition.
i: 0.4% or less, Nb: 0.2% or less, Zr: 0.2
% Or less and B: 0.0080% or less, and the alloy composite-type plated damping steel sheet having excellent workability and corrosion resistance as described above.

% By weight, C: 0.0005 to 0.
0800%, Mn: 0.05 to 1.50%, P: 0.
003 to 0.2%, Al: 0.1% or less, N: 0.0
A layer of steel containing 010 to 0.0500%, the balance being iron and inevitable impurities, and Al: 9.0 to 16.0.
%, Ni: 2.4 to 5.5%, with the balance being B layer of an alloy consisting of Cu and unavoidable impurities, so as to have an ABA thickness direction structure and after solidification. Zn having an average Zn content in the plate thickness direction of 5 to 93% on a base steel plate having a multilayer structure manufactured by a casting method so that the ratio of the thickness of the B layer to the total plate thickness is 4 to 60%. An alloy composite-type plated damping steel sheet having excellent workability and corrosion resistance, which is characterized by having a Fe alloy coating.

In addition to the above chemical composition, the A layer of steel has T
i: 0.4% or less, Nb: 0.2% or less, Zr: 0.2
% Or less and B: 0.0080% or less, and the alloy composite-type plated damping steel sheet having excellent workability and corrosion resistance as described above.

[0014]

According to the present invention, when the composition of the steel sheet surface layer and the inner layer is changed, the ratio of the surface layer in the steel sheet thickness direction is specified, and the steel sheet surface is plated, the surface layer has low cost and good corrosion resistance and workability. Further, the inner layer is excellent in vibration damping property, so that it is possible to achieve both corrosion resistance, workability, vibration damping property and low cost as the whole multi-layer steel sheet.

The present invention will be described in detail below. All components are in weight%.

First, the components of the layer A, which is the surface layer of the three-layer structure, will be described.

Since the workability of C deteriorates as the content increases, the upper limit is limited to 0.0800%. In order to improve workability, the lower the content, the better, but 0.0
If it is less than 005%, the steelmaking cost becomes too large to achieve low cost, so the lower limit is limited to 0.0005%.

When the content of Mn is less than 0.05%, hot brittleness occurs and a steel sheet cannot be manufactured.
It is necessary to contain at least 05%. Further, Mn is an element that hardens steel, and the addition amount may be increased according to the required strength characteristics, but if the amount exceeds 1.50%, it is excessively hardened and the workability is impaired. Is limited to 1.50%.

P is also an element for hardening the steel, and the addition amount may be increased according to the required strength characteristics, but if the amount exceeds 0.2%, it will be excessively hardened and the workability will be impaired. , The upper limit is limited to 0.2%. For applications in which workability is more important than strength characteristics, the lower the P content, the more preferable. However, if it is less than 0.003%, the steelmaking cost will be excessive and low cost will not be achieved, so the lower limit is 0.003%. Limited to

Al is necessary for deoxidation, but its content is 0.
If it exceeds 10%, the amount of Al ₂ O ₃ -based inclusions increases, which may cause flange cracks and the like during the molding process, and also increase the cost, so the upper limit is limited to 0.10%.

N is a harmful unavoidable impurity element that causes aging. When it exceeds 0.0500%, workability deterioration such as stretcher strain occurs due to aging, and overhardening causes deterioration of workability. Therefore, the upper limit is limited to 0.0500%. The lower the N content is, the more preferable it is, but if it is less than 0.0010%, the steelmaking cost becomes excessive and the low cost is not achieved.
Limited to 10%.

For applications requiring complicated press workability, it is effective to add one or more of Ti, Nb, Zr and B in addition to the above components.

Ti, Nb and Zr are all carbonitride forming elements and can fix the solid solution C and the solid solution N in the steel to improve the workability and the non-aging property. However, if the amount of addition is large, the alloy cost becomes excessive and the low cost is not achieved, so Ti is 0.4%, Nb and Z
r has an upper limit of 0.2%.

B is effective in improving the secondary workability. However, if the amount of addition is large, the alloy cost becomes excessive and the low cost is not achieved, so 0.0080% is made the upper limit.

Next, the component composition of the B layer which is the inner layer of the three-layer structure will be described.

According to the research conducted by the present inventors, it is necessary that the B layer is a twin type damping alloy in order to obtain excellent damping performance. Twin-type vibration damping alloys include Au-Cd alloys,
Although any of the currently known components such as In-Tl alloy, Cu-Al-Ni alloy, and TiNi alloy may be used, Cu-Al- described below is particularly used for applications in which excellent vibration damping performance and strength characteristics are desired to be compatible. It is preferable to use a Ni alloy.

The preferred Cu-Al-Ni alloy composition is:
Al: 9.0 to 16.0%, Ni: 2.4 to 5.5%, with the balance being Cu and inevitable impurities. Although the mechanism is not clear, particularly excellent vibration damping performance and strength characteristics are obtained in this component range.

Next, the structure of the layers A and B will be described.

The A layer alone has a good workability and a low cost like ordinary thin steel sheets, but is inferior in vibration damping property. Although the layer B alone has excellent vibration damping properties, it is extremely expensive and difficult to process. To achieve the object of the present invention, A layer and B layer are
It is necessary to manufacture it by the casting method so as to have a structure in the plate thickness direction of B-A. In the plate thickness direction structure of B-A-B and A-B, it is not possible to achieve both workability and vibration damping property, no matter how the ratios of both layers are combined. Also, B-
In the case of the structure AB in the plate thickness direction, the composition of the surface layer is remarkably different from that of ordinary steel, and therefore, there is a drawback that the type of plating is restricted when it is used as an original plate of a surface-treated steel plate.

As a method for producing the multi-layered steel sheet, there are a casting method, a hot-rolling compression bonding method, an explosion-bonding method and the like. As a result of examining these manufacturing methods, the state of characteristic change at the interface, and the fracture phenomenon from the interface during heavy working, in the multi-layer steel sheet produced by a method other than the casting method, characteristic change at the interface, that is, separation of components Since it was abrupt, it was easy to break from the interface during strong working. Therefore, in order to realize excellent workability, it is essential to limit the manufacturing method to the casting method.

Next, the thickness ratio of the A layer and the B layer will be described.

The thickness of the layer B needs to be 4% or more in terms of a ratio to the total plate thickness in order to secure excellent vibration damping properties.
On the other hand, if the thickness of the B layer is increased, the workability is deteriorated and the cost is significantly increased. Therefore, it is necessary to set the thickness to 60% or less.

Next, the surface treatment of the layer A will be described.

In order to exert excellent corrosion resistance even in a corrosive environment such as outdoors, it is necessary to coat the surface of the layer A with a Zn--Fe alloy. If the average content of Zn in the thickness direction is less than 5%, sufficient corrosion resistance cannot be obtained. Therefore, the lower limit of the average content of Zn in the Zn-Fe alloy coating is limited to 5%. Further, when the average content of Zn in the plate thickness direction exceeds 93%, paint adhesion, workability and weldability deteriorate, so the upper limit is limited to 93%. This Zn-Fe alloy coating can achieve the object of the present invention if the average content of Zn in the plate thickness direction is within this range, and a film in which the Zn content changes in the plate thickness direction, The film may be a film in which layers having different Zn contents are laminated, and the crystal structure does not matter. The method of applying the Zn-Fe alloy coating on the surface of the A layer may be any method such as hot dipping, electroplating, or vapor deposition.

In the present invention, the hot rolling, cold rolling and annealing conditions are not particularly limited, but the hot rolling is preferably performed at a finishing temperature of 800 to 950 ° C. from the viewpoint of workability and productivity.
The winding temperature is preferably 500 to 750 ° C. from the viewpoint of workability and pickling property. The cold rolling is preferably performed at a reduction rate of 60 to 93%, and the annealing is preferably performed at a temperature of 600 to 900 ° C to ensure workability. Z as required
An organic coating may be further applied to the surface of the n-Fe alloy coating.

[0036]

EXAMPLE A molten steel for the A layer and the B layer was adjusted to the components shown in Tables 1 and 2 to obtain a multi-layer cast product by a two-nozzle casting method. No. For comparative example 7, a multi-layer steel slab was obtained by the hot rolling compression bonding method. The multilayer structure in the plate thickness direction was an ABA type, the thickness of the A layer was the same on both surface layers, and the ratio of the B layer thickness to the total thickness is shown in Table 2. These cast pieces and steel pieces were heated at 1200 ° C. for 4 hours and then finished at a finishing temperature of about 930 with a continuous hot rolling mill.
4 mm thick steel strip at ℃, wound at about 730 ℃, pickled and cold rolled at 80%, followed by continuous annealing at 830 ℃ for 60 seconds, and further 1% temper rolling, A Zn-Fe alloy coating having the composition shown in Table 2 was plated. After that, the characteristics were evaluated.

[0037]

[Table 1]

[0038]

[Table 2]

Regarding the tensile properties, JIS No. 5 test pieces were sampled in the rolling direction, yield strength was 280 MPa or less, and tensile strength was 2
Those satisfying all the conditions of 60 MPa or more and the total elongation of 10% or more were evaluated as ◯, and the other materials were evaluated as x. Further, the Erichsen test was carried out in accordance with JIS standard Z2247, and those with an Erichsen value of 8 mm or more were evaluated as ◯, and those with an Erichsen value less than that were evaluated as x. Bending test is JIS standard Z
2248. The value obtained by dividing the minimum bending radius by the plate thickness was 0.4 or less, and the value exceeding 0.4 was evaluated as x. Regarding the interfacial fracture resistance, the rupture morphology during tensile deformation was observed, and the presence or absence of cracks from the interface was determined as x, and the absence at all was determined as o.

Regarding the vibration damping property, a bending vibration is applied to a test piece having a width of 10 mm and a length of 60 mm, and the loss coefficient is measured by the free damping method. It was evaluated as x. The measurement of the vibration damping property was performed in two ways, that is, when the test piece temperature was room temperature and when the test piece temperature was 240 ± 10 ° C.

The corrosion resistance was evaluated by performing a salt water spray-wet-dry cycle test on each sample having a cross-cut after coating having a coating thickness of 20 μm and evaluating the depth of perforation. The results were compared with the electrogalvanized steel sheet of SPCE-P10, which was measured at the same time, and those with a perforation depth equal to or less than that of the electrogalvanized steel sheet were evaluated as ◯, and those exceeding it were evaluated as x.

Table 3 shows the results of these characteristic evaluations.

[0043]

[Table 3]

No. 1-5 is an example of the present invention, the workability,
Excellent vibration control and corrosion resistance. On the other hand, No. Nos. 6 and 7 are comparative examples. In No. 6, since the A layer satisfies the conditions of the present invention, the workability is secured, but since the B layer and the metal coating deviate from the conditions of the present invention, the vibration damping property and the corrosion resistance are poor. N
o. No. 7 is inferior in corrosion resistance, workability, and vibration damping because all of the A layer, B layer, and metal coating deviate from the conditions of the present invention, and since it is manufactured by the hot rolling compression bonding method instead of the casting method, the interface fracture resistance is also poor. It was

[0045]

The steel sheet of the present invention is a multi-layer steel sheet having excellent corrosion resistance, workability, vibration damping property and low cost, which is excellent.

Claims (4)

[Claims] 1. By weight%, C: 0.0005 to 0.0800%, Mn: 0.05 to 1.50%, P: 0.003 to 0.2%, Al: 0.1% or less, N: 0.0010 to 0.0500%, with the balance being iron and inevitable impurities in the steel A layer, and twin type damping alloy B layer A-B-A plate thickness direction structure And the ratio of the thickness of layer B to the total plate thickness after solidification is 4 to
The average content of Zn in the plate thickness direction is 5 to 9 on the base steel plate having a multi-layer structure manufactured by the casting method so as to be 60%.
An alloy composite-type plated vibration-damping steel sheet having excellent workability and corrosion resistance, characterized by having a Zn-Fe alloy coating of 3%. 2. In addition to the above chemical components, the A layer of steel contains Ti: 0.4% or less, Nb: 0.2% or less, Zr: 0.2% or less, B: 0.0080% or less. The alloy-composite plated vibration-damping steel sheet having excellent workability and corrosion resistance according to claim 1, containing at least one kind. 3. By weight%, C: 0.0005 to 0.0800%, Mn: 0.05 to 1.50%, P: 0.003 to 0.2%, Al: 0.1% or less, N: 0.0010 to 0.0500%, the balance A of the steel consisting of iron and unavoidable impurities, Al: 9.0 to 16.0%, Ni: 2.4 to 5.5% B layer of an alloy containing Cu and unavoidable impurities, the balance of which is B, with respect to the total plate thickness after solidification so as to have a structure in the plate thickness direction of ABA.
A Zn-Fe alloy coating having an average Zn content in the plate thickness direction of 5 to 93% is formed on a base steel plate having a multilayer structure manufactured by a casting method so that the layer thickness ratio becomes 4 to 60%. An alloy composite type plated damping steel sheet having excellent workability and corrosion resistance, which is characterized by having. 4. In addition to the above chemical components, the A layer of steel contains Ti: 0.4% or less, Nb: 0.2% or less, Zr: 0.2% or less, B: 0.0080% or less. An alloy composite type plated damping steel sheet having excellent workability and corrosion resistance according to claim 3, containing at least one kind.