JPH09170049A - Damping alloy and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an alloy simultaneously excellent in damping capacity and toughness by specifying the compsn. of elements and the diffraction intensity ratio. SOLUTION: This alloy has a compsn. contg., by weight, <=0.02% C, 0.01 to 0.5% Si, <0.2% Mn, <=0.01% P, <=0.05% S, 0.5 to 3.5% Cr, 0.002 to 0.06% Al, <0.006% N, and the balance Fe with inevitable impurities, and in which the (200) diffraction intensity ratio is regulated to >=3.0. As for the diffraction intensity ratio, the higher, the better from the viewpoint only of damping capacity, but, from the equilibrium with toughness, in pratical, the upper limit is preferably suppressed to 12.0. As for the production of the alloy, a slab having the above compsn. is subjected to hot rolling in such a manner that the heating temp. is regulated to 1000 to 1150 deg.C, the draft at <=950 deg.C to 30 to 70% and the rolling finishing temp. to <=850 deg.C. After that, it is cooled to a room temp. and is subjected to tempering or annealing at 650 to 1000 deg.C.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a damping alloy having a high damping property and a damping alloy having a high toughness as a structural material for ships, bridges, industrial machines and constructions.

[0002]

2. Description of the Related Art Recently, ships, bridges, industrial machines, and buildings tend to be required to have high damping properties at the same time in addition to toughness which is a basic characteristic of structural materials. That is, for example, the problem of suppressing noise and vibration during high-speed railway running on a bridge, large-scale civil engineering, and construction work by the damping effect of the structural material itself, and having sufficient toughness as a structural member is attempted. It is a thing.

Conventional iron-based materials used as members for the purpose of damping property instead of resin sandwich type damping steel plate are high in hysteresis due to irreversible motion of domain wall movement under the action of alternating stress due to vibration. In order to obtain a damping property, a ferrite former is added to make the structure into a ferrite single phase, and it is divided into two types: a material to which Al and Si are added and a material to which Cr is positively added.

As an example of the former, Japanese Patent Laid-Open No. 4-99148
As disclosed in Japanese Patent Publication No. 52-73118, there is a ferromagnetic damping alloy in which Al is added up to 7.05% and Si is added up to 4.5%. As described in 1), there is a ferromagnetic damping alloy containing 8 to 30% of Cr.

Further, in JP-A-6-220583 and JP-A-5-302148, there is disclosed a ferromagnetic damping alloy in which Mn is 0.1 or 0.2% or less and 1 to 5% of Cr is added. is there. In addition, the inventors of the present invention filed Japanese Patent Application No. 6-2589.
No. 82 proposed a ferromagnetic damping alloy in which Mn is added in an amount of 0.2 to 2.5% and Cr is added in an amount of 1 to 5%.

Ryohei Tanaka, Damping Material <Functions and Applications> Published by Kousendo March 1992, p192 to 197, as a ferromagnetic alloy, external stress causes movement of the magnetic domain wall, which causes hysteresis energy to cause vibration energy. Described to be absorbed.

[0007]

However, among these alloys, the alloy described in Japanese Patent Laid-Open No. 4-99148 has an inappropriate upper limit regulation of the amounts of Al and Si to be added, and therefore the coarse Al-based and Si-based alloys. This causes the formation of inclusions, which act as the starting point of fracture, resulting in a decrease in toughness.
Further, the alloy described in JP-A-52-73118 is Cr
Since the addition is excessive, similarly to the above, the toughness is lowered by the Cr-based inclusions.

Further, in JP-A-6-220583 and JP-A-5-302148, the toughness is low because no aggressive measures for improving the toughness are taken. In addition, Japanese Patent Application Hei 6
No. 258982 has insufficient toughness because it has priority on securing toughness.

In the literature of damping materials, the mechanism of damping alloys is written, and there is no description on the improvement method, specific component system, manufacturing method, or method for simultaneously satisfying toughness in addition to damping property. . An object of the present invention is to provide a damping alloy having excellent damping properties and damping properties and high toughness.

[0010]

The gist of the present invention is as follows. (1)% by weight, C: 0.02% or less, Si: 0.01
% Or more and 0.5% or less, Mn: less than 0.2%, P: 0.
010% or less, S: 0.005% or less, Cr: 0.5%
Or more, 3.5% or less, Al: 0.002% or more, 0.0
60% or less, N: 0.006% or less, balance Fe
And a (200) diffraction intensity ratio of 3.0 or more, and a damping alloy.

(2)% by weight, C: 0.02% or less, S
i: 0.01% or more and 0.5% or less, Mn: 0.2% or more and 2.5% or less, P: 0.010% or less, S: 0.0
05% or less, Cr: 0.5% or more, 3.5% or less, A
1: 0.002% or more, 0.060% or less, N: 0.0
A vibration-damping alloy, which contains 06% or less, consists of the balance Fe and unavoidable impurities, and has a (200) diffraction intensity ratio of 2.5 or more.

(3) Cu: 0.05 to 2.5 by weight%
%, Ni: 0.05-2.5%, Mo: 0.05-4.
5%, Nb: 0.005 to 0.2%, V: 0.005 to
0.2%, Ti: 0.005 to 0.1%, B: 0.00
The vibration damping alloy as described in any one of (1) and (2) above, which contains one or two or more of 03 to 0.005%.

(4)%: Ca: 0.001 to 0.
05%, REM: 0.001 to 0.1% 1 or 2
The damping alloy according to any one of (1) to (3) above, which contains a seed. (5) The damping alloy according to any one of (1) to (4) above, wherein high toughness is ensured by setting the crystal grain size to 120 μm or less.

(6) The heating temperature is 1000 to 1150 ° C.,
After the hot rolling at a rolling reduction temperature of 950 ° C or lower at 30 to 70% and a rolling finishing temperature of 850 ° C or lower, it is cooled to room temperature,
The method for producing a vibration damping alloy according to any one of (1) to (5) above, which comprises performing a tempering or an annealing heat treatment at 1000 ° C.

(7) Rolling finishing temperature range is 650-85
The above (6), which is characterized in that hot rolling is performed at 0 ° C.
A method for producing the damping alloy described. (8) Roll finishing temperature range is Ar ₁ -20 ° C to Ar ₁ +
The method for producing a vibration damping alloy as described in any of (6) and (7) above, which comprises performing hot rolling at 50 ° C.

[0016]

The present invention has been made in view of the above circumstances, and in order to obtain a high damping property due to the hysteresis due to the irreversible motion of the domain wall movement under the action of alternating stress due to vibration, It is based on pure iron-based components in which the elements that cause harmful harmful elements, inclusions, and precipitates, interfere with domain wall movement, and greatly impair vibration damping are minimized.

Further, in the past, since the crystal grain boundary hindered the domain wall movement, the vibration damping property was improved only by coarsening the grain. However, as a result of various studies by the inventors, the vibration damping by the coarsening has been performed. As an alternative to the method for improving the vibration resistance, it has been found that the vibration damping property is significantly improved by increasing the (200) diffraction intensity. By increasing the (200) diffraction intensity, the <100> orientation parallel to the steel sheet surface is strengthened.

That is, the easy magnetization direction is strengthened in the direction parallel to the steel plate surface. It is a new discovery that the damping property is improved by strengthening the easy magnetization direction. This (200)
It was found that the vibration damping property is improved by setting the diffraction intensity ratio to 2.5 or more. When the (200) diffraction intensity ratio is 2.5 or more, the loss coefficient, which is an index of damping property, can be secured to be 0.02 or more. From the viewpoint of damping performance, (2
The higher the (00) diffraction intensity ratio, the better, but in view of the balance with other steel material properties such as toughness, the (200) diffraction intensity ratio is preferably in the range of 2.5 to 12.0, resulting in 0.02 to 0. It is preferable to ensure a loss factor of 0.055.

Here, the (200) diffraction intensity ratio is (200) at a quarter thickness position in the plate thickness direction by X-ray diffraction.
The diffraction intensity was measured and the ratio to the (200) diffraction intensity of the random sample material in which the specific orientation was not strengthened or controlled was determined. As a result of this study, the maximum value of the (200) diffraction intensity ratio was about 15.

In order to increase the (200) diffraction intensity ratio, it is necessary to carry out low temperature rolling, and as a result of examination, 95
This can be achieved by setting the rolling reduction at 0 ° C. or less to 30% or more. Regarding the upper limit of the low temperature rolling temperature, alloy components, especially M
It is necessary to limit by n, and 950 ° C. may be used when Mn is less than 0.2%, but 90 when Mn is 0.2% or more.
Must be 0 ° C. Therefore, the rolling finishing temperature is 85
It will be below 0 ° C.

However, Mn is 0.2% or more, and 900
The rolling finishing temperature in the case of low-temperature rolling below ℃ must be below 800 ℃. Furthermore, as a result of a detailed study for improving the vibration damping property, the rolling finish temperature was set to Ar ₁ -20 ° C to A
It has been found that by setting r ₁ + 50 ° C., the (200) diffraction intensity ratio is further improved and the vibration damping property is further improved.

Further, Mn was found as an element capable of significantly increasing the strength without impairing the vibration damping property and the toughness. By adding 0.2% or more of Mn, it is possible to achieve both vibration damping property and strength, or to improve three properties of vibration damping property, strength and toughness.

Next, in order to improve the toughness, the crystal grain size is set to 12
It is necessary to make it 0 μm or less. When the rolling finishing temperature is lower than 650 ° C. in the manufacturing method for setting the (200) diffraction intensity ratio to 2.5 or higher, the crystal grain size may exceed 120 μ, so the rolling finishing temperature is set to 650 ° C. or higher. However, if Mn is less than 0.2%, the grain size may exceed 120μ unless the rolling finishing temperature is 700 ° C or higher, and therefore the temperature must be 700 ° C or higher.

After hot rolling, tempering or annealing heat treatment is necessary in order to increase the (200) diffraction intensity ratio and reduce the strain introduced into the steel sheet by rolling. The upper limit temperature is 1000 ° C. because the diffraction intensity ratio becomes low. However, Mn is 0.2
When it is at least%, the (200) diffraction intensity ratio may be low, so it is preferable to set 950 ° C. to the upper limit.

As described above, the vibration damping property is improved by introducing the texture even in the fine grain structure, and further improvement of the vibration damping property was examined. As a result, it was found that the addition of Cr, which is a ferrite former, achieves some coarse grains in the process of strain relief heat treatment after hot rolling and further improves the vibration damping property. The addition of Cr also increases the strength.

Next, the reasons for limitation of the present invention will be described. Since C acts as an obstacle to the movement of the domain wall even if it is in a solid solution state or is precipitated as a carbide and reduces the vibration damping property, the lower the C is, the more preferable the upper limit is 0.02%.

Since Si is important as a deoxidizing material,
It is necessary to add more than 01%, but if added over 0.5%, it acts as an obstacle to domain wall movement in a solid solution state to lower the vibration damping property, so the upper limit is made 0.50%.

Since Mn is a solid solution strengthening element, it has no effect on improving the vibration damping property and toughness, and if it is added in an amount more than necessary for deoxidation, it only increases the cost.
Except when high strength of MPa or more is required, it is preferable to limit it to less than 0.2%. In particular, when high strength of 380 MPa or more is required, Mn is an element that fixes deoxidation and S to suppress grain boundary embrittlement and at the same time enhances strength without degrading vibration damping and toughness with solid solution strengthening elements. Because
It is preferable to add 0.2% or more of Mn. However, 2.5%
If added in excess of 0.1%, the damping property will decrease, so the upper limit for the amount of Mn added is 2.5%.

P and S form a non-metallic inclusion in the steel and segregate to impede the movement of the magnetic domain wall to lower the vibration damping property. Therefore, P is set to 0.010% or less and S is set to 0.005% or less.

Al, like Si and Mn, is an important element as a deoxidizing material, and is an important element for improving vibration damping property and strength. Although it is necessary to secure at least 0.002%, excessive addition causes inclusions such as Al ₂ O ₃ and compounding with N to form precipitates such as AlN, resulting in deterioration of vibration damping and toughness. Therefore, the upper limit is limited to 0.060%.

Cr is a ferrite former, which is an element which causes the crystal grains to become slightly coarser when added, and is added in an amount of 0.5% or more in order to improve the vibration damping property, but at the same time, it causes a decrease in toughness. Since it is an expensive element and it is preferable to reduce the added amount as much as possible, the upper limit is limited to 3.5% or less.

N, which acts as an obstacle to the movement of the domain wall even if it is in a solid solution state or precipitates as a nitride, lowers the vibration damping property, so that it is preferably as low as possible, and the upper limit is made 0.006%. Furthermore, Cu, Ni, Mo, Nb, which is added as necessary,
V, Ti, and B are elements effective in increasing strength, and the above amount was set as the lower limit as a range in which the effect is not insufficient, and the above amount was set as the upper limit as the range in which the vibration damping property and toughness were not deteriorated.

Further, Ca, R added as necessary
EM is an element effective for improving the toughness, and the above amount was set as the lower limit as a range in which the effect was not insufficient, and the above amount was set as the upper limit as the range in which the toughness was not lowered and the vibration damping property was not lowered.

Regarding the manufacturing conditions, the heating temperature is 1150 ° C. or lower in order to make the heated austenite grains fine and the (200) diffraction intensity ratio is high, and further 1000 ° C. or higher in order to eliminate the temperature deviation in the steel sheet during heating. And

Regarding the rolling conditions, in order to increase the (200) diffraction intensity ratio, it is necessary to carry out low-temperature rolling and the rolling reduction at that time to be 30% or more. From the experimental results, the upper limit of the temperature range of the low temperature rolling is 950 ° C. when Mn is less than 0.2%, and it is necessary to carry out at a lower temperature of 900 ° C. or less when Mn is 0.2% or more. .

In the range below these temperatures, the rolling reduction is 3
Rolling of 0% or more is required, but if the reduction ratio exceeds 70%, the load on the rolling mill becomes large, and the rolling time becomes long, which causes a cost increase, so the upper limit is 70%.
And

The rolling finishing temperature is 850 ° C. (800 ° C. when Mn is 0.2% or more) because the rolling with a rolling reduction of 30% or more is performed in the low temperature rolling under the above conditions, but 70
If the temperature is lower than 0 ° C (650 ° C when Mn is 0.2% or more), the ferrite region is rolled, the grain size may exceed 120μ, and the toughness may decrease, so the lower limit is 700 ° C (M
If n is 0.2% or more, the temperature is 650 ° C.). further,
Improved finish rolling temperature (200) by the _{Ar 1 -20 ℃ ~Ar 1 + 50} ℃ diffraction intensity ratio further damping characteristics are further improved.

After hot rolling and cooling to room temperature, (20
0) Tempering or annealing heat treatment is required to further improve the diffraction intensity ratio and reduce the strain introduced into the steel sheet by rolling. If Mn is 0.2% or more, 650 ° C. or more, Mn Is less than 0.2% 700
Although the heat treatment is performed at a temperature of ℃ or more, the (200) diffraction intensity ratio becomes weak when heat treatment is performed at a high temperature.
In order to improve the (200) diffraction intensity ratio in the case of less than 100%, 1000 ° C. (950 in the case of Mn of 0.2% or more).
° C).

The relationship between the heat treatment temperature range and the (200) diffraction intensity ratio also depends on the Mn content of the alloy. When Mn is less than 0.2%, the temperature range of 700 ° C. to 1000 ° C. is good, and Mn is In the case of 0.2% or more, 650 to 950 ° C
The heat treatment in the temperature range is preferable.

[0040]

[Examples] Matching alloys having the ranges of components shown in Table 1 were prepared, and a plate-shaped test piece having an original thickness of 40 mm and a width of 400 mm was processed, and the vibration damping property was measured by the mechanical impedance method. . Steels A1 to A5 and B1 to B5 among the alloys shown in Table 1
Is an alloy in the composition range of the present invention, and includes steels F1 to F8 and G.
1 to G10 are alloys outside the composition range of the present invention. A1
A5 and F1 to F8 are low Mn and less than 0.2%, B
1 to B5 and G1 to G10 are high Mn and 0.2 to 2.5%
belongs to. The various properties of these steels produced under the production conditions shown in Table 2 are also shown in the table. Each steel sheet having a thickness of 6 mm or more was hot-rolled, cooled to room temperature, and then heat-treated. Those having a plate thickness less than that were hot-rolled, wound, and then heat-treated.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

[Table 4]

Examples 1 to 12 are examples of the present invention, and Examples 13 to 3 are
8 is a comparative example. Examples 1-3 and 13-19 have a plate thickness of 25 m
m, Example 4 is 2.3 mm thick, Examples 5 and 6 are 50 mm thick, Example 7
~ 9,25 ~ 32 is 24mm thick, Example 10 is 2.2m thick
m, Examples 11 and 12 have a plate thickness of 32 mm, Examples 20 to 24 have a plate thickness of 1
5 mm, Examples 33 to 38 have a plate thickness of 18 mm.

Looking at the low Mn materials of Examples 1 to 6,
The inventive example of Example 1 has a (200) diffraction intensity ratio of 3.0 or more and high vibration damping performance (η ≧ 0.025). Example 2
No. 6 has a rolling finish temperature of 700 ° C or higher, and (200)
The diffraction intensity ratio is 3.0 or more, the crystal grain size is 120 μ or less, and high vibration damping performance (η ≧ 0.025) and high toughness (≧ 8
0J). Since Examples 3 and 4 contain the selective element effective for increasing the strength, the strength is higher, and Examples 5 and 6 contain the selective element effective for increasing the toughness, and therefore the higher toughness (≧
100J).

Next, looking at the high Mn materials of Examples 7 to 12, the invention example of Example 7 has a (200) diffraction intensity ratio of 2.5.
With the above, with high strength (≧ 380 MPa), high vibration damping performance (η ≧
0.020). In Examples 8 to 12, the rolling finishing temperature was 650 ° C. or higher, the (200) diffraction intensity ratio was 2.5 or higher, the crystal grain size was 120 μ or less, and the high strength (≧ 38).
It has high vibration damping performance (η ≧ 0.020) and high toughness (≧ 80 J) at 0 MPa.

Since Examples 9 and 10 contain a selective element effective for increasing strength, Example 1 has higher strength (≧ 410 MPa).
Since 1 and 12 contain selective elements effective for increasing toughness,
Further, it has high toughness (≧ 100 J).

Looking at Comparative Examples 13 to 24 having low Mn, Comparative Example 13 has a (200) diffraction intensity ratio of 3.0 or more, but has a crystal grain size of more than 120 μm, a high C, and is excellent in vibration damping performance and toughness. Low. In Example 14, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less, but Si is low and the vibration damping performance is low.

In Examples 15 and 16, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less.
5 has a high P and Example 16 has a high S, and the vibration damping performance is low. In Example 17, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less, but Cr is low and the vibration damping performance is low. In Example 18, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less, but the Cr content is high and the toughness is low.

In Example 19, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less, but Al is high,
Vibration control and toughness are low. In Example 20, the (200) diffraction intensity ratio is 3.0 or more and the crystal grain size is 120 μ or less, but N is high and the vibration damping performance is low. Example 21 has a high heating temperature, and Example 2
No. 2 has a low rolling reduction at 950 ° C. or lower, a low (200) diffraction intensity ratio, a crystal grain size of more than 120 μm, and low vibration damping performance and toughness.

In Example 23, the heat treatment temperature is low, the (200) diffraction intensity ratio is low, and the crystal grain size is 120 μ or less, but the vibration damping performance is low. In Example 24, the heat treatment temperature was high and the crystal grain size was 120 μm or less, but the (200) diffraction intensity ratio was low,
Vibration control performance is low.

On the other hand, looking at the comparative example of high Mn, the comparative example 25 has a (200) diffraction intensity ratio of 2.5 or more, but has a crystal grain size of more than 120 μ, high C, and low vibration damping performance and toughness. . In Example 26, the (200) diffraction intensity ratio is 2.5 or more and the crystal grain size is 120 μ or less, but Si is high and the vibration damping performance is low. In Example 27, the (200) diffraction intensity ratio is 2.5 or more and the crystal grain size is 120 μ or less, but the Mn is low and the intensity is low.

Example 28 has a (200) diffraction intensity ratio of 2.5 or more and a crystal grain size of 120 μ or less, but has a high Mn,
Vibration control performance is low. Examples 29 and 30 have a (200) diffraction intensity ratio of 2.5 or more and a crystal grain size of 120 μ or less, but Example 29 has a high P, Example 30 has a high S, and the vibration damping performance is low.
In Example 31, the (200) diffraction intensity ratio is 2.5 or more and the crystal grain size is 120 μ or less, but Cr is low and the strength and vibration damping performance are low. Example 32 has a (200) diffraction intensity ratio of 2.5 or more and a crystal grain size of 120 μ or less, but has high Cr and low toughness.

In Example 33, the (200) diffraction intensity ratio is 2.5 or more and the crystal grain size is 120 μ or less, but Al is high,
Low toughness. In Example 34, the (200) diffraction intensity ratio is 2.5 or more and the crystal grain size is 120 μ or less, but N is high and the vibration damping performance is low. Example 35 has a high heating temperature, and Example 36 has 90
The rolling reduction at 0 ° C. or lower is low, the (200) diffraction intensity ratio is low, the crystal grain size is more than 120 μm, and the vibration damping performance and toughness are low.

In Example 37, the heat treatment temperature was low and the grain size was 1
Although it is 20 μ or less, the (200) diffraction intensity ratio is low and the vibration damping performance is low. In Example 38, the heat treatment temperature was high, the crystal grain size was 120 μm or less, but the (200) diffraction intensity ratio was low,
Vibration control performance is low.

Next, with respect to the steels P1, P2, Q1, Q2, R1 and R2 of the alloys in the composition range of the present invention shown in Table 3, Table 4 is shown.
Various characteristics of the product manufactured under the manufacturing conditions of the present invention shown in are also shown. P1, Q1 and R1 are low Mn less than 0.2%
Steel, P2, Q2 and R2 are high Mn steels of 0.2% or more and 2.5% or less. Examples 39 to 41 and Examples 45 to 47 are examples in which the rolling finishing temperature is in a more desirable range. Examples 39-4
1 has a thickness of 25 mm, and Examples 45 to 47 have a thickness of 20.
mm. Ar ₁ of steels P1, Q1 and R1 is 73 respectively.
A of steels P2, Q2 and R2 at 0 ℃, 755 ℃ and 725 ℃
r ₁ is 695 ° C., 700 ° C., and 690 ° C., respectively.

[0058]

[Table 5]

[0059]

[Table 6]

[0060]

[Table 7]

In Examples 39 to 41 and Examples 45 to 47, the rolling finishing temperature was in the range of Ar ₁ + 50 ° C. to Ar ₁ -20 ° C., and the (200) diffraction intensity ratio was 4.0 or more, and further excellent control was obtained. Vibration performance (η ≧ 0.03) and rolling finish temperature is A
Examples 42 to 4 not in the range of r ₁ + 50 ° C. to Ar ₁ −20 ° C.
4 and Examples 48 to 51 have better vibration damping performance.

[0062]

According to the present invention, it is possible to provide a steel having a (200) diffraction intensity ratio of 2.5 or more (loss coefficient of 0.02 or more) and excellent vibration damping performance. In addition to the vibration control performance, the steel has at least one of high toughness of absorbed energy at 0 ° C of ≧ 80 J in V notch Charpy impact test or high strength of tensile strength ≧ 380 MPa or more at the same time. Ships, bridges,
It becomes possible to supply industrial machinery and structural materials for construction, and the effect on the industry is extremely large.

Claims (8)

[Claims] 1. By weight%, C: 0.02% or less, Si: 0.01% or more, 0.5% or less, Mn: less than 0.2%, P: 0.010% or less, S: 0 0.005% or less, Cr: 0.5% or more, 3.5% or less, Al: 0.002% or more, 0.060% or less, N: 0.006% or less, balance Fe and unavoidable impurities And a (200) diffraction intensity ratio of 3.0 or more. 2. By weight%, C: 0.02% or less, Si: 0.01% or more, 0.5% or less, Mn: 0.2% or more, 2.5% or less, P: 0.010. % Or less, S: 0.005% or less, Cr: 0.5% or more, 3.5% or less, Al: 0.002% or more, 0.060% or less, N: 0.006% or less, A vibration-damping alloy comprising the balance Fe and unavoidable impurities and having a (200) diffraction intensity ratio of 2.5 or more. 3. By weight%, Cu: 0.05 to 2.5%, Ni: 0.05 to 2.5%, Mo: 0.05 to 4.5%, Nb: 0.005 to 0. 2%, V: 0.005-0.2%, Ti: 0.005-0.1%, B: 0.0003-0.005%, 1 type (s) or 2 or more types are contained, It is characterized by the above-mentioned. The vibration damping alloy according to item 1 or 2. 4. The composition according to any one of claims 1 to 3, wherein the content of Ca is 0.001 to 0.05%, and REM is 0.001 to 0.1% by weight. Damping alloy described in Crab. 5. The vibration damping alloy according to claim 1, wherein a high toughness is ensured by controlling the crystal grain size to 120 μm or less. 6. A heating temperature of 1000 to 1150 ° C., 95
The rolling reduction at 0 ° C or lower is 30 to 70%, and the rolling finishing temperature is 85.
After hot rolling at 0 ° C or lower, cooling to room temperature, 650 to 10
The method for producing a vibration damping alloy according to any one of claims 1 to 5, characterized by performing tempering or annealing heat treatment at 00 ° C. 7. A rolling finishing temperature range of 650 to 850 ° C.
The method for producing a vibration-damping alloy according to claim 6, wherein hot rolling is performed. 8. A rolling finishing temperature in a range of Ar ₁ -20 ° C.
The method for producing a vibration damping alloy according to claim 6 or 7, wherein hot rolling is performed at Ar ₁ + 50 ° C.