JPS623826A - Production of wide width composite damping steel plate - Google Patents

Abstract

PURPOSE:To enable the production of a wide and thin composite damping steel plate by dispersing steel fibers between each cladding face of >=3 sheets of steel plates and after coating a release agent by welding the peripheral edge part leaving the one part and by rolling it after the heat treatment. CONSTITUTION:The steel fiber 3 dispersed between the cladded face of steel plates 2a-2c adheres partially the cladded face, prevents the unevenness in the elongation in the rolling direction of each steel plate 2a-2c and the generation of a bulging in rolling. The shape of the steel fiber 3 is made in a polygon at its cross section of a rectangular or triangle shape, etc. so as to make an adhesive state partially by biting onto the surface of the steel plate while rolling. A release agent 4 prevents the adhesion of the steel plate each other in case of rolling. The reason why the welding is performed by leaving one part of the peripheral edge of the steel plate is because of the residual air between the cladded faces being escaped in rolling. And after rolling the welded part on the peripheral edge is removed after fixing the steel plate each other with a spot welding 7 at plural places if necessary.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、鋼板を３枚以上重ね合せて、その相互の接触
面の摩擦作用によって振動を吸収する複合制振鋼板のう
ち、広幅の制振鋼板の製造方法に関する。Detailed Description of the Invention: Industrial Field of Application The present invention relates to a wide vibration damping steel plate among composite vibration damping steel plates that absorb vibration by the frictional action of the mutual contact surfaces of three or more steel plates stacked one on top of the other. Relating to a manufacturing method.

従来の方法 従来建設機械や船舶、車輌等の振動ならびに騒音を忌避
する個所に使用される制振材料には、防振合金もしくは
複合型制娠仮が主として使用されている。しかしながら
前者は単体で無負荷状態において用いる場合には、良好
な性能を示すが、強度部材として構造物に組込んで使用
する場合には、静荷重もしくは溶接施工による残留応力
か負荷されることによりその制振効果が消失する場合が
多い。また防振合金の種類としてはマグネシウム、片状
黒鉛鋳鉄、１２％Ｃｒ＠、Ｃｕ−Ｍｎ合金、Ｆｃ−Ｃｒ
−Ａ、ｆｆ合金等があるが、溶接性に乏しく、かつ高価
であるために、広く一般に使用しガｔい。Conventional Method Conventionally, vibration-proofing alloys or composite damping materials have been mainly used as vibration-damping materials used in areas where vibration and noise are to be avoided, such as in construction machines, ships, and vehicles. However, when used alone under no-load conditions, the former exhibits good performance, but when incorporated into a structure as a strength member, static loads or residual stress due to welding work are applied. The damping effect often disappears. The types of anti-vibration alloys include magnesium, flake graphite cast iron, 12%Cr@, Cu-Mn alloy, Fc-Cr
-A, ff alloys, etc., but they have poor weldability and are expensive, so they are not widely used.

また後者には粘弾性を「する合成樹脂と鋼板とを組合せ
た複合板等があり、構造物に組入れた場合の制振効果を
存するので、自動車部品等には使用されているが、４１
機物である合成樹脂から構成されているために溶接施工
が困難であり、また強度部材としても断面積当りの特性
が劣化し、しかもこの種の材料は経年変化を伴うので、
たとえば船舶甲板やボイラー煙道等の苛酷な使用条件の
構造物に使用するには不適当である。The latter includes composite plates made by combining synthetic resins with viscoelasticity and steel plates, which have a vibration damping effect when incorporated into structures and are used in automobile parts, etc.
Because it is made of synthetic resin, it is difficult to weld, and as a strength member, its properties per cross-sectional area deteriorate, and this type of material deteriorates over time.
For example, it is unsuitable for use in structures subject to severe usage conditions, such as ship decks and boiler flues.

本発明者らは、上記従来の各種制振材料の諸欠点を解消
すべく、特願昭５９−１５８４８７号および特願昭５９
−１５’８４８８号において提案したように、２枚以上
の鋼板を重ね合せ、少なくとも外側の２枚の鋼板同志と
複数箇所で溶接固着してなり、溶接施工が可能で、負荷
状態で優れた制振機能を存し、構造物に組込んで使用出
来る複合制振鋼板を開発し著効を得た。In order to eliminate the various drawbacks of the above-mentioned conventional vibration damping materials, the present inventors have proposed Japanese Patent Application No. 59-158487 and Japanese Patent Application No.
-As proposed in No. 15'8488, two or more steel plates are stacked one on top of the other and fixed by welding to at least the two outer steel plates at multiple points, which enables welding and provides excellent control under load conditions. We have developed a composite vibration-damping steel plate that has a vibration function and can be used by incorporating it into structures, and has achieved remarkable results.

発明が解決しようとする問題点 複合制振鋼板において、制振性能のみならず重量の軽減
をも要求される場合があり、最終厚さが６〜１５ｍ■程
度の鋼板に対する需要が多い。例えば鋼板を３枚重ねて
なる上記複合制振鋼板はずぐれた制振性能を存するが、
最終厚さを６〜１５軸とするには複合制振鋼板を構成す
る鋼板１枚の厚さを複合制振鋼板の最終厚さに応じて２
〜５１．とすることが必要になる。このような条件を満
たず複合制振鋼板を厚板工場で製造される３、　０００
〜４、５００　ａｍ程度の広幅の鋼板として製作しよう
とすると、従来用いられている複数の被圧延材を重ね合
せて圧延する方法では、重ね合せ材の圧延方向の延びが
外側と中央部とで異ることに起因して、ふくれ吠の平坦
度不良が生じ易いという問題がある。この傾向は制振性
能がよくなるように外側の鋼板を中央にはさんだ鋼板よ
りも薄くしたときに特に著しい。Problems to be Solved by the Invention In composite vibration-damping steel plates, there are cases where not only vibration-damping performance but also weight reduction is required, and there is a great demand for steel plates with a final thickness of about 6 to 15 m. For example, the above-mentioned composite vibration-damping steel plate made by stacking three steel plates has excellent vibration-damping performance,
In order to set the final thickness to 6 to 15 axes, the thickness of one steel plate constituting the composite vibration damping steel plate should be adjusted to 2.
~51. It becomes necessary to do so. 3,000 composite damping steel plates are manufactured at a plate factory without meeting these conditions.
When attempting to manufacture a wide steel plate of approximately 4,500 am, the conventional method of stacking and rolling multiple rolled materials results in the extension of the stacked materials in the rolling direction being between the outside and the center. Due to this difference, there is a problem in that poor flatness of the burble is likely to occur. This tendency is particularly noticeable when the outer steel plate is made thinner than the central steel plate to improve vibration damping performance.

本発明は上記の問題を解決することを目的とする。The present invention aims to solve the above problems.

問題点を解決するための手段 本発明は３枚以上の鋼板を重ね合せた複合制振鋼板を製
造するにあたり、鋼板の各合せ面の間にスチールファイ
バーを略均等に分散するとともに？り離削を吹布した後
、上記重ね合せ鋼板の周縁部を一部残して溶接し、加熱
処理を施し、圧延した後必要に応じて重ね合せた鋼板同
志を複数箇所で溶接固着し、上記周縁溶接部を除去して
制振鋼板とすることを要旨とする広幅複合制振鋼板の製
造方法に関する。Means for Solving the Problems In manufacturing a composite vibration-damping steel plate made by laminating three or more steel plates, the present invention distributes steel fibers approximately evenly between each mating surface of the steel plates. After applying abrasive coating, weld the stacked steel plates, leaving a part of the periphery, heat-treated, and then roll the stacked steel plates.If necessary, the stacked steel plates are welded and fixed at multiple locations. The present invention relates to a method for manufacturing a wide composite vibration damping steel plate, the gist of which is to remove the peripheral welds to produce a vibration damping steel plate.

第１図は、本発明による広幅複合制振鋼板の製造におけ
る圧延時の状況の一例を示す説明図である。同図におい
て、被圧延材（１）はスラブあるいは厚鋼板（２ａ）と
（２ｂ）および（２ｂ）と（２ｃ）との合せ面にスチー
ルファイバー（３）を略均等に分散し、？す離削（４）
を全面に塗布し、周縁部を溶接固着（図示せず）したも
ので、該被圧延材（１）を厚板圧延機で圧延する。（５
ａ）、（５ｂ）はワークロール、（６ａ）、（６ｂ）は
バックアップロールである。FIG. 1 is an explanatory diagram showing an example of a rolling situation in manufacturing a wide composite damping steel plate according to the present invention. In the same figure, the material to be rolled (1) is a slab or thick steel plates (2a) and (2b), and steel fibers (3) are almost evenly distributed on the mating surfaces of (2b) and (2c). Disassembly (4)
The material to be rolled (1) is coated on the entire surface and fixed by welding at the peripheral edge (not shown).The material to be rolled (1) is rolled in a plate rolling mill. (5
a) and (5b) are work rolls, and (6a) and (6b) are backup rolls.

スチールファイバー（３）の形状は圧延中上下合せ面へ
の接着性か良好となるように断面形状が矩形あるいは三
角形等多角形であることか望ましく、したがって鋼板を
短１ｌｌＩｖＳに切断する方法やビンット等を旋盤を用
いて切削し、断面形状か三角形となるような加工方法を
用いて製作する。スチールファイバー（３）の断面積は
あまり小さいと上下合せ面への接着力が小さく、圧延中
に９１１離が生じて、その後の圧延でぶ、くれが発生し
、逆に大きすぎると合せ面の接着面積比率が大きくなり
、制振性能を劣化させるので、０．１〜２ｄとすること
が必要である。また、スチールファイバー（３）の長さ
は短かすぎると同様の理由で圧延の際ふくれが発生し長
ずざると制振性能が劣化するので、２〜５０讃嘗とする
ことが必要である。上記のスチールファイバー（３）を
合せ面の間に分散する散布密度は、例えば断面寸法が１
１角で長さ５富−のスチールファイバー（３）の場合、
１♂あたり４００〜３．０００本捏度とすることが望ま
しい。１♂あたり４００本末清では上下合せ面の接着力
が十分でなく、圧延により局面的なふくれが発生し、ま
た３、　０００本捏度以上となると制振性能が劣化する
。The shape of the steel fiber (3) is preferably rectangular or polygonal such as a triangle in order to have good adhesion to the upper and lower mating surfaces during rolling. It is manufactured by cutting it using a lathe and using a processing method that creates a cross-sectional shape or a triangle. If the cross-sectional area of the steel fiber (3) is too small, the adhesion to the upper and lower mating surfaces will be weak, resulting in 911 separation during rolling, and subsequent rolling bumps and cracks.On the other hand, if it is too large, the adhesion between the mating surfaces will be poor. Since the area ratio becomes large and the damping performance deteriorates, it is necessary to set it to 0.1 to 2 d. In addition, if the length of the steel fiber (3) is too short, blistering will occur during rolling for the same reason, and if it is not long, the damping performance will deteriorate, so it is necessary to set it to 2 to 50 cm. . The above-mentioned steel fiber (3) is dispersed between the mating surfaces at a dispersion density such that the cross-sectional dimension is 1
In the case of a steel fiber (3) with one angle and a length of 5 mm,
It is desirable to knead 400 to 3,000 threads per male. If the rolling strength is 400 strands per male, the adhesion between the upper and lower mating surfaces will not be sufficient and localized blistering will occur due to rolling, and if the rolling strength exceeds 3,000 strands, the damping performance will deteriorate.

剥離剤（４）は圧延の際に鋼板同志が接着するのを防止
するために必要なものであり、例えばアルミナを添加し
たデキストリン分散液を合せ面に塗布した後、乾燥させ
たものを用いる。塗布量は乾燥後２００〜３００μ程度
の厚さとなるようにすることが望ましく、これ以下の厚
さでは圧延中に合せ面で部分的に接着が生じ制振性能が
低下する。The release agent (4) is necessary to prevent the steel plates from adhering to each other during rolling, and for example, a dextrin dispersion containing alumina is applied to the mating surfaces and then dried. It is desirable that the coating amount is about 200 to 300 μm after drying; if the thickness is less than this, adhesion will occur partially on the mating surfaces during rolling, resulting in a decrease in vibration damping performance.

周縁部を溶接するのは重ね合せた鋼板（２ａＸ２ｂＸ２
ｃ）が圧延中に分離しないようにするためであるが、周
囲を完全に溶接固着するのではな（、−辺で１〜２ケ所
程度未溶接部を設は合せ面の間に残存している空気が圧
延中逃げられるようにしておくことが必要である。The peripheral edges are welded using superimposed steel plates (2aX2bX2
This is to prevent c) from separating during rolling, but the periphery should not be completely welded and fixed (there should be one or two unwelded parts on the - side, or there should be one or two unwelded parts remaining between the mating surfaces). It is necessary to allow the air present to escape during rolling.

上記のように製作した鋼板の積層体である被圧延材（１
）に所定の加熱処理を施し、第１図に示したように厚板
圧延機で所定の板幅および板厚に圧延し、次いで重ね合
せた鋼板同志を複数箇所でスポット溶接等により固着し
た後、周縁の溶接部分を除去し広幅複合制振鋼板とする
。第２図は鋼板の合せ面の固着をスポット６接（７）で
行なった場合の断面もが成因である。ただ必ずしも重ね
合せた鋼板をすべて同一点で互に固着する必要はなく、
隣接する２枚、例えば第２図の鋼板（２ａ）と（２ｂ）
を互に固着し、また他の場所で鋼板（２ｂ）と（２Ｃ）
を固着する、いわゆる２枚間のスポット溶接を重ね合せ
た鋼板の表裏両面から複数箇所で行なうこともできる。The rolled material (1
) is subjected to a prescribed heat treatment, rolled to a prescribed plate width and thickness in a plate rolling mill as shown in Figure 1, and then the stacked steel plates are fixed together at multiple locations by spot welding, etc. , remove the welded parts on the periphery to create a wide composite damping steel plate. FIG. 2 shows the cross section when the mating surfaces of the steel plates are fixed by spot 6 contact (7). However, it is not necessarily necessary to fix all the stacked steel plates to each other at the same point.
Two adjacent steel plates, for example, steel plates (2a) and (2b) in Fig. 2
are fixed to each other, and steel plates (2b) and (2C) are attached at other locations.
It is also possible to perform so-called spot welding between two sheets at a plurality of locations on both the front and back sides of the stacked steel sheets.

本発明法により製造した複合制振鋼板では、合せ面に介
在するスチールファイバーが圧延中に重ね合せた鋼板の
表面にくい込んで該鋼板の合せ面を部分的に接着した状
態となるので、溶接による固着箇所を減らすか、場合に
よっては全く省略することもできる。In the composite damping steel plate manufactured by the method of the present invention, the steel fibers interposed in the mating surfaces sink into the surface of the superimposed steel plates during rolling, resulting in a state where the mating surfaces of the steel plates are partially bonded. The number of fixing points can be reduced or, in some cases, omitted altogether.

作　　　　　　　　　　用　　・ 上記の広幅複合制振鋼板の製造においては、スチールフ
ァイバーが鋼板の合せ面の間に分散され該スチールファ
イバーが合せ面を部分的に接着し、各鋼板の圧延方向へ
伸びの不均一を生じさせないようにして圧延中のふくれ
の発生を防止する。スチールファイバーの形状は、該ス
チールファイバーのコーナ一部が圧延中鋼板の表面に（
い込んで部分的に接着した伏匹となるように、断面形状
が矩形あるいは三角形等の多角形であることが望ましい
。Function - In the production of the above-mentioned wide composite vibration-damping steel plates, steel fibers are dispersed between the mating surfaces of the steel plates, and the steel fibers partially adhere to the mating surfaces, resulting in uneven elongation of each steel plate in the rolling direction. To prevent blisters from occurring during rolling. The shape of the steel fiber is such that a part of the corner of the steel fiber touches the surface of the steel plate during rolling (
It is desirable that the cross-sectional shape be a rectangle or a polygon such as a triangle so that it can be penetrated and partially bonded.

実　　　　施　　　　例 以下に実施例にもとづいて詳細に説明する。Example A detailed explanation will be given below based on examples.

板幅および仮長さがそれぞれ１４０　ｍｕｓで板厚が４
５　ｍｍの鋼板２枚を外側に、同じ板幅および仮長さを
仔し、板厚９０膚嘗の鋼板をその間にはさんだ３枚重ね
の鋼板について、各合せ面の間に第１表に示す各種の形
状および寸法のスチールファイバーを散布量を変えて分
散させ、？す離削を尖布した後、周縁部を一部の空気抜
き孔を残して溶接固着し、　１２００°Ｃで１時間均熱
した後、ロール径８５０■、の２段圧延機で１５バス、
８ｍｍ厚まで圧延した。なお、その際幅出しバスを４バ
ス行ない化上鋼板（以下複合鋼板という）の幅を２８０
　ｍ−とじた。また、剥離剤はアルミナを添加したデキ
ストリン分散液を用い、乾燥後厚さ３００μとなるよう
に彷布した。第１表に複合鋼板のふくれ発生状況を併記
する。The plate width and temporary length are each 140 mus, and the plate thickness is 4.
For a three-ply steel plate with two 5 mm steel plates on the outside, the same plate width and temporary length, and a 90 mm thick steel plate sandwiched between them, the following table 1 is applied between each mating surface. Steel fibers of various shapes and dimensions shown are dispersed at different rates, and ? After grinding, the peripheral edge was welded and fixed leaving some air vent holes, and after soaking at 1200°C for 1 hour, it was rolled in a two-high rolling machine with a roll diameter of 850mm for 15 baths.
It was rolled to a thickness of 8 mm. In addition, at this time, the width of the steel plate (hereinafter referred to as composite steel plate) was increased to 280 mm by performing four width width buses.
m-closed. A dextrin dispersion containing alumina was used as a release agent, and was spread to a thickness of 300 μm after drying. Table 1 also shows the occurrence of blistering in composite steel plates.

また、上記の複合制振鋼板のそれぞれについて５箇所を
スポット溶接により固着し、周縁の溶接部分を除去した
後、垂直に吊下げ、ハンマーで打撃を加えて振動をおこ
させ、ピーク音圧レベルを測定して各複合鋼板の制振効
果を比較した。第３図はピーク音圧レベルの測定法を示
す説明図で、複合鋼板（８）に対し３０度傾斜させて懸
吊した腕長さ２００＠−１重ｆｆ１６２０　ｇのプラス
チック製ハンマー（９）の自重により、該複合鋼板（８
）に打撃を加えた。該測定法により得たピーク音圧レベ
ルの測定結果を第１表に併せ示した。In addition, each of the above composite vibration damping steel plates was fixed by spot welding at 5 points, and after removing the welded parts on the periphery, it was hung vertically and struck with a hammer to cause vibration, and the peak sound pressure level was reduced. The vibration damping effects of each composite steel plate were measured and compared. Figure 3 is an explanatory diagram showing the method of measuring the peak sound pressure level, in which a plastic hammer (9) with an arm length of 200 @ - 1 weight ff 1620 g is suspended at an angle of 30 degrees from a composite steel plate (8). Due to its own weight, the composite steel plate (8
) was hit. The measurement results of the peak sound pressure level obtained by this measurement method are also shown in Table 1.

第１表の結果から、スチールファイバーの断面形状が角
形で、散布密度が４００本／−を越えている本発明例Ｎ
Ａｌ〜Ｎ１１３においては、圧延後ふくれが全く生ぜず
、ピーク音圧レベルも８４〜８６ｄＢで、特にスチール
ファイバーを散布していない比較例１１ｋｋ８に比べ箸
しい制振効果を有することがわかる。散布密度が３５０
本／♂の場合はふくれが生じ（比較例雨４）また散布密
度が３．５００本／♂になると、ふくれ発生はないが、
重ね合せ鋼板同志の接着面積比率が大きすぎるため、制
振効果は減少し、ピーク音圧レベルが高値を示す。From the results in Table 1, it can be seen that the steel fibers have a rectangular cross-sectional shape and the dispersion density exceeds 400 fibers/-.
In Al to N113, no blistering occurred after rolling, and the peak sound pressure level was 84 to 86 dB, which shows that it has a better vibration damping effect than Comparative Example 11kk8, in which steel fibers are not dispersed. Spreading density is 350
Blisters occur when the number of plants per male is high (Comparative Example Rain 4), and when the spreading density is 3.500 plants per male, no blisters occur, but
Since the adhesion area ratio between the laminated steel plates is too large, the damping effect decreases and the peak sound pressure level shows a high value.

断面積が０．１−に満たない場合はスチールファイバー
の散布密度を１．０００本／♂に増してもふくれが発生
ずる（比較例Ｎ１１６およびＮα７）。スチールファイ
バーを散布しない場合は顕著なふくれ発生がみられる。If the cross-sectional area is less than 0.1-, blistering occurs even if the steel fiber distribution density is increased to 1.000 fibers/male (Comparative Examples N116 and Nα7). If steel fiber is not sprayed, significant blistering will occur.

また、本発明側限３に示すように、断面形状が角形のス
チールファイバーを比較的高密度で散布した場合は、圧
延後重ね合せ鋼板相互の間で接着しており、スポット溶
接等により鋼板同志を固着する工程を省略することが可
能である。In addition, as shown in Limit 3 of the present invention, when steel fibers with square cross-sections are dispersed at a relatively high density, they are bonded between stacked steel plates after rolling, and the steel plates are bonded together by spot welding etc. It is possible to omit the step of fixing.

発明の詳細 な説明したように、鋼板の各合せ面の間にスチールファ
イバーを分散させ、かつ別離剤を塗布した後、各重ね合
せ材同志を固着し、加熱処理後厚板圧延機により圧延す
る本発明方法により、広幅のしかも比較的薄い複合制振
鋼板を制作することが可能で、制振性能のみならず型皿
の軽減をも要求される場所に適用し得る鋼板を提供する
ことができる。As described in detail of the invention, after dispersing steel fibers between each mating surface of the steel plates and applying a separating agent, each laminated material is fixed together, and after heat treatment, it is rolled by a plate rolling machine. By the method of the present invention, it is possible to produce a composite vibration-damping steel plate that is wide and relatively thin, and it is possible to provide a steel plate that can be applied to places where not only vibration-damping performance but also reduction of mold plate is required. .

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明による広幅複合制振鋼板の圧延時の状況
の一例を示す説明図、第２図は本発明による広幅複合制
振鋼板のスポット溶接の状態を示す断面構成図、第３図
は鋼板のピーク音圧レベル測定法を示す説明図である。 １・・・・・・被処理材、２ａ　、　２ｂ　、２ｃ・・
・・・・厚　板、３・・・・・・スチールファイバー、
　　　４・・・・・・剥離剤、５ａ、５ｂ・・・・・・
ワークロール、Ｏａ、ｌＥｂ・・・・・・バックアップ
ロール、７・・・・・・スポット溶接、　　　　　　　
８・・・・・・複合鋼板、９・・・・・・プラスチック
ハンマー。 第１図Fig. 1 is an explanatory diagram showing an example of the rolling situation of the wide composite vibration damping steel plate according to the present invention, Fig. 2 is a cross-sectional configuration diagram showing the state of spot welding of the wide composite vibration damping steel plate according to the present invention, and Fig. 3 FIG. 2 is an explanatory diagram showing a method for measuring the peak sound pressure level of a steel plate. 1... Material to be treated, 2a, 2b, 2c...
...Thick plate, 3...Steel fiber,
4...Removal agent, 5a, 5b...
Work roll, Oa, lEb... Backup roll, 7... Spot welding,
8...Composite steel plate, 9...Plastic hammer. Figure 1

Claims (2)

【特許請求の範囲】[Claims] （１）３枚以上の鋼板を重ね合せた複合制振鋼板を製造
するにあたり、鋼板の各合せ面の間にスチールファイバ
ーを略均等に分散するとともに剥離剤を塗布した後、上
記重ね合せ鋼板の周縁部を一部を残して溶接し、加熱処
理を施し、圧延した後、必要に応じて重ね合せた鋼板同
志を複数箇所で溶接固着し、上記周縁溶接部を除去して
複合鋼板とすることを特徴とする広幅複合制振鋼板の製
造方法。(1) When manufacturing a composite damping steel plate made by laminating three or more steel plates, after distributing steel fibers approximately evenly between each mating surface of the steel plates and applying a release agent, the laminated steel plates are After welding, leaving a part of the peripheral edge, subjecting it to heat treatment, and rolling, welding and fixing the stacked steel plates together at multiple locations as necessary, and removing the peripheral welded area to obtain a composite steel plate. A method for manufacturing a wide composite damping steel plate characterized by: （２）断面積が０．１ｍｍ＾２以上２ｍｍ＾２以下、長
さが２ｍｍ以上５０ｍｍ以下の断面形状が多角形のスチ
ールファイバーを、鋼板の各合せ面の間に１ｍ＾２あた
り４００本以上３，０００本以下分散する特許請求の範
囲第１項記載の広幅複合制振鋼板の製造方法。(2) At least 400 steel fibers with a polygonal cross-sectional shape, with a cross-sectional area of 0.1 mm^2 to 2 mm^2 and a length of 2 mm to 50 mm, per 1 m^2, between each mating surface of the steel plate. A method for producing a wide composite damping steel plate according to claim 1, wherein 3,000 or less pieces are dispersed.