JP3146939B2 - Steel sheet with excellent blackening properties - Google Patents
Steel sheet with excellent blackening propertiesInfo
- Publication number
- JP3146939B2 JP3146939B2 JP21285395A JP21285395A JP3146939B2 JP 3146939 B2 JP3146939 B2 JP 3146939B2 JP 21285395 A JP21285395 A JP 21285395A JP 21285395 A JP21285395 A JP 21285395A JP 3146939 B2 JP3146939 B2 JP 3146939B2
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- Japan
- Prior art keywords
- steel sheet
- less
- content
- blackening
- adhesion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Heat Treatment Of Sheet Steel (AREA)
- Chemical Treatment Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、カラ−テレビジョン
ブラウン管用の磁気シ−ルド材（マスクフレ−ム材，シ
ャドウマスクインナ−シ−ルド材，アウタ−シ−ルド材
等）として好適な、表面の黒化処理が施される鋼板に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use as a magnetic shield material (a mask frame material, a shadow mask inner shield material, an outer shield material, etc.) for a color television CRT. The present invention relates to a steel sheet whose surface is blackened.
【０００２】[0002]
【従来技術とその課題】カラ−テレビジョンのブラウン
管では、電子ビ−ムが地磁気によって偏向されるのを防
ぐためその内部が磁気シ−ルド材で覆われている。そし
て、一般に、この磁気シ−ルド材には“アルミキルド鋼
板を所望形状にプレス成形した後に酸化雰囲気ガス中で
黒化処理されたもの”が用いられている。2. Description of the Related Art In a cathode ray tube of a color television, the inside of the cathode ray tube is covered with a magnetic shield material to prevent the electron beam from being deflected by geomagnetism. Generally, "a material obtained by press-forming an aluminum-killed steel sheet into a desired shape and then blackening in an oxidizing atmosphere gas" is used as the magnetic shield material.
【０００３】なお、上述の如く鋼板表面に黒化処理を施
す目的は、 a) 錆を防止すること， b) 熱放射率を高くすること， c) 電子の乱反射を防止すること，にある。The purpose of blackening the steel sheet surface as described above is to a) prevent rust, b) increase the thermal emissivity, and c) prevent diffuse reflection of electrons.
【０００４】しかしながら、鋼板表面に生成する黒化膜
は Fe3Ｏ4 を主体とした酸化膜であって、熱放射率の向
上や電子の乱反射防止には非常に有効であるものの、一
方で膜の剥離が生じやすいという問題があった。また、
上記黒化膜を形成させる際の問題として、黒化膜の生成
に伴ってブラウン管材料としての性能に悪影響を及ぼす
赤錆が発生しやすいことも指摘されていた。However, the blackened film formed on the surface of the steel sheet is an oxide film mainly composed of Fe 3 O 4 and is very effective in improving the thermal emissivity and preventing irregular reflection of electrons. There is a problem that peeling is easily caused. Also,
As a problem in forming the blackened film, it has been pointed out that red rust which adversely affects the performance as a cathode ray tube material is likely to be generated as the blackened film is generated.
【０００５】そこで、特開昭６１−１７４３６０号公報
には、鋼板のＣ含有量，Ｎ含有量を低減することで成形
時にストレッチャストレインが生じるのを抑制し、これ
により黒化膜が剥離するのを防止しようとの提案がなさ
れている。また、特開昭６０−６７６４０号公報には、
鋼板のＣ含有量を規制して赤錆発生を助長する Fe3Ｃの
析出を抑制し、これにより赤錆の発生を防止する方法が
提案されている。更に、特開平４−３４１５４１号公報
には、鋼板の結晶粒径を制御することで形成される黒化
膜の密着性改善と透磁率の向上を図る方法が開示されて
いる。Therefore, Japanese Patent Application Laid-Open No. 61-174360 discloses that the C content and the N content of a steel sheet are reduced to suppress the occurrence of stretch strain during forming, and that the blackened film is peeled off. Proposals have been made to prevent this. Also, JP-A-60-67640 discloses that
A method has been proposed in which the C content of a steel sheet is regulated to suppress the precipitation of Fe 3 C, which promotes the generation of red rust, thereby preventing the generation of red rust. Furthermore, Japanese Patent Application Laid-Open No. 4-341541 discloses a method for improving the adhesion and the magnetic permeability of a blackened film formed by controlling the crystal grain size of a steel sheet.
【０００６】しかし、これらの方法を適用した場合で
も、形成される黒化膜の密着性は未だ十分ではなく、ま
た黒化処理条件のバラツキによって生じると思われる赤
錆発生の問題は依然として解決されなかった。However, even when these methods are applied, the adhesion of the blackened film to be formed is not yet sufficient, and the problem of the occurrence of red rust, which is considered to be caused by the variation in the blackening conditions, has not been solved yet. Was.
【０００７】このようなことから、本発明が目的とした
のは、黒化膜の密着性が良好な上に黒化処理時における
赤錆発生の懸念もないという優れた黒化処理性を有し、
例えばカラ−テレビジョン用の磁気シ−ルド材等として
も優れた性能が発揮される鋼板を提供することである。[0007] In view of the above, the object of the present invention is to provide an excellent blackening treatment property in which the adhesion of the blackening film is good and there is no concern about generation of red rust during the blackening treatment. ,
For example, it is an object of the present invention to provide a steel sheet which exhibits excellent performance as a magnetic shield material for a color television.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、上記目的
を達成すべく、まず「黒化処理時に発生する赤錆は黒化
膜表面で生成しやすい」との事実を踏まえて赤錆発生の
メカニズムにつき種々研究を行ったところ、次に示すよ
うな一連の事項を知見するに至った。Means for Solving the Problems In order to achieve the above-mentioned object, the present inventors first developed red rust based on the fact that red rust generated during blackening treatment is easily generated on the surface of the blackened film. After conducting various studies on the mechanism, a series of matters as described below was found.
【０００９】a) 磁気シ−ルド用アルミキルド鋼板の黒
化処理時に生成する赤錆は、“鋼板面と黒化膜との界面
に生じる鋼板中合金元素の濃化”や“鋼板と黒化膜との
密着性劣化”により黒化膜表面へのFeの拡散が抑制ない
しは阻害され、その結果として黒化膜表面に酸素量の多
い Fe2Ｏ3 が生成する現象に起因したものである。特
に、鋼板中に一般的に含有されている微量のCuは酸化さ
れにくいので黒化処理時に黒化膜と鋼板との界面に濃化
しやすく、赤錆発生の大きな原因の１つとなっている。 b) 従って、鋼板中に含まれるCuの含有量を規制するこ
とが赤錆抑制に顕著な効果を発揮する。A) Red rust generated during the blackening treatment of an aluminum-killed steel sheet for magnetic shielding can be attributed to “enrichment of alloy elements in the steel sheet at the interface between the steel sheet surface and the blackened film” and “ This is due to the phenomenon that the diffusion of Fe to the surface of the blackened film is suppressed or hindered by the “deterioration of adhesion”, and as a result, Fe 2 O 3 having a large amount of oxygen is generated on the surface of the blackened film. In particular, since a trace amount of Cu generally contained in a steel sheet is hard to be oxidized, it is easily concentrated at the interface between the blackened film and the steel sheet during the blackening treatment, which is one of the major causes of the generation of red rust. b) Therefore, regulating the content of Cu contained in the steel sheet has a remarkable effect on suppressing red rust.
【００１０】c) また、上述のように赤錆発生に大きく
係わる“黒化膜の密着性”については、黒化処理時に鋼
板中へ吸収される水素が大きく影響しており、吸収され
た水素がその後の冷却過程でガスとなって鋼板と黒化膜
の界面に溜まることが黒化膜の密着性劣化の主因となっ
ている。C) As described above, regarding the "adhesion of the blackened film", which is largely related to the generation of red rust, the hydrogen absorbed into the steel sheet during the blackening treatment has a large effect. A gas that accumulates at the interface between the steel sheet and the blackening film during the subsequent cooling process is a major cause of the deterioration of the adhesion of the blackening film.
【００１１】d) このため、鋼板と黒化膜との密着性を
改善して赤錆の発生を抑えるには鋼板の水素吸蔵能を上
げることが有効と考えられるが、鋼板の水素吸蔵能の上
昇には、鋼板中の介在物、特に酸化物の量を増やすのが
非常に有効である。 e) 更に、鋼板と黒化膜との密着性の改善には“鋼板の
表面粗さを粗くすること”も極めて有効である。D) Therefore, it is considered effective to increase the hydrogen storage capacity of the steel sheet in order to improve the adhesion between the steel sheet and the blackening film and suppress the generation of red rust, but it is effective to increase the hydrogen storage capacity of the steel sheet. It is very effective to increase the amount of inclusions, especially oxides, in the steel sheet. e) Further, "to increase the surface roughness of the steel sheet" is extremely effective for improving the adhesion between the steel sheet and the blackening film.
【００１２】本発明は、上記知見事項等に基づいてなさ
れたものであり、「熱延鋼板，冷延鋼板を問わず、鋼板
をＣ：0.05％以下（以降、 成分割合を表す％は重量割合
とする),Si： 0.5％以下， Mn：0.04〜 1.0％，
Ｐ：0.05％以下，Ｓ：0.02％以下， sol.Al： 0.005
％以下， Ｏ： 0.008〜 0.060％，Cu：0.04％以下，
Ｎ：0.01％以下を含むか、 あるいは更にＢ：0.0005〜
0.0050％， Ti：0.003 〜0.10％， Nb：0.003 〜0.10
％の１種以上をも含有すると共に残部が実質的にFeであ
る化学組成で、 かつ表面の平均粗さ（Ｒａ）が 1.1μｍ
以上に調整されてなる構成とすることにより優れた黒化
処理性を付与した点」に大きな特徴を有している。The present invention has been made on the basis of the above findings and the like. "The steel sheet is C: 0.05% or less irrespective of the hot-rolled steel sheet or the cold-rolled steel sheet. ), Si: 0.5% or less, Mn: 0.04-1.0%,
P: 0.05% or less, S: 0.02% or less, sol.Al: 0.005
%, O: 0.008 to 0.060%, Cu: 0.04% or less,
N: contains 0.01% or less, or B: 0.0005 ~
0.0050%, Ti: 0.003 to 0.10%, Nb: 0.003 to 0.10
%, And the balance is substantially Fe, and the average surface roughness (Ra) is 1.1 μm.
The point that excellent blackening property is imparted by adopting the configuration adjusted as described above. "
【００１３】[0013]
【作用】以下、本発明において、鋼板の化学組成並びに
表面粗さを前記の如くに限定した理由をその作用と共に
説明する。 [A] 化学組成 (a) Ｃ Ｃは、鋼板中にセメンタイトとして存在して黒化処理時
に赤錆発生の原因となったり、時効により降伏伸びを発
生させることで黒化処理後の成形時に黒化膜剥離を助長
したり、更には黒化処理時にガスとなって生成する黒化
膜の密着性を下げたりするので好ましくない元素であ
る。しかし、Ｃ含有量が0.05％にまで低減されれば上記
弊害は顕著化しなくなるので、Ｃ含有量は0.05％以下と
定めたが、好ましくは0.02％以下、更に好ましくは 0.0
05％以下に調整するのが良い。The reason why the chemical composition and the surface roughness of the steel sheet are limited as described above in the present invention will be described together with the function. [A] Chemical composition (a) C C is present as cementite in the steel sheet and causes red rust during the blackening treatment, or yields elongation due to aging, causing blackening during molding after the blackening treatment. It is an element that is not preferable because it promotes film peeling and further lowers the adhesion of a blackened film formed as a gas during the blackening process. However, if the C content is reduced to 0.05%, the above harmful effects will not be remarkable. Therefore, the C content is set to 0.05% or less, preferably 0.02% or less, more preferably 0.02% or less.
It is better to adjust to 05% or less.
【００１４】(b) Si Siは鋼板の強度を上昇させ加工性を低下させる成分であ
るが、 0.5％までの含有量であればその弊害を許容でき
ることから、Si含有量は 0.5％以下と定めた。(B) Si Si is a component that increases the strength of a steel sheet and lowers workability. However, if its content is up to 0.5%, its harmful effects can be tolerated. Therefore, the Si content is determined to be 0.5% or less. Was.
【００１５】(c) Mn Mnは、MnＳを形成して鋼中のＳを固定することで鋼板の
表面疵を防止する作用を有しているが、その含有量が0.
04％未満では該作用による所望の効果が得られず、一
方、 1.0％を超えて含有させてもその効果が飽和するば
かりか、鋼板の強度が上昇して加工性の低下を招く。従
って、Mn含有量は0.04〜 1.0％と定めた。(C) Mn Mn has the effect of forming MnS and fixing S in the steel to prevent surface flaws on the steel sheet, but the content of Mn is 0.1%.
If it is less than 04% without the desired effect is obtained by the action, on the other hand, when the content exceeds 1.0%, not only the effect is saturated, leading to deterioration of workability strength of the steel sheet rises. Therefore, the Mn content is determined to be 0.04 to 1.0%.
【００１６】(d) Ｐ Ｐは、鋼板の強度を上昇させて加工性を低下させるほ
か、黒化処理時に鋼板と黒化膜との界面に濃化してFeの
拡散を阻害し赤錆発生の原因となる好ましくない不可避
的不純物元素であり、許容限が0.05％であることからＰ
含有量を0.05％以下と定めたが、その含有量は少ない方
が良く、好ましくは 0.015％以下、更に好ましくは 0.0
10％以下に調整するのが良い。(D) PP increases the strength of the steel sheet to lower the workability, and also concentrates at the interface between the steel sheet and the blackened film during the blackening treatment, hinders the diffusion of Fe and causes red rust. Is an undesirable unavoidable impurity element, and the allowable limit is 0.05%.
Although the content is determined to be 0.05% or less, it is better that the content is small, preferably 0.015% or less, more preferably 0.05% or less.
Adjust to 10% or less.
【００１７】(e) Ｓ Ｓは、Feと低融点化合物を生成して鋼の熱間加工性を低
下させ、熱延鋼板製造時における疵発生の原因となる好
ましくない不可避的不純物元素であり、許容限が0.02％
であることからＳ含有量を0.02％以下と定めたが、その
含有量はできるだけ少ない方が良い。(E) S S is an undesirable unavoidable impurity element that forms a low-melting compound with Fe to lower the hot workability of steel and causes flaws during the production of a hot-rolled steel sheet. 0.02% tolerance
Therefore, the S content is determined to be 0.02% or less, but the content is preferably as small as possible.
【００１８】(f) sol.Al 本発明に係る鋼板は、黒化膜の密着性を上げるために水
素の吸蔵能を向上させた点を１つの大きな特徴としてい
る。そして、その目的を達成すべく鋼板中に酸化物を介
在物として多量に含有させるよう図っている。しかし、
鋼中に付随されるsol.Alの含有量が 0.005％よりも多く
なると脱酸されることにより酸化物の介在物量が十分で
なくなって所望の水素吸蔵能を確保できなくなることか
ら、sol.Al含有量は 0.005％以下と定めた。(F) sol.Al One of the great features of the steel sheet according to the present invention is that the hydrogen absorbing capacity is improved in order to increase the adhesion of the blackened film. And, in order to achieve the object, the steel sheet is made to contain a large amount of oxides as inclusions. But,
If the content of sol.Al accompanying steel is more than 0.005%, the content of oxide inclusions becomes insufficient due to deoxidation and the desired hydrogen storage capacity cannot be secured. The content was determined to be 0.005% or less.
【００１９】(g) Ｏ 上述のように、本発明に係る鋼板は、酸化物を介在物と
して多量に含有させて水素の吸蔵能を向上させ、黒化膜
の密着性改善を図ったものであるが、そのためには鋼中
に 0.008％以上のＯを含有させる必要がある。しかし、
0.060％を超えてＯを含有させるとヘゲ疵等といった表
面疵の原因となったり、耐火物を溶損させる原因とな
る。従って、Ｏ含有量は 0.008〜 0.060％と定めたが、
好ましくは0.010 〜0.060 ％、更に好ましくは 0.035〜
0.060％、できれば 0.045〜 0.060％に調整するのが良
い。(G) O As described above, the steel sheet according to the present invention contains a large amount of oxides as inclusions to improve the hydrogen storage capacity and improve the adhesion of the blackened film. However, for this purpose, O must be contained in steel in an amount of 0.008% or more. But,
If O is contained in excess of 0.060%, it may cause surface flaws such as barbed flaws and the like, and may cause refractory to melt. Therefore, although the O content was determined to be 0.008 to 0.060%,
Preferably 0.010 to 0.060%, more preferably 0.035 to 0.035%
It is better to adjust to 0.060%, preferably to 0.045 to 0.060%.
【００２０】(h) Cu Cuは、黒化処理時に鋼板と黒化膜との界面に濃化してFe
の拡散を阻害するため赤錆発生の原因となる不純物元素
である。しかし、0.04％にまで低減されれば前記弊害は
顕著化しなくなるので、Cu含有量は0.04％以下と定めた
が、その含有量は少ない方が良く、好ましくは0.02％以
下、より好ましくは0.01％以下に調整するのが良い。(H) Cu Cu is concentrated at the interface between the steel sheet and the blackened film during the blackening treatment, and
Is an impurity element that inhibits the diffusion of rust and causes the generation of red rust. However, if the content is reduced to 0.04%, the adverse effect does not become noticeable. Therefore, the Cu content is determined to be 0.04% or less, but the content is preferably as small as possible, preferably 0.02% or less, more preferably 0.01% or less. It is better to adjust as follows.
【００２１】(i) Ｎ Ｎは、時効により鋼板に降伏伸びを発生させるように作
用して黒化処理後の成形時に黒化膜剥離を助長したり、
更には時効により鋼板の成形性を低下させたりするので
好ましくない不可避的不純物元素である。しかし、Ｎ含
有量を0.01％以下にまで低減すれば前記弊害は許容範囲
に収まることから、Ｎ含有量は0.01％以下と定めた。(I) NN N acts to generate a yield elongation in the steel sheet by aging, and promotes peeling of a blackened film at the time of forming after a blackening treatment.
Furthermore, it is an undesirable unavoidable impurity element because it reduces the formability of the steel sheet due to aging. However, if the N content is reduced to 0.01% or less, the above harmful effects fall within an allowable range. Therefore, the N content is set to 0.01% or less.
【００２２】(j) Ｂ，Ti及びNb Ｂ，TiあるいはNbには何れもＮを窒化物として固定して
時効劣化を防止する働きがあり、またTi及びNbはＣを炭
化物として固定することでＣの悪影響を軽減する効果を
発揮する。従って、本願発明では必要に応じてＢ，Tiあ
るいはNbの１種又は２種以上の添加を行うが、その含有
量がＢの場合には0.0005％を、Tiの場合には 0.003％
を、そしてNbの場合には 0.003％をそれぞれ下回ると前
記効果が十分に得られず、一方、Ｂが0.0050％を、Tiが
0.10％を、そしてNbが0.10％をそれぞれ超えて含有され
ると強度が上昇し加工性が低下すること、また前記効果
も飽和することから、Ｂ，Ti及びNbの含有量はそれぞれ
Ｂ：0.0005〜0.0050％，Ti：0.003 〜0.10％，Nb：0.00
3 〜0.10％と定めた。(J) B, Ti and Nb Each of B, Ti and Nb has a function of fixing N as a nitride to prevent aging deterioration, and Ti and Nb are formed by fixing C as a carbide. It has the effect of reducing the adverse effects of C. Therefore, in the present invention, one, two or more of B, Ti or Nb is added as required. When the content is B, 0.0005% is added, and when the content is Ti, 0.003% is added.
And in the case of Nb below 0.003%, the above effect is not sufficiently obtained, while B is 0.0050% and Ti is
When the content of 0.10% and Nb exceeds 0.10%, respectively, the strength is increased and the workability is reduced, and the effect is saturated. Therefore, the contents of B, Ti and Nb are respectively B: 0.0005. Up to 0.0050%, Ti: 0.003 to 0.10%, Nb: 0.00
It was determined to be 3 to 0.10%.
【００２３】[B] 表面粗さ 本発明に係る鋼板は熱延鋼板又は冷延鋼板の何れでも良
いが、その平均表面粗さ（Ｒａ）を 0.1μｍ以上に調整
する必要がある。その理由は、表面の凹凸によるアンカ
−効果で黒化膜と鋼板の密着性を上げ、黒化膜の剥離を
防止することにある。ただ、鋼板の表面粗度が平均表面
粗さ（Ｒａ）で 1.1μｍ未満であると所望する密着性を
確保することができないので、Ｒａ 1.1μｍ以上の粗さ
と定めたが、好ましくは 1.3μｍ以上、より好ましくは
1.8μｍ以上、できれば 2.0μｍ以上に調整するのが良
い。[B] Surface Roughness The steel sheet according to the present invention may be either a hot-rolled steel sheet or a cold-rolled steel sheet, but its average surface roughness (Ra) needs to be adjusted to 0.1 μm or more. The reason is that the adhesion between the blackened film and the steel plate is increased by the anchor effect due to the unevenness of the surface, and the blackened film is prevented from peeling. However, if the surface roughness of the steel sheet is less than 1.1 μm in average surface roughness (Ra), the desired adhesion cannot be secured. Therefore, the roughness is determined to be Ra 1.1 μm or more, preferably 1.3 μm or more. , More preferably
It is preferable to adjust the thickness to 1.8 μm or more, preferably to 2.0 μm or more.
【００２４】なお、鋼板への上記表面粗さの付与は、ス
キンパスにおいて“ロ−ルの表面粗さ”や“伸び率”を
変える手立てや、鋼板表面にショットピ−ニングを加え
る等の手立てで実現することができる。The above-mentioned surface roughness can be imparted to the steel sheet by means such as changing the "roll surface roughness" or "elongation" in the skin pass, or by adding shot peening to the steel sheet surface. can do.
【００２５】[0025]
【実施例】まず、転炉で溶製した種々の未脱酸のスラブ
からラボ熱延用の４５mm厚スラブを切り出し、１２００
℃に加熱後、 4.5mm厚まで熱間圧延を実施した。そし
て、スケ−ル除去のためにこれら各熱延鋼板を 4.0mm厚
にまで両面研削し、それから0.8mm まで冷間圧延を施し
た。続いて、得られた各冷延鋼板につき、７００℃で６
時間の箱焼鈍を実施した。なお、箱焼鈍時に、一部の鋼
種では露点を変えて脱炭を行った。この焼鈍後における
各冷延鋼板の化学組成を表１に示す。EXAMPLE First, a 45 mm thick slab for hot rolling in a laboratory was cut out from various undeoxidized slabs melted in a converter.
After heating to ° C., hot rolling was performed to a thickness of 4.5 mm. Each of these hot-rolled steel sheets was ground to a thickness of 4.0 mm to remove the scale, and then cold-rolled to 0.8 mm. Subsequently, each of the obtained cold-rolled steel sheets was heated at 700 ° C. for 6 hours.
Time box annealing was performed. At the time of box annealing, decarburization was performed for some steel grades by changing the dew point. Table 1 shows the chemical composition of each cold-rolled steel sheet after this annealing.
【００２６】[0026]
【表１】 [Table 1]
【００２７】次に、上記各冷延鋼板に調質圧延を施して
表面粗さの調整を行った。ここで、鋼板の表面粗さは
“調質圧延で使用したロ−ルの表面粗さ”と“調質圧延
での伸び率”を変化させることで調整した。このように
して調整された各冷延鋼板表面の平均粗さ（Ｒａ）を表
２に示す。Next, the respective cold-rolled steel sheets were subjected to temper rolling to adjust the surface roughness. Here, the surface roughness of the steel sheet was adjusted by changing "the surface roughness of the roll used in the temper rolling" and "the elongation in the temper rolling". Table 2 shows the average roughness (Ra) of each cold-rolled steel sheet surface thus adjusted.
【００２８】[0028]
【表２】 [Table 2]
【００２９】次いで、表面粗度調整された上記各冷延鋼
板につき、５８０℃で１５分間均熱してから空冷を施す
黒化処理を実施した。なお、黒化処理の均熱時において
は、空気に水蒸気を含ませ、これを１リットル／分の流量で
流すことにより酸化雰囲気とした。Next, each of the cold-rolled steel sheets whose surface roughness was adjusted was subjected to a blackening treatment of soaking at 580 ° C. for 15 minutes, followed by air cooling. In addition, at the time of soaking in the blackening treatment, the air was made to contain water vapor, and this was flown at a flow rate of 1 liter / min to form an oxidizing atmosphere.
【００３０】そして、黒化処理後の各鋼板について、黒
化処理性を評価するため「赤錆発生傾向」と「黒化膜の
密着性」を調査した。ここで、「赤錆発生傾向」は、薄
膜Ｘ線解析にて“ Fe2Ｏ3 の（０１２）面強度”と“ F
e3Ｏ4 の（２２０）面強度”とを調べ、その比率により
評価した。即ち、 Fe2Ｏ3 の割合が Fe3Ｏ4 のそれより
も高くなるほど赤錆発生率が高くなって黒化処理性に劣
るからである。また、「黒化膜の密着性」は 0.5ｔの曲
げ試験にて判定した。その結果を表２に併せて示す。Then, for each steel sheet after the blackening treatment, "the tendency to generate red rust" and "the adhesion of the blackening film" were examined to evaluate the blackening treatment property. Here, the “red rust generation tendency” indicates “(012) plane strength of Fe 2 O 3 ” and “F
The (220) plane strength of e 3 O 4 was examined and evaluated based on the ratio. That is, as the ratio of Fe 2 O 3 became higher than that of Fe 3 O 4 , the rate of occurrence of red rust increased and the blackening treatment was performed. The “adhesion of the blackened film” was determined by a 0.5 t bending test. The results are also shown in Table 2.
【００３１】なお、表２において、「黒化膜の密着性」
は ○ … 剥離なし， △ … ２０％未満の剥離あり， × … ２０％以上の剥離あり，で表示した。In Table 2, "Adhesion of blackened film"
Is indicated by ○: no peeling, Δ: peeling of less than 20%, ×: peeling of 20% or more.
【００３２】表２に示される結果から次のことを確認で
きる。即ち、本発明に係る規定条件を満たした鋼板は何
れも“ Fe2Ｏ3 の（０１２）面強度”と“ Fe3Ｏ4 の
（２２０）面強度”の比が 0.3以下という低い値となっ
ている（このため黒化処理後の目視観察によっても赤錆
の発生が認められなかった）。また、曲げ試験で判定さ
れる「黒化膜の密着性」も良好である。The following can be confirmed from the results shown in Table 2. That is, the ratio of “(212) plane strength of Fe 2 O 3 ” to “(220) plane strength of Fe 3 O 4 ” of each of the steel sheets satisfying the specified conditions according to the present invention is as low as 0.3 or less. (Therefore, generation of red rust was not recognized by visual observation after the blackening treatment). Further, the “adhesion of the blackened film” determined by the bending test is also good.
【００３３】そして、Ｂ，Ti又はNbを添加した試験番号
４，７，８及び12に係る本発明鋼板は、１００℃で６０
分の加速時効を施した場合、他の試験材では伸びの低下
が４％程度であったのに対して伸びの低下は２％程度に
抑えられ、時効性の改善が見られた。The steel sheets of the present invention according to Test Nos. 4, 7, 8 and 12 to which B, Ti or Nb was added had a temperature of 60 ° C. at 100 ° C.
When the accelerated aging was performed for a minute, the decrease in elongation was suppressed to about 2%, while the decrease in elongation was about 4% in the other test materials, and the aging property was improved.
【００３４】これに対して、表面粗度の低い試験番号19
及び20に係る比較鋼板では黒化膜の密着性に劣ってお
り、そのため“ Fe2Ｏ3 の（０１２）面強度”と“ Fe3
Ｏ4 の（２２０）面強度”の比も多少高くなっている
（従って黒化処理後の目視観察によって赤錆が黒化膜表
面に薄く成長しているのが認められた）。On the other hand, Test No. 19 having a low surface roughness
And in the comparative steel sheet according to 20 is inferior in adhesion Kurokamaku, and therefore "Fe 2 O 3 in (012) plane intensity""Fe 3
The ratio of the “(220) plane strength of O 4 ” is also slightly higher (therefore, red rust was found to grow thinly on the surface of the blackened film by visual observation after the blackening treatment).
【００３５】また、酸素量の低い試験番号21及び22に係
る比較鋼板では黒化膜の密着性が更に劣っており、曲げ
試験によって黒化膜の大部分が剥離している。そして、
このように黒化膜の密着性が悪いため“ Fe2Ｏ3 の（０
１２）面強度”と“ Fe3Ｏ4の（２２０）面強度”の比
も非常に高くなっている（このため黒化処理後の目視観
察によって過度の赤錆発生が認められた）。Further, in the comparative steel sheets of Test Nos. 21 and 22 having a low oxygen content, the adhesion of the blackened film was further inferior, and most of the blackened film was peeled off by the bending test. And
Thus because of poor adhesion of the blackening film "of Fe 2 O 3 (0
12) The ratio of “plane strength” to “(220) plane strength of Fe 3 O 4 ” is also extremely high (for this reason, excessive red rust was observed by visual observation after blackening treatment).
【００３６】一方、Cu含有量の多い試験番号23に係る比
較鋼板では、密着性は良好であったものの、鋼板と黒化
膜の界面にCuの濃化が生じたためと見られるが“ Fe2Ｏ
3 の（０１２）面強度”と“ Fe3Ｏ4 の（２２０）面強
度”の比は非常に高くなっている（従って黒化処理後の
目視観察によってかなりの赤錆発生が認められた）。On the other hand, in the comparative steel sheet according to many test No. 23 of Cu content, although adhesion was good, apparently because the enrichment of Cu in the interface between the steel plate and the blackened film occurs but "Fe 2 O
The ratio of "(012) plane strength of No. 3 " to "(220) plane strength of Fe 3 O 4 " is very high (accordingly, considerable red rust was observed by visual observation after blackening treatment).
【００３７】[0037]
【効果の総括】以上に説明した如く、この発明によれ
ば、優れた黒化処理性を有し、カラ−テレビジョンのマ
スクフレ−ム用やシャドウマスクインナ−シ−ルド用等
の磁気シ−ルド材として好適な鋼板を提供することが可
能となるなど、産業上有用な効果がもたらされる。As described above, according to the present invention, the present invention has an excellent blackening property and can be used for a magnetic frame for a color television mask frame or a shadow mask inner shield. Industrially useful effects are provided, such as providing a steel sheet suitable as a metal material.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 - 38/60 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) C22C 38/00-38/60
Claims (2)
0.5％以下， Mn：0.04〜 1.0％，Ｐ：0.05％以下，
Ｓ：0.02％以下， sol.Al： 0.005％以下，Ｏ：
0.008〜 0.060％， Cu：0.04％以下， Ｎ：0.01
％以下を含有すると共に残部が実質的にFeである化学組
成で、かつ表面の平均粗さ(Ra)が 1.1μｍ以上に調整さ
れてなることを特徴とする、黒化処理性に優れた鋼板。(1) C: 0.05% or less by weight, Si:
0.5% or less, Mn: 0.04 to 1.0%, P: 0.05% or less,
S: 0.02% or less, sol.Al: 0.005% or less, O:
0.008 to 0.060%, Cu: 0.04% or less, N: 0.01
%, And the balance is substantially Fe, and the average surface roughness (Ra) is adjusted to 1.1 μm or more. .
0.5％以下， Mn：0.04〜 1.0％，Ｐ：0.05％以下，
Ｓ：0.02％以下， sol.Al： 0.005％以下，Ｏ：
0.008〜 0.060％， Cu：0.04％以下， Ｎ：0.01
％以下を含み、更にＢ：0.0005〜0.0050％， Ti：0.00
3 〜0.10％， Nb：0.003 〜0.10％の１種以上をも含有
すると共に残部が実質的にFeである化学組成で、かつ表
面の平均粗さ(Ra)が 1.1μｍ以上に調整されてなること
を特徴とする、黒化処理性に優れた鋼板。2. C: 0.05% or less by weight, Si:
0.5% or less, Mn: 0.04 to 1.0%, P: 0.05% or less,
S: 0.02% or less, sol.Al: 0.005% or less, O:
0.008 to 0.060%, Cu: 0.04% or less, N: 0.01
%, B: 0.0005 to 0.0050%, Ti: 0.00
Chemical composition containing at least one of 3 to 0.10%, Nb: 0.003 to 0.10%, and the balance being substantially Fe, and having an average surface roughness (Ra) adjusted to 1.1 μm or more. A steel sheet having excellent blackening properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21285395A JP3146939B2 (en) | 1995-07-28 | 1995-07-28 | Steel sheet with excellent blackening properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21285395A JP3146939B2 (en) | 1995-07-28 | 1995-07-28 | Steel sheet with excellent blackening properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0941086A JPH0941086A (en) | 1997-02-10 |
| JP3146939B2 true JP3146939B2 (en) | 2001-03-19 |
Family
ID=16629406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21285395A Expired - Fee Related JP3146939B2 (en) | 1995-07-28 | 1995-07-28 | Steel sheet with excellent blackening properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3146939B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6420098A (en) * | 1998-03-19 | 1999-10-11 | Toyo Kohan Co. Ltd. | Steel sheet for shadow mask, shadow mask, and picture tube |
-
1995
- 1995-07-28 JP JP21285395A patent/JP3146939B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0941086A (en) | 1997-02-10 |
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