JP2785134B2 - Method for producing ferritic stainless steel sheet with excellent formability and corrosion resistance - Google Patents
Method for producing ferritic stainless steel sheet with excellent formability and corrosion resistanceInfo
- Publication number
- JP2785134B2 JP2785134B2 JP13472989A JP13472989A JP2785134B2 JP 2785134 B2 JP2785134 B2 JP 2785134B2 JP 13472989 A JP13472989 A JP 13472989A JP 13472989 A JP13472989 A JP 13472989A JP 2785134 B2 JP2785134 B2 JP 2785134B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion resistance
- stainless steel
- ferritic stainless
- steel sheet
- aging treatment
- 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.)
- Expired - Fee Related
Links
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、成形性及び耐食性に優れたフェライト系ス
テンレス鋼板の製造方法に関する。The present invention relates to a method for producing a ferritic stainless steel sheet having excellent formability and corrosion resistance.
［従来の技術］ 従来、特開昭55−97421号公報に記載の如くの、ロー
ル成形性に優れたカラー鉄板の製造方法が提案されてい
る。この方法は、普通鋼板に対し、カラー塗装及びレベ
ラー加工を施した後、70℃〜100℃の温度範囲で時効処
理を施すことにより、ロール成形時のポケットウエーブ
を防止するものである。[Prior Art] Conventionally, there has been proposed a method for producing a color iron plate excellent in roll formability as described in JP-A-55-97421. This method is to prevent a pocket wave at the time of roll forming by subjecting a normal steel plate to color coating and leveling, followed by aging treatment at a temperature range of 70 ° C to 100 ° C.
尚、上述のポケットウエーブは、第１図に示す如くの
鋼板のロール成形加工時に発生する波打ち不良現象であ
り、オイルキャンとも呼ばれる。Incidentally, the above-described pocket wave is a waving failure phenomenon that occurs during roll forming of a steel sheet as shown in FIG. 1 and is also called an oil can.
［発明が解決しようとする課題］ 然しながら、フェライト系ステンレス鋼板は、上記従
来技術による70℃〜100℃の温度で行なう時効処理を施
しても、ポケットウエーブを十分に防止できない。[Problems to be Solved by the Invention] However, even if the ferritic stainless steel sheet is subjected to the aging treatment at a temperature of 70 ° C to 100 ° C according to the above-described conventional technology, pocket waves cannot be sufficiently prevented.
然るに、フェライト系ステンレス鋼板を屋根材等に用
いる場合には、その成形加工時に底板部や側板部に、そ
の外観を損なうポケットウエーブを発生させないことが
望まれる。However, when a ferritic stainless steel sheet is used for a roof material or the like, it is desired that a pocket wave that impairs the appearance of the bottom plate or the side plate is not generated at the time of forming.
又、フェライト系ステンレス鋼板を屋根材等として用
いる場合には、例えば10年以上の長期間赤錆や海塩粒子
の付着による孔食等の腐食を生じない充分な耐食性を備
えることが必要とされる。In addition, when a ferritic stainless steel sheet is used as a roofing material or the like, it is necessary to have sufficient corrosion resistance that does not cause corrosion such as pitting due to adhesion of red rust or sea salt particles for a long period of, for example, 10 years or more. .
本発明は、ポケットウエーブを損なうことなく成形加
工できる良好な成形性と、充分な耐食性を確保できるフ
ェライト系ステンレス鋼板の製造方法を提供することを
目的とする。An object of the present invention is to provide a method for producing a ferritic stainless steel sheet capable of ensuring good formability that can be formed without damaging a pocket wave and sufficient corrosion resistance.
［課題を解決するための手段］ 請求項１に記載の本発明は、重量比でCr:17〜35％、
Ｃ＋Ｎ＜0.10％の他、Mo:0.10〜4.5％、Cu:0.10〜4.5
％、Nb:0.05〜1.0％、Ti:0.05〜1.0％の１種以上を含
み、残部は鉄及び不可避的不純物からなるフェライト系
ステンレス鋼を圧延し、仕上焼鈍あるいは調質圧延、非
酸化性雰囲気中にて、120℃〜550℃の温度範囲で５秒以
上48時間以下の時効処理を施すようにしたものである。[Means for Solving the Problems] The present invention according to claim 1, wherein Cr: 17 to 35% by weight,
In addition to C + N <0.10%, Mo: 0.10-4.5%, Cu: 0.10-4.5
%, Nb: 0.05-1.0%, Ti: 0.05-1.0%, the remainder being rolled ferritic stainless steel consisting of iron and unavoidable impurities, finish annealing or temper rolling, non-oxidizing atmosphere The aging treatment is performed in a temperature range of 120 ° C. to 550 ° C. for 5 seconds to 48 hours.
請求項２に記載の本発明は、重量比でCr:17〜35％、
Ｃ＋Ｎ＜0.10％の他、Mo:0.10〜4.5％、Cu:0.10〜4.5
％、Nb:0.05〜1.0％、Ti:0.05〜1.0％の１種以上を含
み、残部は鉄及び不可避的不純物からなるフェライト系
ステンレス鋼を圧延し、仕上焼鈍あるいは調質圧延後、
120℃〜550℃の温度範囲で５秒以上48時間以下の時効処
理を施し、次いで酸洗処理を施すようにしたものであ
る。The present invention according to claim 2, Cr: 17-35% by weight,
In addition to C + N <0.10%, Mo: 0.10-4.5%, Cu: 0.10-4.5
%, Nb: 0.05 to 1.0%, Ti: 0.05 to 1.0%, and the rest is rolled ferritic stainless steel consisting of iron and unavoidable impurities, after finish annealing or temper rolling,
The aging treatment is performed for 5 seconds or more and 48 hours or less in a temperature range of 120 ° C. to 550 ° C., and then an acid washing treatment is performed.
［作用］ （１）以下に請求項１と請求項２のそれぞれに記載の本
発明における成分限定理由について説明する。尚、以下
に示す成分の％はすべて重量％である。[Operation] (1) The reasons for limiting the components in the present invention described in claims 1 and 2 will be described below. The percentages of the components shown below are all percentages by weight.
Cr: 耐食性の点で、強固な不動態皮膜を形成するには17％
以上必要であり、35％を超えると鋼が脆くなって鋼板を
製造する上でのコストが高くなるため上限を35％とし
た。Cr: 17% to form a strong passive film in terms of corrosion resistance
The above is necessary, and if it exceeds 35%, the steel becomes brittle and the cost of manufacturing a steel plate increases, so the upper limit is set to 35%.
Ｃ＋N: Ｃ＋Ｎが0.1％を超えると粒界腐食が生じ、かつ加工
性が悪くなるので、0.1％以下に限定した。C + N: When C + N exceeds 0.1%, intergranular corrosion occurs and workability deteriorates, so the content was limited to 0.1% or less.
Cu、Mo、Nb、Ti: これらの成分は単独もしくは複合で耐食性に効果があ
る。Mo、Cuは0.10％未満では効果がなく、4.5％を超え
て添加しても耐食性改善効果は飽和し、かつ加工性が低
下するので、0.10〜4.5％とした。Nb、Tiは0.05％未満
では効果がなく、１％を超えて添加しても効果は飽和す
るので、0.05〜1.0％に限定した。Cu, Mo, Nb, Ti: These components alone or in combination have an effect on corrosion resistance. Mo and Cu have no effect if less than 0.10%, and if added over 4.5%, the effect of improving corrosion resistance is saturated and the workability is reduced. Nb and Ti have no effect when the content is less than 0.05%, and the effect is saturated even when added over 1%. Therefore, the content is limited to 0.05 to 1.0%.
（２）次に、請求項１と請求項２のそれぞれに記載の本
発明における時効条件の限定理由について説明する。(2) Next, the reasons for limiting the aging conditions in the present invention described in claims 1 and 2 will be described.
（２−１）時効温度を120℃以上と限定した理由は、120
℃未満ではポケットウエーブに対する効果が減少するの
で、その下限を120℃とした。又、550℃以下と限定した
理由は、550℃を超えるとその効果が減少する傾向が見
られるので、その上限を550℃とした。(2-1) The reason for limiting the aging temperature to 120 ° C or higher is that
If the temperature is lower than 0 ° C, the effect on the pocket wave decreases, so the lower limit is set to 120 ° C. The reason for limiting the temperature to 550 ° C. or lower is that the effect tends to decrease when the temperature exceeds 550 ° C., so the upper limit was set to 550 ° C.
（２−２）時効処理時間を５秒以上とした理由は、５秒
未満の時間ではその効果が少ないため、その下限を５秒
とした。又、48時間以下とした理由は、48時間を超える
とその効果がほぼ飽和値に達するか若干減少する傾向が
見られ、48時間を超える長時間の時効処理を行なう必要
がないため、その上限を48時間とした。(2-2) The reason for setting the aging treatment time to 5 seconds or longer is that the effect is small when the time is shorter than 5 seconds. Therefore, the lower limit is set to 5 seconds. The reason for setting the time to 48 hours or less is that the effect almost reaches a saturation value or slightly decreases after 48 hours, and it is not necessary to perform the aging treatment for a long time exceeding 48 hours. For 48 hours.
（３）次に、請求項１に記載の本発明において、「非酸
化性雰囲気中で時効処理すること」の理由について説明
する。(3) Next, the reason for "aging treatment in a non-oxidizing atmosphere" in the present invention will be described.
大気中で加熱（時効）処理すると、鉄のリッチな酸化
物が生成付着して耐食性を劣化させるので、水素（H2）
ガス、窒素（N2）ガス、アルゴン（Ar）ガス、あるいは
真空中等の非酸化性雰囲気で加熱すれば、酸化そのもの
が抑制され、耐食性を劣化させない。When heated (aged) in air, iron-rich oxides are formed and adhere to deteriorate the corrosion resistance, so hydrogen (H 2 )
If heating is performed in a non-oxidizing atmosphere such as a gas, nitrogen (N 2 ) gas, argon (Ar) gas, or vacuum, the oxidation itself is suppressed and the corrosion resistance is not deteriorated.
（４）次に、請求項２に記載の本発明において、「時効
処理後に酸洗処理を施すこと」の理由について説明す
る。(4) Next, in the present invention described in claim 2, the reason for "performing the pickling treatment after the aging treatment" will be described.
120℃〜550℃での加熱（時効）処理により生成付着す
る表面酸化物は、下地ステンレス鋼よりも耐食性に劣る
ため、その酸化物を酸洗処理により取り除くことが耐食
性改善に有効である。その酸洗処理としては次の条件
、が好適である。Since surface oxides generated and adhered by heating (aging) at 120 ° C. to 550 ° C. are inferior in corrosion resistance to the underlying stainless steel, removing the oxides by pickling is effective for improving corrosion resistance. The following conditions are suitable for the pickling treatment.
硝酸浸漬 NHO3:5〜60％ 液温:20〜70℃ 浸漬時間:5秒以上 硝酸電解 HNO3:5〜60％ 液温:20〜70℃ 電解：電流密度5A/dm2以上、 電解時間１秒以上 ［実施例］ 実施例１ 表１に示す化学組成を持つフェライト系ステンレス鋼
（No.A〜Ｅは本発明例、No.Fは比較例）を溶製、熱間圧
延、焼鈍し、0.6mm厚に冷間圧延し、800℃〜1100℃で仕
上焼鈍後、調質圧延を行なう通常の製造工程により鋼板
を作製した。Nitric acid immersion NHO 3 : 5 to 60% Liquid temperature: 20 to 70 ° C Immersion time: 5 seconds or more Nitric acid electrolysis HNO 3 : 5 to 60% Liquid temperature: 20 to 70 ° C Electrolysis: Current density 5A / dm 2 or more, electrolysis time 1 second or more [Examples] Example 1 Melting, hot rolling, and annealing ferritic stainless steels having the chemical compositions shown in Table 1 (Nos. A to E are inventive examples and No. F is a comparative example). The steel sheet was cold-rolled to a thickness of 0.6 mm, subjected to finish annealing at 800 ° C. to 1100 ° C., and then subjected to temper rolling to produce a steel sheet by a normal manufacturing process.
その後、これらの材料に対して表２に示すような種々
条件（No.1〜２は本発明例）による時効処理を施し、第
１図に示した如くの一定の形状を有する屋根材をロール
成形加工にて製造した。After that, these materials are subjected to aging treatment under various conditions as shown in Table 2 (Nos. 1 to 2 are examples of the present invention), and a roof material having a fixed shape as shown in FIG. It was manufactured by molding.
この製造の結果について、ロール成形により生じたポ
ケットウエーブ高さと耐食性（孔食電位）を時効処理条
件との関係において調査し、表３の結果を得た。With respect to the results of this production, the height of the pocket wave generated by the roll forming and the corrosion resistance (pitting potential) were investigated in relation to the aging treatment conditions, and the results in Table 3 were obtained.
表３によれば、請求項１に記載の本発明により、時効
処理を非酸化性雰囲気のもとで行えば、ポケットウエー
ブを抑制化とともに耐食性を改善できることが認められ
る。According to Table 3, it is recognized that, according to the present invention, when the aging treatment is performed in a non-oxidizing atmosphere, the pocket wave can be suppressed and the corrosion resistance can be improved.
尚、ポケットウエーブの大きさを定量化する方法とし
ては、ポケットウエーブの最も発生しやすいウエブ中央
において渦電流式変位計を走査することで、ポケットウ
エーブ長手方向断面プロファイルを測定し、得られたデ
ータを基に単位長さ当たりの波高さの総和を算出するこ
とにより、ポケットウエーブの大小を定量的に評価する
ことにした。又、耐食性については、30℃の3.5％NaCl
中での孔食電位（10μA/cm2）により評価することとし
た。As a method for quantifying the size of the pocket wave, an eddy current displacement meter is scanned at the center of the web where the pocket wave is most likely to occur, and the profile of the pocket wave in the longitudinal direction is measured. By calculating the sum of the wave heights per unit length based on the above, the magnitude of the pocket wave was quantitatively evaluated. As for the corrosion resistance, 3.5% NaCl at 30 ℃
The pitting potential (10 μA / cm 2 ) was used for evaluation.
実施例２ 実施例１で製造した時効処理後の鋼板を用い、表４に
示す条件で酸洗処理を実施後、実施例１と同様なロール
成形を行ない、その際生じたポケットウエーブ高さと孔
食電位を測定し、表５の結果を得た。Example 2 The steel sheet after aging treatment manufactured in Example 1 was pickled under the conditions shown in Table 4 and then roll-formed in the same manner as in Example 1. The edible potential was measured, and the results in Table 5 were obtained.
表５によれば、時効処理後、請求項２に記載の本発明
による酸洗処理を施せば、時効処理したままの鋼板に比
べ、耐食性を一段と向上できることが認められる。According to Table 5, it is recognized that if the pickling treatment according to the present invention as described in claim 2 is performed after the aging treatment, the corrosion resistance can be further improved as compared with the steel sheet as it is after the aging treatment.
以上のように、請求項１に記載の本発明によれば、ロ
ール成形時に発生するポケットウエーブを防止するとと
もに耐食性を改善できる。従って、加工品の形状性に優
れると同時に長期間にわたり錆等が発生せず当初の美観
を保つ等の効果がある。As described above, according to the first aspect of the present invention, it is possible to prevent pocket waves generated during roll forming and improve corrosion resistance. Therefore, there is an effect that the shape of the processed product is excellent, and at the same time, rust or the like does not occur for a long period of time and the original appearance is maintained.
又、請求項２に記載の本発明によれば、ロール成形時
に発生するポケットウエーブを防止するとともに耐食性
をより一層向上できる。従って、加工品の形状性に優れ
ると同時に腐食環境の厳しい所でも十分に使用に耐える
等の効果がある。Further, according to the present invention, it is possible to prevent a pocket wave generated at the time of roll forming and to further improve the corrosion resistance. Accordingly, there is an effect that the processed product is excellent in shape and at the same time it can be sufficiently used even in a severe corrosive environment.
［発明の効果］ 以上のように本発明によれば、ポケットウエーブを損
なうことなく成形加工できる良好な成形性と、充分な耐
食性を確保できるフェライト系ステンレス鋼板の製造方
法を提供することができる。[Effects of the Invention] As described above, according to the present invention, it is possible to provide a method for producing a ferritic stainless steel sheet capable of ensuring good formability capable of forming without damaging a pocket wave and sufficient corrosion resistance.
第１図は屋根用成形材を示す模式図である。 FIG. 1 is a schematic view showing a roof molding material.
フロントページの続き (72)発明者 曽根 雄二 千葉県千葉市川崎町１番地 川崎製鉄株 式会社技術研究所内 (56)参考文献 特開 平２−310320（ＪＰ，Ａ) 特開 平２−310318（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C21D 9/46Continuation of the front page (72) Inventor Yuji Sone 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Corp. Technical Research Laboratory (56) References JP-A-2-310320 (JP, A) JP-A-2-310318 ( JP, A) (58) Field surveyed (Int. Cl. 6 , DB name) C21D 9/46
Claims (2)
他、Mo:0.10〜4.5％、Cu:0.10〜4.5％、Nb:0.05〜1.0
％、Ti:0.05〜1.0％の１種以上を含み、残部は鉄及び不
可避的不純物からなるフェライト系ステンレス鋼を圧延
し、仕上焼鈍あるいは調質圧延後、非酸化性雰囲気中に
て、120℃〜550℃の温度範囲で５秒以上48時間以下の時
効処理を施すことを特徴とする成形性及び耐食性に優れ
たフェライト系ステンレス鋼板の製造方法。(1) Cr: 17-35%, C + N <0.10%, Mo: 0.10-4.5%, Cu: 0.10-4.5%, Nb: 0.05-1.0 by weight ratio.
%, One or more of Ti: 0.05-1.0%, the balance being rolled ferritic stainless steel consisting of iron and unavoidable impurities, after finish annealing or temper rolling, in a non-oxidizing atmosphere at 120 ° C. A method for producing a ferritic stainless steel sheet having excellent formability and corrosion resistance, characterized by performing aging treatment for 5 seconds to 48 hours in a temperature range of up to 550 ° C.
他、Mo:0.10〜4.5％、Cu:0.10〜4.5％、Nb:0.05〜1.0
％、Ti:0.05〜1.0％の１種以上を含み、残部は鉄及び不
可避的不純物からなるフェライト系ステンレス鋼を圧延
し、仕上焼鈍あるいは調質圧延後、120℃〜550℃の温度
範囲で５秒以上48時間以下の時効処理を施し、次いで酸
洗処理を施すことを特徴とする成形性及び耐食性に優れ
たフェライト系ステンレス鋼板の製造方法。2. Cr: 17-35%, C + N <0.10%, Mo: 0.10-4.5%, Cu: 0.10-4.5%, Nb: 0.05-1.0 by weight ratio.
%, One or more of Ti: 0.05 to 1.0%, the remainder being rolled ferritic stainless steel composed of iron and unavoidable impurities, and after finish annealing or temper rolling, 5% in a temperature range of 120 ° C to 550 ° C. A method for producing a ferritic stainless steel sheet having excellent formability and corrosion resistance, which comprises subjecting to an aging treatment for at least 48 seconds to an aging treatment, followed by an acid pickling treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13472989A JP2785134B2 (en) | 1989-05-30 | 1989-05-30 | Method for producing ferritic stainless steel sheet with excellent formability and corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13472989A JP2785134B2 (en) | 1989-05-30 | 1989-05-30 | Method for producing ferritic stainless steel sheet with excellent formability and corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH032330A JPH032330A (en) | 1991-01-08 |
| JP2785134B2 true JP2785134B2 (en) | 1998-08-13 |
Family
ID=15135230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13472989A Expired - Fee Related JP2785134B2 (en) | 1989-05-30 | 1989-05-30 | Method for producing ferritic stainless steel sheet with excellent formability and corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2785134B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6526436B2 (en) * | 2015-02-17 | 2019-06-05 | 日鉄日新製鋼株式会社 | Ferritic stainless steel plant components for plant applications with excellent corrosion resistance in environments containing sulfate and chloride ions |
-
1989
- 1989-05-30 JP JP13472989A patent/JP2785134B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH032330A (en) | 1991-01-08 |
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