JP2997592B2 - Manufacturing method of exterior stainless steel sheet having both anti-glare property and corrosion resistance - Google Patents
Manufacturing method of exterior stainless steel sheet having both anti-glare property and corrosion resistanceInfo
- Publication number
- JP2997592B2 JP2997592B2 JP3330543A JP33054391A JP2997592B2 JP 2997592 B2 JP2997592 B2 JP 2997592B2 JP 3330543 A JP3330543 A JP 3330543A JP 33054391 A JP33054391 A JP 33054391A JP 2997592 B2 JP2997592 B2 JP 2997592B2
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- Prior art keywords
- corrosion resistance
- steel sheet
- stainless steel
- acid
- properties
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Description
【0001】[0001]
【産業上の利用分野】本発明は屋根などの外装材に用い
られる防眩性と耐食性を兼ね備えたステンレス鋼板に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel sheet having anti-glare properties and corrosion resistance used for exterior materials such as roofs.
【0002】[0002]
【従来の技術】ステンレス鋼板を屋根などの外装材に用
いる場合、耐食性に加えて、防眩性及びステンレス鋼特
有の色調が要求される。防眩性は鋼板表面に大きな凹凸
をつけて光の反射率を低減することが有効である。鋼板
表面の凹凸は表面に凹凸の加工を行ったダルロールを用
いた圧延により、ロール表面を鋼板へ転写させることに
よりつけられる。2. Description of the Related Art When a stainless steel plate is used for an exterior material such as a roof, in addition to corrosion resistance, antiglare properties and a color tone unique to stainless steel are required. It is effective for the anti-glare property to make large irregularities on the steel sheet surface to reduce the light reflectance. Irregularities on the surface of the steel sheet are formed by transferring the roll surface to the steel sheet by rolling using a dull roll whose surface has been processed.
【0003】防眩性を付与したステンレス鋼としては特
開昭61−227193号や特開平1−162779号
に示されているダル仕上げステンレス鋼があるが、これ
らはいずれも化学発色処理を行う着色ステンレス鋼板で
あり、無彩色から白色のステンレス鋼に関する本発明と
は根本的に異なる。As a stainless steel having an antiglare property, there is a dull-finished stainless steel disclosed in JP-A-61-227193 and JP-A-1-162779, all of which are colored by chemical coloring. It is a stainless steel plate, which is fundamentally different from the present invention relating to achromatic to white stainless steel.
【0004】ステンレス鋼板が屋根用に使われた例とし
ては、パリのショッピングセンターの屋根に特殊なダル
−サテン仕上げのオーステナイトステンレス鋼板が使用
された例がNickel, Volume 6, Number 3, 1991, P.8 に
記載されている。[0004] As an example of the use of stainless steel plates for roofs, a special dull-satin-finished austenitic stainless steel plate was used for the roof of a shopping center in Paris. Nickel, Volume 6, Number 3, 1991, P .8.
【0005】ステンレス鋼板の表面の色調(白色度)は
焼鈍工程を焼鈍・酸洗(AP)工程にするのか、光輝焼
鈍(BA)工程にするのがで決まることが知られてい
る。AP工程では白く仕上がり、白色度は高くなる傾向
がある。一方、BA工程では、AP工程のように、酸洗
(P)工程がないためAP工程に比べて、白色度が低く
なり、金属特有の色調をもつ。このBA鋼板は屋根用等
の外装材に仕上げられるが、耐食性がAP工程材に比べ
て劣るという欠点がある。It is known that the color tone (whiteness) of the surface of a stainless steel plate is determined by whether the annealing step is an annealing / pickling (AP) step or a bright annealing (BA) step. In the AP process, the finish is white, and the whiteness tends to increase. On the other hand, in the BA process, unlike the AP process, since there is no pickling (P) process, the whiteness is lower than that in the AP process, and the metal process has a color tone unique to metal. Although this BA steel sheet is finished as an exterior material for roofs and the like, it has a drawback that its corrosion resistance is inferior to that of the AP process material.
【0006】[0006]
【発明が解決しようとする課題】ダル圧延後、BA工程
を経た鋼板は白っぽさが低減しているため、金属光沢を
保ちながら、防眩性にも優れるという特徴を持つ。しか
し、この工程を経た鋼板の耐食性はダル圧延後AP工程
を経た鋼板に比較して劣るという問題がある。本発明
は、前記問題点を解決した、防眩性と耐食性を兼ね備え
た低白色度の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。The steel sheet which has undergone the BA process after dull rolling has a reduced whiteness, and thus has the characteristic of having excellent antiglare properties while maintaining metallic luster. However, there is a problem that the corrosion resistance of the steel sheet that has passed through this step is inferior to that of the steel sheet that has passed through the AP step after dull rolling. An object of the present invention is to provide a method for producing a low-whiteness stainless steel sheet having both anti-glare properties and corrosion resistance, which solves the above problems.
【0007】[0007]
【発明を解決するための手段】発明者らは、防眩性、耐
食性および白色度に及ぼすダル圧延材の製造プロセスの
影響を調査した結果、次の知見を得た。防眩性は適正粗
度のダル加工で付与できるものの、ダル加工のままでは
耐食性は低下すること、ダル圧延後通常の焼鈍(燃焼ガ
ス雰囲気)をしてアルカリ溶融塩中に浸漬して、そのの
ち(硝酸+弗酸)の混酸で酸洗した鋼板は耐食性は確保
されるが、白色度が高すぎることや焼鈍時の酸化スケー
ルの生成とアルカリ溶融塩中の化学反応が不均一にな
り、色調にむらができることなど、防眩性、耐食性に優
れた低白色度のステンレス鋼板を得ることは極めて難し
い。The inventors of the present invention have investigated the effects of the production process of dull rolled materials on antiglare properties, corrosion resistance and whiteness, and have obtained the following findings. Although the anti-glare property can be imparted by dulling with an appropriate roughness, the corrosion resistance is reduced if dulling is performed. After dull rolling, normal annealing (combustion gas atmosphere) is performed and immersed in alkali molten salt. The steel sheet pickled with a mixed acid of (nitric acid + hydrofluoric acid) is still corrosion-resistant, but its whiteness is too high, oxide scale is generated during annealing, and the chemical reaction in the molten alkali salt is not uniform. It is extremely difficult to obtain a low-whiteness stainless steel sheet having excellent anti-glare properties and corrosion resistance, such as uneven color tone.
【0008】防眩性は結晶粒単位の表面粗さでは付与す
ることができず、表面粗度Raが0.5〜10μmであ
ることが必要であり、また長期の大気暴露下における耐
食性及び色調にも影響することがわかった。そのために
は、焼鈍前に、ダルロールで1パス以上の圧延を行なっ
て適正な表面粗度に調整することが必要である。The antiglare property cannot be imparted by the surface roughness of a crystal grain unit, the surface roughness Ra needs to be 0.5 to 10 μm, and the corrosion resistance and color tone under long-term exposure to the atmosphere. Was also found to affect. For this purpose, it is necessary to perform one or more passes of rolling with a dull roll before annealing to adjust the surface roughness to an appropriate value.
【0009】さらに、ダル加工と耐食性の関係を明確に
するために、ダル圧延後の鋼板表面を詳細に調査した結
果、ダル加工のままでは鋼板表面に加工時に形成された
倒れ込みやダルロール表面の凸部と接し、面圧の高い状
態で圧延された強加工部分が存在し、これら表面の加工
組織が耐食性に影響していることがわかった。Further, in order to clarify the relationship between the dulling and the corrosion resistance, a detailed investigation was made on the steel sheet surface after the dull rolling. As a result, the dulling formed on the steel sheet surface and the convexity of the dull roll surface occurred when the dulling was continued. It was found that there were strongly worked portions that were in contact with the parts and were rolled under a high surface pressure, and that the working structures on these surfaces affected the corrosion resistance.
【0010】本発明のように光輝焼鈍したものはダル圧
延状態が維持されており、そのためステンレス鋼特有の
色調となっている。前記光輝焼鈍鋼板にさらに特定温度
範囲で加熱し酸化スケールを形成させた後、本発明に従
う液中での電解、酸洗を行うことにより、防眩性、白色
度、耐食性のいずれもが満たされることを見出した。[0010] As in the present invention, the bright annealed one is maintained in a dull rolling state, and therefore has a color tone unique to stainless steel. After the bright annealed steel sheet is further heated in a specific temperature range to form an oxide scale, electrolysis in a solution according to the present invention, and acid pickling are performed, thereby satisfying both antiglare properties, whiteness, and corrosion resistance. I found that.
【0011】すなわち、本発明は、重量%で、C:0.
020%以下、Cr:17.0〜35.0%、Mo:
0.5〜4.0%、Cr+3Mo:26〜40%、S
i:0.05〜1.0%、Mn:0.05〜0.5%、
Al:0.005〜0.2%、残部Feおよびその他不
可避的不純物からなり、鋼板の表面粗さ(Ra)が0.
5〜10.0μmの冷延鋼板を光輝焼鈍したあと、40
0〜900℃に再加熱し、中性塩溶液中で1〜20A/dm
2 の条件で電解を行ない、その後硝酸と弗酸の混酸また
は硝酸に浸漬することを特徴とする防眩性と耐食性を兼
ね備えた外装用ステンレス鋼板の製造方法を提供するも
のである。That is, in the present invention, C: 0.
020% or less, Cr: 17.0 to 35.0%, Mo:
0.5 to 4.0%, Cr + 3Mo: 26 to 40%, S
i: 0.05 to 1.0%, Mn: 0.05 to 0.5%,
Al: 0.005 to 0.2%, the balance being Fe and other unavoidable impurities, and the surface roughness (Ra) of the steel sheet is 0.1%.
After bright annealing a cold-rolled steel sheet of 5 to 10.0 μm,
Reheat to 0-900 ° C and 1-20A / dm in neutral salt solution
An object of the present invention is to provide a method for producing an exterior stainless steel sheet having both anti-glare properties and corrosion resistance, characterized by performing electrolysis under the conditions of 2 , followed by immersion in a mixed acid of nitric acid and hydrofluoric acid or nitric acid.
【0012】さらに、Nb:0.1〜0.5%、Ti:
0.1〜0.5%、V:0.05〜0.5%の一種以上
の元素を含有するステンレス鋼板を用いると、耐食性、
防眩性および色調に優れた屋根等の外装用ステンレス鋼
板を製造するのに有利である。Further, Nb: 0.1-0.5%, Ti:
When a stainless steel sheet containing one or more elements of 0.1 to 0.5% and V: 0.05 to 0.5% is used, corrosion resistance,
This is advantageous for producing a stainless steel sheet for exterior use such as a roof having excellent anti-glare properties and color tone.
【0013】[0013]
【作用】以下に本発明をさらに詳細に説明する。まず、
本発明で用いるステンレス鋼の成分および表面性状の限
定理由について述べる。The present invention will be described below in more detail. First,
The reasons for limiting the components and surface properties of the stainless steel used in the present invention will be described.
【0014】C:0.02%より多いと製造中の熱処理
でCr炭化物を形成し、そのため、耐食性が低下する。
したがって、C量は0.02%以下に限定した。C: If it is more than 0.02%, Cr carbides are formed by heat treatment during production, so that the corrosion resistance is reduced.
Therefore, the amount of C was limited to 0.02% or less.
【0015】Cr:耐食性を付与するための必須成分で
あるが、17%より少ないと、長期の大気中の曝露で発
銹する。一方、35%を超えると、延性及び靱性が著し
く低下して、薄板への製造性を著しく阻害する。したが
って、Crの含有量を17〜35%に限定した。Cr: An essential component for imparting corrosion resistance, but if less than 17%, it rusts due to long-term exposure to the atmosphere. On the other hand, if it exceeds 35%, ductility and toughness are significantly reduced, and the productivity of a thin plate is significantly impaired. Therefore, the content of Cr is limited to 17 to 35%.
【0016】Mo:耐孔食性向上に効果があるが、0.
5%より少ないと大気中暴露における孔食発生傾向が高
くなり。一方、4.0%を超えると熱間加工性が著しく
低下する。したがって、Moの含有量を0.5〜4.0
%に限定した。Mo: effective for improving pitting corrosion resistance,
If it is less than 5%, the tendency of pitting corrosion to occur in air exposure increases. On the other hand, when the content exceeds 4.0%, the hot workability is significantly reduced. Therefore, the content of Mo is set to 0.5 to 4.0.
%.
【0017】CrとMoの含有量は、重量%で(Cr+
3Mo)で表される指標が26〜40であることが好ま
しい。The contents of Cr and Mo are expressed in terms of% by weight (Cr +
The index represented by 3Mo) is preferably 26 to 40.
【0018】Crの耐食性向上効果を確保するために、
NbとTiの添加が有効であり、本発明においてはNb
とMoの添加量を以下のように限定した。In order to ensure the effect of improving the corrosion resistance of Cr,
The addition of Nb and Ti is effective.
And the amount of Mo added was limited as follows.
【0019】Nb:Cと結合して炭化物を作り、粒界へ
のCr炭化物の析出を抑制し、耐食性向上に有効な元素
である。0.1%より少ないとCr炭化物の生成を抑制
する効果が小さく、0.5%より大きいと靱性を低下さ
せる。したがって、Nbの含有量は0.1〜0.5%に
限定した。Nb: It is an element that combines with C to form carbides, suppresses the precipitation of Cr carbides at grain boundaries, and is effective in improving corrosion resistance. If it is less than 0.1%, the effect of suppressing the formation of Cr carbide is small, and if it is more than 0.5%, the toughness is reduced. Therefore, the content of Nb is limited to 0.1 to 0.5%.
【0020】Ti:Cと結合して炭化物を作り、粒界へ
のCr炭化物の析出を抑制し、耐食性向上に有効な元素
である。0.1%より少ないとCr炭化物の生成を抑制
する効果が小さく、0.5%より多いと靱性を低下させ
る。したがって、Tiの含有量は0.1〜0.5%に限
定した。[0020] Ti: It is an element that combines with C to form carbides, suppresses precipitation of Cr carbides at grain boundaries, and is effective in improving corrosion resistance. If it is less than 0.1%, the effect of suppressing the formation of Cr carbide is small, and if it is more than 0.5%, the toughness is reduced. Therefore, the content of Ti is limited to 0.1 to 0.5%.
【0021】V:Cと結合して炭化物を作り、粒界への
Cr炭化物の析出を抑制し、耐食性向上に有効な元素で
ある。0.1%より少ないとCr炭化物の生成を抑制す
る効果が小さく、0.5%より多いと靱性を低下させ
る。したがって、Vの含有量は0.1〜0.5%に限定
した。V: It is an element that combines with C to form carbides, suppresses precipitation of Cr carbides at grain boundaries, and is effective in improving corrosion resistance. If it is less than 0.1%, the effect of suppressing the formation of Cr carbide is small, and if it is more than 0.5%, the toughness is reduced. Therefore, the content of V is limited to 0.1 to 0.5%.
【0022】Si:脱酸剤として添加するが、0.05
%未満では効果が小さく、1.0%を超えると機械的性
質に悪影響を及ぼす。したがって、Siの添加量は0.
05〜1.0%に限定した。Si: added as a deoxidizer, 0.05
%, The effect is small, and if it exceeds 1.0%, the mechanical properties are adversely affected. Therefore, the additive amount of Si is 0.1.
It was limited to 05 to 1.0%.
【0023】Mn:0.5%を超えると耐食性が低下す
る。一方、0.05%未満とすると経済性が損なわれ
る。そこで、Mnの添加量を0.05〜0.5%に限定
した。Mn: If it exceeds 0.5%, the corrosion resistance decreases. On the other hand, if it is less than 0.05%, economic efficiency is impaired. Therefore, the addition amount of Mn is limited to 0.05 to 0.5%.
【0024】Al:脱酸剤として添加するが、0.00
5%未満では効果が小さく、0.2%を超えると機械的
性質に悪影響を及ぼす。したがって、Alの添加量を
0.005〜0.2%に限定した。Al: added as a deoxidizer, but 0.00
If it is less than 5%, the effect is small, and if it exceeds 0.2%, the mechanical properties are adversely affected. Therefore, the addition amount of Al is limited to 0.005 to 0.2%.
【0025】以上の化学組成をもつステンレス鋼板に特
定表面粗度にダル加工することが耐食性と防眩性を付与
するのに必要である。ダル加工による表面粗さ(Ra)
が0.5μmより小さい場合には、太陽光線の入射角度
が60°より小さいと眩しさを感じてしまう。一方、表
面粗さが10.0μmを超えると大気暴露中に大気に浮
遊する汚染物質がたまり、耐食性が極端に低下する。し
たがって、表面粗さは0.5〜10.0μmに限定し
た。It is necessary to dull a stainless steel sheet having the above chemical composition to a specific surface roughness in order to impart corrosion resistance and anti-glare properties. Surface roughness by dull processing (Ra)
Is smaller than 0.5 μm, if the incident angle of sunlight is smaller than 60 °, glare is felt. On the other hand, when the surface roughness exceeds 10.0 μm, contaminants floating in the atmosphere during exposure to the atmosphere accumulate, and the corrosion resistance is extremely reduced. Therefore, the surface roughness was limited to 0.5 to 10.0 μm.
【0026】以上説明した成分および表面性状を有する
ステンレス鋼について、本発明では下記の処理を施すこ
とにより、防眩性および耐食性を兼ね備えた外装用ステ
ンレス鋼を製造する。In the present invention, the stainless steel having the components and surface properties described above is subjected to the following treatment to produce an exterior stainless steel having both antiglare properties and corrosion resistance.
【0027】上記ステンレス鋼にまず光輝焼鈍を施す。
光輝焼鈍はダル加工面の金属光沢および延性を回復させ
るために行なうもので、アンモニア分解ガスあるいは純
水素雰囲気中で露点−40℃以下、950〜1050℃
で行なうのがよい。The stainless steel is first subjected to bright annealing.
Bright annealing is performed to restore the metallic luster and ductility of the dulled surface, and has a dew point of −40 ° C. or less and 950 to 1050 ° C. in an ammonia decomposition gas or pure hydrogen atmosphere.
It is good to do in.
【0028】本発明では、光輝焼鈍後に400〜900
℃で再加熱し、中性塩溶液中で電気溶解することによ
り、鋼板表面の酸化スケールとともにダル加工時に形成
された倒れ込みを除去する。なお、倒れ込みとはダル加
工時に生じたもので、凹部上にオーバーハング状に張り
出した部分をいう。In the present invention, after bright annealing, 400 to 900
By reheating at ℃ and electrodissolving in a neutral salt solution, the collapse formed during the dulling process together with the oxide scale on the steel sheet surface is removed. It should be noted that the term “falling” occurs during dulling and refers to a portion that overhangs over the recess.
【0029】光輝焼鈍において確保したダル加工面の金
属光沢を再加熱・中性塩溶液中での電解工程においても
消失させないために、条件を設定した。再加熱温度が4
00℃未満であると酸化スケールの生成が少なく、その
ため溶解量が不十分であり、ダル加工時の倒れ込みを除
去できない。一方、900℃を超える温度で再加熱する
と酸化スケールが厚くなって、中性塩溶液中の電解によ
り除去できなくなる。したがって、光輝焼鈍後の再加熱
温度は400〜900℃に限定した。Conditions were set so that the metallic luster of the dulled surface secured in bright annealing was not lost even in the reheating / electrolysis step in a neutral salt solution. Reheating temperature is 4
If the temperature is lower than 00 ° C., the generation of oxide scale is small, so that the amount of dissolution is insufficient, and the collapse during dulling cannot be removed. On the other hand, when reheated at a temperature exceeding 900 ° C., the oxide scale becomes thick and cannot be removed by electrolysis in a neutral salt solution. Therefore, the reheating temperature after bright annealing was limited to 400 to 900 ° C.
【0030】次いで、中性塩溶液中で電解処理を行な
う。これはダル加工面の後処理の均一な仕上りをするた
めに行なう。中性塩としては、硫酸ソーダなどを好適に
用いることができる。電解条件について述べると、中性
塩溶液中の電解電流値が1A/dm 2 未満の場合、脱スケー
ルに時間を要するし、一方、20A/dm2 を超えると経済
性が低下する。したがって、電解電流値を1〜20A/dm
2 に限定した。電解時間は、10〜120secとする
のがよい。Next, an electrolytic treatment is performed in a neutral salt solution.
U. This provides a uniform finish of the post-processing on dull surfaces
Do it for As a neutral salt, sodium sulfate or the like is preferably used.
Can be used. Regarding electrolysis conditions, neutral
Electrolysis current value in salt solution is 1A / dm Two If less than
Takes time, while 20A / dmTwo Beyond the economy
Is reduced. Therefore, the electrolytic current value is set to 1 to 20 A / dm.
Two Limited to. The electrolysis time is 10 to 120 sec.
Is good.
【0031】上記の中性塩中での電解処理だけでは耐食
性が不十分である。そこで、ステンレス鋼板の表面のス
マットの除去と不動態化のために酸に浸漬する。用いる
酸は、硝酸と弗酸の混酸または硝酸が好ましい。混酸は
温度40〜80℃、濃度5〜25%、硝酸は温度30〜
70℃、濃度8〜20%とするのがよい。なお浸漬時間
は適宜選択すればよい。The electrolytic treatment alone in the above neutral salt is insufficient in corrosion resistance. Therefore, the stainless steel plate is immersed in an acid to remove smut and passivate the surface. The acid used is preferably a mixed acid of nitric acid and hydrofluoric acid or nitric acid. Mixed acid at a temperature of 40-80 ° C, concentration of 5-25%, nitric acid at a temperature of 30-
The temperature is preferably 70 ° C. and the concentration is 8 to 20%. Note that the immersion time may be appropriately selected.
【0032】[0032]
【実施例】以下に本発明を実施例に基づいて具体的に説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.
【0033】(実施例)第1表に示す化学組成の鋼を溶
解し、熱間圧延により、4mmの板厚の鋼板とした。1
000℃×10minの急冷の熱処理を施したのち、酸
洗および研磨により酸化スケールを除去した。これら鋼
板を0.8mmまで冷間圧延して、最終パスは表面粗さ
Raが4〜20μm のダルロールで圧延した。Example A steel having the chemical composition shown in Table 1 was melted and hot-rolled to obtain a steel plate having a thickness of 4 mm. 1
After a quenching heat treatment at 000 ° C. × 10 min, oxide scale was removed by pickling and polishing. These steel sheets were cold-rolled to 0.8 mm, and the final pass was rolled with dull rolls having a surface roughness Ra of 4 to 20 μm.
【0034】このようにダル加工された鋼板は、第2表
に示すようにして処理された。第2表のAにおいては露
点−45℃のアンモニア分解ガス雰囲気で1000℃の
熱処理(BA)を施し、室温まで冷却した後、300〜
1100℃まで100℃毎に加熱した9種類の鋼板を中
性塩溶液中で10mA/dm2×20秒の条件で電解した。そ
の後、60℃、濃度20%の混酸(硝酸:弗酸=2:
1)で酸洗した。第2表のBは上記の光輝焼鈍を施した
だけのものである。第2表のCはBA工程の代わりに1
000℃×60秒のLPG燃焼雰囲気で焼鈍後、400
℃のアルカリ溶融塩(NaOH + NaNO3)に浸漬し、濃度2
0%、80℃の硫酸、次いで20%の硝弗酸(硝酸:弗
酸=2:1、温度60℃)にそれぞれ60秒、60秒浸
漬した。得られた各鋼板について、光沢度、白色度、孔
食電位を測定した。その結果を第3表に示す。The steel sheet dulled in this way was treated as shown in Table 2. In A of Table 2, heat treatment (BA) at 1000 ° C. is performed in an ammonia decomposition gas atmosphere having a dew point of −45 ° C., and after cooling to room temperature, 300 to
Nine kinds of steel sheets heated to 1100 ° C. every 100 ° C. were electrolyzed in a neutral salt solution under the condition of 10 mA / dm 2 × 20 seconds. Then, a mixed acid (nitric acid: hydrofluoric acid = 2:
It was pickled in 1). B in Table 2 is obtained only after the above-described bright annealing. C in Table 2 is 1 instead of BA process.
After annealing in an LPG combustion atmosphere of 000 ° C. × 60 seconds, 400
Immersion in alkali molten salt (NaOH + NaNO 3 )
It was immersed in sulfuric acid at 0% and 80 ° C. and then with nitric hydrofluoric acid (nitric acid: hydrofluoric acid = 2: 1 at a temperature of 60 ° C.) for 60 seconds and 60 seconds, respectively. The gloss, whiteness, and pitting potential of each of the obtained steel sheets were measured. Table 3 shows the results.
【0035】第3表から明らかなように、本発明による
鋼板は耐食性、防眩性に優れ、色調はダル加工後光輝焼
鈍した鋼板とほぼ同等であることがわかる。As is evident from Table 3, the steel sheet according to the present invention has excellent corrosion resistance and anti-glare properties, and the color tone is almost the same as that of the steel sheet which has been dulled and bright annealed.
【0036】光沢度は、光沢計を用い、入射角20°の
条件により測定した。The gloss was measured using a gloss meter under the condition of an incident angle of 20 °.
【0037】白色度は、測色色差計を用いて、L、a、
bを測定し、ハンター式 W(Lab)=100−[(100−L)2+a2 +b2 ]1/2 により算出した。The whiteness can be measured using a colorimeter using a colorimeter L, a,
b was measured and calculated by the Hunter formula W (Lab) = 100 − [(100−L) 2 + a 2 + b 2 ] 1/2 .
【0038】[0038]
【表1】 [Table 1]
【0039】 [0039]
【0040】[0040]
【表2】 [Table 2]
【0041】[0041]
【発明の効果】本発明はステンレス鋼の化学組成をある
特定範囲に限定して、大気中の暴露における長期にわた
る耐食性を確保し、防眩性付与のためのダル加工による
耐食性の低下を、光輝焼鈍とそれに続く再加熱、さらに
は中性塩中の電解、酸法条件を工夫することにより回避
して、耐食性、防眩性に優れた低白色度のステンレス鋼
板を得ることができた。According to the present invention, the chemical composition of stainless steel is limited to a specific range to secure long-term corrosion resistance during exposure to the atmosphere, and to reduce the reduction in corrosion resistance due to dull processing for imparting antiglare properties. By avoiding annealing and subsequent reheating, and further improving the conditions of electrolysis in neutral salt and acid method, a low whiteness stainless steel sheet excellent in corrosion resistance and anti-glare properties could be obtained.
フロントページの続き (72)発明者 石 川 正 明 神戸市中央区脇浜海岸通2番88号 川崎 製鉄株式会社阪神製造所内 (72)発明者 肥 野 真 行 神戸市中央区脇浜海岸通2番88号 川崎 製鉄株式会社阪神製造所内 (56)参考文献 特開 平5−163557(JP,A) 特開 平5−163588(JP,A) 特開 平5−163587(JP,A) 特開 昭63−49305(JP,A) 特開 昭60−218498(JP,A) 特開 昭59−6398(JP,A) 特開 平6−49539(JP,A) (58)調査した分野(Int.Cl.7,DB名) C21D 8/02,9/46 C23F 1/28 C22C 38/00 - 38/22 WPI/L(QUESTEL)Continued on the front page (72) Inventor Masaaki Ishikawa 2-88, Wakihama Kaigandori, Chuo-ku, Kobe Kawasaki Steel Works Co., Ltd. Hanshin Works (72) Inventor Masayuki Hino 2-88, Wakihama-kaigandori, Chuo-ku, Kobe-shi No. Kawasaki Steel Corporation Hanshin Works (56) References JP-A-5-163557 (JP, A) JP-A-5-163588 (JP, A) JP-A-5-163587 (JP, A) JP-A-63 -49305 (JP, A) JP-A-60-218498 (JP, A) JP-A-59-6398 (JP, A) JP-A-6-49539 (JP, A) (58) Fields investigated (Int. . 7, DB name) C21D 8 / 02,9 / 46 C23F 1/28 C22C 38/00 - 38/22 WPI / L (QUESTEL)
Claims (2)
17.0〜35.0%、Mo:0.5〜4.0%、Cr
+3Mo:26〜40%、Si:0.05〜1.0%、
Mn:0.05〜0.5%、Al:0.005〜0.2
%、残部Feおよびその他不可避的不純物からなり、鋼
板の表面粗さ(Ra)が0.5〜10.0μmの冷延鋼
板を光輝焼鈍したあと、400〜900℃に再加熱し、
中性塩溶液中で1〜20A/dm2 の条件で電解を行ない、
その後硝酸と弗酸の混酸または硝酸に浸漬することを特
徴とする防眩性と耐食性を兼ね備えた外装用ステンレス
鋼板の製造方法。(1) In terms of% by weight, C: 0.020% or less, Cr:
17.0 to 35.0%, Mo: 0.5 to 4.0%, Cr
+ 3Mo: 26 to 40%, Si: 0.05 to 1.0%,
Mn: 0.05-0.5%, Al: 0.005-0.2
%, The balance being Fe and other unavoidable impurities, and after bright annealing a cold-rolled steel sheet having a surface roughness (Ra) of 0.5 to 10.0 μm, reheating to 400 to 900 ° C.
Perform electrolysis under the conditions of 1 to 20 A / dm 2 in a neutral salt solution,
A method for producing an exterior stainless steel sheet having both anti-glare properties and corrosion resistance, characterized by thereafter immersing in a mixed acid of nitric acid and hydrofluoric acid or nitric acid.
0.5%、V:0.05〜0.5%の一種以上の元素を
含有する請求項1に記載の防眩性と耐食性を兼ね備えた
外装用ステンレス鋼板の製造方法。2. Nb: 0.1-0.5%, Ti: 0.1-
The method for producing an exterior stainless steel sheet having both antiglare properties and corrosion resistance according to claim 1, which contains one or more elements of 0.5% and V: 0.05 to 0.5%.
Priority Applications (1)
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JP3330543A JP2997592B2 (en) | 1991-12-13 | 1991-12-13 | Manufacturing method of exterior stainless steel sheet having both anti-glare property and corrosion resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP3330543A JP2997592B2 (en) | 1991-12-13 | 1991-12-13 | Manufacturing method of exterior stainless steel sheet having both anti-glare property and corrosion resistance |
Publications (2)
Publication Number | Publication Date |
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JPH05163528A JPH05163528A (en) | 1993-06-29 |
JP2997592B2 true JP2997592B2 (en) | 2000-01-11 |
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JP3330543A Expired - Lifetime JP2997592B2 (en) | 1991-12-13 | 1991-12-13 | Manufacturing method of exterior stainless steel sheet having both anti-glare property and corrosion resistance |
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JP6584900B2 (en) * | 2015-10-05 | 2019-10-02 | 日鉄日新製鋼株式会社 | Stainless steel pipe excellent in corrosion resistance and manufacturing method thereof |
CN110528058A (en) * | 2019-08-29 | 2019-12-03 | 浦项(张家港)不锈钢股份有限公司 | A kind of 254SMo stainless steel surface pit defect ameliorative way |
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