JP2003138350A - Alloy having excellent hot dip zinc corrosion resistance - Google Patents
Alloy having excellent hot dip zinc corrosion resistanceInfo
- Publication number
- JP2003138350A JP2003138350A JP2001335619A JP2001335619A JP2003138350A JP 2003138350 A JP2003138350 A JP 2003138350A JP 2001335619 A JP2001335619 A JP 2001335619A JP 2001335619 A JP2001335619 A JP 2001335619A JP 2003138350 A JP2003138350 A JP 2003138350A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion resistance
- present
- alloy
- ferrite
- hot dip
- 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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- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は溶融亜鉛メッキ処
理に際して用いられるシンクロール，サポートロール等
の材料として好適な耐溶融亜鉛腐食性に優れた合金に関
する。
【０００２】
【従来の技術及び発明が解決しようとする課題】例えば
鋼板を溶融亜鉛に浸漬して亜鉛メッキ鋼板を得る工程等
で用いられるシンクロール，サポートロール等の溶融亜
鉛メッキ処理設備の装置部品、詳しくは溶融亜鉛に接触
する装置部品には優れた耐溶融亜鉛腐食性が求められ
る。
【０００３】従来、そのための材料として次のような組
成を有するもの、即ち重量％でC：０．０７〜０．１２
％，Si：０．８０〜１．２０％，Mn：０．６〜１．０
％，P：≦０．０４０％，S ：≦０．０４０％，Cu：≦
０．３０％，Ni：≦０．５０％，Cr：１０．５０〜１
２．００％の組成を有するマルテンサイト系のステンレ
ス鋼材が用いられていた。
【０００４】ところで、従来の溶融亜鉛メッキにおいて
は通常の場合にZn-０．２重量％Alから成る溶融亜鉛浴
が使用されていたが、近年になって亜鉛メッキ層の高級
化、即ち耐食性のより一層の向上のために溶融亜鉛浴中
のAl添加量を多くする傾向があり、溶融亜鉛メッキ処理
設備の装置部品等に対する腐食環境が厳しくなって来て
いる。このため、溶融亜鉛メッキ処理設備の装置部品を
構成するための材料に従来に増して高い耐溶融亜鉛腐食
性が求められるようになって来ている。
【０００５】
【課題を解決するための手段】本発明の耐溶融亜鉛腐食
性に優れる合金はこのような課題を解決するために案出
されたものである。而して請求項１のものは、重量％で
C ：０．１０〜０．１５％，Si：１．３０〜２．００
％，Mn：１．５０〜２．５０％未満，P ：≦０．０４０
％，S ：≦０．０４０％，Cu：≦０．３０％，Ni：０．
３０〜１．００％，Cr：１０．５０〜１２．００％，N
：０．０２〜０．０６％残部実質的にFeの組成を有
し、且つ次式（１）で表されるフェライト係数が１．０
以下であることを特徴とする。
(Cr＋1.5Si−4.99)／(Ni＋30C＋0.5Mn＋26（N−0.02）＋2.77)・・・（１）
【０００６】
【作用及び発明の効果】以上のように本発明は、上記従
来の材料に対してSi含有量を高含有量となし、耐溶融亜
鉛腐食性を高めるようになしたものである。但し単にSi
の含有量を高くしただけであると材料の靭性（衝撃値）
が低下してしまう。
【０００７】本発明の材料はマルテンサイト系材料であ
り、これに対してSiはフェライト生成元素として知られ
た元素で、Siの含有量を高くするとフェライトが生成し
易くなって、これにより材料の靭性が低下してしまうの
である。而して靭性が低下すると、例えば上記シンクロ
ールやサポートロール等において、ロール製造の過程で
軸の部分等で折損が生じ易くなる。
【０００８】要するに本発明は、Si含有量を多くするこ
とで耐溶融亜鉛腐食性を高める一方、Si含有量を多くす
ることに伴って生ずるフェライトの生成し易さの問題、
具体的にはフェライトの生成によって材料の靭性が低下
する問題の解決を図ったもので、そこで本発明ではオー
ステナイト生成元素であるMn，Nを従来よりも多量に含
有させ、また併せて同じくオーステナイト生成元素であ
るNi，更にCの添加レンジを従来よりも高めのレンジに
設定したものである。
【０００９】言って見れば、これらMn，N，Ni，C等によ
りフェライトの生成を抑制することで、フェライト生成
元素であるSiの高添加を可能とし、これによって靭性を
確保しつつ耐溶融亜鉛腐食性を高め得た点に本発明の特
徴が存する。かかる本発明によれば、従来に増して耐溶
融亜鉛腐食性の高い材料を提供することができる。
【００１０】かかる本発明では、次式（１）で表される
フェライト係数が１．０以下となるように各成分を調整
することが必要である。
(Cr＋1.5Si−4.99)／(Ni＋30C＋0.5Mn＋26（N−0.02）＋2.77)・・・（１）
【００１１】次に本発明における各化学成分の限定理由
を以下に詳述する。
C :０．１０〜０．１５％
Cが０．１０％より少ないとフェライト量増加により耐
溶融亜鉛腐食性が低下する。また一方０．１５％を超え
て多く含有させると、CrとCとが結合して炭化物を析出
し、溶融亜鉛に対する腐食抵抗性が低下する。そこで本
発明ではCの含有量を上記範囲内とする。
【００１２】Si：１．３０〜２．００％
溶融亜鉛に対する腐食抵抗性の向上の効果を出すために
はSiを１．３０％以上含有させる必要がある。一方２．
００％を超えて含有させると衝撃値の低下をもたらす。
そこで本発明ではSiの含有量を上記範囲とする。
【００１３】Mn：１．５０〜２．５０％未満
Mnの添加は、Siを高添加することでフェライト量が増加
し、耐溶融亜鉛腐食性が低下するのを抑制する効果があ
る。但しそのためには１．５０％以上含有させる必要が
ある。一方２．５０％以上含有させると鋳造時の鋳型溶
損による異物かみの問題が発生する。またMnは酸化され
易い元素であり、これを多量に含有させると鋼の清浄度
が低下してしまう。そこで本発明ではMnを２．５０％未
満の量で含有させるようにする。
【００１４】Ni：０．３０〜１．００％
Niが０．３０％よりも少ないとフェライト量の増加によ
り耐溶融亜鉛腐食性が低下する。また一方、１．００％
を超えて多量に含有させた場合においても同様に溶融亜
鉛に対する腐食抵抗性の低下をもたらす。そこで本発明
ではNiを０．３０〜１．００％の範囲とする。
【００１５】Cr：１０．５０〜１２．００％
溶融亜鉛に対する腐食抵抗性の向上の効果を出すために
Crは１０．５０％以上含有させる必要がある。一方、１
２．００％を超えて含有させると衝撃値の低下をもたら
すため上限を１２．００％とする。
【００１６】N：０．０２〜０．０６％
フェライト量の増加により耐溶融亜鉛腐食性が低下する
のを防ぐため、本発明ではNを０．０２％以上含有させ
る。一方、０．０６％を超えて含有させると鋳造時にブ
ローホールを発生するため、上限を０．０６％とする。
【００１７】尚P，S，Cuは不純物となるものであって、
Pについては０．０４０％以下、Sについては０．０４０
％以下，Cuについては０．３０％以下にそれぞれ規制す
る。
【００１８】フェライト係数：１．０以下
(Cr＋1.5Si−4.99)／(Ni＋30C＋0.5Mn＋26（N−0.02）＋2.77)・・・（１）
上記式（１）で表されるフェライト係数が１．０よりも
大になると、フェライト量の増加により耐溶融亜鉛腐食
性が低下するため、本発明ではフェライト係数を１．０
以下に規制する。
【００１９】
【実施例】次に本発明の実施例を以下に詳述する。表１
に示す成分の鋼を高周波誘導炉で溶解し、φ５０×２０
０ｍｍの鋳型に鋳造した。そして鋳造後、１０５０℃で
１時間保持したのち衝風冷却を行い、続いて７００℃×
１時間の条件で加熱したのち炉内冷却を行った。そして
これより試験片を取り出し耐食性試験，衝撃試験を実施
し、それらの特性について評価した。その評価の結果が
表１に併せて示してある。
【００２０】
【表１】
【００２１】尚耐食性試験は、試験片を４８０℃に加熱
したZn-０．２％Al浴に１００時間浸漬し、その減耗量
を計測することにより行った。判定は次のようにして行
った。
◎；５ｇ／ｍ２ｈ以下， ○；１０ｇ／ｍ２ｈ以下，
×；１０ｇ／ｍ２ｈを超える。
【００２２】一方衝撃試験はＪＩＳ Ｚ ２２０２ ２
ｍｍＶノッチ試験片を５本作成し、ＪＩＳ Ｚ ２２４
２に従って衝撃試験を常温で行い、その平均値を取って
以下の基準で評価を行った。
シャルピー吸収エネルギー ◎；５０Ｊ以上， ○；
３０Ｊ以上 ×；３０Ｊ未満。
【００２３】以上の結果に見られるように、Siを多く含
有させ且つ他の成分の調整によってフェライト係数を
１．０以下となしてある本実施例の場合、耐食性，衝撃
値，製造性ともに何れも良好となっているのに対し、比
較例のものはそれらの何れかの特性において不満足なも
のとなっている。
【００２４】具体的には、Mnの含有量が本発明の範囲を
超えて多い比較例２では製造性が悪化しており、またC
の含有量が本発明の上限である０．１５％よりも多い比
較例４の場合、耐食性が悪くなっている。
【００２５】またSiの含有量が本発明の下限値よりも少
ない１．２０％の比較例５の場合には耐食性が悪く、ま
た逆にSiの含有量が本発明の上限値である２．０％を超
えて多く含有されている比較例６の場合、衝撃値が悪く
なっている。
【００２６】更にNiの含有量が本発明の上限値である
１．０％よりも多い１．０３％である比較例８の場合、
耐食性が悪く、またNの含有量が本発明の上限値よりも
多い０．０６３％である比較例１０の場合製造性が悪く
なっている。
【００２７】またC及びCrの含有量が本発明の下限値よ
りも少なく、更にまたフェライト係数が１．０％よりも
大である比較例１１の場合、衝撃値は良好なものの、耐
食性が悪くなっている。
【００２８】これに対して本発明の範囲内の各実施例の
ものは耐食性，衝撃値，製造性の何れもが良好である。
【００２９】以上本発明の実施例を詳述したがこれはあ
くまで一例示であり、本発明はその主旨を逸脱しない範
囲において種々変更を加えた態様で実施可能である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloy having excellent hot-dip galvanized corrosion resistance suitable as a material for a sink roll, a support roll and the like used in hot-dip galvanizing. 2. Description of the Related Art Equipment parts of a hot-dip galvanizing equipment such as a sink roll and a support roll used in a process of obtaining a galvanized steel sheet by dipping a steel sheet in molten zinc, for example. In particular, equipment parts that come into contact with molten zinc are required to have excellent resistance to molten zinc corrosion. Heretofore, as a material for this purpose, a material having the following composition, that is, C: 0.07 to 0.12 by weight%
%, Si: 0.80 to 1.20%, Mn: 0.6 to 1.0
%, P: ≦ 0.040%, S: ≦ 0.040%, Cu: ≦
0.30%, Ni: 0.50%, Cr: 10.50-1
A martensitic stainless steel material having a composition of 2.00% has been used. [0004] In the conventional hot-dip galvanizing, a hot-dip zinc bath made of Zn-0.2% by weight Al has been used in the usual case. There is a tendency to increase the amount of Al added to the hot-dip galvanizing bath for further improvement, and the corrosive environment for the components of the hot-dip galvanizing equipment has become severe. For this reason, materials for forming the equipment parts of the hot-dip galvanizing treatment equipment have been required to have higher hot-dip galvanized corrosion resistance than ever before. [0005] The alloy of the present invention having excellent resistance to molten zinc corrosion has been devised to solve such a problem. Thus, what is claimed in claim 1 is in weight%.
C: 0.10 to 0.15%, Si: 1.30 to 2.00
%, Mn: 1.50 to less than 2.50%, P: ≦ 0.040
%, S: ≦ 0.040%, Cu: ≦ 0.30%, Ni: 0.
30 to 1.00%, Cr: 10.50 to 12.00%, N
: 0.02-0.06% balance Substantially Fe composition, and the ferrite coefficient represented by the following formula (1) is 1.0
It is characterized by the following. (Cr + 1.5Si−4.99) / (Ni + 30C + 0.5Mn + 26 (N−0.02) +2.77) (1) [Action and Effect of the Invention] As described above, the present invention relates to the above-mentioned conventional material. On the other hand, the Si content is made high to enhance the corrosion resistance to molten zinc. However, simply Si
To increase the toughness of the material (impact value)
Will decrease. [0007] The material of the present invention is a martensitic material, whereas Si is an element known as a ferrite-forming element. When the content of Si is increased, ferrite is likely to be formed. The toughness is reduced. When the toughness is reduced, for example, in the above-mentioned sink roll, support roll, or the like, breakage is likely to occur at a shaft portion or the like in the roll manufacturing process. [0008] In short, the present invention is to improve the corrosion resistance to molten zinc by increasing the Si content, while at the same time the problem of easy formation of ferrite caused by increasing the Si content,
Specifically, the present invention has solved the problem that the toughness of the material is reduced by the formation of ferrite. Therefore, in the present invention, Mn and N, which are austenite forming elements, are contained in a larger amount than in the prior art. The addition range of the elements Ni and C is set to be higher than before. In other words, by suppressing the formation of ferrite by these Mn, N, Ni, C, etc., it is possible to add Si, which is a ferrite-forming element, at a high content, thereby securing the toughness while maintaining the toughness. The feature of the present invention lies in that the corrosiveness can be enhanced. According to the present invention, it is possible to provide a material having higher resistance to molten zinc corrosion than ever before. In the present invention, it is necessary to adjust each component so that the ferrite coefficient represented by the following equation (1) becomes 1.0 or less. (Cr + 1.5Si-4.99) / (Ni + 30C + 0.5Mn + 26 (N-0.02) +2.77) (1) Next, the reasons for limiting each chemical component in the present invention will be described in detail below. C: 0.10 to 0.15% If C is less than 0.10%, the molten zinc corrosion resistance decreases due to an increase in the amount of ferrite. On the other hand, if it is contained more than 0.15%, Cr and C combine to precipitate carbides, and the corrosion resistance to molten zinc decreases. Therefore, in the present invention, the content of C is set within the above range. Si: 1.30 to 2.00% In order to obtain the effect of improving the corrosion resistance to molten zinc, it is necessary to contain 1.30% or more of Si. On the other hand, 2.
If the content exceeds 00%, the impact value is reduced.
Therefore, in the present invention, the content of Si is set to the above range. Mn: less than 1.50 to 2.50% Addition of Mn has an effect of suppressing an increase in the amount of ferrite and a decrease in corrosion resistance to molten zinc by adding Si at a high content. However, for that purpose, it is necessary to contain 1.50% or more. On the other hand, if it is contained at 2.50% or more, a problem of foreign matter biting due to melting of the mold during casting occurs. In addition, Mn is an element that is easily oxidized, and if it is contained in a large amount, the cleanliness of steel decreases. Therefore, in the present invention, Mn is contained in an amount of less than 2.50%. Ni: 0.30 to 1.00% If Ni is less than 0.30%, the corrosion resistance to molten zinc decreases due to an increase in the amount of ferrite. On the other hand, 1.00%
When a large amount is contained in excess of the above, the corrosion resistance to molten zinc is similarly reduced. Therefore, in the present invention, Ni is set in the range of 0.30 to 1.00%. Cr: 10.50 to 12.00% In order to improve the corrosion resistance to molten zinc
Cr must be contained at 10.50% or more. Meanwhile, 1
When the content exceeds 2.00%, the impact value is reduced, so the upper limit is set to 12.00%. N: 0.02 to 0.06% In order to prevent the molten zinc corrosion resistance from decreasing due to an increase in the amount of ferrite, N is contained in the present invention in an amount of 0.02% or more. On the other hand, if the content exceeds 0.06%, blow holes are generated during casting, so the upper limit is made 0.06%. Note that P, S, and Cu are impurities.
0.040% or less for P, 0.040% for S
% And Cu are regulated to 0.30% or less, respectively. Ferrite coefficient: 1.0 or less (Cr + 1.5Si−4.99) / (Ni + 30C + 0.5Mn + 26 (N−0.02) +2.77) (1) The ferrite coefficient represented by the above formula (1) is 1 If the ferrite coefficient is larger than 0.0, the zinc corrosion resistance decreases due to an increase in the amount of ferrite.
It is regulated as follows. Next, embodiments of the present invention will be described in detail. Table 1
The steel of the composition shown in the following was melted in a high frequency induction furnace,
It was cast into a 0 mm mold. And after casting, after holding at 1050 ° C. for 1 hour, blast cooling was performed.
After heating for 1 hour, the inside of the furnace was cooled. Then, the test piece was taken out from this and subjected to a corrosion resistance test and an impact test, and their characteristics were evaluated. The results of the evaluation are also shown in Table 1. [Table 1] The corrosion resistance test was carried out by immersing the test piece in a Zn-0.2% Al bath heated to 480 ° C. for 100 hours, and measuring the amount of wear. The judgment was made as follows. ◎: 5 g / m 2 h or less, ○: 10 g / m 2 h or less,
×: Exceeds 10 g / m 2 h. On the other hand, the impact test was conducted according to JIS Z 22022.
Five mmV notch test pieces were prepared, and JIS Z224
The impact test was carried out at room temperature according to No. 2, and the average value was evaluated based on the following criteria. Charpy absorbed energy ◎; 50 J or more, ○;
30 J or more ×; less than 30 J. As can be seen from the above results, in this embodiment in which a large amount of Si is contained and the ferrite coefficient is adjusted to 1.0 or less by adjusting other components, any of the corrosion resistance, the impact value, and the manufacturability can be reduced. Of the comparative examples are unsatisfactory in any of those characteristics. Specifically, in Comparative Example 2 in which the content of Mn is larger than the range of the present invention, the productivity is deteriorated, and
In Comparative Example 4 in which the content of is higher than the upper limit of the present invention, 0.15%, the corrosion resistance was poor. In the case of Comparative Example 5 in which the Si content is 1.20%, which is lower than the lower limit of the present invention, the corrosion resistance is poor, and conversely, the Si content is the upper limit of the present invention. In the case of Comparative Example 6 containing more than 0%, the impact value was poor. Further, in the case of Comparative Example 8 in which the content of Ni is 1.03%, which is more than the upper limit of 1.0% according to the present invention,
In the case of Comparative Example 10 in which the corrosion resistance is poor and the content of N is 0.063%, which is higher than the upper limit of the present invention, the productivity is poor. In Comparative Example 11 in which the contents of C and Cr are lower than the lower limits of the present invention and the ferrite coefficient is higher than 1.0%, the impact value is good, but the corrosion resistance is poor. Has become. On the other hand, each of the embodiments within the scope of the present invention has good corrosion resistance, impact value and manufacturability. Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be implemented in variously modified forms without departing from the gist thereof.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長尾 貴文 愛知県名古屋市港区竜宮町10番地 大同特 殊鋼株式会社築地工場内 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takafumi Nagao 10 Ryugucho, Minato-ku, Nagoya City, Aichi Prefecture Juki Steel Co., Ltd.
Claims (1)
るフェライト係数が１．０以下であることを特徴とする
耐溶融亜鉛腐食性に優れる合金。 (Cr＋1.5Si−4.99)／(Ni＋30C＋0.5Mn＋26（N−0.02）＋2.77)・・・（１）Claims: C: 0.10 to 0.15% in weight% Si: 1.30 to 2.00% Mn: less than 1.50 to 2.50% P: ≦ 0. 040% S: ≤ 0.040% Cu: ≤ 0.30% Ni: 0.30 to 1.00% Cr: 10.50 to 12.00% N: 0.02 to 0.06% The balance substantially An alloy having an Fe composition and having a ferrite coefficient represented by the following formula (1) of 1.0 or less, and having excellent corrosion resistance to molten zinc. (Cr + 1.5Si−4.99) / (Ni + 30C + 0.5Mn + 26 (N−0.02) +2.77) ・ ・ ・ (1)
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| JP2001335619A JP3835251B2 (en) | 2001-10-31 | 2001-10-31 | Alloy with excellent resistance to molten zinc corrosion |
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| JP2001335619A JP3835251B2 (en) | 2001-10-31 | 2001-10-31 | Alloy with excellent resistance to molten zinc corrosion |
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| JP2003138350A true JP2003138350A (en) | 2003-05-14 |
| JP3835251B2 JP3835251B2 (en) | 2006-10-18 |
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Cited By (2)
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|---|---|---|---|---|
| WO2018216589A1 (en) * | 2017-05-24 | 2018-11-29 | トーカロ株式会社 | Member for hot-dip metal plating bath |
| CN113667889A (en) * | 2021-07-16 | 2021-11-19 | 河钢股份有限公司承德分公司 | High-strength wear-resistant corrosion-resistant sink roller and production method thereof |
-
2001
- 2001-10-31 JP JP2001335619A patent/JP3835251B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018216589A1 (en) * | 2017-05-24 | 2018-11-29 | トーカロ株式会社 | Member for hot-dip metal plating bath |
| JP2018197390A (en) * | 2017-05-24 | 2018-12-13 | トーカロ株式会社 | Member for hot-dip metal plating bath |
| CN110678567A (en) * | 2017-05-24 | 2020-01-10 | 东华隆株式会社 | Component for molten metal plating bath |
| TWI697569B (en) * | 2017-05-24 | 2020-07-01 | 日商東華隆股份有限公司 | Components for molten metal electroplating bath |
| US11193195B2 (en) | 2017-05-24 | 2021-12-07 | Tocalo Co., Ltd. | Component for hot-dip metal plating bath |
| CN113667889A (en) * | 2021-07-16 | 2021-11-19 | 河钢股份有限公司承德分公司 | High-strength wear-resistant corrosion-resistant sink roller and production method thereof |
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| Publication number | Publication date |
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| JP3835251B2 (en) | 2006-10-18 |
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