JPS5939498B2 - Hot dip resistant zinc alloy steel - Google Patents
Hot dip resistant zinc alloy steelInfo
- Publication number
- JPS5939498B2 JPS5939498B2 JP9566581A JP9566581A JPS5939498B2 JP S5939498 B2 JPS5939498 B2 JP S5939498B2 JP 9566581 A JP9566581 A JP 9566581A JP 9566581 A JP9566581 A JP 9566581A JP S5939498 B2 JPS5939498 B2 JP S5939498B2
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- Prior art keywords
- weight
- steel
- corrosion
- alloy steel
- zinc alloy
- Prior art date
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Description
【発明の詳細な説明】
本発明は主として溶融亜鉛メッキに使用する耐 ３溶融
亜鉛合金鋼に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 3-resistant hot-dip zinc alloy steel mainly used for hot-dip galvanizing.
従来、耐溶融亜鉛鋼としては純鉄およびＣｒ約２４重量
％、Ｎｉ約１２重量％、その他少量成分を含むいわゆる
レザロイ系合金鋼が用いられてきた。Conventionally, as molten-dip resistant zinc steel, pure iron and so-called resalloy alloy steel containing about 24% by weight of Cr, about 12% by weight of Ni, and other minor components have been used.
しかしながら、純鉄を用いた場合、亜鉛との合 ３金生
成に基づく腐食は接触面について一様に起こるがその進
行速度は速く、またレザロイ系合金を使用した場合、腐
食進行速度は遅くなるが、部分的に虫食い伏の腐食（点
食）を生じ、そのため、耐用期間が短縮され、しかも、
その推定が困難であつた。溶融亜鉛とそれに接する鋼と
の間には、これらの合金鋼が生成していることは周知の
ととおりで、通常の０．２〜０．３重量％のアルミニウ
ムを含む溶融亜鉛の場合（アルミニウムは亜鉛メッキ鉄
板合金層の組成を変え、合金層を薄くするために用いら
れる）、メッキ用地鉄の場合と違つて、溶融亜鉛浴槽の
場合、長時間にわたり、溶融亜鉛と接触するので、合金
層の組成は、耐食性に貢献しないＦｅ２（ＡｌＺｎ）５
を生成し安定合金層になつている。However, when pure iron is used, corrosion due to the formation of an alloy with zinc occurs uniformly on the contact surface, but the rate of corrosion is rapid, and when a leatherloid alloy is used, the rate of corrosion is slow, but the rate of corrosion is slow. , partial corrosion (pitting) occurs, which shortens the service life, and
It was difficult to estimate. It is well known that these alloy steels are formed between molten zinc and the steel in contact with it. is used to change the composition of the galvanized iron plate alloy layer and make the alloy layer thinner). Unlike the case of base iron for plating, in the case of a molten zinc bath, the alloy layer is in contact with the molten zinc for a long period of time. The composition of Fe2(AlZn)5 does not contribute to corrosion resistance.
This produces a stable alloy layer.
しかして、本発明者の研究によると、理由は明白でない
が、溶融亜鉛中の鉄含有量が多いと、腐食が促進される
ことが認められる。それゆえ、溶融亜鉛中の鉄分を減ら
すことが望ましい。本発明の目的は、耐食性の大きい、
特に虫食い状腐食を起こさない合金鋼を提供することで
あるが、この目的達成のため、本発明者は従来市場に現
われた各種の合金鋼について、腐食試験を行い、１７Ｃ
ｒ１０Ｍｎ合金鋼が最も優れた耐食性を示し、かつ、虫
食い状腐食が起こらぬことをみ出した。However, according to research conducted by the present inventors, it has been found that corrosion is accelerated when the iron content in molten zinc is high, although the reason is not clear. Therefore, it is desirable to reduce the iron content in molten zinc. The purpose of the present invention is to provide high corrosion resistance.
In particular, the purpose of the present inventor is to provide an alloy steel that does not cause worm-like corrosion.
It has been found that r10Mn alloy steel exhibits the best corrosion resistance and does not cause vermiform corrosion.
また、この組成を基にしてさらに研究を進入Ｎｂを含有
させるとさらに耐食性が増すことをみ出し、本発明を完
成した。すなわち、本発明はＣ０．３〜０．５重量％、
５１１．５重量％以下、Ｍｎ８．０〜１２．０重量％、
Ｐｏ、０４％以下、５０．０４重量％以下、Ｎｉ２．０
〜３．０重量％、Ｃに１５．０〜１９．０重量％、Ｎｏ
、２％以下を含有することを特徴とする合金鋼（本明細
書で１７Ｃｒ１０Ｍｎ２．５Ｎｉ鋼という）を特定発明
としている。Furthermore, based on this composition, further research was conducted and it was found that the corrosion resistance was further increased by incorporating Nb, and the present invention was completed. That is, in the present invention, C0.3 to 0.5% by weight,
511.5% by weight or less, Mn 8.0 to 12.0% by weight,
Po, 04% or less, 50.04% by weight or less, Ni2.0
~3.0% by weight, 15.0~19.0% by weight in C, No.
, 2% or less (herein referred to as 17Cr10Mn2.5Ni steel) is a specified invention.
本発明の１７Ｃｒ−１０Ｍｎ鋼は本来、１８Ｃｒ−８Ｎ
ｉ耐熱鋼の代替品として、開発され高温耐摩耗性を有す
るため例えば、高炉のアーマープレート用に使用されて
いるものであるが、耐溶融亜鉛鋼としての耐食効果は、
まつたく知られていない。The 17Cr-10Mn steel of the present invention is originally 18Cr-8N
It has been developed as a substitute for heat-resistant steel and is used, for example, in blast furnace armor plates due to its high-temperature wear resistance, but its corrosion resistance as hot-dip zinc steel is
Not really known.
次に、従来使用された純鉄、レザロイ合金および、溶融
亜鉛メツキ槽内ロール材料として特開昭５４−１０４４
６０号で公開された１３Ｃｒ鋼と本発明耐溶融亜鉛鋼と
の耐食性の差異を実験例を用いて説明する。実験に用い
た試験片の組成と熱処理方法を第１表に示す。Next, the conventionally used pure iron, Rezalloy alloy, and JP-A-54-1044 were used as roll materials for hot dip galvanizing tanks.
The difference in corrosion resistance between the 13Cr steel disclosed in No. 60 and the hot dip resistant zinc steel of the present invention will be explained using an experimental example. Table 1 shows the composition and heat treatment method of the test pieces used in the experiment.
溶融亜鉛浴の組成は、現場における実伏と鉄含有量によ
る腐食促進を考慮に入れて、（Ｚｎ９９．７重量％＋Ａ
′０．３重量（ｆ））、（Ｚｎ９８．７重量％＋ＡｌＯ
．３重量％＋Ｆｅｌ．Ｏ重量％）、（Ｚｎ９８．２重量
％＋ＡＩＯ．３重量％＋Ｆｅｌ．５重量％）、（Ｚｎ９
７．７重量７０＋ＡｌＯ．３重量７０＋Ｆｅ２．Ｏ重量
７０）の４種を用い、浴温を５００℃として１５×１５
×１５ｍ鍵の試験片を用い、５日および１０日後の腐食
百分率（−′△Ｗ／Ｗ×１００）を求め、また、虫食い
状腐食を観察した。第２表に示した結果から明らかなよ
うに、純鉄の場合、虫食い状腐食はないが、腐食速度が
大きく、１３Ｃｒ鋼は、鉄を含有している浴の場合、耐
食性を示すが、鉄の含有量が少ない場合（特に鉄を含ま
ぬ場合）耐食性が非常に悪い。The composition of the molten zinc bath was determined by taking into account actual conditions in the field and corrosion acceleration due to iron content.
'0.3 weight (f)), (Zn98.7 weight% + AlO
．． 3% by weight+Fel. O weight%), (Zn98.2 weight% + AIO.3 weight% + Fel.5 weight%), (Zn9
7.7 Weight 70+AlO. 3 weight 70+Fe2. Using four types of O weight 70), the bath temperature was 500°C and
Using a test piece of ×15 m key, the corrosion percentage (-′ΔW/W×100) after 5 and 10 days was determined, and moth-eaten corrosion was observed. As is clear from the results shown in Table 2, in the case of pure iron, there is no vermiform corrosion, but the corrosion rate is high, and 13Cr steel exhibits corrosion resistance in a bath containing iron, but When the content of iron is low (especially when it does not contain iron), the corrosion resistance is very poor.
また、レザロイの場合、耐食性は良好であるが虫食い状
腐食が激しく、そゐため耐用期間が短かくなつている。
Ｎｌを含まぬ２４Ｃｒ鋼は虫食い状腐食は起こらないが
、耐食性はレザロイに比べて劣り、したがつてＮｉは腐
食性は減するが、虫食い状腐食の原因となるものと推定
される。また合金鋼中にＡｌを含有せしめても、耐溶融
亜鉛性を増加しないことは２４Ｃｒ２Ａ１鋼の実験によ
り明らかである〇一方、Ｎｉをさらに少なくし、そのか
わりに、Ｍｎを含む１７Ｃｒ１０Ｍｎ２，５Ｎｉ鋼は、
虫食い腐食を起こさず、腐食率がほぼレザロイに匹敵す
る、したがつて、腐食しろを考慮する必要のない耐溶融
亜鉛鋼であることがわかつた。本発明の耐溶融亜鉛鋼で
、ＣＳＳｉ．．Ｐ，．ＳｌＮについてその含有量に制限
を付したのは、Ｃについては、機械的強度を保持させる
ためであり、その他の成分については、少量であること
が望ましいが、機械的、熱的、耐溶融亜鉛的性質を、実
質的に損わない最大許容量である。In addition, in the case of Leatheralloy, although it has good corrosion resistance, it suffers from severe moth-eaten corrosion, which shortens its useful life.
24Cr steel, which does not contain Nl, does not cause worm-eaten corrosion, but its corrosion resistance is inferior to that of Retherloy, and therefore, although Ni is less corrosive, it is presumed to cause worm-eaten corrosion. Furthermore, it is clear from experiments on 24Cr2A1 steel that even if Al is contained in alloy steel, the molten zinc resistance does not increase. On the other hand, it is clear from experiments with 24Cr2A1 steel that even if Al is contained in alloy steel, Ni steel is further reduced and 17Cr10Mn2,5Ni steel containing Mn is added. teeth,
It was found that it is a hot-dip zinc steel that does not cause moth-eaten corrosion and has a corrosion rate that is almost comparable to Rezaloy, so there is no need to consider corrosion margins. With the hot dip resistant zinc steel of the present invention, CSSi. ．． P. The reason for limiting the content of SlN is to maintain mechanical strength for C, and for other components, it is desirable to have a small amount, but mechanical, thermal, molten zinc resistance This is the maximum allowable amount without substantially impairing the physical properties.
次に、Ｍｎ．．Ｎｌ、Ｃｒについてはその含有率をそれ
ぞれ、８．０〜１２．０重量７０１２．０〜３．０重量
％、１５．０〜１９．０重量？に変化させても、耐溶融
亜鉛性、機械的および耐熱的性質に、実質的な違いはな
い。Next, Mn. ．． The contents of Nl and Cr are 8.0 to 12.0% by weight, 7012.0 to 3.0% by weight, and 15.0 to 19.0% by weight, respectively. There is no substantial difference in molten zinc resistance, mechanical and heat resistance properties.
本発明者は上記１７Ｃｒ１０Ｍｎ２．５Ｎ！耐溶融亜鉛
合金鋼の腐食性をさらに向上させる目的で研究を続け、
前記組成物に、さらにＮｂを０．３〜１．０重量７０含
有せしめると、溶融亜鉛による腐食がさらに減少するこ
とをみ出した（本明細書では、このＮｂ含有合金を１７
Ｃｒ１０Ｍｎ２．５ＮｉＮｂ鋼という）。The present inventor has developed the above 17Cr10Mn2.5N! We continue our research with the aim of further improving the corrosion resistance of hot-dip zinc alloy steel.
It has been found that corrosion by molten zinc is further reduced when the composition further contains 0.3 to 1.0% Nb (in this specification, this Nb-containing alloy is added to 17% by weight).
(referred to as Cr10Mn2.5NiNb steel).
第１表および第２表のそれぞれ最下段に示したゼータが
、その効果を示し、Ｎｂの存在により、耐食性が増すこ
とが明白である。すなわち、たとえば、（Ｚｎ９７７％
＋ＡｌＯ．３７Ｏ＋Ｆｅｌ．Ｏ％）の場合を比較すれば
、試１験期間５日および１０日で、１７Ｃｒ１０Ｍｎ２
．５Ｎｉ鋼の腐食率がそれぞれ１７％および３７７０で
あるが、１７Ｃｒ１０Ｍｎ２．５ＮｉＮｂ鋼の腐食率は
それぞれ１５％および３２％に減つているが、他の場合
もほぼ同じ傾向を示している。また、実験結果によると
、Ｎｂの含有量は０．３重量％までは耐食性が増加する
が、０．３〜１．１重量？では、その効果は大差ない。
一方Ｎｂの含有量が０．１重量７０未満では効果が少な
いので、０．１〜１．０重量７０の使用が経済的見地か
ら望ましい。次に本発明の耐溶融亜鉛鋼の実用試験の結
果を示す。１７Ｃｒ１０Ｍｎ２．５Ｎｉ鋼および１７Ｃ
ｒ１０Ｍｒ１２，５ＮｉＮｂ鋼を用いて溶融亜鉛メツキ
槽用のスナウトを鋳造し、４８０℃で０．３重量％のＡ
ｌを含む溶融亜鉛浴に使用した。Zeta shown at the bottom of Tables 1 and 2 shows this effect, and it is clear that the presence of Nb increases corrosion resistance. That is, for example, (Zn977%
+AlO. 37O+Fel. 0%), 17Cr10Mn2 during the 1st test period of 5 and 10 days.
．． The corrosion rates of 5Ni steel are 17% and 3770, respectively, while the corrosion rates of 17Cr10Mn2.5NiNb steel are reduced to 15% and 32%, respectively, but the other cases show almost the same trend. Also, according to the experimental results, corrosion resistance increases with Nb content up to 0.3% by weight, but 0.3 to 1.1% by weight? So, the effect is not that different.
On the other hand, if the Nb content is less than 0.1% by weight, the effect is small, so it is desirable from an economic standpoint to use a Nb content of 0.1 to 1.0% by weight. Next, the results of a practical test of the hot dip resistant zinc steel of the present invention will be shown. 17Cr10Mn2.5Ni steel and 17C
A snout for a hot-dip galvanizing tank was cast using r10Mr12,5NiNb steel and 0.3% by weight of A at 480°C.
It was used in a molten zinc bath containing l.
この場合、従来のレザロイを用いた場合、スナウトの虫
食い状腐食を生ずる期間が３〜６ケ月であるのに対し、
１７Ｃｒ１０Ｍｎ２．５Ｎｉ鋼の場合６ケ月使用しても
虫食い状腐食は生ぜず肉厚減少も認められず、１７Ｃｒ
１０Ｍｎ２．５ＮｉＮｂ鋼の場合、８ケ月使用しても虫
食い状腐食は生ぜず肉厚減少も起つていない。上記説明
から明らかなように本発明にかかる１７Ｃｒ１０Ｍｎ２
．５Ｎｉ鋼および、その成分をさらに限定した１７Ｃｒ
１０Ｍｎ２．５ＮｉＮｂ鋼は耐溶融亜釦鋼として、新規
に発明されたもので、亜鉛メツキ装置の操業度と生産性
を向上させることができ、斯業に貢献するところは大で
ある。In this case, when conventional Retherloy is used, it takes 3 to 6 months for the snout to develop moth-eaten corrosion.
In the case of 17Cr10Mn2.5Ni steel, no worm-like corrosion occurred and no decrease in wall thickness was observed even after 6 months of use.
In the case of 10Mn2.5NiNb steel, no worm-like corrosion occurred and no decrease in wall thickness occurred even after 8 months of use. As is clear from the above description, 17Cr10Mn2 according to the present invention
．． 5Ni steel and 17Cr whose components are further limited
10Mn2.5NiNb steel was newly invented as a hot melt-resistant semi-ferrous steel, and it can improve the operation rate and productivity of galvanizing equipment, making a great contribution to the industry.
Claims (1)
Ｍｎ８．０〜１２．０重量％、Ｐ０．０４重量％以下、
Ｓ０．０４重量％以下、Ｎｉ２．０〜３．０重量％、Ｃ
ｒ１５．０〜１９．０重量％、Ｎ０．２重量％以下を含
有することを特徴とする耐溶融亜鉛合金鋼。 ２ Ｃ０．３〜０．５重量％、Ｓｉ１．５重量％以下、
Ｍｎ８．０〜１２．０重量％、Ｐ０．０４重量％以下、
Ｓ０．０４重量％以下、Ｎｉ２．０〜３．０重量％、Ｃ
ｒ１５．０〜１９．０重量％、Ｎｂ０．３〜１．０重量
％、Ｎ０．２重量％以下を含有することを特徴とする耐
溶融亜鉛合金鋼。[Claims] 1 C0.3 to 0.5% by weight, Si 1.5% by weight or less,
Mn 8.0 to 12.0% by weight, P 0.04% by weight or less,
S 0.04% by weight or less, Ni 2.0-3.0% by weight, C
A molten-dip resistant zinc alloy steel characterized by containing 15.0 to 19.0% by weight of r and 0.2% by weight or less of N. 2 C0.3 to 0.5% by weight, Si 1.5% by weight or less,
Mn 8.0 to 12.0% by weight, P 0.04% by weight or less,
S 0.04% by weight or less, Ni 2.0-3.0% by weight, C
A molten-dip resistant zinc alloy steel containing 15.0 to 19.0% by weight of r, 0.3 to 1.0% by weight of Nb, and 0.2% by weight or less of N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9566581A JPS5939498B2 (en) | 1981-06-20 | 1981-06-20 | Hot dip resistant zinc alloy steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9566581A JPS5939498B2 (en) | 1981-06-20 | 1981-06-20 | Hot dip resistant zinc alloy steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57210959A JPS57210959A (en) | 1982-12-24 |
| JPS5939498B2 true JPS5939498B2 (en) | 1984-09-25 |
Family
ID=14143784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9566581A Expired JPS5939498B2 (en) | 1981-06-20 | 1981-06-20 | Hot dip resistant zinc alloy steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5939498B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2748843B2 (en) * | 1994-01-07 | 1998-05-13 | 株式会社栗本鐵工所 | High manganese non-magnetic casting |
-
1981
- 1981-06-20 JP JP9566581A patent/JPS5939498B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57210959A (en) | 1982-12-24 |
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