JPH0533121A - Production of austenitic stainless steel sheet strip having nial intermetallic compound in surface layer - Google Patents
Production of austenitic stainless steel sheet strip having nial intermetallic compound in surface layerInfo
- Publication number
- JPH0533121A JPH0533121A JP9834391A JP9834391A JPH0533121A JP H0533121 A JPH0533121 A JP H0533121A JP 9834391 A JP9834391 A JP 9834391A JP 9834391 A JP9834391 A JP 9834391A JP H0533121 A JPH0533121 A JP H0533121A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- austenitic stainless
- coating
- intermetallic compound
- nial intermetallic
- 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.)
- Granted
Links
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- Pressure Welding/Diffusion-Bonding (AREA)
- Laminated Bodies (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オーステナイトステン
レス鋼板帯表面に耐高温腐食性に優れたＮｉＡｌ金属間
化合物を製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a NiAl intermetallic compound excellent in high temperature corrosion resistance on the surface of an austenitic stainless steel strip.
【０００２】[0002]
【従来の技術】従来よりオーステナイトステンレス鋼の
高温耐食性を向上させる方法として、Ａｌを浸透拡散さ
せて、オーステナイトステンレス鋼に含有されているＮ
ｉと反応させ、その表面にＮｉＡｌ金属間化合物を形成
させることはパックコーテング法として知られている。
例えば、２５％Ａｌ−１．５％ＮＨ４Ｃｌ−７３．５％
Ａｌ２Ｏ３よりなるバック剤を用い、試料をこのパック
剤中に７５０℃で４時間パック処理し、その後１７５０
℃で４時間拡散処理を行って、試料表面にＮｉＡｌ金属
間化合物よりなる拡散層を形成していた。2. Description of the Related Art Conventionally, as a method for improving high temperature corrosion resistance of austenitic stainless steel, N is contained in austenitic stainless steel by permeating and diffusing Al.
It is known as a pack coating method to react with i to form a NiAl intermetallic compound on the surface thereof.
For example, 25% Al-1.5% NH 4 Cl-73.5%
Samples were packed in this pack at 750 ° C. for 4 hours using a backing agent consisting of Al 2 O 3 and then 1750.
Diffusion treatment was performed at 4 ° C. for 4 hours to form a diffusion layer of NiAl intermetallic compound on the sample surface.
【０００３】しかし、この方法はパック剤が必要である
のみならず板帯には適せず、またパック処理に４時間、
拡散処理に４時間と長時間を要していた。However, this method not only requires a packing agent but is not suitable for strips, and the packing process requires 4 hours.
The diffusion process required a long time of 4 hours.
【０００４】[0004]
【発明が解決しようとする課題】本発明者は従来のパッ
クコーテング方法の欠点を改良するため種々検討した結
果、本発明を完成したもので、本発明の目的はパック剤
を使用することなく短時間でオーステナイトステンレス
鋼表面にＮｉＡｌ金属間化合物を形成する方法を提供す
るにある。The present inventor has completed various aspects of the present invention as a result of various studies to improve the drawbacks of the conventional pack coating method, and the present invention has been completed. It is to provide a method of forming a NiAl intermetallic compound on the surface of an austenitic stainless steel in time.
【０００５】[0005]
【課題を解決するための手段】本発明の要旨は、オース
テナイトステンレス鋼板帯表面にＡｌを被覆した７００
〜８００℃の温度範囲内で Ｔ≧ｔ／５ 但しＴ；熱処理時間（時間） ｔ；Ａｌ被覆厚さ（μｍ） を満足する条件で非酸化性雰囲気で拡散処理することを
特徴とする、表面にＮｉＡｌ金属間化合物を有するオー
ステナイトステンレス鋼板帯の製造方法である。SUMMARY OF THE INVENTION The gist of the present invention is 700 in which the austenitic stainless steel strip surface is coated with Al.
Within a temperature range of ˜800 ° C. T ≧ t / 5 where T: heat treatment time (hours) t: a surface characterized by diffusion treatment in a non-oxidizing atmosphere under conditions satisfying an Al coating thickness (μm) It is a method for producing an austenitic stainless steel strip having a NiAl intermetallic compound.
【０００６】すなわち、本発明はパック剤を使用する代
わりに、第１工程としてオーステナイトステンレス鋼板
帯表面にＡｌ被覆層を形成し、続いて第２工程として該
被覆層のＡｌを非酸化性雰囲気中で拡散させ、オーステ
ナイトステンレス鋼中に含有されているＮｉと反応させ
てＮｉＡｌ金属間化合物を形成させる。That is, in the present invention, instead of using a packing agent, an Al coating layer is formed on the surface of an austenitic stainless steel strip as a first step, and then, as a second step, Al of the coating layer is added in a non-oxidizing atmosphere. And is reacted with Ni contained in austenitic stainless steel to form a NiAl intermetallic compound.
【０００７】本発明において、オーステナイトステンレ
ス鋼板帯表面にＡｌ被覆を設ける手段は特に限定される
ものではなく、溶融メッキ法、クラッド法或はメカニカ
ルプレーティング方法等何れの方法でもよく、被覆する
膜厚によって被覆手段を採択することが可能である。薄
い被覆層の場合にはメカニカルプレーティング方法が好
ましい。メカニカルプレーティング法とは、Ａｌ又はＡ
ｌ合金よりなる金属ブロックにワイヤーブラシを接触さ
せて、Ａｌ又はＡｌ合金の微小金属片を剥ぎ取り、これ
をオーステナイトステンレス鋼板帯表面に被覆するので
ある。したがって、このメカニカルプレーテング方法を
採用することによって、Ａｌ被覆層の厚さを薄くできる
ばかりでなく、その層の厚さをコントロールし、所望の
厚さのものを容易に得ることができる。In the present invention, the means for providing the Al coating on the surface of the austenitic stainless steel strip is not particularly limited, and any method such as a hot dip coating method, a clad method or a mechanical plating method may be used. It is possible to adopt a covering means by means of. For thin coating layers, mechanical plating methods are preferred. Mechanical plating method is Al or A
A wire brush is brought into contact with a metal block made of 1-alloy to peel off a fine metal piece of Al or an Al alloy, and this is coated on the surface of the austenitic stainless steel strip. Therefore, by adopting this mechanical plating method, not only the thickness of the Al coating layer can be reduced, but also the thickness of the layer can be controlled to easily obtain a desired thickness.
【０００８】次に、Ａｌ被覆層を形成後、Ａｌをオース
テナイトステンレス鋼板に拡散させてＮｉＡｌ金属間化
合物を形成する。その際の温度は７００℃ないし８００
℃の温度範囲内の温度で行う。７００℃以下では拡散速
度が遅く、ＮｉＡｌ金属間化合物が生成しにくい。また
８００℃以上では、Ａｌ拡散が進みすぎてＡｌＮｉの他
にフェライト相が生成する。Next, after forming an Al coating layer, Al is diffused into an austenitic stainless steel plate to form a NiAl intermetallic compound. The temperature at that time is 700 ℃ to 800 ℃
Perform at a temperature within the temperature range of ° C. At 700 ° C. or lower, the diffusion rate is slow and it is difficult for NiAl intermetallic compounds to form. At 800 ° C. or higher, Al diffusion proceeds too much and a ferrite phase is generated in addition to AlNi.
【０００９】また時間はＡｌ被覆厚さをｔμｍとしたと
き Ｔ≧ｔ／５ （Ｔ；時間） の関係を満足するような時間であり、 Ｔ＜ｔ／５ の場合にはＡｌの拡散が不十分でＮｉＡｌが生成しな
い。通常Ａｌ被覆層の厚さとしては数μｍより数１０μ
ｍであるので、拡散時間としては１時間〜１０数時間で
ある。Further, the time is a time that satisfies the relationship of T ≧ t / 5 (T; time) when the Al coating thickness is t μm, and when T <t / 5, the diffusion of Al does not occur. Sufficient NiAl is not formed. Usually, the thickness of the Al coating layer is from several μm to several tens μ
Since it is m, the diffusion time is 1 to 10 hours.
【００１０】[0010]
実施例１ 素材として板厚０．１ｍｍのオーステナイトステンレス
綱ＳＵＳ３０４を使用し、冷間クラッド法によりその表
面に厚さ５０μｍのＡｌ被覆層を設けた。次いで、これ
を７００℃で約１２時間過熱させてＡｌを拡散させ、得
られたステンレス鋼をＸ線回折により調べたところＮｉ
Ａｌが形成されており、またフェライト相の形成はみら
れなかった。 実施例２〜５，比較例１〜３Example 1 Austenitic stainless steel SUS304 having a plate thickness of 0.1 mm was used as a material, and an Al coating layer having a thickness of 50 μm was provided on the surface thereof by a cold clad method. Then, this was heated at 700 ° C. for about 12 hours to diffuse Al, and the obtained stainless steel was examined by X-ray diffraction.
Al was formed, and no ferrite phase was formed. Examples 2-5, Comparative Examples 1-3
【００１１】表１に示す板厚０．１ｍｍの素材を用い表
１に記載した方法によってＡｌ被覆層を設け、続いて拡
散を行った。得られたステンレス鋼表面をＸ線回折によ
ってＮｉＡｌの有無を調べたところ、表１の通りとなっ
た。An Al coating layer was formed by the method described in Table 1 using the materials having a plate thickness of 0.1 mm shown in Table 1, and then diffusion was performed. The surface of the obtained stainless steel was examined by X-ray diffraction for the presence or absence of NiAl.
【００１２】また比較例として、拡散温度が７００℃以
下の場合（比較例３）、８００℃以上の場合（比較例
２）及び拡散時間がｔ／５より短時間の場合（比較例
１）をそれぞれ表１に示した。Further, as comparative examples, the case where the diffusion temperature is 700 ° C. or lower (Comparative example 3), the case where the diffusion temperature is 800 ° C. or higher (Comparative example 2) and the diffusion time is shorter than t / 5 (Comparative example 1). Each is shown in Table 1.
【００１３】[0013]
【表１】 次に、実施例４及び比較例２について高温腐食性を調べ
た。試験方法として、試料を０．５％食塩水中に１分間
浸透後乾燥し、これを７００℃で６０分間加熱した場合
を１サイクルとして、２０サイクル迄行ったとき、各サ
イクルごとに酸化増量を測定した。その結果を図１に示
す。[Table 1] Next, the high temperature corrosivity of Example 4 and Comparative Example 2 was examined. As a test method, the sample was soaked in 0.5% saline solution for 1 minute and then dried, and the sample was heated at 700 ° C. for 60 minutes as one cycle. When the cycle was repeated up to 20 cycles, the amount of increased oxidation was measured for each cycle. did. The result is shown in FIG.
【００１４】この結果より明らかなように、本発明にか
かる方法で得られたものは殆ど重量変化はなかった。As is clear from this result, the weight of the product obtained by the method according to the present invention hardly changed.
【００１５】[0015]
【効果】以上述べたように、本発明方法は、従来方法に
比べて極めて簡単にオーステナイトステンレス鋼板帯の
表面に、ＮｉＡｌ金属間化合物を形成することができ、
これによって、オーステナイトステンレス鋼板帯の高温
耐食性が増加される。As described above, the method of the present invention can form the NiAl intermetallic compound on the surface of the austenitic stainless steel strip very easily as compared with the conventional method.
This increases the high temperature corrosion resistance of the austenitic stainless steel strip.
【００１６】[0016]
図１は、本願の方法によって得られた金属表面の高温耐
食性試験の結果を図示したものである。FIG. 1 illustrates the results of a high temperature corrosion resistance test of a metal surface obtained by the method of the present application.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｃ２１Ｄ 6/00 １０２ Ａ 9269−4Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location // C21D 6/00 102 A 9269-4K
Claims (1)
を被覆した後、７００〜８００℃の温度範囲内で Ｔ≧ｔ／５ 但しＴ；熱処理時間（時間） ｔ；Ａｌ被覆厚さ（μｍ） を満足する条件で非酸化性雰囲気で拡散熱処理すること
を特徴とする表層にＮｉＡｌ金属間化合物を有するオー
ステナイトステンレス鋼板帯の製造方法。What is claimed is: 1. Austenitic stainless steel strip surface has Al
After the coating, T ≧ t / 5 within the temperature range of 700 to 800 ° C., where T is the heat treatment time (hours) t is the diffusion heat treatment in a non-oxidizing atmosphere under the condition that the Al coating thickness (μm) is satisfied. A method for producing an austenitic stainless steel strip having a NiAl intermetallic compound on its surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3098343A JP2943021B2 (en) | 1991-01-31 | 1991-01-31 | Method for producing austenitic steel sheet strip having NiAl intermetallic compound in surface layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3098343A JP2943021B2 (en) | 1991-01-31 | 1991-01-31 | Method for producing austenitic steel sheet strip having NiAl intermetallic compound in surface layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0533121A true JPH0533121A (en) | 1993-02-09 |
| JP2943021B2 JP2943021B2 (en) | 1999-08-30 |
Family
ID=14217264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3098343A Expired - Lifetime JP2943021B2 (en) | 1991-01-31 | 1991-01-31 | Method for producing austenitic steel sheet strip having NiAl intermetallic compound in surface layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2943021B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005064031A1 (en) * | 2003-12-30 | 2005-07-14 | Sandvik Intellectual Property Ab | Method for the manufacture of an austenitic product as well as the use thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117043383A (en) | 2021-04-05 | 2023-11-10 | 日本制铁株式会社 | Hot-stamped molded article |
-
1991
- 1991-01-31 JP JP3098343A patent/JP2943021B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005064031A1 (en) * | 2003-12-30 | 2005-07-14 | Sandvik Intellectual Property Ab | Method for the manufacture of an austenitic product as well as the use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2943021B2 (en) | 1999-08-30 |
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