JPH0441166Y2 - - Google Patents
Info
- Publication number
- JPH0441166Y2 JPH0441166Y2 JP11797388U JP11797388U JPH0441166Y2 JP H0441166 Y2 JPH0441166 Y2 JP H0441166Y2 JP 11797388 U JP11797388 U JP 11797388U JP 11797388 U JP11797388 U JP 11797388U JP H0441166 Y2 JPH0441166 Y2 JP H0441166Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- molten salt
- molten
- steel plate
- salt heat
- 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
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 150000003839 salts Chemical class 0.000 claims description 13
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 6
- 229910000680 Aluminized steel Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
［産業上の利用分野］
本考案は溶融塩熱処理槽に関するものである。
［従来の技術］
溶融塩熱処理槽、例えば被熱処理鋼材を硝酸塩
系溶融塩に浸漬させて600℃以下の温度で熱処理
を行う溶融塩熱処理槽は、従来ステンレス鋼、
Fe合金、Ni合金で構成されていた（「防食技術」
Vol29，No.４，P185〜195）。
［考案が解決しようとする課題］
しかし、前記ステンレス鋼，Fe合金およびNi
合金は、熱処理品の溶融塩への浸漬熱処理後の洗
浄水により塩素イオンの濃縮と水分を含むことに
より、応力腐食割れや腐食がきわめて起りやすい
状態となる。またステンレス鋼等の合金等は大型
の熱処理槽では、材料コストが軟鋼の６倍もかか
り、更に熱膨張率が大きいことから膨張代を大き
く取るなど設計上の留意点が多く高価なものとな
つていた。
［課題を解決するための手段］
本考案は前記従来技術の問題点を有利に解決す
るためになされたものであつて、溶融アルミメツ
キ鋼板で形成された槽の溶接部にニツケル被覆層
を設けたことを特徴とする溶融塩熱処理槽を要旨
とするものである。
以下図面に基づいて本考案を説明する。
第１図は本考案に係る溶融塩熱処理槽の溶接部
を例示する断面図、第２図は溶融塩熱処理槽を示
す斜視図である。
本考案は第１図及び第２図に示すように、溶融
アルミメツキ層２を有する鋼板１を溶接して溶融
塩熱処理槽５を形成し、該槽５の溶融部６にニツ
ケル被覆層４を設けたものである。図中３は普通
鋼溶加材である。
［実施例］
厚さ22mmのボイラー用鋼板）SB−46M）に溶
融アルミメツキを施して表層に0.1〜0.2mmのアル
ミメツキ層を設けた鋼板を溶接して、長さ12.9
ｍ、幅2.1ｍ、高さ1.25ｍの槽を形成し、溶接部
にはニツケル溶接棒を用いて厚さ２〜３mmのニツ
ケル被覆層を設けた。このニツケル被覆層は加工
時のアルミメツキ剥離部の保護の点から両端を５
mm以上母材側へラツプさせた。鋼板及び溶接棒の
組成を表１に示し、表２に従来技術と本考案のコ
ストの比較を示す。
[Industrial Application Field] The present invention relates to a molten salt heat treatment tank. [Prior Art] Molten salt heat treatment tanks, for example, molten salt heat treatment tanks in which steel materials to be heat treated are immersed in nitrate-based molten salt and heat treated at a temperature of 600°C or less, have conventionally been used for stainless steel,
It was composed of Fe alloy and Ni alloy ("corrosion prevention technology")
Vol29, No.4, P185-195). [Problem to be solved by the invention] However, the stainless steel, Fe alloy and Ni
The alloy becomes highly susceptible to stress corrosion cracking and corrosion due to concentration of chlorine ions and water content in the wash water after the heat treatment by immersing the heat-treated product in molten salt. In addition, alloys such as stainless steel require six times as much material cost as mild steel in large heat treatment tanks, and their high coefficient of thermal expansion requires a large expansion allowance, making them expensive. was. [Means for Solving the Problems] The present invention has been made to advantageously solve the problems of the prior art described above, and includes providing a nickel coating layer on the welded portion of a tank formed of a molten aluminized steel plate. The gist is a molten salt heat treatment tank characterized by the following. The present invention will be explained below based on the drawings. FIG. 1 is a sectional view illustrating a welded portion of a molten salt heat treatment tank according to the present invention, and FIG. 2 is a perspective view showing the molten salt heat treatment tank. As shown in FIGS. 1 and 2, the present invention involves welding a steel plate 1 having a molten aluminized layer 2 to form a molten salt heat treatment tank 5, and providing a nickel coating layer 4 on a molten part 6 of the tank 5. It is something that 3 in the figure is ordinary steel filler metal. [Example] Welded a 22 mm thick boiler steel plate (SB-46M) with a 0.1 to 0.2 mm aluminized layer on the surface by applying molten aluminization to a steel plate with a length of 12.9 mm.
A tank with a width of 2.1 m and a height of 1.25 m was formed, and a nickel coating layer with a thickness of 2 to 3 mm was provided at the welded portion using a nickel welding rod. This nickel coating layer was applied at both ends to protect the peeled part of the aluminum plating during processing.
Wraps more than mm towards the base metal side. Table 1 shows the compositions of the steel plate and welding rod, and Table 2 shows a cost comparison between the conventional technology and the present invention.
【表】【table】
【表】
表２に示すように、本考案はボイラー用鋼板、
ステンレス鋼板を使用したものと比較して、ライ
フサイクルコストが低く、総合コストでは1/4以
下ときわめて良好な値を示した。
［考案の効果］
本考案は槽寿命が長く、特に応力腐食割れによ
る槽破壊の危険がなくなり、長期にわたり安定し
た操業を行うことが可能となつた。[Table] As shown in Table 2, the present invention is a boiler steel plate,
Compared to those using stainless steel plates, the life cycle cost is lower, and the total cost is less than 1/4, which is an extremely good value. [Effects of the invention] The present invention has a long tank life, and in particular eliminates the risk of tank destruction due to stress corrosion cracking, making it possible to operate stably over a long period of time.
第１図は本考案に係る溶融塩熱処理槽の溶接部
を例示する断面図、第２図は溶融塩熱処理槽を示
す斜視図である。
１……鋼板、２……溶融アルミメツキ層、３…
…普通鋼溶加材、４……ニツケル被覆層、５……
溶融塩熱処理槽、６……溶接部。
FIG. 1 is a sectional view illustrating a welded portion of a molten salt heat treatment tank according to the present invention, and FIG. 2 is a perspective view showing the molten salt heat treatment tank. 1... Steel plate, 2... Molten aluminized layer, 3...
... Ordinary steel filler metal, 4 ... Nickel coating layer, 5 ...
Molten salt heat treatment tank, 6... welding part.
Claims (1)
にニツケル被覆層を設けたことを特徴とする溶融
塩熱処理槽。 A molten salt heat treatment tank characterized in that a nickel coating layer is provided on the welded part of the tank formed of a molten aluminized steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11797388U JPH0441166Y2 (en) | 1988-09-09 | 1988-09-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11797388U JPH0441166Y2 (en) | 1988-09-09 | 1988-09-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0242057U JPH0242057U (en) | 1990-03-23 |
| JPH0441166Y2 true JPH0441166Y2 (en) | 1992-09-28 |
Family
ID=31361915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11797388U Expired JPH0441166Y2 (en) | 1988-09-09 | 1988-09-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441166Y2 (en) |
-
1988
- 1988-09-09 JP JP11797388U patent/JPH0441166Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0242057U (en) | 1990-03-23 |
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