JPH0770682A - Ni-based alloy for tank car - Google Patents
Ni-based alloy for tank carInfo
- Publication number
- JPH0770682A JPH0770682A JP22146393A JP22146393A JPH0770682A JP H0770682 A JPH0770682 A JP H0770682A JP 22146393 A JP22146393 A JP 22146393A JP 22146393 A JP22146393 A JP 22146393A JP H0770682 A JPH0770682 A JP H0770682A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- based alloy
- strong
- weight
- vehicles
- 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.)
- Pending
Links
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、硫酸、硝酸等の強酸、
次亜塩素酸ソーダ、苛性ソーダ等の強アルカリ等の腐食
性液体を運搬するタンクローリー、タンク鉄道車両等の
タンク車両のタンク本体に用いて好適なタンク車両用Ｎ
ｉ基合金に関するものである。The present invention relates to strong acids such as sulfuric acid and nitric acid,
N for tank vehicles suitable for use in tank tanks for tank lorries that carry corrosive liquids such as strong alkalis such as sodium hypochlorite and caustic soda, and tank vehicles such as tank railway vehicles
The present invention relates to an i-based alloy.
【０００２】[0002]
【従来の技術】従来、工場において製造される硫酸、硝
酸等の強酸や次亜塩素酸ソーダ、苛性ソーダ等の強アル
カリは、通常、タンクローリー、タンク鉄道車両等のタ
ンク車両を用いて無機化学工場、石油化学工場、薬品メ
ーカー等の大口消費者に搬入される。このタンク車両に
おいては、タンク本体が貯留される強酸や強アルカリに
より腐食されることのないように、ステンレススチール
製のタンクや、ゴム、テフロン、ＦＲＰ（繊維強化プラ
スチック）等を内面にライニング、またはＴｉをコーテ
ィングした炭素鋼製のタンクが用いられている。2. Description of the Related Art Conventionally, strong acids such as sulfuric acid, nitric acid, etc. and strong alkalis such as sodium hypochlorite, caustic soda, etc., which are conventionally produced in factories, are usually used in inorganic chemical factories using tank vehicles such as tank trucks and tank railroad vehicles. It is delivered to large consumers such as petrochemical plants and drug makers. In this tank vehicle, the stainless steel tank, rubber, Teflon, FRP (fiber reinforced plastic), etc. are lined on the inner surface so that the tank body will not be corroded by the strong acid or strong alkali that is stored, or A Ti-coated carbon steel tank is used.
【０００３】[0003]
【発明が解決しようとする課題】ところで、ステンレス
スチール製のタンクは、硫酸や硝酸に対して粒界腐食の
危険性があり、遠距離輸送等の様に長期間貯留する必要
がある場合には用いることが出来ないという問題点があ
る。また、ゴム、テフロン、ＦＲＰ等を内面にライニン
グした炭素鋼製のタンクは、これらのライニングが洗浄
後にバキュームを掛ける際に剥離したり、強酸や強アル
カリにより侵食されたりして、母材の炭素鋼が腐食され
る危険性があり、メンテナンスが困難であるという問題
点がある。特に、ＦＲＰをライニングしたタンクの場
合、毒劇物取締法の改正により、タンクの新製造が不可
能になるという新たな問題も生じている。また、Ｔｉを
コーティングしたタンクは、塩酸、硫酸に対して腐食さ
れ易く、加工が困難であり、異材溶接が不可能であると
いう欠点がある。By the way, a stainless steel tank has a risk of intergranular corrosion with sulfuric acid and nitric acid, and is required to be stored for a long period of time such as long-distance transportation. There is a problem that it cannot be used. In addition, carbon steel tanks with rubber, Teflon, FRP, etc. lined on the inner surface are peeled off when the lining is vacuumed after cleaning, or are corroded by strong acid or strong alkali, and There is a risk that steel may be corroded and maintenance is difficult. Particularly, in the case of a tank lined with FRP, a new problem that a new manufacturing of the tank becomes impossible due to the amendment of the Poisonous and Deleterious Substances Control Law has occurred. Further, a tank coated with Ti has a drawback that it is easily corroded by hydrochloric acid and sulfuric acid, is difficult to process, and cannot weld different materials.
【０００４】本発明は上記の事情に鑑みてなされたもの
であって、硫酸、硝酸等の強酸、次亜塩素酸ソーダ、苛
性ソーダ等の強アルカリ等の腐食性液体により腐食され
る危険性がなく、しかも、加工及びメンテナンスが容易
であるタンク車両用Ｎｉ基合金を提供することにある。The present invention has been made in view of the above circumstances, and is free from the risk of being corroded by a corrosive liquid such as a strong acid such as sulfuric acid or nitric acid, a strong alkali such as sodium hypochlorite or caustic soda. Moreover, it is an object of the present invention to provide a Ni-based alloy for tank vehicles, which is easy to process and maintain.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明は次の様なタンク車両用Ｎｉ基合金を採用し
た。すなわち、腐食性液体を運搬するタンク車両のタン
ク本体の少なくとも内面に形成され、少なくともＣｒを
２０．０〜２２．５重量％、Ｍｏを１２．５〜１４．５
重量％、Ｗを２．５〜３．５重量％、Ｆｅを２．０〜
６．０重量％、Ｃｏを０．０１〜２．５重量％含有し、
残部がＮｉ及び不可避不純物からなることを特徴として
いる。In order to solve the above problems, the present invention employs the following Ni-based alloy for tank vehicles. That is, it is formed on at least the inner surface of the tank body of a tank vehicle that carries a corrosive liquid, and contains at least 20.0 to 22.5% by weight of Cr and 12.5-14.5% of Mo.
Wt%, W 2.5-3.5 wt%, Fe 2.0-
6.0 wt%, containing 0.01 to 2.5 wt% Co,
The balance is characterized by being composed of Ni and unavoidable impurities.
【０００６】[0006]
【作用】本発明のタンク車両用Ｎｉ基合金では、腐食性
液体を運搬するタンク車両のタンク本体の少なくとも内
面に形成される合金を、少なくともＣｒを２０．０〜２
２．５重量％、Ｍｏを１２．５〜１４．５重量％、Ｗを
２．５〜３．５重量％、Ｆｅを２．０〜６．０重量％、
Ｃｏを０．０１〜２．５重量％含有し、残部がＮｉ及び
不可避不純物からなるＮｉ・Ｃｒ・Ｍｏ系合金とする。In the Ni-based alloy for a tank vehicle of the present invention, the alloy formed on at least the inner surface of the tank body of the tank vehicle that transports the corrosive liquid contains at least Cr 20.0-2.
2.5 wt%, Mo 12.5-14.5 wt%, W 2.5-3.5 wt%, Fe 2.0-6.0 wt%,
A Ni / Cr / Mo alloy containing 0.01 to 2.5% by weight of Co and the balance of Ni and inevitable impurities.
【０００７】前記Ｎｉ・Ｃｒ・Ｍｏ系合金は、腐食性無
機酸である硫酸、硝酸等の強酸や、腐食性無機アルカリ
である次亜塩素酸ソーダ、苛性ソーダ等の強アルカリに
対する耐食性が優れている。そこで、このＮｉ・Ｃｒ・
Ｍｏ系合金を腐食性液体を運搬するタンク車両のタンク
本体の少なくとも内面に形成すれば、この内面は硫酸、
硝酸等の強酸や次亜塩素酸ソーダ、苛性ソーダ等の強ア
ルカリに対して優れた耐食性を有することとなる。した
がって、このタンク本体の内面の硫酸、硝酸等の強酸や
次亜塩素酸ソーダ、苛性ソーダ等の強アルカリに対する
耐食性を向上させることが可能になる。The Ni / Cr / Mo alloys have excellent corrosion resistance to corrosive inorganic acids such as sulfuric acid and nitric acid, and corrosive inorganic alkalis such as sodium hypochlorite and caustic soda. . Therefore, this Ni ・ Cr ・
If the Mo-based alloy is formed on at least the inner surface of the tank body of the tank vehicle that transports the corrosive liquid, the inner surface is
It has excellent corrosion resistance against strong acids such as nitric acid and strong alkalis such as sodium hypochlorite and caustic soda. Therefore, it becomes possible to improve the corrosion resistance of the inner surface of the tank body against strong acids such as sulfuric acid and nitric acid and strong alkalis such as sodium hypochlorite and caustic soda.
【０００８】[0008]
【実施例】以下、本発明の一実施例のタンク車両用Ｎｉ
基合金について図１に基づき説明する。このタンク車両
用Ｎｉ基合金板１は、硫酸、硝酸等の強酸や、次亜塩素
酸ソーダ、苛性ソーダ等の強アルカリを運搬するタンク
車両のタンク本体に適用された厚みｔが４ｍｍのＮｉ・
Ｃｒ・Ｍｏ系合金板であり、少なくともＣｒを２０．０
〜２２．５重量％、Ｍｏを１２．５〜１４．５重量％、
Ｗを２．５〜３．５重量％、Ｆｅを２．０〜６．０重量
％、Ｃｏを０．０１〜２．５重量％含有し、残部がＮｉ
及び不可避不純物からなるものである。このタンク車両
用Ｎｉ基合金板１は、耐食性及び加工性を考慮した場合
の有効な厚みｔは、１〜２０ｍｍである。EXAMPLE An Ni for tank vehicle according to an example of the present invention will be described below.
The base alloy will be described with reference to FIG. This Ni-based alloy plate 1 for a tank vehicle is a Ni-based alloy having a thickness t of 4 mm applied to a tank body of a tank vehicle that carries strong acids such as sulfuric acid and nitric acid and strong alkalis such as sodium hypochlorite and caustic soda.
Cr-Mo alloy plate with at least 20.0% Cr
~ 22.5% by weight, Mo 12.5 to 14.5% by weight,
W: 2.5 to 3.5 wt%, Fe: 2.0 to 6.0 wt%, Co: 0.01 to 2.5 wt%, balance: Ni
And unavoidable impurities. The effective thickness t of the Ni-based alloy sheet 1 for tank vehicles is 1 to 20 mm in consideration of corrosion resistance and workability.
【０００９】このタンク車両用Ｎｉ基合金板１を用いて
タンク本体を作成すれば、このタンク本体は硫酸、硝酸
等の強酸や次亜塩素酸ソーダ、苛性ソーダ等の強アルカ
リに対して優れた耐食性を有することとなる。したがっ
て、このタンク本体の硫酸、硝酸等の強酸や次亜塩素酸
ソーダ、苛性ソーダ等の強アルカリに対する耐食性をそ
れぞれ向上させることが可能になる。If a tank body is made using this Ni-based alloy plate 1 for tank vehicles, this tank body has excellent corrosion resistance against strong acids such as sulfuric acid and nitric acid and strong alkalis such as sodium hypochlorite and caustic soda. Will have. Therefore, it becomes possible to improve the corrosion resistance of the tank body against strong acids such as sulfuric acid and nitric acid and strong alkalis such as sodium hypochlorite and caustic soda.
【００１０】表１は、本実施例のタンク車両用Ｎｉ基合
金板（Ｎｏ．１〜７）各々の組成と、本発明の組成の範
囲から外れたタンク車両用Ｎｉ基合金板（比較例）（Ｎ
ｏ．１１〜１７）各々の組成とを、重量百分率で表わし
たものである。Table 1 shows the composition of each of the Ni-based alloy plates for tank vehicles (Nos. 1 to 7) of this embodiment and the Ni-based alloy plates for tank vehicles outside the composition range of the present invention (comparative example). (N
o. 11 to 17) Each composition is expressed as a weight percentage.
【表１】 [Table 1]
【００１１】また、表２は、上記実施例及び比較例の各
々のタンク車両用Ｎｉ基合金板について、９０％及び９
８％の硫酸（濃硫酸）、７０％の硝酸（濃硝酸）、１２
％の次亜塩素酸ソーダ（ＮａＣｌＯ）水溶液、５０％の
苛性ソーダ水溶液各々に対する耐食性を調べた結果を示
したものである。Further, Table 2 shows 90% and 9% for the Ni-based alloy plates for tank vehicles of each of the above-mentioned Examples and Comparative Examples.
8% sulfuric acid (concentrated sulfuric acid), 70% nitric acid (concentrated nitric acid), 12
2 shows the results of examining the corrosion resistance for each of a 50% sodium hypochlorite (NaClO) aqueous solution and a 50% caustic soda aqueous solution.
【表２】 [Table 2]
【００１２】試験方法は、上記の各タンク車両用Ｎｉ基
合金板を４０℃の温度の各試験溶液に浸漬し、１０００
時間放置した後、これらの各合金板の腐食速度／年を測
定し、腐食速度の最大値が０．０５ｍｍ／年以下のもの
を「Ａ」、０．０５ｍｍ／年以上、かつ、０．２０ｍｍ
／年以下のものを「Ｂ」、０．２０ｍｍ／年以上、か
つ、１．２７ｍｍ／年以下のものを「Ｃ」、１．２７ｍ
ｍ／年以上のものを「Ｄ」と評価した。The test method is as follows: the above Ni-based alloy plate for tank vehicles is immersed in each test solution at a temperature of 40 ° C.
After standing for a period of time, the corrosion rate / year of each of these alloy plates is measured, and the maximum corrosion rate of 0.05 mm / year or less is “A”, 0.05 mm / year or more, and 0.20 mm.
"B" for less than 1 year / year, "C" for more than 0.20mm / year and less than 1.27mm / year, 1.27m
Those having m / year or more were evaluated as "D".
【００１３】表２から明かなように、本実施例のタンク
車両用Ｎｉ基合金板（Ｎｏ．１〜７）の評価は全て
「Ａ」であり、比較例のタンク車両用Ｎｉ基合金板（Ｎ
ｏ．１１〜１７）の評価が「Ｃ」であるのと比べて、全
ての溶液に対する耐食性が大幅に向上していることがわ
かる。また、本実施例のタンク車両用Ｎｉ基合金板（Ｎ
ｏ．１〜７）の各断面を金属顕微鏡により観察したとこ
ろ、極表面層を除いては全く腐食しておらず、耐食性が
良好であることが確認された。一方、比較例のタンク車
両用Ｎｉ基合金板（Ｎｏ．１１〜１７）は、表面層が溶
液により腐食されており耐食性に欠けることが明かとな
った。As is clear from Table 2, all the Ni-based alloy plates for tank vehicles (Nos. 1 to 7) of this example were evaluated as "A", and the Ni-based alloy plates for tank vehicles of the comparative example ( N
o. It can be seen that the corrosion resistance to all solutions is significantly improved as compared with the case where the evaluation of 11 to 17) is “C”. In addition, the Ni-based alloy plate (N
o. When each cross section of 1 to 7) was observed with a metallurgical microscope, it was confirmed that it was not corroded at all except for the extreme surface layer, and the corrosion resistance was good. On the other hand, it was revealed that the surface layers of the Ni-based alloy plates for tank vehicles (Nos. 11 to 17) of the comparative example were corroded by the solution and lacked in corrosion resistance.
【００１４】また、表３は、上記実施例及び比較例の各
々のタンク車両用Ｎｉ基合金板について、耐隙間腐食性
を調べた結果を示したものである。Further, Table 3 shows the results of examining the crevice corrosion resistance of the Ni-based alloy plates for tank vehicles of each of the above-mentioned Examples and Comparative Examples.
【表３】 [Table 3]
【００１５】試験方法は、上記の各タンク車両用Ｎｉ基
合金板各々について、２枚重ね合わせた試験片をそれぞ
れ２組（ＡとＢ）づつ用意し、これらの各試験片を試験
液に浸漬させ、この試験液を５℃ずつ上昇させていき、
隙間腐食が発生する最も低い温度を求めた。試験液は、
４％ＮａＣｌ水溶液、０．１％Ｆｅ2（ＳＯ4）3水溶
液、０．０１ｍｏｌ／ｌのＨＣｌ各々を、液中のＣｌ-
濃度が２４３００ｐｐｍ、ｐＨが２となるように混合し
た。なお、各温度での浸漬時間は１００時間である。The test method was to prepare two sets of test pieces (A and B), each of which was made by stacking two sheets on each of the above-mentioned Ni-based alloy plates for tank vehicles, and dipped each of these test pieces in a test solution. And increase the test solution by 5 ° C,
The lowest temperature at which crevice corrosion occurs was determined. The test solution is
4% NaCl aqueous solution, 0.1% Fe 2 (SO 4 ) 3 aqueous solution, and 0.01 mol / l HCl were respectively added to the Cl − in the solution.
The mixture was mixed so that the concentration was 24300 ppm and the pH was 2. The immersion time at each temperature is 100 hours.
【００１６】表３から明かなように、本実施例のタンク
車両用Ｎｉ基合金板（Ｎｏ．１〜７）は全てが１０２℃
以上であり、比較例のタンク車両用Ｎｉ基合金板（Ｎ
ｏ．１１〜１７）の８２℃以下と比べて、耐隙間腐食性
が大幅に向上していることがわかる。As is apparent from Table 3, all of the Ni-based alloy plates for tank vehicles (Nos. 1 to 7) of this embodiment have a temperature of 102.degree.
The above is the Ni-based alloy plate for a tank vehicle (N
o. It can be seen that the crevice corrosion resistance is significantly improved compared to 82 ° C. or less of 11 to 17).
【００１７】以上説明した様に、上記一実施例のタンク
車両用Ｎｉ基合金板１によれば、硫酸、硝酸等の強酸
や、次亜塩素酸ソーダ、苛性ソーダ等の強アルカリを運
搬するタンク車両のタンク本体に適用され、少なくとも
Ｃｒを２０．０〜２２．５重量％、Ｍｏを１２．５〜１
４．５重量％、Ｗを２．５〜３．５重量％、Ｆｅを２．
０〜６．０重量％、Ｃｏを０．０１〜２．５重量％含有
し、残部がＮｉ及び不可避不純物からなるＮｉ・Ｃｒ・
Ｍｏ系合金としたので、硫酸、硝酸等の強酸や次亜塩素
酸ソーダ、苛性ソーダ等の強アルカリに対する耐食性を
向上させることができる。したがって、遠距離輸送等の
様に長期間貯留する必要がある場合においても何等問題
が生じない。また、異材溶接が可能であるから、加工及
びメンテナンスが容易であるという優れた効果を奏する
ことができる。As described above, according to the Ni-based alloy plate 1 for a tank vehicle of the above-described embodiment, the tank vehicle that carries a strong acid such as sulfuric acid or nitric acid or a strong alkali such as sodium hypochlorite or caustic soda. Applied to the tank body of, at least 20.0 to 22.5% by weight of Cr and 12.5-1 to 1% of Mo.
4.5 wt%, W 2.5 to 3.5 wt%, Fe 2.
Ni-Cr-containing 0-6.0% by weight, 0.01-2.5% by weight of Co, and the balance Ni and unavoidable impurities
Since it is a Mo-based alloy, it is possible to improve the corrosion resistance to strong acids such as sulfuric acid and nitric acid and strong alkalis such as sodium hypochlorite and caustic soda. Therefore, no problems occur even when long-term storage such as long-distance transportation is required. Moreover, since dissimilar materials can be welded, it is possible to obtain an excellent effect that processing and maintenance are easy.
【００１８】また、この実施例では形状を板状とした
が、この形状は板状に限定されることなく例えば、管
状、円筒状等、装置の形状によって適宜変更可能であ
る。また、この実施例のタンク車両用Ｎｉ基合金は、上
記一実施例のタンク車両用Ｎｉ基合金板１に限定される
ことなく様々な形態で使用することが可能である。例え
ば、炭素鋼等を用いたタンク本体の内面に該タンク車両
用Ｎｉ基合金をライニングしたり、クラッド鋼として用
いてもよい。In this embodiment, the shape is plate-like, but the shape is not limited to plate-like, and can be appropriately changed depending on the shape of the device, such as tubular or cylindrical. Further, the Ni-based alloy for a tank vehicle of this embodiment is not limited to the Ni-based alloy plate 1 for a tank vehicle of the above-described embodiment, and can be used in various forms. For example, the inner surface of the tank body made of carbon steel or the like may be lined with the Ni-based alloy for tank vehicle, or may be used as clad steel.
【００１９】[0019]
【発明の効果】以上説明した様に、本発明のタンク車両
用Ｎｉ基合金によれば、腐食性液体を運搬するタンク車
のタンク本体の少なくとも内面に形成され、少なくとも
Ｃｒを２０．０〜２２．５重量％、Ｍｏを１２．５〜１
４．５重量％、Ｗを２．５〜３．５重量％、Ｆｅを２．
０〜６．０重量％、Ｃｏを０．０１〜２．５重量％含有
し、残部がＮｉ及び不可避不純物からなることとしたの
で、硫酸、硝酸等の強酸や次亜塩素酸ソーダ、苛性ソー
ダ等の強アルカリに対する耐食性を向上させることがで
きる。したがって、遠距離輸送等の様に長期間貯留する
必要がある場合においても何等問題が生じない。また、
異材溶接が可能であるから、加工及びメンテナンスが容
易であるという優れた効果を奏することができる。As described above, according to the Ni-based alloy for a tank vehicle of the present invention, it is formed on at least the inner surface of the tank body of the tank vehicle that carries the corrosive liquid and contains at least Cr of 20.0 to 22. 0.5 wt%, Mo 12.5-1
4.5 wt%, W 2.5 to 3.5 wt%, Fe 2.
0 to 6.0% by weight, 0.01 to 2.5% by weight of Co, and the balance of Ni and unavoidable impurities, so strong acids such as sulfuric acid and nitric acid, sodium hypochlorite, caustic soda, etc. It is possible to improve the corrosion resistance to strong alkali. Therefore, no problems occur even when long-term storage such as long-distance transportation is required. Also,
Since dissimilar materials can be welded, an excellent effect that processing and maintenance are easy can be achieved.
【図１】本発明のタンク車両用Ｎｉ基合金板を示す側面
図である。FIG. 1 is a side view showing a Ni-based alloy plate for a tank vehicle of the present invention.
１ タンク車両用Ｎｉ基合金板 1 Ni-based alloy plate for tank vehicles
Claims (1)
ク本体の少なくとも内面に形成され、 少なくともＣｒを２０．０〜２２．５重量％、Ｍｏを１
２．５〜１４．５重量％、Ｗを２．５〜３．５重量％、
Ｆｅを２．０〜６．０重量％、Ｃｏを０．０１〜２．５
重量％含有し、残部がＮｉ及び不可避不純物からなるこ
とを特徴とするタンク車両用Ｎｉ基合金。1. A tank body of a tank vehicle for transporting a corrosive liquid, which is formed on at least an inner surface of a tank body and contains at least 20.0 to 22.5% by weight of Cr and 1% of Mo.
2.5 to 14.5% by weight, W to 2.5 to 3.5% by weight,
2.0 to 6.0% by weight of Fe and 0.01 to 2.5 of Co
A Ni-based alloy for tank vehicles, characterized in that it is contained in a weight percentage and the balance comprises Ni and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22146393A JPH0770682A (en) | 1993-09-06 | 1993-09-06 | Ni-based alloy for tank car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22146393A JPH0770682A (en) | 1993-09-06 | 1993-09-06 | Ni-based alloy for tank car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0770682A true JPH0770682A (en) | 1995-03-14 |
Family
ID=16767117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22146393A Pending JPH0770682A (en) | 1993-09-06 | 1993-09-06 | Ni-based alloy for tank car |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0770682A (en) |
-
1993
- 1993-09-06 JP JP22146393A patent/JPH0770682A/en active Pending
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