JP2806145B2 - Austenitic stainless steel with excellent nitric acid corrosion resistance - Google Patents
Austenitic stainless steel with excellent nitric acid corrosion resistanceInfo
- Publication number
- JP2806145B2 JP2806145B2 JP4116678A JP11667892A JP2806145B2 JP 2806145 B2 JP2806145 B2 JP 2806145B2 JP 4116678 A JP4116678 A JP 4116678A JP 11667892 A JP11667892 A JP 11667892A JP 2806145 B2 JP2806145 B2 JP 2806145B2
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- Prior art keywords
- nitric acid
- corrosion resistance
- stainless steel
- concentration
- corrosion
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Description
【０００１】[0001]
【産業上の利用分野】本発明は耐硝酸腐食特性に優れた
オーステナイトステンレス鋼に係り、硝酸製造プラント
のクーラーコンデンサー部、例えば伝熱管や管板、硝酸
と水の気体および液体とが共存する部その他これに準ず
るような条件下において使用するに適した耐食材料に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an austenitic stainless steel having excellent nitric acid corrosion resistance, and relates to a cooler condenser portion of a nitric acid production plant, for example, a heat transfer tube or a tube plate, a portion where nitric acid and water gas and liquid coexist. The present invention also relates to a corrosion-resistant material suitable for use under similar conditions.
【０００２】[0002]
【従来の技術】硫酸製造に関して現今主流をなしている
高圧法、中−高圧法の硝酸製造プロセスでは窒素酸化物
の吸収を８００〜１３００kPa の圧力下で行なうのが特
徴であり、高圧酸化・高圧吸収法とも呼ばれている。ク
ーラーコンデンサーでは、NOやNO2 、N2、O2、H2O が混
合したガスが約２００℃で入り、約５０℃まで冷却され
ると同時に約５０％の硝酸を生成する。この時、ガス中
のH2O が凝縮して、硝酸の生成を始める温度は約１２０
℃で、その時の硝酸濃度は約５０％と予想されている。2. Description of the Related Art The nitric acid production process of the high-pressure method and the medium-high-pressure method, which are currently the mainstream in the production of sulfuric acid, is characterized in that nitrogen oxide is absorbed under a pressure of 800 to 1300 kPa. Also called absorption method. In the cooler condenser, a mixed gas of NO, NO 2 , N 2 , O 2 , and H 2 O enters at about 200 ° C. and is cooled to about 50 ° C., and at the same time, produces about 50% nitric acid. At this time, the temperature at which H 2 O in the gas condenses and the generation of nitric acid starts is about 120 ° C.
At ° C, the nitric acid concentration at that time is expected to be about 50%.
【０００３】前記のように濃度が約５０％の硝酸中でス
テンレス鋼は金属表面に安定な不働態被膜を形成するた
め、極めて優れた耐食性を示す。そのためSUS304L クラ
スのステンレス鋼が上記のような設備において多く採用
されている。[0003] As described above, stainless steel in nitric acid having a concentration of about 50% forms a stable passive film on the metal surface, and thus exhibits extremely excellent corrosion resistance. Therefore, SUS304L class stainless steel is widely used in such facilities.
【０００４】[0004]
【発明が解決しようとする課題】クーラーコンデンサー
にSUS304L を用いたところ激しい腐食が生じることがあ
る。即ち高濃度の硝酸中でSUS304L クラスのステンレス
鋼は激しく腐食するため、クーラーコンデンサーの局部
での高濃度硝酸の生成が腐食原因となったと推察され
た。そこで、実機プロセスについて詳細に検討した結
果、単一のクーラーコンデンサーで低濃度から高濃度硝
酸が生成することが確認され、高濃度硝酸による腐食の
抑制にはSiの添加が効果的であり、濃厚硝酸用にSiを多
量に添加したステンレス鋼が開発されている。When SUS304L is used for a cooler condenser, severe corrosion may occur. That is, stainless steel of SUS304L class corrodes violently in high concentration of nitric acid, and it was presumed that the formation of high concentration of nitric acid locally in the cooler condenser caused corrosion. Therefore, as a result of a detailed study of the actual process, it was confirmed that high-concentration nitric acid was produced from a low concentration in a single cooler condenser, and that the addition of Si was effective in suppressing corrosion due to high-concentration nitric acid. Stainless steel containing a large amount of Si for nitric acid has been developed.
【０００５】前記したようなSUS304L や高Si型ステンレ
ス鋼などの従来材における腐食量におよぼす硝酸濃度の
影響は図１に示す○□の測定点の如くであって、Siの添
加によって高濃度硝酸中での腐食量が少なくなるのに対
して、低濃度硝酸中では逆に腐食量は多くなる。即ちSi
の添加は高濃度硝酸での耐食性を改善するとしても、低
濃度硝酸での耐食性を損なうなどの難点がある。前述の
ような製造条件よりすると低濃度から高濃度の広い濃度
範囲で優れた耐食性を示す材料が必要なものの、このよ
うなステンレス鋼種はいまだ開発されていない。[0005] The effect of nitric acid concentration on the amount of corrosion of conventional materials such as SUS304L and high Si stainless steel as described above is as shown by the measurement points indicated by □ shown in FIG. 1. In contrast, the amount of corrosion decreases in low-concentration nitric acid, whereas the amount of corrosion decreases in nitric acid. That is, Si
Although the addition of N can improve the corrosion resistance at high concentration of nitric acid, it has disadvantages such as impairing the corrosion resistance at low concentration of nitric acid. Under the above manufacturing conditions, a material showing excellent corrosion resistance in a wide concentration range from a low concentration to a high concentration is required, but such a stainless steel type has not yet been developed.
【０００６】[0006]
【課題を解決するための手段】本発明は上記したような
従来技術における課題を解決することについて検討を重
ね、SiとCrの含有量についてその比率を最適化すること
により低濃度から高濃度に亘る広い硝酸濃度範囲におい
て優れた耐食性を示すことのできるオーステナイトステ
ンレス鋼を得ることに成功したものであって、以下の如
くである。SUMMARY OF THE INVENTION The present invention has been studied to solve the problems in the prior art as described above, and from a low concentration to a high concentration by optimizing the ratio of the contents of Si and Cr. An austenitic stainless steel capable of exhibiting excellent corrosion resistance in a wide range of nitric acid concentration has been successfully obtained as follows.
【０００７】（１） 重量％で、Ｃ：０．０３７〜０．
１％、Ｓｉ：２．０〜４．０％、Ｃｒ：１６．０〜２５
％、Ｍｎ：１．０〜２．０％、Ｎｉ：９．０〜１７％、
Ｓ：０．００１〜０．０１％、Ｐ：０．００５〜０．０
４％を含有し、残部鉄および不可避的不純物からなるこ
とを特徴とする耐硝酸腐食特性に優れたオーステナイト
ステンレス鋼。(1) C: 0.037-0 .
1%, Si: 2.0 to 4.0%, Cr: 16.0 to 25
%, Mn: 1.0 to 2.0%, Ni: 9.0 to 17%,
S: 0.001 to 0.01%, P: 0.005 to 0.0
Austenitic stainless steel having excellent nitric acid corrosion resistance, containing 4% and the balance of iron and unavoidable impurities.
【０００８】（２） Si／Crが0.０８〜0.２５であるこ
とを特徴とした前記（１）項に記載の耐硝酸腐食特性に
優れたオーステナイト系ステンレス鋼。(2) The austenitic stainless steel having excellent nitric acid corrosion resistance described in (1), wherein Si / Cr is 0.08 to 0.25.
【０００９】即ち、斯かる本発明について更に説明する
と、ステンレス鋼（１１〜２５％Cr−0.４〜６％Si−１
０〜２５％Ni）を低濃度硝酸および高濃度硝酸について
代表的な４０％と９０％硝酸中に浸漬したときの、腐食
量を、Si含有量に対して整理すると図２に示す如くであ
り、ステンレス鋼のSi含有量を高めることにより、高濃
度硝酸（図中○で示す）中での腐食量は減少した。即ち
その減少傾向はSi含有量にのみ依存しており、約２％Si
（1.８％Si程度）までは急激であって、それ以上では緩
慢であった。この結果から、高濃度硝酸におけるステン
レス鋼の実用上の耐食性は、約２％Si以上で満足するも
のと判断される。More specifically, the present invention will be described in further detail. Stainless steel (11 to 25% Cr-0.4 to 6% Si-1)
FIG. 2 shows the amount of corrosion when immersed in 0% to 25% Ni) in typical 40% and 90% nitric acid for low-concentration nitric acid and high-concentration nitric acid with respect to the Si content. By increasing the Si content of stainless steel, the amount of corrosion in high-concentration nitric acid (indicated by a circle in the figure) was reduced. That is, the decreasing tendency depends only on the Si content, and is about 2% Si
(Approximately 1.8% Si), and was slower than that. From these results, it is determined that the practical corrosion resistance of stainless steel in high-concentration nitric acid is satisfactory if it is about 2% Si or more.
【００１０】一方、低濃度硝酸中での腐食量は、Siの添
加量とともに大きくなった（図中△で示す）が、その傾
向はCr含有量によって異なり、Cr含有量が多い鋼種ほど
Si添加による腐食量の増加傾向は小さくなった。Siの添
加量が２〜４％の範囲なら、１６〜２５％Crのステンレ
ス鋼で、低濃度硝酸に対して実用上十分な耐食の確保が
可能になると判断された。On the other hand, the amount of corrosion in low-concentration nitric acid increased with the amount of Si added (indicated by △ in the figure), but the tendency varied depending on the Cr content.
The tendency of the increase of the corrosion amount by the addition of Si became smaller. It was determined that if the amount of Si added was in the range of 2 to 4%, it was possible to secure practically sufficient corrosion resistance to low-concentration nitric acid with 16 to 25% Cr stainless steel.
【００１１】これらの結果から本発明者らは、SiとCrの
含有量の比率の最適化により低濃度から高濃度の広い濃
度範囲で優れた耐食性を示すオーステナイトステンレス
鋼を見出すことに成功した。この成分範囲のステンレス
鋼ならば、その材質と製造性、加工性、経済性はSUS304
L クラスのステンレス鋼に匹敵するものと言える。From these results, the present inventors have succeeded in finding an austenitic stainless steel exhibiting excellent corrosion resistance in a wide concentration range from a low concentration to a high concentration by optimizing the content ratio of Si and Cr. With stainless steel in this composition range, its material, manufacturability, workability, and economy are SUS304.
It is comparable to L-class stainless steel.
【００１２】[0012]
【作用】上記した本発明についてその成分組成限定理由
を説明すると、以下の如くである。 Ｃ：０．０３７〜０．１％。 ステンレス鋼を高温（約６００℃）で時効すると、クロ
ム炭化物が析出する。この炭化物はクロム欠乏層を伴う
ため、耐食性を損なう（鋭敏化）。クロム炭化物の析出
による耐食性の低下は炭素含有量に依存し、含有量が多
いと短時間で生じる。溶接などによる加熱操作はこのよ
うな現象を引き起こす。したがって、鋭敏化防止の観点
から、ステンレス鋼の炭素含有量の低減化が望ましい。
ただし、炭素は有効なオーステナイト形成元素であり、
固溶強化による強度維持の役割も果たしている。このよ
うな観点から炭素含有量は０．０３７％以上、０．１％
以下と決定された。The reasons for limiting the composition of the present invention will be described below. C: 0.037 to 0.1%. When aging stainless steel at high temperatures (about 600 ° C.), chromium carbides precipitate. Since this carbide is accompanied by a chromium-depleted layer, corrosion resistance is impaired (sensitization). The decrease in corrosion resistance due to the precipitation of chromium carbide depends on the carbon content, and a large content occurs in a short time. A heating operation such as welding causes such a phenomenon. Therefore, from the viewpoint of preventing sensitization, it is desirable to reduce the carbon content of stainless steel.
However, carbon is an effective austenite-forming element,
It also plays a role in maintaining strength by solid solution strengthening. From such a viewpoint, the carbon content is 0.037 % or more and 0.1% or more.
It was decided that:
【００１３】Si：2.０〜4.０％。 Siについては、高濃度硝酸中の耐食性維持のために積極
的な合金化が必要なものの、添加量があまり多いと低濃
度硝酸中の耐食性の維持が困難になる。また、Siはその
含有量の増加とともに凝固時のデルタ・フェライト形成
量を増し、シグマ相などの析出物の形成を促進する。そ
れらは、熱間や温間、冷間での延性や靭性を低下させる
ため、板や管などの鋼材を製造する際の歩留りの低下や
製造範囲が制限される。このようにSiは耐食性の確保や
工業的規模での製造の観点から、２％以上、４％以下に
限定される。Si: 2.0 to 4.0%. For Si, active alloying is necessary to maintain the corrosion resistance in high-concentration nitric acid, but if the addition amount is too large, it becomes difficult to maintain the corrosion resistance in low-concentration nitric acid. In addition, Si increases the amount of delta ferrite formed during solidification as its content increases, and promotes the formation of precipitates such as sigma phase. They reduce the ductility and toughness in hot, warm and cold conditions, and therefore reduce the yield and range of production of steel products such as plates and tubes. As described above, Si is limited to 2% or more and 4% or less from the viewpoint of securing corrosion resistance and manufacturing on an industrial scale.
【００１４】Cr：１6.０〜２5.０％。 Crは、低濃度硝酸における耐食性確保のためにCr含有量
を１６％以上とすることが必要である。しかし、多量に
加えても耐食性の改善効果は飽和してくるうえに、オー
ステナイト組織を確保するためNi含有量を高めなければ
ならず経済性を損なうため、上限を２５％以下とする。Cr: 16.0 to 25.0%. Cr needs to have a Cr content of 16% or more in order to ensure corrosion resistance in low-concentration nitric acid. However, even if a large amount is added, the effect of improving the corrosion resistance is saturated, and the Ni content must be increased in order to secure an austenite structure, which impairs economic efficiency. Therefore, the upper limit is set to 25% or less.
【００１５】Mn：1.０〜2.０％。 Mnは、脱酸剤として働き、オーステナイト組織の安定化
への寄与も示す合金元素である。ただし、このMnは鋼中
で硫化物を形成し、棒状の介在物として存在する。これ
らの介在物は局部腐食の発生位置となるので、耐食性は
介在物の数量に反比例する。これらを勘案して最適含有
量を1.０％以上、2.０％以下とした。Mn: 1.0 to 2.0%. Mn is an alloy element that functions as a deoxidizing agent and also contributes to stabilization of the austenite structure. However, this Mn forms sulfide in steel and exists as rod-like inclusions. Since these inclusions are the locations where local corrosion occurs, the corrosion resistance is inversely proportional to the number of inclusions. Taking these factors into consideration, the optimum content is set to 1.0% or more and 2.0% or less.
【００１６】Ni：9.０〜１7.０％。 ステンレス鋼に耐酸性を付与するためには、Niの添加が
必須である。即ち、NiはCrと共存することにより、不動
態化の促進とともに不動態を強固にする。低濃度側硝酸
中では環境の酸化力によって不動態化が容易に達成され
るものの、Niの添加によってさらなる効果が見込まれ
る。また、Niはオーステナイト相の形成と安定化にとっ
て主要な元素である。ただし、Niは非常に高価な金属で
あるため、必要以上の添加は経済性を損なう。このよう
な観点からNi添加量が決定され、9.０％以上、１７％以
下とした。Ni: 9.0 to 17.0%. In order to impart acid resistance to stainless steel, the addition of Ni is essential. That is, Ni coexists with Cr to promote passivation and strengthen passivation. Passivation is easily achieved in the low-concentration nitric acid by the oxidizing power of the environment, but further effects are expected by the addition of Ni. Ni is a major element for the formation and stabilization of the austenitic phase. However, since Ni is a very expensive metal, excessive addition impairs economic efficiency. From such a viewpoint, the amount of Ni added is determined, and is set to be not less than 9.0% and not more than 17%.
【００１７】Ｓ：0.００１〜0.０１％。 Ｓは、不可避な不純物であり、Mnと化合物を作り耐食性
を悪化させる。しかし、硝酸中ではＳ含有量を0.００１
％より低下させても耐食性はほとんど変化しないためＳ
含有量を0.００１％以上、0.０１％以下とする。S: 0.001 to 0.01%. S is an inevitable impurity and forms a compound with Mn to deteriorate the corrosion resistance. However, in nitric acid, the S content is 0.001.
%, The corrosion resistance hardly changes,
The content is set to 0.001% or more and 0.01% or less.
【００１８】Ｐ：0.００５〜0.０４％。 Ｐは、硝酸中の耐食性を決定する重要な元素であり、低
い方が望ましく、硝酸中での耐食性をSiの添加によって
も維持し難くなるので上限を0.０４％とする。しかし、
ステンレス鋼の精錬による脱燐処理は難しく、現実には
低不純物原料の使用に頼るしかない。そのため、0.００
５％未満のような低燐のステンレス鋼は非常に高価とな
り、現実的ではない。P: 0.005 to 0.04%. P is an important element that determines the corrosion resistance in nitric acid, and it is desirable that P is low, and it is difficult to maintain the corrosion resistance in nitric acid even by the addition of Si, so the upper limit is made 0.04%. But,
Dephosphorization treatment by refining stainless steel is difficult, and in reality, the only option is to use low-impurity raw materials. Therefore, 0.00
Low phosphorus stainless steels, such as less than 5%, are very expensive and impractical.
【００１９】Si／Cr：0.０８〜0.２５。 Si／Crが0.０８未満であると図３に示すように高濃度硝
酸における腐食量が急激に上昇し、一方このSi／Crが0.
２５を超えると低濃度硝酸における腐食量が著しく増大
する。このSi／Crを0.０８〜0.２５とすることにより高
濃度域から低濃度域の全般に亘って腐食量を低く維持す
ることができる。Si / Cr: 0.08 to 0.25. When Si / Cr is less than 0.08, the amount of corrosion in high-concentration nitric acid sharply increases as shown in FIG.
If it exceeds 25, the amount of corrosion at low concentration of nitric acid will increase significantly. By setting the ratio of Si / Cr to 0.08 to 0.25, the amount of corrosion can be kept low from the high concentration region to the low concentration region.
【００２０】本発明によるものの特徴は成分系に存する
ものであるが、好ましい製造法としては一般的に９５０
〜１１５０℃、特に１０００℃以上の如きに８〜１５時
間均熱してから圧延し、仕上り温度８００〜９００℃で
熱延を終了し、５〜２０分の固溶化均熱処理し、直ちに
水冷するような方法が適切である。Although the features of the present invention reside in the component system, the preferred production method is generally 950.
Rolling after soaking at 8 to 15 hours at a temperature of １1150 ° C., especially 1000 ° C. or more, finishing hot rolling at a finishing temperature of 800 to 900 ° C., performing solution soaking for 5 to 20 minutes, and immediately cooling with water. The appropriate method is appropriate.
【００２１】[0021]
【実施例】本発明によるものの具体的な実施例について
説明すると、本発明者等は具体的に本発明オーステナイ
トステンレス鋼を製造し実機のクーラーコンデンサーを
実験室的に模擬した条件で適用化の検討をなした。即ち
このような本発明鋼および比較のための従来鋼について
の成分組成および製造性、加工性および耐食性を要約し
て示すと、次の表１の如くである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete examples of the present invention will be described. The present inventors specifically manufactured the austenitic stainless steel of the present invention and examined the application of the cooler condenser of an actual machine under laboratory conditions. Made. That is, the composition of the components of the steel of the present invention and the conventional steel for comparison, the manufacturability, workability and corrosion resistance are summarized and shown in Table 1 below.
【００２２】[0022]
【表１】 [Table 1]
【００２３】この表１に示した各鋼の製造は何れも１２
００℃で１０時間の均熱をなし、１パスを目標圧下率の
１０％となし、目標圧延仕上り温度を８５０℃、固溶化
熱処理１１００℃で３０分間の均熱をなし、その後直ち
に水冷する製造法に従った。The production of each steel shown in Table 1 was 12
Production at 100 ° C for 10 hours, 1 pass at 10% of target reduction, target rolling finish temperature at 850 ° C, solution heat treatment at 1100 ° C for 30 minutes, then water cooling immediately. Followed the law.
【００２４】即ち前記表１において、製造性は、この表
１の組成をもった材料を溶解・圧延し、圧延後の鋼材に
生じていた割れや傷の発生状態を調べて、それらの発生
数が少ないほど製造性が良好と判断した。また加工性は
Ｃ型試験片（JIS Z 2204の１号試験片）を用いて、JISZ
2248の押し曲げ法で曲げ試験を行い割れの発生の有無を
調べ、加工性の目安とした。更に耐食性は、沸騰硝酸中
に浸漬してその腐食量から評価した。ここで○は優、△
は良、×は不可を示すものである。That is, in Table 1 above, the manufacturability is determined by melting and rolling a material having the composition shown in Table 1 and examining the state of occurrence of cracks and scratches in the steel material after rolling. It was determined that the smaller the value, the better the productivity. The workability was measured using a C-type test piece (No. 1 test piece of JIS Z 2204).
A bending test was performed by the push-bending method of 2248, and the presence or absence of cracks was examined. Further, the corrosion resistance was evaluated by immersing it in boiling nitric acid and examining the corrosion amount. Here ○ is Yu, △
Indicates good, and x indicates unacceptable.
【００２５】前述したような表１によるときは、本発明
鋼によるものは製造性、加工性および耐食性のすべてに
ついて優れた結果が得られ、実機硝酸環境中で安定した
耐食性が保証されている。これに対し従来鋼によるもの
は何れか１つまたは２つ以上において好ましいものでな
く、特に耐食性において高Si、且つ高Niである１８番お
よび２０番以外は何れも不可である。According to Table 1 as described above, the steel according to the present invention has excellent results in all of the manufacturability, workability and corrosion resistance, and stable corrosion resistance in the actual nitric acid environment is guaranteed. On the other hand, the conventional steel is not preferable in any one or two or more steels. In particular, any steel other than No. 18 and No. 20 having high Si and high Ni in corrosion resistance is impossible.
【００２６】[0026]
【発明の効果】以上説明したような本発明によるときは
高濃度域から低濃度域の全般に亘って好ましい耐食性を
保持し、しかも固溶強化による強度維持を図り、実機硝
酸環境において卓越した安定な耐食性を保証し得るもの
であって、硝酸製造プラントのクーラーコンデンサー用
などに供して優れた特性を発揮せしめ得、工業的にその
効果の大きい発明である。According to the present invention as described above, the preferred corrosion resistance is maintained over the entire range from the high concentration range to the low concentration range, and the strength is maintained by solid solution strengthening. It is an invention which can guarantee excellent corrosion resistance, can be used for a cooler condenser in a nitric acid production plant, and can exhibit excellent characteristics, and is industrially highly effective.
【図１】硝酸濃度と腐食量の関係を従来鋼によるもの
と、本発明鋼によるものとを併せて示した図表である。FIG. 1 is a table showing the relationship between the nitric acid concentration and the amount of corrosion for a conventional steel and for a steel according to the present invention.
【図２】Si含有量と腐食量の関係を、高濃度硝酸と低濃
度硝酸の場合を併せて示した図表である。FIG. 2 is a table showing the relationship between the Si content and the amount of corrosion in the case of high-concentration nitric acid and low-concentration nitric acid.
【図３】Si／Cr比と腐食量の関係を高濃度硝酸および低
濃度硝酸の場合について要約して示した図表である。FIG. 3 is a table summarizing the relationship between the Si / Cr ratio and the amount of corrosion in the case of high-concentration nitric acid and low-concentration nitric acid.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 神浦 眞帆 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (72)発明者 酒井 裕雄 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 平５−156411（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 38/00 - 38/60──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Maho Kamiura 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Hiroo Sakai 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan (56) References JP-A-5-156411 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C22C 38/00-38/60
Claims (2)
Ｓｉ：２．０〜４．０％、Ｃｒ：１６．０〜２５％、Ｍ
ｎ：１．０〜２．０％、Ｎｉ：９．０〜１７％、Ｓ：
０．００１〜０．０１％、Ｐ：０．００５〜０．０４％
を含有し、残部鉄および不可避的不純物からなることを
特徴とする耐硝酸腐食特性に優れたオーステナイトステ
ンレス鋼。(1) C: 0.037 to 0.1% by weight,
Si: 2.0 to 4.0%, Cr: 16.0 to 25%, M
n: 1.0 to 2.0%, Ni: 9.0 to 17%, S:
0.001 to 0.01%, P: 0.005 to 0.04%
Austenitic stainless steel excellent in nitric acid corrosion resistance, characterized by containing iron and inevitable impurities.
徴とした請求項１に記載の耐硝酸腐食特性に優れたオー
ステナイト系ステンレス鋼。2. The austenitic stainless steel having excellent nitric acid corrosion resistance according to claim 1, wherein Si / Cr is 0.08 to 0.25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116678A JP2806145B2 (en) | 1992-04-10 | 1992-04-10 | Austenitic stainless steel with excellent nitric acid corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116678A JP2806145B2 (en) | 1992-04-10 | 1992-04-10 | Austenitic stainless steel with excellent nitric acid corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05287460A JPH05287460A (en) | 1993-11-02 |
| JP2806145B2 true JP2806145B2 (en) | 1998-09-30 |
Family
ID=14693175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4116678A Expired - Fee Related JP2806145B2 (en) | 1992-04-10 | 1992-04-10 | Austenitic stainless steel with excellent nitric acid corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2806145B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5418734B2 (en) * | 2011-07-29 | 2014-02-19 | 新日鐵住金株式会社 | Method for producing austenitic stainless steel |
| JP5212581B1 (en) * | 2011-07-29 | 2013-06-19 | 新日鐵住金株式会社 | Method for producing high Si austenitic stainless steel |
| WO2017195372A1 (en) * | 2016-05-13 | 2017-11-16 | 新日鐵住金株式会社 | Austenitic stainless steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05156411A (en) * | 1991-12-05 | 1993-06-22 | Nippon Stainless Steel Co Ltd | High Si austenitic stainless cast steel for concentrated nitric acid with excellent castability and toughness |
-
1992
- 1992-04-10 JP JP4116678A patent/JP2806145B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05287460A (en) | 1993-11-02 |
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