金属材料の耐食性
耐食用材料の選定にあたっては、流体の種類、性質、圧力、温度条件等を基に、実践データを加味して選定する必要があります。
本表は一つの参考を示すものであって、実際使用に当たっては、さまざまな状況を十分に考慮した上で決定してください。
耐 食 階 級
| 耐食階級 | 腐食率（ｍｍ/Ｙ） | 摘 要 | ||||||||||||
| Ａ | 0.125 以内 | 腐食率がきわめて小さく、弁本体およびトリム材料として最適。 | ||||||||||||
| Ｂ | 0.125～1.25 | この材料はこれより耐食性のよい材料が高価であったり、また、実用上使用不可の時、ある程度の腐食が許される部分に使用される。 | ||||||||||||
| Ｃ | 1.25 以上 | 使用不可能を意味する。 | ||||||||||||
| 腐食条件 | 炭素鋼 | 鋳鉄 | ステンレス鋼 | 青銅 | ニッケル | モネル | ハステロイＢ | ハステロイＣ | インコネル | チタン | ジルコニウム | 備考 | |||||||
| 濃度（％） | 温度（℃） | ＳＵＳ３０４ | ＳＵＳ３１６ | ＳＵＳ４４０Ｃ | SUS630(17-4PH) | 20℃-30N1 | |||||||||||||
| アセトン | 100 | 常温 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||
| 100 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| アセチレン | 100 | 常温 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | （イ） | |
| 100 | A | A | A | A | A | A | A | – | – | – | A | A | A | – | – | ||||
| アセトアルデヒド | 常温 | A | A | A | A | A | A | A | A | A | A | – | A | A | – | A | |||
| アニリン | 100 | 常温 | A | A | A | A | A-B | A-B | A | C | A-B | A-B | A | A | A | A | A | ||
| 亜硫酸ガス | 乾 | 常温 | A | A | A | A | A | A | A | – | – | – | – | A | A | A | – | ||
| 100 | A | A | A | A | A | A | A | – | – | – | – | A | A | A | – | ||||
| 湿 | 5 | 常温 | C | C | A | A | A | – | A | – | C | – | A | A | A | B | – | ||
| 全濃度 | 100 | C | C | B | B | C | – | A | B | C | C | A | A | A | C | – | |||
| アルコール （ｴﾁﾙ） |
全濃度 | 常温 | A-B | A-B | A | A | A | A | A | A | A | A | A | A | A | A | A | ||
| アルコール （ﾒﾁﾙ） |
全濃度 | 常温 | A-B | A-B | A | A | A | A | A | A | A | A | A | A | A | A | A | ||
| 安息香酸 | 全濃度 | 常温 | C | C | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A | A | A-B | A | A | ||
| アンモニヤ | 100 （無水） |
常温 | A | A | A | A | A | A | A | A | A-B | A-B | A | A | A | – | – | ||
| アンモニヤ湿蒸気 | 常温 | A | A | A | A | A | A | A | C | C | C | A | A | A | A | – | |||
| 70 | B | B | A | A | – | – | A | C | C | C | A-B | A | A | A | – | ||||
| いおう （溶融） |
100 | A | A | A | A | A | A | A | C | A | A | – | A | A | – | – | |||
| エタン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| エチレン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| エチレン グリコール |
30 | A | A | A | A | A-B | A | A | A-B | – | – | A | A | – | A | A | |||
| 塩化亜鉛 | 5 | 常温 | C | C | C | B | C | C | A | B | A-B | A-B | A-B | A-B | – | A | A | （ロ） | |
| 沸騰 | C | C | C | C | C | C | A | B | – | A-B | A-B | A-B | – | A | A | ||||
| 塩化 アルミニウム |
5 | 常温 | C | C | A | A | – | A | A | C | B | A-B | – | A | A-B | A | A | ||
| 塩化 アンモニウム |
1 | 常温 | C | C | A | A | C | – | A | B | A | A | A | A | A | A | A | ||
| 10 | 沸騰 | C | C | C | B | C | – | A-B | C | A-B | A-B | A-B | A | A-B | A | A | |||
| 28 | 沸騰 | C | C | C | B | C | – | A-B | C | A-B | A-B | A | A | A-B | – | A | |||
| 50 | 沸騰 | C | C | C | B | C | – | A-B | C | A-B | A-B | – | A | A-B | – | – | |||
| 塩化いおう （乾） |
C | C | C | C | C | C | A-B | A-B | A-B | A-B | A-B | A | A-B | – | – | ||||
| 塩化エチル | 5 | 常温 | C | C | A | A | B | – | A | A-B | A | A | A | A | A | A | A | ||
| 塩化 エチレン |
100 | 常温 | A | A-B | A | A | A | A | A | A | A | A | A | A | A | A | – | ||
| 塩化 カルシウム |
0-60 | 常温 | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A | A | A | A | A | A | A | A | ||
| 塩化銀 | 常温 | C | C | C | C | C | C | B | C | A-B | A-B | Ｃ | A-B | – | A | – | （ハ） | ||
| 塩化第１錫 | 5 | 常温 | C | C | C | B | C | C | A-B | C | C | C | A-B | A-B | C | – | A | ||
| 塩化第２錫 | 5 | 常温 | C | C | C | B | C | C | A-B | C | C | C | A-B | A-B | C | A | C | ||
| 塩化ナトリウム | C | C | B | A-B | B | B | A | A-B | A | A | A | A | A | A | A | ||||
| 塩酸 | 1-5 | ＜30 | C | C | C | B | C | C | B | B | B | B | A | A | B | A-B | A | ||
| ＜50 | C | C | C | C | C | C | B | C | B | B | A | B | B | B | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | A | C | C | C | A | ||||
| 5-10 | ＜30 | C | C | C | C | C | C | B | B | B | B | A | A | B | B | A | |||
| ＜70 | C | C | C | C | C | C | C | C | C | C | A | B | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | A | C | C | C | A | ||||
| 10-20 | ＜30 | C | C | C | C | C | C | C | C | C | B | A | A | B | C | A | |||
| ＜70 | C | C | C | C | C | C | C | C | C | C | A | B<50℃ | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | B | C | C | C | B | ||||
| ＞20 | ＜30 | C | C | C | C | C | C | C | C | C | C | A | C | C | C | A | |||
| ＜80 | C | C | C | C | C | C | C | C | C | C | A | C | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | B | C | C | C | B | （ニ） | |||
| 塩素 | 乾 | ＜30 | A | A | A | A | A | A | A | A | A | A | A | – | A | C | A | ||
| 湿 | ＜30 | C | C | C | C | C | C | – | A | – | – | – | – | – | A | – | |||
| 腐食条件 | 炭素鋼 | 鋳鉄 | ステンレス鋼 | 青銅 | ニッケル | モネル | ハステロイＢ | ハステロイＣ | インコネル | チタン | ジルコニウム | 備考 | |||||||
| 濃度（％） | 温度（℃） | ＳＵＳ３０４ | ＳＵＳ３１６ | ＳＵＳ４４０Ｃ | SUS630(17-4PH) | 20℃‐30N1 | |||||||||||||
| 海水 | 常温 | C | C | A | A | C | A | A | A | – | A | A | A | – | A | A | （ﾎ） | ||
| 過酸化水素 | ＜30 | 常温 | – | – | A | A | A-B | A-B | A | C | A | A | A | A | A | A | A | ||
| 苛性ソーダ | ＜30 | A | A | A | A | A | A | A | B | A | A | A | A | A | A | A | |||
| ＜10 | ＜90 | A-B | A-B | A | A | A | A | A | B | A | A | A | A | A | A | A | |||
| 沸騰 | – | – | A | A | A | A | A | B | A | A | A | A | A | A | A | ||||
| ＜30 | A | A | A | A | A | A | A | B | A | A | A | A | A | A | A | ||||
| 10-30 | ＜100 | A | A | A | A | A | A | A | C | A | A | A | A | A | A | A | |||
| 沸騰 | – | – | B | B | – | – | A | C | A | A | A | A | A | – | – | ||||
| ＜30 | A | A | A | A | A | A | A | C | A | A | A | A | A | – | – | ||||
| 30-50 | ＜100 | B | B | A | A | – | B | A | C | A | A | A | A | A | – | – | |||
| 沸騰 | – | – | – | – | – | – | – | C | A | A | A | A | A | – | – | ||||
| ＜30 | C | C | B | B | – | – | B | C | A | A | A | A | A | – | – | ||||
| 50-70 | ＜80 | C | C | – | – | – | – | – | C | A | A | A | A | A | – | – | |||
| 沸騰 | C | C | – | – | – | – | – | C | A | A | A | A | A | – | – | ||||
| 70-100 | ≦260 | – | – | B | B | – | – | B | – | A | B | B | B | B | – | – | |||
| 100 | ≧480 | – | – | C | C | – | – | C | – | A | B | B | B | B | – | – | |||
| ぎ酸 | ＜10 | 常温 | C | C | A | A | C | B | A | C | – | A-B | A | A | A-B | – | A | ||
| 5 | ＜70 | C | C | A-B | A | A | A | A | C | A-B | A-B | A | A | A | A | A | |||
| 15 | 常温 | C | C | A-B | A | B | A-B | A | C | A-B | A-B | A | A | A | A | A | |||
| 沸騰 | C | C | A-B | A | B | – | A | C | A-B | A-B | A | A | A-B | A | A-B | ||||
| 濃 | 沸騰 | C | C | C | B | – | – | A | C | – | – | A | A | – | A | – | |||
| クレオソート | A | A | A | A | A | A | A | C | A | A | A | A | A | – | – | ||||
| クロム酸 | 5 | ＜66 | C | C | B | B | C | – | A-B | C | C | C | – | A-B | A-B | A | A | ||
| 10 | 沸騰 | C | C | C | C | C | – | – | C | C | C | – | A-B | B | A | A | |||
| 濃 | 沸騰 | C | C | C | C | C | – | – | C | C | C | – | – | – | A | A | |||
| クロム酸ナトリウム | – | – | A | A | – | A | – | A | A | A | – | – | A | – | – | ||||
| 酢酸 | ≦10 | ≦30 | C | C | A | A | A-B | A | A | B-C | A | A | A | A | A | A | A | ||
| 沸騰 | C | C | A | A | – | – | A | B-C | – | A-B | A | A | A | A | A | ||||
| 10-20 | ＜60 | C | C | A | A | – | – | A | – | A | – | – | A | – | A | A | |||
| 沸騰 | C | C | A | A | – | – | A | – | – | – | – | A | – | A | A | ||||
| 20-50 | ＜60 | C | C | A | A | – | – | A | – | A | A | A | A | – | A | A | |||
| 沸騰 | C | C | A | A | – | – | A | – | – | – | A | A | – | A | A | ||||
| 50～ | ＜60 | C | C | A | A | – | – | A | – | – | – | A | A | – | A | A | |||
| 99.5 | 沸騰 | C | C | A | A | – | – | A | – | – | – | A | A | – | A | A | |||
| 無水 | 常温 | C | C | A-B | A | – | – | A | – | – | – | A | A | – | A | A | |||
| 酢酸ナトリウム | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A-B | A | A | ||||
| 次亜塩素酸 ナトリウム |
＜20 | 常温 | C | C | C | B | C | C | B | C | C | C | – | A | C | A | A | ||
| 四塩化炭素 | B | B | A | A | B | A | A | A | A | A | A | A | A | A | A | ||||
| しゅう酸 | 5 | 常温 | C | C | A-B | A-B | A-B | A-B | A | – | C | A-B | A | A | A | A-B | A | ||
| 10 | 常温 | C | C | A-B | A-B | A-B | A-B | A | – | C | A-B | A | A | A | C | A | |||
| 沸騰 | C | C | C | A-B | C | C | A | – | C | A-B | B | A | A | C | A | ||||
| 硝酸 | ≦0.5 | ≦30 | C | C | A | A | A | A | A | C | C | C | C | A | A | A | A | ||
| ≦60 | C | C | A | A | A | A | A | C | C | C | C | A | A | A | A | ||||
| 沸騰 | C | C | A | A | A | A | A | C | C | C | C | A | A | A | A | ||||
| 0.5-20 | ≦30 | C | C | A | A | A | A | A | C | C | C | C | A | A | A | A | |||
| ≦60 | C | C | A | A | A | A | A | C | C | C | C | A | – | A | A | ||||
| 沸騰 | C | C | A | A | – | – | A | C | C | C | C | A | – | A | A | ||||
| 20-40 | ≦30 | C | C | A | A | A | A | A | C | C | C | C | A | A | A | A | |||
| ≦60 | C | C | A | A | – | – | A | C | C | C | C | A | – | A | A | ||||
| 沸騰 | C | C | A | A | – | – | A | C | C | C | C | – | – | C | A | ||||
| 40-70 | ≦30 | C | C | A | A | A | A | A | C | C | C | C | – | – | A | A | |||
| ≦60 | C | C | A | A | – | – | A | C | C | C | C | – | – | A | A | ||||
| 沸騰 | C | C | B | B | – | – | B | C | C | C | C | – | – | C | A | ||||
| 70-80 | ≦30 | C | C | B | A | A-B | A-B | A | C | C | C | C | – | – | A | A | |||
| ≦60 | C | C | A | A | – | – | B | C | C | C | C | – | – | A | A | ||||
| 沸騰 | C | C | C | C | – | – | C | C | C | C | C | – | – | C | A | ||||
| 80-95 | ≦30 | C | C | A | A | – | – | A | C | C | C | C | – | – | A | A | |||
| ≦60 | C | C | A | A | – | – | B | C | C | C | C | – | – | A | A | ||||
| 沸騰 | C | C | C | C | – | – | C | C | C | C | C | – | – | – | – | ||||
| ＞95 | ＜30 | A | – | A | A | – | – | A | – | – | – | – | – | – | A | A | |||
| 硝酸銀 | C | C | A | A | A-B | A-B | A | C | C | C | A-B | A-B | – | A | A | ||||
| 水酸化カリウム | 5 | 常温 | A-B | A-B | A | A | A-B | A | A | B | A | A | A-B | A | A-B | A | A | ||
| 27 | 沸騰 | A-B | A-B | A | A | A-B | – | A-B | B | A | A | A-B | A-B | A-B | C | A | |||
| 50 | 沸騰 | – | – | B | A | – | – | A-B | – | A | A | A-B | A-B | A-B | C | A | |||
| 腐食条件 | 炭素鋼 | 鋳鉄 | ステンレス鋼 | 青銅 | ニッケル | モネル | ハステロイＢ | ハステロイＣ | インコネル | チタン | ジルコニウム | 備考 | |||||||
| 濃度（％） | 温度（℃） | ＳＵＳ３０４ | ＳＵＳ３１６ | ＳＵＳ４４０Ｃ | SUS630(17-4PH) | 20℃-30N1 | |||||||||||||
| 水酸化 ﾏｸﾞﾈｼｳﾑ（濃） |
常温 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | |||
| 水素 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| 水銀 | A | A | A | A | A | A | A | C | A-B | A-B | A | A | A | – | – | ||||
| ステアリン酸（濃） | 50 | – | C | A | A | A-B | A-B | A | C | A-B | A-B | A | A | A-B | A | – | |||
| タール | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| 炭酸ナトリウム | 全濃度 | 常温 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||
| チオ硫酸ナトリウム | 20 | 常温 | C | C | A-B | A-B | – | – | A | – | – | – | A | A | – | – | – | ||
| テレビン | B | B | A | A | – | – | A | A | – | B | A | A | A | A | A | ||||
| トリクレン | A-B | A-B | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| 二酸化炭素 | 乾 | 常温 | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||
| 湿 | C | C | A | A | A | A | A | B | – | – | – | A | A | A | A | ||||
| 二硫化炭素 | A | A | A | A | B | – | A | C | – | B | A | A | A | A | A | ||||
| ピクリン酸 | C | C | A-B | A-B | A-B | A-B | A | C | C | C | C | A | A-B | – | – | ||||
| ふっ酸 | C | C | C | C | C | C | C | C | C | A-B | A | B | C | C | C | （へ） | |||
| C | C | C | A | C | C | C | C | C | A | A | A-B | C | C | C | （ト） | ||||
| フレオン | 乾 | A-B | A-B | A | A | A | A | A | A | – | A | A | A | – | A | – | |||
| 湿 | B | B | B | A | – | – | A | A | – | A | A | A | – | A | – | ||||
| プロパン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| プダン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| ベンジン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| ほう酸 | C | C | A | A | B | A | A | A-B | A-B | A-B | A | A | A-B | A | A | ||||
| ホルムアルデヒド | B | B | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| ミルク | – | – | A | A | – | – | A | – | – | – | A | A | – | – | – | ||||
| メチルエチルケトン | A | A | A | A | A | A | A | A | A | A | A | A | A | A | A | ||||
| 硫化水素 | 湿 | B-C | C | A-B | A-B | – | – | B | C | C | – | – | A | B | A | – | |||
| 硫酸 | ≦0.25 | ≦30 | C | C | A | A | C | A-B | A | A-B | C | A | A | A | – | – | A | ||
| ≦60 | C | C | A | A | C | A-B | A | A-B | C | A | A | A | – | – | A | ||||
| 沸騰 | C | C | – | – | C | – | A | C | C | A | A | A | – | – | A | ||||
| 0.5-5 | ≦30 | C | C | B | B | C | – | A | C | C | C | A | A | C | C | A | |||
| ≦60 | C | C | C | B | C | – | A | C | C | C | A | A | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A | ||||
| 5-25 | ≦30 | C | C | C | B-C | C | C | A | C | C | C | A | A | C | C | A | |||
| ≦50 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | B<80℃ | C | C | C | A | B | C | C | A | ||||
| 25-50 | ≦30 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A | |||
| ≦50 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | B | C | C | C | – | ||||
| 50-60 | ≦30 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A | |||
| ≦60 | C | C | C | C | C | C | B | C | C | C | A | B | C | C | A | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | B | C | C | C | A-B | ||||
| 60-75 | ≦30 | C | C | C | C | C | C | A | C | C | C | A | A | C | C | A-B | |||
| ≦60 | C | C | C | C | C | C | B | C | C | C | A | B | C | C | A-B | ||||
| 沸騰 | C | C | C | C | C | C | C | C | C | C | B | C | C | C | C | ||||
| 75-95 | ≦30 | B | – | B | B | C | C | A | C | C | C | A | – | – | – | A | |||
| ≦50 | C | – | C | B | C | C | B | C | C | C | A | – | – | – | A | ||||
| 沸騰 | C | – | C | C | C | C | C | C | C | C | – | – | – | – | – | ||||
| 95-100 | ≦30 | A>98% | – | A>98% | A>98% | – | – | A | – | C | C | A | A | – | – | – | |||
| ≦50 | B>98% | – | B>98% | B>98% | C | C | A-B | – | C | C | A | B-C | – | – | – | ||||
| 沸騰 | – | – | – | – | – | – | C | – | C | C | C | C | – | – | – | ||||
| 硫酸亜鉛 | 5 | 常温 | – | – | A | A | – | – | A | A | A-B | A-B | A | A | A-B | – | – | ||
| 飽和 | 常温 | – | – | A | A | – | – | A | A | – | – | A | A | A-B | – | – | |||
| 25 | 沸騰 | – | – | A | – | – | – | A | B | – | – | A | A | – | – | – | |||
| 硫酸アンモニウム | 1-5 | 常温 | – | – | A | A | – | – | A | – | A | A | A | A | A | A | A | ||
| 硫酸銅 | ＜25 | ＜100 | – | – | – | – | – | – | A | – | – | – | – | A | – | A | A | ||
| りん酸 | ≦65 | ≦30 | C | C | A＜50% | A | – | – | A | – | – | – | A | A | A＜50% | – | A | ||
| ≦70 | C | C | A | A | – | – | A | – | – | A | A | A | – | A＜25% | A | （チ） | |||
| 沸騰 | C | C | A-B | A | – | – | A | – | – | – | A | A | – | – | A＜50% | ||||
| 65-85 | ≦30 | C | C | C | A | – | – | A | – | – | B | A | – | – | – | – | |||
| ≦90 | C | C | C | A | – | – | A | – | – | B | A | – | – | – | – | ||||
| 沸騰 | C | C | C | C | – | – | A | – | – | C | A-B | – | – | – | – | ||||
| 注： | （イ） 銅および銅合金は、水分が存在する場合は爆発する。 | （ホ） ステンレス鋼は孔食は発生するおそれがある。 |
| （ロ） SUS304、SUS316はﾋﾟｯﾄや応力腐食割れを生ずる可能性がある。 | （ヘ） 空気混入の場合のデータ。 | |
| (ハ） ステンレス鋼および炭素鋼は、水分は存在すれば”C”ランクとなる。 | （ト） 空気混入なしの場合のデータ。 | |
| （ニ） タンタルは30以上で、沸騰状態では”B”あるいは”C”ランクとなる。 | （チ） モネルの場合、空気混入なしのデータ。 |