| 摘要 |
A Ni based alloy material, having a chemical composition which consists of by mass percent, C ‰¤ 0.03%, Si: 0.01 to 0.5%, Mn: 0.01 to 1.0%, P ‰¤ 0.03%, S ‰¤ 0.01%, Cr: not less than 20% to less than 30%, Ni: more than 40% to not more than 50%, Cu: more than 2.0% to not more than 5.0%, Mo: 4.0 to 10%, Al: 0.005 to 0.5%, W: 0.1 to 10% , N: more than 0.10% to not more than 0.35%, and optionally one or more elements selected from Ca ‰¤ 0.01% and Mg ‰¤ 0.01%, with the balance being Fe and impurities, and the formula of "0.5Cu + Mo ‰¥ 6.5" is satisfied, and further, having a surface hardness of a Vickers hardness of not less than 350 at 500°C, has a corrosion resistance equivalent to that of Ni based alloys having high Mo contents, such as Hastelloy C22 and Hastelloy C276 together with an excellent erosion resistance, in a severe environment at a temperature from 100 to 500°C where erosion, hydrochloric acid corrosion, and sulfuric acid corrosion occur.
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