| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing the corrosion of a piping constituted in such a way that high-temperature steam-reforming gas is passed through it and its external part is brought into contact with the cooled low-temperature steam-reforming gas. SOLUTION: As a material for the piping in which the high-temperature gas resultant from the steam reforming of hydrocarbon using a catalyst containing alkali metal elements is passed inside and the external part is brought into contact with the cooled low-temperature gas, a metallic material having a composition satisfying inequality 2Cr-Ni>22.5 in which respective contents of Cr and Ni elements are represented by weight percentage. COPYRIGHT: (C)2004,JPO&NCIPI
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