Which of the following materials is not susceptible to high temperature hydrogen attack?
Which of the following materials is not susceptible to high temperature hydrogen attack?
300 Series Stainless Steels (300 Series SS) are generally known for their excellent high-temperature properties and corrosion resistance, which includes resistance to hydrogen attack up to certain conditions. On the other hand, Cr-Mo steels like 5 Cr-1Mo and 9Cr-1Mo are specifically designed for improved resistance to hydrogen attack but can still be susceptible under certain high-temperature and pressure conditions. Therefore, 300 Series SS is the material least susceptible to high-temperature hydrogen attack among the given options.
Materials affected by High-temperature Hydrogen Attack 300 series SS, as well as 5Cr, 9Cr, and 12Cr alloys, are not susceptible to HTHA at conditions normally seen in refinery units.