Alloy 825 (2.4858)

It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion.

	Cr	Mn	S	Si	Cr	Ni	Mo	Cu	Ti	Al	Fe
Min	0.05	1.0	0.03	0.5	19.5	38	2.5	1.5	0.6	0.2	22
Max	-	-	-	-	23.5	46	3.5	3.0	1.2	-	-

What are the characteristics of Incoloy 825?
• Excellent resistance to reducing and oxidizing acids
• Good resistance to stress-corrosion cracking
• Satisfactory resistance to localized attack like pitting and crevice corrosion
• Very resistant to sulfuric and phosphoric acids
• Good mechanical properties at both room and elevated temperatures up to approximately 550° C
• Permission for pressure-vessel use at wall temperatures up to 425°C