Titanium-stabilised nickel–iron–chromium alloy for sulphuric and phosphoric acid up to about 550 °C.
825 combines nickel, chromium, molybdenum and copper with a titanium addition that stabilises the alloy against intergranular attack after welding. The result is broad resistance to sulphuric and phosphoric acids, seawater and oxidising/reducing mixtures, with good mechanical properties up to about 550 °C.
It is a common choice for acid plant piping, seawater-cooled exchangers and sour gas components where C-276 would be over-specified.
ASTM B564, B425 (bar/forgings), B423 (pipe), B424 (plate)
The default alloy for mixed acids, chlorides and wet chlorine — and the grade most often specified when no one is sure what the stream will do.
Alloy detailChromium-rich cousins of C-276: better in oxidising media and in wet chlorine, with C-4 for hot ductility.
Alloy detailNickel–molybdenum alloys for hydrochloric acid — any concentration, any temperature within the practical range.
Alloy detailQuotes within one business day. Send grade, size, pressure class, face type and quantity — a drawing works better than a description.
