Chromium-rich cousins of C-276: better in oxidising media and in wet chlorine, with C-4 for hot ductility.
C-22 raises chromium and molybdenum to improve resistance to oxidising acids, hypochlorite and seawater while keeping the reducing-acid capability of the C family. It is the grade to reach for when the process alternates between oxidising and reducing conditions, or when chlorine is present.
C-4 keeps the same broad corrosion resistance but is stabilised for thermal stability, so it can be used in the as-welded condition at elevated temperature without the risk of grain-boundary precipitation. It is common in wet chlorine and hypochlorite equipment.
ASTM B564, B574, B575, B622; NACE MR0175 for sour service
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 detailNickel–molybdenum alloys for hydrochloric acid — any concentration, any temperature within the practical range.
Alloy detailOne alloy for seawater, sour gas and 600 °C strength — the workhorse of offshore and supercritical service.
Alloy detailQuotes within one business day. Send grade, size, pressure class, face type and quantity — a drawing works better than a description.
