Alloy 400 TUBING UNS NO4400
This nickel-copper chemistry features a high intensity single-phase solid solution metallurgical structure. Alloy 400 has greater corrosion resistance than nickel under reducing conditions and is more resistant than copper under oxidizing conditions. This grade has been widely used in applications requiring strong resistance to corrosive environments featuring acids, alkalies and high temperature steam. It is all but immune to the stress corrosion cracking (SCC) induced by chlorides and most freshwater conditions. A very tough material (as measured by impact testing) Alloy 400 has excellent mechanical properties in sub-zero conditions. It does not undergo a ductile-to-brittle transformation even when cooled to the temperature of liquid hydrogen. On the opposite side of the temperature range, Alloy 400 performs well in temperatures up to 1000° F.
ASTM B163 /ASME SB163, ASTM B165, NACE MRO175
ALLOY 400 (UNS NO4400) CHEMICAL COMPOSITION % (MAX.)
Sulfuric Acid Environments – Organic/Inorganic Chlorides- Sour Gas
Well Environs – Pulp & Paper Production – Pollution Control – Sulfur
Compounds in Flue Gas – Sea Water