Hastelloy C-4

Hastelloy C4 is a nickel-chromium-molybdenum alloy which has improved thermal stability. In this alloy, the tungsten was totally omitted and the iron content was reduced to approximately 1%. The alloy also contains approximately 0.3% Ti.

Outstanding high-temperature stability; exhibits good ductility and corrosion resistance after long-time aging at 650 to 1040 °C (1200-1900 ° F). Resists formation of grain-boundary precipitates in weld heat-affected zones, and is suitable for most chemical process applications in the as-welded condition. Has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1040 °C (1900 °F).

Hastelloy C4 has exceptional resistance to a variety of chemical process environments, including hot contaminated mineral acids, solvents, chlorine, and chlorine-contaminated media (organic and inorganic, dry chlorine, formic and acetic acids, acetic anhydride, seawater, and brine).

Chemical processing involving wet chlorine, hypochloric acid, hydrochloric acid, acetic acid and acetic anhydride; flue gas scrubber systems; pickling operations; and electro-galvanizing.

Hastelloy C-4 has outstanding high-temperature stability, and has excellent resistance to stress-corrosion cracking and oxidizing atmospheres up to 1040°C. It has exceptional resistance to a wide variety of chemical process environments, including hot contaminated mineral acids, solvents, chlorine and chlorine contaminated media (organic and inorganic), formic and acetic acids, acetic anhydride, and seawater and brine solutions.