Hastelloy C4

Hastelloy C-4 is an austenitic low carbon nickel-molybdenum-chromium alloy. The main difference from other earlier developed alloys of similar chemical composition is the lower carbon, silicon, iron, and tungsten content. Such a chemical composition makes it exhibit excellent stability at 600-1040°C and improves resistance to intergranular corrosion (intergranular corrosion is a type of localized corrosion. It extends inward along the interface between metal grains) Corrosion. Mainly due to the difference in chemical composition between the surface and interior of the grain and the presence of grain boundary impurities or internal stress.), edge line corrosion sensitivity and weld heat affected zone corrosion can be avoided under appropriate manufacturing conditions. Hastelloy C-4 in a premium nickel-based material has excellent resistance to some of the most corrosive acids found in industrial use and also has good corrosion resistance in water, steam and mixtures of steam, air and carbon dioxide. Can be used in wet chlorine, hypochlorous acid, hydrochloric acid, and chloride devices. Suitable for all types of hot mineral acids, chlorine-containing media, acetic acid, acetic anhydride, sea water and salt water solutions and other corrosive substances.

The chemical composition of Hastelloy(r) C-4 is outlined in the following table.

Hastelloy C-4 has the following key properties:

• Has excellent resistance to stress corrosion cracking and high temperature oxidizing atmosphere capabilities.
• Excellent resistance to a variety of chemical process environments, including thermally contaminated inorganic acids, solvents, chlorine, formic and acetic acids, and brine.

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