Hastelloy C-4 is an austenitic low-carbon nickel-molybdenum-chromium alloy. The main difference between Hastelloy C-4 and other alloys of similar chemical composition developed earlier is the low carbon, silicon, iron, and tungsten content. Such a chemical composition makes it exhibit excellent stability at 650-1040°C, improves the ability to resist intergranular corrosion, and can avoid edge line corrosion sensitivity and weld heat-affected zone corrosion under appropriate manufacturing conditions.

Material characteristics
Excellent corrosion resistance to most corrosive media, especially in the reduced state.
Excellent local corrosion resistance among halides.
Application field
It has been widely used in most chemical fields and high-temperature environments. Typical application areas:
Flue Gas Desulfurization System
Pickling and acid regeneration plant
Production of acetic acid and agrochemicals
Titanium dioxide production (chlorine method)
Electrolytic plating

Chemical composition
             Ni                Cr         Fe         C        Mn       Si        Mo      Co      Ti        P         S

Min.   Balance         14.5                                                    14.0                                    0.01
Max.                        17.5     3.0      0.009     1.0     0.05     17.0     2.0      0.7    0.02