Hastelloy C Material Characterization

Hastelloy, is a super-low carbon nickel-based corrosion-resistant alloy developed and manufactured by Haynes International, Inc. This alloy primarily consists of nickel (Ni), molybdenum (Mo), and chromium (Cr). It is renowned for its excellent high-temperature performance, oxidation resistance, and corrosion resistance in weld-affected zones.

Hastelloy alloys exhibit excellent corrosion resistance in wet oxygen, sulfurous acid, acetic acid, formic acid, and strong oxidizing salts, making them widely used in the chemical industry. Their electrical and thermal conductivities are much lower than those of low carbon steel, but their electrical resistivity and expansion rates are significantly higher. Hastelloy primarily includes nickel-molybdenum-based Hastelloy B-2 and nickel-chromium-molybdenum-based Hastelloy C-4..

Hastelloy alloys exhibit high strength and toughness, but their work hardening tendency makes machining challenging. At a 15% deformation rate, work hardening is about twice that of 18-8 stainless steel. Hastelloy is also prone to sensitization in a medium temperature range, increasing with deformation. At high temperatures, it can absorb harmful elements, reducing its mechanical and corrosion resistance properties.

Hastelloy alloys are renowned for their exceptional oxidation and corrosion resistance, particularly in high-temperature oxidizing environments. They resist corrosion from sulfurous acid, acetic acid, formic acid, and strong oxidizing salts, making them ideal for the chemical industry. Additionally, Hastelloy alloys maintain good corrosion resistance in the weld heat-affected zone, ensuring reliability in welding applications..
See : Haynes International HASTELLOY® C-22® Rods

Thanks to its excellent high-temperature performance, oxidation resistance, and corrosion resistance, Hastelloy is ideal for demanding industrial applications, including agricultural chemical equipment, medical devices, and pharmaceutical production equipment. It remains stable in high-radiation and high-temperature environments, making it suitable for structural material in nuclear reactors.

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