Hastelloy C-276 is widely considered the "gold standard" of corrosion-resistant nickel alloys. It is a nickel-molybdenum-chromium superalloy with an addition of tungsten, specifically designed to withstand the most aggressive chemical environments known to man. It is one of the few materials that can survive in wet chlorine gas, hypochlorite, and chlorine dioxide.

Hastelloy C-22 is a versatile nickel-chromium-molybdenum-tungsten superalloy that offers even better overall corrosion resistance than its predecessor, C-276. It is specifically engineered to resist a broader range of aggressive chemicals, particularly providing superior protection in oxidizing acid environments.

Hastelloy X is a nickel-chromium-iron-molybdenum superalloy specifically engineered for high-temperature structural integrity and exceptional oxidation resistance. Unlike the "C" series Hastelloys, which focus on chemical acid resistance, Hastelloy X is the industry standard for gas turbine engines and aerospace components that must operate at temperatures up to 1200°C (2200°F).

Monel 400 is a high-performance nickel-copper alloy (approximately 67% Nickel and 23% Copper) that is world-renowned for its exceptional resistance to seawater and hydrofluoric acid. It is a "solid-solution" alloy, meaning it can only be hardened by cold working, and it maintains its high strength and toughness across a massive temperature range—from sub-zero cryogenic levels up to 450°C.

Monel K-500 is a unique nickel-copper alloy that combines the excellent corrosion resistance of Monel 400 with the added advantages of greater strength and hardness. This is achieved by adding aluminum and titanium to the nickel-copper base, followed by a thermal processing cycle called precipitation hardening (age hardening).

Inconel 600 is a versatile nickel-chromium alloy designed for use in environments ranging from cryogenic temperatures to extreme heat up to 1095°C (2000°F). Because of its high nickel content, it is exceptionally resistant to chloride-ion stress-corrosion cracking and provides excellent resistance to dry gases like chloride and hydrogen chloride.

Inconel 625 is a high-performance nickel-chromium-molybdenum alloy known for its tremendous strength and outstanding resistance to a vast range of severely corrosive environments. Unlike Inconel 600, which relies primarily on chromium for protection, Inconel 625 is "fortified" with molybdenum and niobium. These elements stiffen the alloy’s matrix, providing high strength without the need for a specific hardening heat treatment.

Incoloy 800 is a nickel-iron-chromium alloy specifically engineered for high-temperature structural applications. It is part of a family of alloys (including 800H and 800HT) designed to provide a stable, austenitic structure that resists oxidation, carburization, and nitridation. While it has a lower nickel content than the Inconel series, it offers a more economical solution for high-heat environments where moderate strength is required.

Nickel 200 is commercially pure wrought nickel (typically 99.6% nickel content). It is the most fundamental of the nickel alloys, valued for its exceptional resistance to a wide range of corrosive chemicals—particularly caustic alkalis. Because it is a single-phase metal, its properties are consistent and predictable, making it a reliable choice for high-purity chemical processing.

Chemical Composition: Ni (balance), Cr (14.5-16.5%), Mo (15-17%), W (3-4.5%), Fe (4-7%), with trace elements (C ≤0.01%, S ≤0.03%, etc.).
Applications:
Chemical/petrochemical equipment (reactors, heat exchangers) for handling acids, chlorides, and harsh fluids.
Environmental systems (flue-gas desulfurization, wastewater treatment).
Welded components (pressure vessels, agitators) due to good weldability.

Chemical Composition: Nickel (Ni, balance), Chromium (Cr, 20-22%), Molybdenum (Mo, 12-14%), Tungsten (W, 2.5-3.5%), Iron (Fe, 2-6%), with low traces of C (≤0.015%), Si (≤0.08%), S (≤0.02%).
Applications:
Chemical processing (reactors, pipelines) for harsh chemicals.
Pharmaceutical and food processing equipment.
Wastewater treatment and flue-gas desulfurization systems.
Marine and offshore components exposed to aggressive fluids.

Chemical Composition: Nickel (Ni, 47-50%), Chromium (Cr, 20.5-23.5%), Iron (Fe, 17-20%), Molybdenum (Mo, 8-10%), Cobalt (Co, 0.5-2.5%), with traces of C (≤0.10%), Mn (≤1.0%), Si (≤1.0%).
Applications:
Gas turbine components (combustors, transition ducts).
Furnace parts and heat-treating equipment.
Chemical processing for high-temperature reactions.
Aerospace and industrial heating systems.