1. What are the main chemical compositions of Hastelloy C22/C276 and Inconel 625/600/718?
Answer:
Hastelloy C22: Nickel (~56%), Chromium (~20%), Molybdenum (~12%), Tungsten (~3%), Iron (~2%), minor Cobalt and Manganese. Excellent corrosion resistance in oxidizing and reducing environments.
Hastelloy C276: Nickel (~57%), Chromium (~16%), Molybdenum (~16%), Iron (~5%), minor Tungsten. Highly resistant to pitting, stress corrosion cracking, and oxidizing/reducing acids.
Inconel 625: Nickel (~58%), Chromium (~21%), Molybdenum (~9%), Niobium (~3.6%), Iron (~5%). High strength and oxidation resistance.
Inconel 600: Nickel (~72%), Chromium (~15%), Iron (~8%). Good corrosion and high-temperature oxidation resistance.
Inconel 718: Nickel (~53%), Chromium (~19%), Iron (~18%), Niobium (~5%), Molybdenum (~3%), Titanium (~1%). Exceptional high-temperature strength.
2. What are the typical applications for these nickel alloy pipes?
Answer:
Hastelloy C22/C276: Chemical processing, acid handling, seawater equipment, pollution control systems, and pharmaceutical industries.
Inconel 625/600/718: Aerospace, power generation, chemical and petrochemical plants, heat exchangers, furnace components, and marine applications.
3. What temperature ranges can these alloys safely operate in?
Answer:
Hastelloy C22/C276: Up to ~450–500°C continuously, suitable for highly corrosive environments.
Inconel 625: Up to ~982°C (1800°F) with excellent oxidation and creep resistance.
Inconel 600: Up to ~1093°C (2000°F) in oxidizing environments.
Inconel 718: Up to ~700°C (1292°F), with superior mechanical strength at elevated temperatures.
4. How do these alloys resist corrosion?
Answer:
Hastelloy C22/C276: Excellent resistance to oxidizing and reducing acids, chloride-induced pitting, and stress corrosion cracking.
Inconel 625/600/718: Highly resistant to oxidation, general corrosion, and chloride stress corrosion cracking. Inconel 625 and 718 are also resistant to high-temperature oxidation and carburization.
5. What are the available forms and specifications for these pipes?
Answer:
Forms: Seamless and welded tubes/pipes, as well as custom OEM designs.
Sizes: Standard diameters range from 1/2" to 24" (DN 15–DN 600), with wall thicknesses per ASTM B622, B163, B167 standards.
Processing: Available in hot-rolled, cold-rolled, annealed, or solution-treated conditions. Can be cut, beveled, or supplied in coils per customer requirement.
