Both zirconium-coated autoclaves and Hastelloy autoclaves are high-end corrosion-resistant reaction equipment, but their material properties, applicable media, and economics differ significantly. The core of selection is whether the corrosion system is compatible.

The biggest advantage of zirconium-coated autoclaves lies in their outstanding corrosion resistance to strongly acidic environments, especially hydrochloric acid systems, often surpassing even stainless steel and most nickel-based alloys. They exhibit excellent stability in hydrochloric acid, some organic acids, and highly corrosive chlorination systems, while showing extremely low contamination from impurities. Therefore, they are widely used in high-purity chemicals, special inorganic salts, and some strong acid processes. However, zirconium is difficult and expensive to process, and requires more stringent design and welding techniques.

Hastelloy autoclaves (such as C276 and C22) are corrosion-resistant materials with a wider range of applications, particularly adept at handling strong oxidizing acids, mixed acid systems, and complex corrosive environments containing chlorine. It can withstand various acidic media such as hydrochloric acid, sulfuric acid, and nitric acid, and effectively resists pitting corrosion, crevice corrosion, and stress corrosion. Therefore, it is more widely used in pharmaceutical intermediates, electronic chemicals, fine chemicals, and high-end hydrogenation/oxidation reaction systems.

From an application perspective, zirconium materials are more suited to "specialized solutions for hydrochloric acid and strongly reducing acid systems," while Hastelloy is more like a "general-purpose high-end solution for complex multi-acid systems."

From a cost and application breadth perspective, zirconium materials are generally more "specialized and expensive," with a narrower range of applications but are irreplaceable in specific systems; Hastelloy has a wider range of applications, but it may not be the optimal choice in extremely pure hydrochloric acid systems.

In short: For hydrochloric acid and strongly corrosive single-acid systems → zirconium materials are preferred; For mixed acid, chlorine-containing, complex high-end chemical systems → Hastelloy is preferred.