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碳钢 Carbon Steel (e.g., AISI 4140, 4130) Cost-effective, high strength. Used in non-corrosive or mildly corrosive environments. Usually requires galvanizing or coating for corrosion protection. 不锈钢 Stainless Steel The most common material, offering a good balance of strength and excellent corrosion resistance. - 304不锈钢 - 304 SS General-purpose austenitic stainless, resistant to general corrosion. - 316不锈钢 - 316 SS Contains Molybdenum, offers better resistance to chloride pitting and crevice corrosion than 304. Suitable for a wider range of well conditions. - duplex 2205 - Duplex 2205 Duplex stainless steel, very high strength, excellent resistance to chloride stress cracking and corrosion. For severe environments (high Cl-, H₂S). Super Alloys For extremely corrosive environments (high temperature, high concentrations of H₂S and CO₂). Hastelloy (e.g., C-276) Resistant to a wide range of severe corrosive media. Very expensive. Incoloy (e.g., 825) Resistant to stress corrosion cracking and reducing media. Galvanized Carbon Steel Zinc-coated carbon steel wire. Provides cost-effective corrosion protection for water wells and mild environments.

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