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In the stainless steel manufacturing industry, pickling tanks are essential for removing oxides and scale from steel surfaces. However, the harsh acidic environments used in this process present significant material challenges. Many common alloys fail due to corrosion from sulfuric acid or hydrochloric acid.
Alloy 20 (UNS N08020) is a nickel-chromium-iron alloy, primarily developed for highly corrosive acidic environments. Its resistance to both oxidizing and reducing acids makes it ideal for chemical tanks used in pickling, as well as in food processing, pharmaceutical, and paper industries.
Excellent resistance to sulfuric acid and chloride-induced stress corrosion cracking
High strength for structural integrity under load
Non-magnetic and weldable for ease of fabrication and repair
A steel mill in Ohio experienced repeated failures of pickling tanks made from 304L stainless steel.
Problems: Frequent acid corrosion, pitting, and leaks after 18 months of service
Solution: Replaced pickling tank internals with Alloy 20 bars for supports, baffles, and piping.
Reduced tank downtime by 50%
Extended service life by over 5 years, with minimal maintenance
Improved safety in the facility due to fewer leak-related incidents
Alloy 20 rods and bars provide exceptional protection in pickling tanks, offering a long-lasting, cost-efficient solution for corrosion problems in steel mills, chemical plants, and food processing industries.
