904L Acid Alkali / High Temperature Resistant Round Steel 1.4529 Stainless Steel Rod

904L (N08904, 14539) super austenitic stainless steel contains 14.0-18.0% chromium, 24.0-26.0% nickel, and 4.5% molybdenum. This low-carbon, high nickel, molybdenum austenitic stainless steel has excellent activation passivation transformation ability and corrosion resistance.

• Corrosion resistance: Excellent in non-oxidizing acids like sulfuric acid, acetic acid, formic acid, and phosphoric acid
• Pitting corrosion resistance: Performs well in neutral chloride ion media
• Resistance to crevice corrosion and stress corrosion: Suitable for harsh corrosive environments
• Density: 8.0 g/cm3
• Melting point: 1300-1390 ℃
• Tensile strength: σ b ≥ 520Mpa
• Elongation rate: δ ≥ 35%

The low carbon content (≤0.020%) prevents carbide precipitation during heat treatment and welding, eliminating intergranular corrosion risk. The high chromium-nickel-molybdenum content with copper addition enables passivation even in reducing environments like sulfuric and formic acids.

Operating temperature reaches 40°C in 0-98% sulfuric acid and shows excellent resistance in 0-85% phosphoric acid. While limited to 1-2% concentration in hydrochloric acid, it outperforms conventional stainless steels. The high nickel content reduces corrosion in pits/crevices and provides exceptional stress corrosion cracking resistance in chloride solutions, concentrated hydroxide, and hydrogen sulfide-rich environments.

• Petroleum and petrochemical equipment (reactors)
• Sulfuric acid storage/transport equipment (heat exchangers)
• Power plant flue gas desulfurization systems
• Organic acid treatment scrubbers and fans
• Seawater treatment equipment and heat exchangers
• Paper industry equipment
• Pharmaceutical equipment (centrifuges, reactors)
• Food processing equipment (soy sauce, cooking wine containers)
• Chemical processing pressure vessels