NACE Compliant IBR Approved Corrosion Resistant Alloy 825 Forged Steel Flanges

Alloy 825 (also known as Alloy825, Incoloy 825, or UNS N08825) is a nickel-iron-chromium alloy engineered for exceptional corrosion resistance in both reducing and oxidizing environments, including acids, chlorides, and sour service applications.

• Nickel (High Content): Provides comprehensive corrosion resistance and toughness, essential for stress corrosion cracking resistance in chloride and caustic environments.
• Chromium: Primary element for resistance to oxidizing environments, forming a stable passive film that protects against oxidizing acids and hot aerated media.
• Molybdenum and Copper: Enhance resistance to reducing environments such as sulfuric and phosphoric acids, providing protection against pitting and crevice corrosion in chloride-bearing solutions.
• Titanium (with Controlled Carbon): Stabilizes the alloy against sensitization by preventing carbide precipitation at grain boundaries, maintaining intergranular corrosion resistance after welding or heating.
• Low Carbon, Low Sulfur, Controlled Mn/Si: Low carbon limits carbide precipitation, low sulfur prevents hot cracking and improves corrosion resistance, while controlled manganese and silicon aid deoxidation and processing without negatively affecting corrosion properties.