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N08120 (UNS N08120) seamless pipe and tube, conforming to ASTM B407, is a nickel-iron-chromium alloy designed for superior resistance to high-temperature oxidation and carburization. Comprising approximately 35% nickel, 45% iron, 22% chromium, and additions of molybdenum, copper, and niobium, this alloy balances strength, ductility, and corrosion resistance across a wide thermal spectrum. The seamless manufacturing process ensures consistent wall thickness and freedom from weld defects, critical for high-pressure and high-temperature services.
N08120 is often specified in applications where traditional stainless steels fall short, such as in reducing atmospheres or where exposure to sulfur-containing gases is prevalent. It adheres to strict quality standards, ensuring reliability in demanding industrial environments.
Exceptional High-Temperature Resistance: Maintains mechanical properties up to 1100°C, with excellent resistance to scaling and oxidation in both reducing and neutral atmospheres.
Corrosion Resistance: Resistant to sulfuric and phosphoric acids, chloride-induced pitting, and stress-corrosion cracking, making it suitable for chemical processing and fossil fuel applications.
Low Thermal Expansion: Offers a low coefficient of thermal expansion, reducing thermal stress in components subject to frequent temperature cycles.
Weldability & Formability: Can be welded using standard techniques with matching filler metals, and its ductility allows for cold forming into complex geometries.
Energy Production: Used in coal-fired power plant boilers, gas turbines, and waste-to-energy incinerators, where resistance to ash corrosion and high-temperature oxidation is critical.
Chemical Processing: Handles aggressive acids in fertilizer production, especially phosphoric acid plants, and sulfuric acid concentration units.
Heat Treatment Equipment: Ideal for furnace tubes, retorts, and radiant tubes in heat treatment facilities exposed to carburizing or nitriding atmospheres.
Petroleum Refining: Employed in reformers, heaters, and pipelines processing high-sulfur crude oil, resisting sulfidation and coking.
Q: How does N08120 perform in sulfuric acid environments?
A:It offers good resistance to sulfuric acid up to 60% concentration at temperatures below 80°C, with performance improving in reducing conditions.
Q: What is the primary advantage over 304 stainless steel in high-temperature use?
A:N08120 has superior oxidation resistance above 800°C and better resistance to sulfur-containing gases, which cause rapid degradation in 304.
Q: Can N08120 be used in cryogenic applications?
A:While it maintains ductility at low temperatures, it is not optimized for cryogenic use; nickel-rich alloys like Inconel 625 are more suitable for such environments.
Q: Does this alloy require pickling after welding?
A:Post-weld cleaning is recommended to remove heat-affected zone discoloration and ensure maximum corrosion resistance, though it is not as critical as with some other nickel alloys.
