INCOLOY 825 Seamless Pipe | Sulfur Compound Solution
Incoloy seamless pipe with 42% Fe-Ni-Cr composition combats sulfuric acid stress cracking. Features Ti-stabilized design for refinery burner pipes handling 550°C exhaust gases. Discover our incoloy 825 seamless pipe options for reliable performance.
| Technical Specifications | |
| Sulfuric Acid Resistance | Up to 40% @65°C |
| Heat Treatment | Annealed at 980°C |
| Weldability | ENiCrMo-3 filler |
| PMI Testing | XRF on every pipe |
| Package | Nitrogen purged |
INCOLOY 825 (UNS N08825) contains 38-46% nickel with copper addition (1.5-3.0%) for sulfuric acid resistance. Titanium stabilization (0.6-1.2%) prevents sensitization.
Stress Rupture: 100 MPa @700°C/10,000h
Yield Strength Retention: 220 MPa @550°C
Oxidation Rate: <0.5 mg/cm²/100h @900°C
Thermal Fatigue: 300+ cycles (20-800°C)
Continuous extrusion with multi-stage cold drawing. Solution annealing at 980°C. 100% rotary ultrasonic testing to ASTM E213 Level B.
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API 934-C • NACE TM0177-2016 • SHELL MESC SPE 87/102
What is Incoloy 825 material?
Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, designed for exceptional resistance to acids and corrosion in harsh environments. It performs particularly well in sulfuric acid, phosphoric acid, and seawater applications, making it widely used in chemical processing, oil & gas, and marine engineering. In industrial piping systems, incoloy 825 seamless pipe is highly valued for its ability to maintain structural integrity under both oxidizing and reducing conditions. Its excellent weldability and durability make it a reliable choice for long-term corrosive service.
Are Inconel and stainless steel the same?
No, Inconel and stainless steel are fundamentally different materials. Inconel is a nickel-based superalloy designed for extreme heat and corrosion resistance, while stainless steel is primarily iron-based with chromium for general corrosion resistance. Compared to stainless steel, Inconel performs significantly better in high-temperature and highly corrosive environments, such as aerospace engines and chemical reactors. In applications requiring advanced performance, materials like incoloy 825 seamless pipe are often selected instead of standard stainless steel due to their superior resistance profile.
What is the difference between Incoloy 825 and SS316L?
Incoloy 825 and SS316L differ in composition, corrosion resistance, and performance range. SS316L is a low-carbon stainless steel with good general corrosion resistance, commonly used in food processing and marine environments. In contrast, Incoloy 825 contains higher nickel and added copper, giving it superior resistance to strong acids like sulfuric and phosphoric acid. For aggressive chemical or high-corrosion environments, incoloy 825 seamless pipe is far more reliable than SS316L, especially where long-term durability is critical.
What are the main applications of Incoloy 825 seamless pipe?
Incoloy 825 seamless pipe is widely used in chemical processing plants, offshore oil & gas systems, pollution control equipment, and heat exchangers. Its ability to resist pitting, crevice corrosion, and stress corrosion cracking makes it ideal for harsh industrial environments. Because it is seamless, it provides enhanced pressure resistance and reliability in critical piping systems. This combination of strength and corrosion resistance makes it a preferred material for demanding engineering applications.
Why is Incoloy 825 preferred in acidic environments?
Incoloy 825 is specifically engineered to perform in highly acidic conditions due to its nickel-chromium-molybdenum-copper composition. It offers excellent resistance to both oxidizing and reducing acids, which is rare among standard alloys. When used in incoloy 825 seamless pipe form, it provides additional structural integrity for continuous exposure to corrosive media. This makes it a cost-effective long-term solution for chemical reactors, pickling systems, and acid production facilities.
Is Incoloy 825 better than stainless steel for industrial piping?
In many aggressive environments, yes—Incoloy 825 outperforms stainless steel due to its superior resistance to localized corrosion and chemical attack. While stainless steels like 316L are suitable for mild conditions, they may degrade faster in strong acid or chloride-rich environments. In contrast, incoloy 825 seamless pipe maintains stability under harsher conditions, reducing maintenance and replacement costs. This makes it a preferred choice for industries requiring high reliability and extended service life.
