WHAT IS THE DIFFERENCE BETWEEN INCOLOY 825 AND SS316?
Incoloy 825 and SS316 are two widely used corrosion-resistant alloys in the chemical, petrochemical, marine, and industrial manufacturing industries. Although both materials provide excellent resistance to corrosion, there are significant differences in their chemical composition, mechanical properties, and industrial applications.
What is INCOLOY 825?
INCOLOY 825 is a nickel-iron-chromium alloy containing additions of molybdenum, copper, and titanium. These elements enhance its resistance to reducing and oxidizing environments, strong acids, and chloride-induced stress corrosion cracking. It is a **high-performance alloy** suitable for highly corrosive industrial conditions.
| Element | Typical Content (%) |
|---|---|
| Nickel (Ni) | 38–46 |
| Iron (Fe) | 38–46 |
| Chromium (Cr) | 19–23 |
| Molybdenum (Mo) | 2–3 |
| Copper (Cu) | 1–2 |
| Titanium (Ti) | ≤0.6 |
| Carbon (C) | ≤0.05 |
What is SS316?
SS316 is an austenitic stainless steel widely used for its excellent general corrosion resistance and good mechanical properties. It contains chromium, nickel, and molybdenum, but lacks the copper and titanium found in INCOLOY 825. SS316 is ideal for applications in moderate chloride environments, marine equipment, chemical tanks, and piping.
| Element | Typical Content (%) |
|---|---|
| Nickel (Ni) | 10–14 |
| Chromium (Cr) | 16–18 |
| Molybdenum (Mo) | 2–3 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤0.08 |
| Manganese (Mn) | ≤2.0 |
Key Differences Between INCOLOY 825 and SS316
| Feature | INCOLOY 825 | SS316 |
|---|---|---|
| Type | Nickel-Iron-Chromium Alloy | Austenitic Stainless Steel |
| Corrosion Resistance | Excellent in strong acids, reducing and oxidizing environments, and chlorides | Good general corrosion resistance, moderate chloride resistance |
| High Strength | High mechanical strength at elevated temperatures | Moderate strength |
| Special Elements | Copper, Titanium | None |
| Applications | Chemical processing, petrochemical, seawater equipment, heat exchangers | Marine, food, chemical tanks, piping, moderate corrosive environments |
| Cost | Higher due to alloying elements | Lower, commonly available |
Applications
- INCOLOY 825: chemical processing tanks, valves, heat exchangers, seawater components, petrochemical industry
- SS316: marine fittings, piping, chemical vessels, food processing equipment, general corrosion-resistant fabrication
Why Choose SASA ALLOY?
- Supply INCOLOY 825 and SS316 in bars, plates, sheets, pipes, and tubes
- EN 10204 3.1 material certificate and full traceability
- Chemical and mechanical testing, PMI testing, UT inspection available
- Custom sizes and specifications according to client requirements
- Global delivery for industrial and chemical projects
FAQ
Is INCOLOY 825 stronger than SS316?
Yes. INCOLOY 825 has higher mechanical strength and better corrosion resistance in strong acids and chlorides compared to SS316.
Can INCOLOY 825 and SS316 be welded?
Yes. Both alloys can be welded, but INCOLOY 825 requires careful welding procedure control due to higher alloying elements.
Which material is more cost-effective?
SS316 is more economical and widely available. INCOLOY 825 has higher cost due to its additional alloying elements and superior corrosion resistance.
Post time: May-29-2026