What is the difference between Incoloy 825 and SS316?
What is the difference between Incoloy 825 and SS316?
The main difference lies in their properties: Incoloy 825 is a nickel-based alloy with a high nickel content, thus exhibiting superior resistance to reducing acid corrosion and high-temperature corrosion; while SS316 is a chromium-based stainless steel that performs well in chloride environments. Incoloy 825 is more suitable for harsh environments such as those involving sulfuric acid and phosphoric acid, while SS316 is a common and economical choice for applications involving chlorides, such as marine and chemical industries.
Is Inconel 825 magnetic?
Inconel 825 is generally not magnetic. This alloy is a nickel-iron-chromium alloy with added molybdenum, copper, and titanium, elements that help improve its overall corrosion resistance and maintain its non-magnetic nature.
What is Incoloy 825?
Incoloy 825 is a nickel-iron-chromium alloy with added molybdenum, copper, and titanium. It exhibits extremely high corrosion resistance in reducing and oxidizing environments, particularly suitable for sulfuric acid, phosphoric acid, and acetic acid environments. Its excellent resistance to chloride stress cracking makes it ideal for marine applications.
What is SS316?
SS316 is a molybdenum-containing austenitic stainless steel; the addition of molybdenum enhances its corrosion resistance. It possesses excellent formability and weldability, making it suitable for a wide range of applications, from surgical instruments to chemical processing equipment. Its high nickel-chromium content provides it with exceptional corrosion resistance in acidic and chloride-rich environments.
Difference Between Incoloy 825 and SS 316
Chemical Composition Comparison
| Element | Incoloy 825 | 316L Stainless Steel |
|---|---|---|
| Nickel (Ni) | 38–46% | 10–14% |
| Chromium (Cr) | 19–23% | 16–18% |
| Iron (Fe) | ~22% | Balance (~65%) |
| Molybdenum (Mo) | 2.5–3.5% | 2–3% |
| Copper (Cu) | 1.5–3% | – |
| Titanium (Ti) | 0.6–1.2% | – |
| Carbon (C) | ≤0.05% | ≤0.03% |
Mechanical Properties Comparison
| Property | Incoloy 825 | 316L Stainless Steel |
|---|---|---|
| Tensile Strength (MPa) | ~550 | ~485 |
| Yield Strength (MPa) | ~220 | ~170 |
| Elongation (%) | 30–40 | 40 |
| Hardness (HB) | ~150 | ~150 |
Applications of Incoloy 825
Chemical processing equipment
Acidic solution heat exchangers
Marine and offshore pipeline systems
Pollution control equipment
Pickling tank heaters
Applications of 316L Stainless Steel
Marine structures and shipbuilding
Food and beverage processing
Pharmaceutical equipment
Heat exchangers for moderate environments
Building and structural components
Advantages of Incoloy 825
Excellent corrosion resistance, able to withstand a variety of corrosive environments
Higher mechanical strength than 316L
Stable microstructure after welding
Suitable for both oxidizing and reducing acids
Advantages of 316L Stainless Steel
Affordable and readily available
Excellent chloride resistance under moderate conditions
Easy to process and weld
Hygienic and aesthetically pleasing surface finish
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of incoloy 825 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with incoloy 825 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells incoloy 825, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
