What is the difference between Inconel X750 and ss316?

What is the difference between Inconel X750 and ss316?

Inconel X750 vs SS 316 – 1. Composition
Inconel X750 is a nickel-chromium based alloy known for its high strength and excellent corrosion resistance. It typically contains high amounts of nickel, chromium, and titanium, along with smaller amounts of aluminum and iron. The addition of titanium in Inconel X750 helps stabilize the alloy against sensitization and intergranular corrosion.

SS 316, on the other hand, is a molybdenum-containing austenitic stainless steel. Its composition consists primarily of iron, chromium, nickel, and molybdenum. The molybdenum content gives SS 316 superior corrosion resistance, especially to chloride ions, than other stainless steel grades.

The key difference between Inconel X750 and SS 316 is their chemical composition, which directly affects their properties and performance.

Inconel X750:

Nickel (Ni): 70% (major element)

Chromium (Cr): 14-17%

Iron (Fe): 5-9%

Niobium (Nb): 0.7-1.2%

Titanium (Ti): 2.25-2.75%

Aluminum (Al): 0.4-1.0%

Other elements: Small amounts of Cobalt, Manganese and Copper.

Inconel X750 is a nickel-chromium high-temperature alloy with additions of Titanium and Aluminum to achieve high strength through precipitation hardening.

SS 316:

Iron (Fe): 60-65% (major element)

Chromium (Cr): 16-18%

Nickel (Ni): 10-14%

Molybdenum (Mo): 2-3%

Manganese (Mn): Up to 2%

Other elements: Small amounts of Silicon, Phosphorus, Sulfur and Carbon.

SS 316 is an austenitic stainless steel with molybdenum added to enhance its corrosion resistance, especially in chloride environments.

Inconel X750 vs SS 316 – 2. Mechanical Properties
Inconel X750 has high tensile strength and ductility, making it suitable for applications that require both strength and formability. It also maintains its mechanical properties at elevated temperatures, making it a top choice for high temperature applications.

SS 316, while not as strong as Inconel X750, still has good mechanical properties. It is tougher and more ductile than some other stainless steel grades, allowing it to be used in a wider range of applications. However, it may not be as strong and ductile as Inconel X750 under extreme conditions.

Inconel X750 vs SS 316 – 3. Corrosion Resistance
Both Inconel X750 and SS 316 are known for their excellent corrosion resistance. Inconel X750 owes its corrosion resistance to its nickel and chromium content, which form a protective oxide layer on the alloy surface. This oxide layer effectively resists attack by a wide range of corrosive agents, including acids, alkalis and salt water.

The corrosion resistance of SS 316 is enhanced by the addition of molybdenum, which significantly improves its resistance to chloride corrosion. This makes SS 316 particularly suitable for applications in marine environments and other chloride-rich conditions.