What is the difference between Inconel 625 and SS 316?

What is Inconel 625 material?

Inconel 625 is a nickel-chromium-molybdenum alloy with high strength, excellent corrosion and oxidation resistance, and good machinability. Because it can withstand harsh environments ranging from low temperatures to 1200°F (approximately 654°C) and even higher, it is widely used in demanding fields such as aerospace, chemical engineering, and marine engineering.

 

What material is 316 SS?

316 SS is an austenitic chromium-nickel stainless steel that includes molybdenum, which enhances its corrosion resistance, especially against chlorides and acidic compounds. It is a durable and non-magnetic alloy used in applications requiring high corrosion resistance, such as marine environments, medical implants, and chemical processing equipment.

 

 

Feature	Inconel 625	Stainless Steel 316
Type	Nickel-Chromium-Molybdenum Alloy	Austenitic Stainless Steel
Primary Use	Extreme temperature, high corrosion, chemical environments	General corrosion, chemical processing, marine applications
Cost	Higher (premium alloy)	Moderate
Temperature Resistance	Up to 980–1,100°C	Up to 870°C (short-term)

 

Chemical Composition

Element	Inconel 625	SS 316
Ni	58% min	10–14%
Cr	20–23%	16–18%
Mo	8–10%	2–3%
Fe	Balance	Balance
C	0.10% max	0.03% max
Mn	1% max	2% max
P	0.015% max	0.045% max
S	0.015% max	0.03% max

 

Mechanical Properties

Property	Inconel 625	SS 316
Tensile Strength	690–930 MPa	485–690 MPa
Yield Strength	275–550 MPa	205–290 MPa
Elongation	30–45%	40–60%
Hardness	180–230 HB	150–200 HB

 

Inconel 625 vs. SS 316: High Temperature Strength

Compared to SS 316, Inconel 625 exhibits significantly superior high temperature strength, maintaining its strength at temperatures up to 1000°C (1832°F), while SS 316 typically only reaches approximately 870°C (1600°F) during intermittent use. This makes Inconel 625 ideal for extreme high-temperature applications such as aerospace and gas turbines, where SS 316 would lose strength and be more prone to oxidation.

 

Inconel 625 vs. 316: Corrosion Resistance

Inconel 625 offers excellent corrosion resistance, particularly in corrosive environments such as high chloride, seawater, and high temperatures. 316 stainless steel, on the other hand, is suitable for general applications and mildly corrosive environments.

 

Inconel 625 vs. 316 Stainless Steel: Strength

Inconel 625 is significantly stronger than 316 stainless steel, especially at high temperatures. While both are strong, Inconel 625 has higher yield strength and tensile strength, maintaining its strength at extreme temperatures, while 316 stainless steel has lower strength and temperature limits.

 

If you are looking for high-quality Inconel 625 or 316 stainless steel sheets, pipes, bars, or fittings, GNEE offers a full range of high-quality certified products for chemical, petrochemical, marine, and high-temperature industrial applications. All products are ASTM, ASME, EN, and ISO certified, including factory test certificates (EN 10204 3.1/3.2), ensuring quality, traceability, and reliability.