aisi 316 vs ss316：What's the Difference?

Feb 06, 2026

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When searching for AISI 316 vs SS316, many buyers, engineers, and procurement managers assume these are two different stainless steel grades.
In reality, this keyword confusion is extremely common in international stainless steel sourcing, especially for pipes, sheets, plates, coils, and fittings.

This article explains the real difference between AISI 316 and SS316, clarifies naming standards, and helps buyers avoid costly specification mistakes.

What Is AISI 316 Stainless Steel?

AISI 316 (also known as SUS316 or 0Cr17Ni12Mo2) is a molybdenum-containing austenitic stainless steel. Due to the addition of 2-3% molybdenum, its corrosion resistance, resistance to chloride pitting, and resistance to seawater corrosion are significantly superior to 304 stainless steel. This type of steel is often referred to as "marine grade" or "medical grade" stainless steel and is widely used in marine, chemical, pharmaceutical, and high-quality tableware applications.

What Does SS316 Mean?

SS316 (or 316 Stainless Steel) is a high-performance, austenitic stainless steel alloy containing chromium, nickel, and 2%–3% molybdenum. The molybdenum addition provides superior corrosion resistance against chlorides, acids, and marine environments compared to 304 stainless steel. Often called "marine grade," it is used for chemical processing, medical devices, and coastal infrastructure.

AISI 316 vs SS316: Are They the Same?

In fact, AISI 316 and SS 316 are essentially the same material, both representing the same grade of molybdenum-alloyed austenitic stainless steel. "AISI" refers to the American Iron and Steel Institute standard, while "SS" is a common abbreviation for stainless steel. These two terms are interchangeable and are used to identify this corrosion-resistant metal, often referred to as marine-grade stainless steel.

What is another name for AISI 316?

AISI 316 / AISI 316L, also known as "1.4401/1.4404" and "V4A", is a higher-quality alloy than AISI 304 (known as "1.4301" and "V2A"), with added molybdenum and increased chromium and nickel content.

SS316 vs SS316L chemical composition

Element	SUS316 / SS316 (%)	SS316L (%)
Chromium	16.0 – 18.0	16.0 – 18.0
Nickel	10.0 – 14.0	10.0 – 14.0
Molybdenum	2.0 – 3.0	2.0 – 3.0
Carbon	≤ 0.08	≤ 0.03 (low carbon)

Ss316 vs ss316I mechanical properties

Property	SUS316 / SS316	SS316L
Tensile Strength (Rm)	515 – 750 MPa	485 – 700 MPa
Yield Strength (Rp0.2)	≥ 205 MPa	≥ 170 MPa
Elongation	≥ 40%	≥ 45%
Hardness (HB)	≤ 217	≤ 217

What is AISI 316 used for?

Marine and Coastal Environments: Due to its excellent resistance to saltwater corrosion, it can be used for ship fittings, fasteners, railings, and docks.
Chemical and Pharmaceutical Industries: Used in processing equipment, piping, tanks, and vessels for handling corrosive, acidic, or high-chloride materials.
Food Processing and Brewing: Used in the manufacture of sanitary equipment such as storage tanks, piping, and food processing surfaces, due to its resistance to corrosion from food acids and cleaning agents.

Is SS316 suitable for marine use?

Yes, 316 stainless steel (SS316) is highly suitable and commonly referred to as "marine grade" stainless steel. Due to the addition of 2-3% molybdenum, it offers superior resistance to chloride pitting and corrosion from saltwater compared to 304, making it ideal for boat fittings, fasteners, and offshore structures.

Looking for SS316/SUS316 stainless steel for your marine, chemical, or industrial project?Contact GNEE today for free quotes, customized solutions, and professional support for all your stainless steel needs.