1.4404 vs. 1.4462 stainless steel: what is the difference?

1.4404 vs. 1.4462 Stainless Steel: What Are the Differences?

When selecting stainless steel for industrial or structural applications, choosing between 1.4404 (AISI 316L) and 1.4462 (Duplex 2205) is a common challenge. Both offer excellent corrosion resistance, but they differ significantly in mechanical properties, structure, and ideal use cases. This comparison guide helps clarify their distinctions to support material selection decisions.

Overview of 1.4404 Stainless Steel (AISI 316L)

1.4404 stainless steel, also known as AISI 316L, is a molybdenum-alloyed austenitic stainless steel with low carbon content. It offers excellent corrosion resistance in chloride environments, great weldability, and is widely used in chemical processing, marine structures, and food-grade applications.

Key Features:

Austenitic structure (non-magnetic in annealed condition)

Excellent weldability with low risk of intergranular corrosion

Great resistance to pitting and crevice corrosion

Good surface finish and polishability

Overview of 1.4462 Stainless Steel (Duplex 2205)

1.4462, or Duplex 2205, is a duplex stainless steel composed of approximately equal parts of ferrite and austenite. This dual-phase microstructure gives it higher strength and better stress corrosion resistance than conventional austenitic steels.

Key Features:

Duplex structure (ferritic-austenitic, partially magnetic)

Twice the yield strength of 1.4404

Excellent resistance to chloride stress corrosion cracking

Good weldability, but requires more control than 316L

1.4404 vs. 1.4462: Comparison Table

Property	1.4404 (AISI 316L)	1.4462 (Duplex 2205)
Stainless steel type	Austenitic	Duplex (Austenitic + Ferritic)
Magnetic behavior	Non-magnetic	Slightly magnetic
Yield strength	≥ 190 MPa	≥ 450 MPa
Tensile strength	500–700 MPa	620–880 MPa
Elongation (A5)	≥ 40%	≥ 25%
Corrosion resistance	Excellent	Superior (especially in chlorides)
Resistance to SCC (Stress Corrosion Cracking)	Moderate	Excellent
Weldability	Very good	Good (requires more care)
Density	7.93 g/cm³	7.80 g/cm³
Applications	Chemical, marine, food industry	Offshore, pressure vessels, structural parts

difference between 1.4404 and 1.4462 Corrosion Resistance

1.4404 offers excellent general corrosion and pitting resistance thanks to its molybdenum content, but it may suffer from chloride-induced stress corrosion cracking in extreme conditions.

1.4462 duplex stainless steel provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in aggressive chloride environments like seawater or chemical plants.

Mechanical Strength: Duplex vs Austenitic Stainless Steel

1.4462 has roughly double the yield strength of 1.4404, making it ideal for high-load-bearing applications such as bridges, pressure vessels, and offshore structures.If formability or flexibility is more important than strength, 1.4404 is easier to bend and cold-work.

1.4404 vs 1.4462 stainless steel：Weldability and Fabrication

316L (1.4404) is preferred for complex weldments because of its low carbon content, which prevents carbide precipitation and intergranular corrosion.

1.4462 is weldable but requires careful heat input control and post-weld treatment to maintain its duplex structure and corrosion resistance.

Which One Should You Choose?

Choose 1.4404 stainless steel for:Medical, food-grade, and sanitary equipment,Marine hardware and pipelines,Easy welding and shaping requirements.

Choose 1.4462 duplex stainless steel for:High-stress or load-bearing environments,Offshore platforms and desalination plants,Environments with high chloride concentration