What is 1.4466 Stainless Steel?
Jan 29, 2026
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1.4466 stainless steel, commonly known as Lean Duplex 2202 or UNS S32202, is a lean duplex stainless steel with a balanced ferritic-austenitic microstructure. It offers a cost-effective alternative to standard duplex grades, providing higher strength than austenitic steels and good resistance to stress corrosion cracking, making it suitable for structural, chemical, and water treatment applications.
This economical duplex grade is standardized under key international designations.
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | 1.4466 |
| ASTM/AISI (USA) | Lean Duplex 2202, UNS S32202 |
| Common Name | Lean Duplex 2202 |
Its lower alloy content compared to standard duplex grades reduces cost while maintaining useful properties.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| Content (%) | ≤ 0.03 | ≤ 1.0 | ≤ 2.0 | ≤ 0.035 | ≤ 0.01 | 21.5 - 24.0 | 1.0 - 3.0 | 0.10 - 0.80 | 0.10 - 0.22 |
It offers higher strength than austenitic grades with moderate corrosion resistance.
| Property | Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A) | Hardness (HB) |
|---|---|---|---|---|
| Typical Value | ≥ 450 MPa | 640 - 880 MPa | ≥ 25% | ≤ 290 |
Key Characteristics and Applications of 1.4466 / Lean Duplex 2202
High Strength and Good Toughness: Provides approximately double the yield strength of 304 stainless steel, allowing for weight and cost savings in structural designs.
Good Resistance to Stress Corrosion Cracking (SCC): Performs well in chloride-containing environments where austenitic grades may be susceptible to SCC.
Cost-Effective: Lower nickel and molybdenum content makes it more affordable than standard duplex grades like 2205.
Primary Applications:
Structural and Architectural: Bridges, façades, and reinforcement bars in aggressive atmospheres.
Water Treatment: Tanks, piping, and components in desalination and wastewater plants.
Chemical Processing: Equipment for mild to moderate corrosive media.
Oil & Gas: Piping and tanks in less aggressive sour service.
How does Lean Duplex 2202 (1.4466) compare to 304L (1.4307)?
Lean Duplex 2202 offers significantly higher yield strength (about twice that of 304L) and better resistance to stress corrosion cracking in chloride environments. While 304L may have slightly better general corrosion resistance in some acidic environments, Lean Duplex 2202 provides a better strength-to-cost ratio and is often chosen for structural applications where weight savings and SCC resistance are important.
What are the welding considerations for Lean Duplex 2202 stainless steel?
Welding Lean Duplex 2202 requires maintaining a balanced microstructure. Use of matching or over-alloyed filler metals, control of heat input, and proper shielding gas (typically argon-based with nitrogen addition) are important. Post-weld cleaning is recommended to restore corrosion resistance. It is generally more weldable than standard duplex grades due to its lower alloy content.
Looking for a Reliable Supplier of 1.4466 / Lean Duplex 2202 Stainless Steel?
GNEE Steel supplies cost-effective Lean Duplex 2202 (1.4466) stainless steel in plate, bar, and pipe forms for structural and industrial applications. We provide full material certification and processing support. If you have any requirements, please feel free to contact us.
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