What is 1.4662 Stainless Steel?

1.4662 stainless steel, commonly known as 2001 or UNS S32001, is a lean duplex stainless steel designed to offer an optimal balance of high strength, good corrosion resistance, and excellent economy. With its ferritic-austenitic microstructure, it provides approximately twice the yield strength of conventional austenitic grades like 304L, while using significantly reduced nickel and molybdenum content through manganese and nitrogen alloying. This makes it an exceptionally cost-effective alternative for applications where the higher alloy content of standard duplex grades is not required.

 

This lean duplex grade is standardized under key international systems.

Standard	Equivalent Grade
EN (Europe)	1.4662
ASTM/AISI (USA)	2001, UNS S32001
Common Name	Lean Duplex 2001

Its composition is optimized with manganese and nitrogen to replace more expensive alloying elements.

Element	C	Si	Mn	P	S	Cr	Ni	Mo	N
Content (%)	≤ 0.03	≤ 1.0	4.5 - 6.5	≤ 0.04	≤ 0.03	19.5 - 21.5	1.0 - 2.0	0.1 - 0.6	0.10 - 0.20

It offers high strength with good toughness and corrosion resistance at an economical price point.

Property	Yield Strength (Rp0.2)	Tensile Strength (Rm)	Elongation (A)	Hardness (HB)	Impact (J)
Typical Value	≥ 450 MPa	650 - 850 MPa	≥ 30%	≤ 280	≥ 80 (20°C)

 

Key Characteristics and Applications of 1.4662 / 2001

High Strength: Offers approximately twice the yield strength of austenitic grades like 304L, enabling significant weight reduction and thinner sections in structural applications.

Excellent Economy: Very low nickel and molybdenum content, combined with manganese and nitrogen alloying, provides outstanding performance at a highly competitive and stable price point.

Good Corrosion Resistance: Provides corrosion resistance approaching that of 304L in many environments, with PREN typically 22-24. Good resistance to stress corrosion cracking due to duplex structure.

Good Weldability: Can be welded using common techniques without preheating, with good resistance to hydrogen-induced cracking.

 

Primary Applications:

Structural Engineering: Bridges, storage tanks, silos, and architectural structures requiring high strength and economy.

Transportation: Truck trailers, railway wagons, shipping containers, and vehicle frames.

Water Treatment: Tanks, piping, and components in water and wastewater treatment plants.

Food Processing: Equipment for food handling where economy and moderate corrosion resistance are important.

Mining and Mineral Processing: Screens, conveyors, and handling equipment.

Renewable Energy: Solar panel frames, support structures, and wind turbine components.

Architectural: Roofing, cladding, and structural supports in non-critical environments.

 

How does 2001 (1.4662) compare to 304L (1.4307)?
2001 offers approximately twice the yield strength of 304L (450 MPa vs. 200 MPa), enabling significant weight savings and thinner material sections. Its corrosion resistance is approaching that of 304L in many environments, with PREN 22-24 compared to 304L's 18-20, offering comparable or slightly better pitting resistance. It provides better resistance to stress corrosion cracking due to its duplex structure. 2001 is significantly more cost-effective and price-stable due to its very low nickel content. It is magnetic, while 304L is non-magnetic. However, 304L offers better formability for complex shapes and higher toughness at very low temperatures. 2001 is an excellent choice for structural applications where high strength and economy are primary drivers.

 

What are the welding considerations for 2001 (1.4662) stainless steel?
2001 has good weldability and can be welded using all common methods without preheating. Matching filler metals are available, though austenitic fillers (308L, 309L) may also be used for less demanding applications. The duplex structure provides good resistance to hot cracking. Recommended heat input is 0.5-2.5 kJ/mm, with interpass temperature below 150°C to avoid excessive ferrite formation. Shielding gas with nitrogen addition (typically Ar + 2% N2) helps maintain nitrogen content in the weld metal. The lean alloy content makes it more forgiving to weld than higher-alloyed duplex grades, with excellent as-welded properties without post-weld heat treatment. For optimum corrosion performance, matching filler metals are recommended.

 

Looking for a Reliable Supplier of 1.4662 / 2001 Stainless Steel?
GNEE Steel supplies cost-effective Lean Duplex 2001 (1.4662) stainless steel in plate, sheet, bar, pipe, and structural profiles for demanding applications where economy and performance are both important. We provide full material certification (EN 10204 3.1) and processing support including cutting, bending, forming, and welding services. If you have any requirements, please feel free to contact us.