UNS S32304, 2304, EN 1.4362, X2CrNiN23-4 Stainless Steel

UNS S32304 also known as (3204) is a dual-phase austenitic-ferritic stainless steel. It offers better corrosion resistance than 316L in many environments, yet has similar machinability to 316L and a reduced cost due to the much lower nickel and molybdenum levels. This could lead to the production of highly corrosion-resistant, lower-cost parts than can be attained by 316L.

Standard: ASTM A240/A240M, ASTM A480/480M
Grade: UNS S32304, 2304, EN 1.4362, X2CrNiN23-4

Density: 7.8 x 103 Kg/m3
Width: 1000mm, 1200mm, 1220mm, 1500mm, 1800mm, 2000mm, 2200mm
Length: 2438mm, 3000mm, 6000mm, 8000mm, 12000mm
Thickness: 0.3 – 50mm
Manufacturing Process: Hot Rolled/Cold Rolled
Surface finish: No.1, 2B

UNS S32304 is one of several Austenitic-Ferritic Stainless Steels, often known as duplex stainless steel which combines the many advantages of the other stainless steel groups. Duplex grades are generally higher strength and have better corrosion resistance. These alloys generally contain a 50-50 mix of austenite and ferrite, however, this can vary with different grads. The higher chromium content has a reduced scaling resistance than austenitic stainless steel. Plus, the duplex alloys possess increased stress corrosion cracking resistance as well as increased chlorine corrosion and intergranular corrosion resistance. Reduced wield sensitization is another advantage to these grades. These alloys are also interesting in that they contain lower amounts of nickel and can be attractive alternatives to the higher nickel stainless alloys.

UNS S32304 is considered a lean duplex alloy with high chromium, low nickel, and very little molybdenum contents.

UNS S32304 is a high-strength duplex grade at almost double that of an austenitic stainless and possesses good physical properties that can offer design advantages, ease of fabrication, and good weldability. Uniform corrosion resistance is very good along with resistance to pitting, crevice, and stress corrosion cracking.

Stress Relieving (Heat Treatment): 1750°F – 1925°F (940°C to 1050°C) followed by rapid quenching in water. Do not stress release between 570 – 1650°F (285°C – 885°C) to avoid sigma phase formation.


Pulp and paper industry, Desalination plants, Flue-gas cleaning, Cargo tanks, and pipe systems in chemical tankers, Seawater systems, Firewalls and blast walls on offshore platforms, Bridges, Components for structural design, Storage tanks, Pressure vessels, Heat exchangers, Water heaters, Rotors, impellers, and shafts.