2205 Duplex Stainless Steel Plate Technical Manual

2205 duplex stainless steel plate is a high-performance material with a balanced microstructure of austenite and ferrite phases (approximately 50:50 ratio). It exhibits exceptional corrosion resistance, superior mechanical strength, and excellent weldability. Key features include:

Corrosion Resistance: Outstanding resistance to chloride-induced stress corrosion cracking, pitting, and crevice corrosion (PREN value ≥35).
High Strength: Yield strength (≥450 MPa) and tensile strength (≥620 MPa) significantly exceed standard austenitic grades like 304.
Temperature Resistance: Stable performance in environments ranging from -50°C to 300°C.
Cost-Effective: Lower alloy content than nickel-based alternatives, reducing material costs.

Chemical Composition (wt%)

Element	Content (%)
C	≤0.030
Si	≤1.00
Mn	≤2.00
P	≤0.030
S	≤0.020
Cr	21.0–23.0
Ni	4.5–6.5
Mo	2.5–3.5
N	0.08–0.20
Compliance with ASTM A240/ASME SA240 standard.

Parameter	Value
Thickness Range	0.5mm–100mm
Width	1000mm–2500mm
Length	2000mm–12000mm
Density	7.8 g/cm³
Hardness (HB)	≤290
Yield Strength	≥450 MPa
Tensile Strength	≥620 MPa

I. Performance Characteristics of 2205 Stainless Steel Plate

1. Duplex Structure Advantages

Composed of approximately 50% austenite and 50% ferrite, it combines the high toughness of austenite with the high strength of ferrite, with a tensile strength ≥620 MPa and a yield strength ≥450 MPa, significantly superior to 304/316 stainless steel.

2. Corrosion Resistance

High chromium (22%), molybdenum (3%), and nitrogen (0.15-0.20%) elements work synergistically to form a stable passive film, making it particularly resistant to chloride stress corrosion, pitting, and crevice corrosion. With a PREN value ≥35, it is suitable for high-chloride environments such as seawater.

3. Processing and Weldability

Although cold working requires controlled deformation and intermediate annealing, it can be joined using conventional welding processes, requiring appropriate welding consumables and controlled heat input.

II. Main Applications

1. Chemical and Petroleum

Used in high-pressure pipelines, heat exchangers, and reactors, it is resistant to acidic media (such as dilute sulfuric acid) and sulfur-containing oil and gas environments.

2. Marine Engineering
Offshore platforms, ship components, and seawater treatment systems, offering outstanding resistance to seawater corrosion.

3. Energy and Environmental Protection
Oil and gas field pipelines, flue gas desulfurization equipment, and sewage treatment tanks, meeting the dual challenges of high strength and corrosion.

4. Other Industries
Paper bleaching equipment, food processing storage tanks, and bridge structures, balancing hygiene and durability.