A240/SUS UNS S31803, commonly known as duplex stainless steel, is a versatile and corrosion-resistant material renowned for its dual-phase microstructure. It offers excellent strength, toughness, and resistance to corrosion in various environments, making it suitable for a wide range of applications.

Physical Properties:

A240/SUS UNS S31803 duplex stainless steel plate exhibits a density of approximately 7.8 g/cm³, providing superior strength while maintaining a relatively lightweight profile. It has a melting point of around 1400-1450°C and a thermal conductivity of approximately 19.0 W/m·K.

Size Range:

Available in a comprehensive range of sizes and thicknesses, A240/SUS UNS S31803 duplex stainless steel plate typically ranges from 0.3 mm to 100 mm in thickness. Widths can extend up to 2500 mm, and lengths can reach up to 12000 mm, catering to diverse application requirements.

Chemical Composition:

The typical chemical composition of A240/SUS UNS S31803 duplex stainless steel plate includes:

- Chromium (Cr): 21.0-23.0%

- Nickel (Ni): 4.5-6.5%

- Molybdenum (Mo): 2.5-3.5%

- Nitrogen (N): 0.08-0.20%

- Iron (Fe): Balance

- Other Elements: ≤2.5%

Mechanical Properties:

- Tensile Strength: ≥620 MPa

- Yield Strength: ≥450 MPa

- Elongation: ≥25%

These robust mechanical properties ensure exceptional performance in demanding applications.

Hardness:

A240/SUS UNS S31803 duplex stainless steel plate typically exhibits a Rockwell hardness of approximately C25.

Standard Compliance (ASTM A240, JIS G4304):

A240/SUS UNS S31803 duplex stainless steel plate complies with international standards such as ASTM A240 and JIS G4304, ensuring quality and consistency in production.

Non-Destructive Testing Standard:

Standard non-destructive testing methods, including ultrasonic inspection, are employed to ensure the quality and integrity of A240/SUS UNS S31803 duplex stainless steel plates.

Corrosion Resistance:

A240/SUS UNS S31803 duplex stainless steel offers superior corrosion resistance in various corrosive environments, including chloride-containing media such as seawater and brine solutions. It exhibits excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.

Heat Treatment Condition:

A240/SUS UNS S31803 duplex stainless steel plate is typically annealed at temperatures ranging from 1020 to 1100°C, followed by rapid cooling. This process helps improve its mechanical properties and corrosion resistance.

Main Applications:

- Oil and Gas Industry: Used in offshore platforms, pipelines, and subsea equipment.

- Chemical Processing: Employed in reactors, heat exchangers, and storage tanks.

- Marine Engineering: Found in shipbuilding, propeller shafts, and desalination plants.

- Power Generation: Utilized in nuclear power plants, steam turbines, and heat exchangers.

- Construction: Used in structural components, bridges, and architectural elements.

TJC Steel Supply Case:

TJC Steel (TJC Iron & Steel(Group) Co., Limited) is a leading supplier of A240/SUS UNS S31803 duplex stainless steel plates, adhering strictly to international standards like ASTM A240 and JIS G4304. They provide reliable solutions for various industries, ensuring the highest quality standards are met.