UNS S34565 - EN 1.4162

S34565 is alean duplex stainless steel (LDSSS) withUNS (Unified Numbering System) designation. It is also known as 1.4162 or Ferralium 255 in some specifications. This stainless steel grade offers a good balance of properties, including high corrosion resistance, strength, and weldability.

National rules model：

Unified Numbering System (UNS): S34565

European Norm (EN): 1.4162 / X2CrNiNb18-10

ASTM: ASTM A240 / A240M S34565

Chemical Composition:

Chromium (Cr): 18.0-20.0%

Nickel (Ni): 8.0-10.0%

Molybdenum (Mo): 2.0-3.0%

Nitrogen (N): 0.10-0.20%

Manganese (Mn): ≤2.0%

Silicon (Si): ≤1.0%

Phosphorus (P): ≤0.045%

Sulfur (S): ≤0.030%

Carbon (C): ≤0.030%

Columbium (Nb) / Niobium: 8.5 x (C+N) min.

Physical Properties:

Density: Approximately 7.9 g/cm³

Melting Point: Around 1390-1400°C

Coefficient of Thermal Expansion: 13.7 x 10⁻⁶ /°C (at room temperature)

Electrical Resistivity: 72.4 µΩ·m

Thermal Conductivity: 23.1 W/mK

Mechanical Properties:

Tensile Strength: 700-850 MPa

Yield Strength: 300-550 MPa depending on the heat treatment

Elongation: 20-30%

Hardness: Approximately HB 200-270 (Rockwell B scale)

Application Areas:

Marine Environments: Due to its high corrosion resistance, it's used for various applications in ships, off-shore platforms, and other marine structures that are exposed to saline conditions.

Chemical Processing: Ideal for handling aggressive chemicals in chemical and petrochemical plants, such as heat exchangers, valves, and pipelines.

Food Processing Industry: Used in processing equipment and containers that need to resist both wear and corrosive substances, such as fruit juice evaporators.

Power Generation: Employed in components that are exposed to high temperatures and corrosive conditions in power plants, including fossil fuel plants and nuclear reactors.

Pollution Control: Used in flue gas desulfurization systems and other air pollution control equipment.

Automotive and Aerospace: Due to its strength and light weight, it may be used in some automotive and aerospace applications.

General Engineering: Suitable for various general engineering purposes where a combination of good general corrosion resistance and high strength is required.

Please note that specific chemical compositions and mechanical properties can vary depending on the source and manufacturing process, so the information provided is intended for general guidance.

Common Surfaces

Stainless Steel Standards Comparison Table