Duplex Stainless Steel Round Bar UNS S31800 / 2205 /F60 Round Rod SA276

Products Specification

S31800 duplex stainless steel rod introduction
S31800 duplex stainless steel bar is a combination of austenitic and ferritic structure of stainless steel material, with high strength, excellent corrosion resistance and good welding properties. Widely used in chemical industry, oil, natural gas, seawater treatment and other fields.

Main parameter of S31800 Stainless Steel Bar
Chemical composition (typical value) :

• Carbon (C) : ≤ 0.03%
• Silicon (Si) : ≤ 1.00%
• Manganese (Mn) : ≤ 2.00%
• Phosphorus (P) : ≤ 0.030%
• Sulfur (S) : ≤ 0.020%
• Chromium (Cr) : 21.0-23.0%
• Nickel (Ni) : 4.5-6.5%
• Molybdenum (Mo) : 2.5-3.5%
• Nitrogen (N) : 0.08-0.20%

Mechanical properties of S31800 Stainless Steel Bar

• Tensile strength: ≥ 620 MPa
• Yield strength: ≥ 450 MPa
• Elongation: ≥ 25%
• Hardness: ≤ 290 HB
• Physical properties:
• Density: 7.8 g/cm³
• Melting point: 1420-1465 °C
• Coefficient of thermal expansion: 13.7 × 10⁻⁶ /K (20-100 °C)
• Thermal conductivity: 15 W/m·K (20 °C)

Specification of S31800 Stainless Steel Bar

• Diameter range: usually 5 mm to 300 mm (can be customized according to requirements).
• Length: Generally 3 meters to 6 meters, can also be customized according to customer requirements.
• Shape: round bar, square bar, hexagonal bar, etc.
• Surface treatment: black , polishing, etc.

Standard of S31800 Stainless Steel Bar

• ASTM A276/A276M: Standard Specification for Stainless Steel bars and profiles.
• ASTM A479/A479M: Stainless Steel bars and profiles for high-temperature equipment.
• EN 10088-3: European standard, Technical delivery conditions for stainless steel bars, wires and profiles.
• GB/T 1220: Chinese standard, technical conditions for stainless steel bars.

Peculiarity of S31800 Stainless Steel Bar

• High strength: The yield strength is twice that of ordinary austenitic stainless steel.
• Excellent corrosion resistance: Resistance to pitting, crevice corrosion and stress corrosion cracking in chloride environments.
• Good weldability: can use a variety of welding methods, stable performance after welding.
• Good processability: suitable for hot and cold processing and forming.
• Biphase structure: both the advantages of austenite and ferrite, excellent overall performance.

Advantage of S31800 Stainless Steel Bar

• Cost-effective: performs better than ordinary stainless steel in harsh environments, but costs less than high-nickel alloys.
• Long life: Corrosion resistance and high strength make it last longer in harsh environments.
• Versatility: suitable for a variety of processing methods and application scenarios.
• Environmental protection: Recyclable, in line with environmental requirements.

Apply of S31800 Stainless Steel Bar

• Chemical industry: Used to manufacture reactors, agitators, pump shafts, etc.
• Oil and gas: Used in drilling equipment, subsea pipelines, valves, etc.
• Seawater treatment: Used in desalination equipment, pump shafts and pipelines.
• Pulp and paper: Used in bleaching equipment, storage tanks and delivery systems.
• Environmental protection project: used for flue gas desulfurization equipment, waste water treatment equipment.
• Mechanical manufacturing: For high-strength parts, shafts and connectors.

S31800 duplex stainless steel rod with its high strength, excellent corrosion resistance and good processing properties, become the ideal material in chemical, oil, natural gas and other fields. Its biphase structure provides excellent overall performance and is suitable for a variety of application scenarios in harsh environments.

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