S31800 Stainless Steel Round Bar Diameter 10 - 350mm Cutting Solid Annealing

Products Specification

S31800 stainless steel introduction
S31800 stainless steel is a duplex stainless steel with excellent corrosion resistance and high strength. Its chemical composition is between austenite and ferrite, combining the advantages of both, and is widely used in chemical, petroleum, natural gas and other fields.

Main parameter of S31800 Stainless Steel
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

• 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)

Peculiarity of S31800 Stainless Steel

• Corrosion resistance: Excellent performance in chloride environment, strong resistance to pitting and crevice corrosion.
• High strength: The yield strength is twice that of ordinary austenitic stainless steel.
• Good weldability: can use a variety of welding methods, stable performance after welding.
• Stress corrosion cracking resistance: Excellent performance in chlorine-containing environments.
• Good processability: suitable for hot and cold processing and forming.

Our Main product of of S31800 Stainless Steel

• Sheet: Used for pressure vessels, storage tanks, etc.
• Pipe: Used for chemical and petroleum pipelines.
• Bars: Used to make mechanical parts.
• Forgings: for parts with high strength requirements.
• Welding material: Used for welding and repair.

Standard

• ASTM A240/A240M: Chromium and chromel stainless steel sheets, sheets and strips for pressure vessels and general purpose.
• ASTM A276/A276M: Stainless Steel bars and profiles.
• ASTM A312/A312M: Seamless, welded and cryogenically processed Austenitic stainless steel pipes.
• ASTM A182/A182M: Forged or rolled alloy and stainless steel pipe flanges, forged pipe fittings, valves, and parts for high temperature applications.

Apply of S31800 Stainless Steel

• Chemical industry: Used to manufacture reactors, heat exchangers, etc.
• Oil and gas: Used in subsea pipelines, drilling equipment, etc.
• Seawater treatment: Used in desalination equipment and pipelines.
• Pulp and paper: Used in bleaching equipment and storage tanks.
• Environmental protection project: Used for flue gas desulfurization equipment.

With its excellent corrosion resistance and high strength, S31800 stainless steel is widely used in many industrial fields, especially in harsh environments.