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254SMO (UNS S31254) Super Austenitic Stainless Steel Rectangular Pipe
Category: Super Austenitic Stainless Steel Pipes / High-Performance Structural Pipes
Product Overview:
Engineered for the most aggressive corrosive environments, our 254SMO (UNS S31254 / EN 1.4547) Super Austenitic Stainless Steel Rectangular Pipes are manufactured from premium 6-molybdenum alloy steel. Featuring an exceptional alloy composition of 20% Chromium, 18% Nickel, and 6% Molybdenum, combined with nitrogen strengthening, these pipes offer unparalleled resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. With a Pitting Resistance Equivalent Number (PREN) exceeding 43, they significantly outperform standard 316L and 904L stainless steels, making them the ideal structural and piping solution for marine engineering, flue gas desulfurization (FGD) systems, and high-concentration chloride processing plants.
Engineered for the most aggressive corrosive environments, our 254SMO (UNS S31254 / EN 1.4547) Super Austenitic Stainless Steel Rectangular Pipes are manufactured from premium 6-molybdenum alloy steel. Featuring an exceptional alloy composition of 20% Chromium, 18% Nickel, and 6% Molybdenum, combined with nitrogen strengthening, these pipes offer unparalleled resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. With a Pitting Resistance Equivalent Number (PREN) exceeding 43, they significantly outperform standard 316L and 904L stainless steels, making them the ideal structural and piping solution for marine engineering, flue gas desulfurization (FGD) systems, and high-concentration chloride processing plants.
Key Features:
- Extreme Corrosion Resistance: The high molybdenum (6.0-6.5%) and nitrogen content provide superior protection against seawater, halide media, and acidic environments, with a critical pitting temperature exceeding 70℃ in standard tests.
- High Mechanical Strength: Nitrogen solid-solution strengthening delivers a minimum tensile strength of 650 MPa and yield strength of 300 MPa, nearly double that of standard austenitic stainless steels, allowing for lighter yet stronger structural designs.
- Excellent Weldability & Fabrication: Low carbon content (≤0.02%) minimizes the risk of intergranular corrosion after welding. The pipes can be readily welded using standard TIG/MIG methods with ERNiCrMo-3 filler metals.
- Wide Temperature Range: Suitable for extreme conditions, maintaining stable mechanical and corrosion-resistant performance from cryogenic temperatures (-196℃) up to 400℃.
- Customizable Dimensions: Available in various rectangular profiles with customizable side lengths and wall thicknesses to meet specific structural and flow requirements.
Applications:
Widely used in seawater desalination plants, marine hydraulic piping, flue gas desulfurization (FGD) absorption towers, chemical reactors handling chlorides, pulp and paper bleaching equipment, and high-salinity wastewater treatment systems.
Widely used in seawater desalination plants, marine hydraulic piping, flue gas desulfurization (FGD) absorption towers, chemical reactors handling chlorides, pulp and paper bleaching equipment, and high-salinity wastewater treatment systems.
Why Choose Our 254SMO Pipes?
- Unbeatable Durability: With a PREN value ≥43, it resists seawater and acidic chlorides far better than 316L or 904L, extending equipment service life significantly.
- Superior Strength: High nitrogen content provides exceptional tensile and yield strength without compromising toughness, ideal for heavy-duty structural applications.
- Cost-Effective Alternative: Offers corrosion performance comparable to high-end nickel alloys and titanium, but at a much more competitive price point.
- Versatile Profiles: Available in rectangular shapes, perfect for both fluid transport and structural support frames in demanding industrial settings.
Technical Specifications (Customizable):
- Material: 254SMO / UNS S31254 / EN 1.4547 / 00Cr20Ni18Mo6CuN
- Product Type: Rectangular Pipe (Seamless or Welded)
- Size Range: Customizable side lengths and wall thicknesses
- Chemical Composition: Cr: 19.5-20.5%, Ni: 17.5-18.5%, Mo: 6.0-6.5%, N: 0.18-0.22%
- Mechanical Properties: Tensile Strength ≥650 MPa, Yield Strength ≥300 MPa, Elongation ≥35%
- Surface Finish: Pickled, Polished, or as required
- Standard: ASTM A240, A312, EN 10088