Its superior composition includes:
- Nickel (Ni): ≈20% (enhances corrosion resistance and stability)
- Chromium (Cr): ≈20% (provides excellent oxidation resistance and general corrosion protection)
- Molybdenum (Mo): ≈6.5% (significantly boosts resistance to pitting and crevice corrosion)
- Copper (Cu): Added to improve resistance to sulfuric acid and other reducing acids
- Nitrogen (N): Increases strength and corrosion resistance without raising carbon content
- Low Carbon (C): ≤0.02% (minimizes the risk of sensitization and intergranular corrosion)
Similar Grades:
- UNS S31254 (USA), 1.4547 (DIN/Europe), Alloy 254 (trade name)
Outstanding Performance Characteristics
Exceptional Corrosion Resistance:
- Superior to standard 300-series stainless steels, particularly in chloride-rich environments.
- High resistance to pitting and crevice corrosion, even in warm seawater and acidic media.
- Excellent performance in sulfuric, phosphoric, and hydrochloric acids, as well as chloride-induced SCC.
High Mechanical Strength:
- Tensile strength: typically ≥620 MPa (90 ksi)
- Yield strength: ≥450 MPa (65 ksi)
- Maintains mechanical properties at elevated temperatures, making it suitable for high-temperature applications.
Excellent Weldability & Fabricability:
- Easily welded using standard techniques such as TIG, MIG, and submerged arc welding.
- Good formability in both hot and cold conditions, allowing for the manufacture of complex shapes.
Production Techniques
254SMO round bars are meticulously produced through:
Melting & Casting:
- Employs advanced melting methods like vacuum induction melting (VIM) or electric arc melting (EAF) to ensure high purity.
- Continuous casting or ingot casting processes, followed by hot rolling to form initial billets.
Thermal Processing:
- Hot working at temperatures between 1000°C and 1200°C (1832°F to 2192°F) for shaping and sizing.
- Solution annealing at 1010°C to 1150°C (1850°F to 2102°F) followed by rapid cooling to optimize microstructure and corrosion resistance.
Finishing:
- Cold drawing, grinding, or polishing to achieve precise dimensions and desired surface finishes.
Wide Range of Applications
254SMO round bars are essential in:
- Chemical Processing: Reactors, heat exchangers, and storage tanks handling highly corrosive chemicals.
- Oil & Gas: Pipelines, valves, and downstream equipment in sour gas and high-temperature, high-pressure environments.
- Marine Engineering: Offshore platforms, seawater desalination plants, and other marine applications requiring extreme corrosion resistance.
- Power Generation: Flue gas desulfurization systems, nuclear reactor components, and other critical power plant infrastructure.
- Pharmaceutical & Biotech: Equipment for the production and storage of corrosive pharmaceuticals and biotechnological products.
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Certified suppliers offer 254SMO round bars in diameters ranging from 6mm to 300mm, complying with ASTM A240, ASME SA240, EN 10088-1, and other relevant standards.
