The materials we supply undergo a comprehensive range of quality assurance procedures, including eddy current testing, hydrostatic testing, ultrasonic examination, and other essential NDT methods, along with detailed chemical and mechanical property evaluations. Each product is thoroughly inspected at multiple stages of manufacturing to ensure it is free from defects and suitable for demanding industrial applications. Our rigorous testing standards guarantee consistent quality and reliability. In addition, all products are manufactured in accordance with relevant industry norms and specifications, making them fully compliant and widely accepted in both domestic and international markets.
ALLOY 254 SHEETS AND PLATES EQUIVALENT GRADES
| Material # | UNS | Werkstoff Nr. | AFNOR | EN |
|---|---|---|---|---|
| 1.4547 | S31254 | 2378 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 |
SPECIFICATION OF SMO 254 SHEETS AND PLATES
| Standard | ASTM A240 / ASME SA240 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF SMO 254 SHEETS AND PLATES
| Grade | C | Mn | Si | S | Cu | Ni | Cr | P | Mo |
|---|---|---|---|---|---|---|---|---|---|
| SMO 254 | 0.02 max | 1 max | 0.8 max | 0.01 max | 0.5 – 1 | 17.5 – 18.5 | 19.5 – 20.5 | 0.03 | 1 max |
MECHANICAL PROPERTIES OF SMO 254 SHEETS AND PLATES
| Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|---|
| 8.0 g/cm3 | 1320-1390 °C | MPa – 650 | MPa – 300 | 35 % |
💡 Practical Difference in Use
Use SMO 254 when: extreme corrosion resistance, especially against chlorides, seawater, and harsh chemicals, is the primary requirement.
→ Example: desalination plants, offshore equipment, heat exchangers, marine piping, chemical storage tanks, and pollution control systems.
Use Duplex/Super Duplex Stainless Steel when: higher strength and moderate corrosion resistance are needed at a more economical cost.
→ Example: structural components, moderate chloride environments, and applications requiring stronger load-bearing capabilities.
Use High-Alloy Austenitic Alternatives (Alloy 20 / 904L) when: specific chemical resistance is required for acids such as sulfuric or phosphoric acid.
→ Example: chemical processing equipment, pharmaceuticals, and environments where SMO 254 may be over-specified.
Applications of SMO 254 Sheets & Plates
SMO 254 (UNS S31254) is a super austenitic stainless steel designed for superior corrosion resistance in aggressive chloride-rich and marine environments. Its high molybdenum content (6%) and nitrogen addition provide exceptional pitting, crevice corrosion, and stress corrosion cracking resistance, making it a preferred choice for demanding industrial and marine applications.
- Marine & Offshore: Seawater piping, marine equipment, desalination plants, offshore oil & gas structures.
- Chemical Processing: Reactors, heat exchangers, storage tanks, acidic pipelines, evaporators.
- Industrial Systems: Pulp & paper bleaching equipment, pollution control units, power plant condensers.
When to Choose SMO 254?
Your choice depends on corrosion severity, chemical exposure, temperature resistance, and mechanical strength requirements.
Choose SMO 254 when:
- Exposure to chlorides, seawater, and highly corrosive environments
- Resistance against pitting & crevice corrosion is critical
- Material will be used in high-temperature or high-salinity conditions
- Excellent weldability and formability are required for fabrication
- Applications include marine systems, desalination units, and chemical plants
Choose Duplex / Super Duplex when:
- Higher mechanical strength is needed at a lower cost
- Corrosion levels are moderate (not extreme like chloride-rich environments)
- Material is used structurally, such as in bridges or load-bearing parts
- Economic feasibility is a priority over premium corrosion resistance
- Suitable for moderately corrosive industrial applications
Choose Alloy 20 / 904L when:
- High resistance to sulfuric or phosphoric acid is required
- Application involves specific chemical processing or acidic solutions
- Material must perform in low–moderate chloride environments
- Long-term resistance to chemical attack is essential
- Suitable for pharmaceuticals, refineries, and chemical reactors
Industries That Use SMO 254 Sheets & Plates
SMO 254 is widely used in industries where aggressive chemicals, chloride-rich environments, and high service durability are required.
The most reliable choice for seawater-contact components.
Uses
Seawater piping, splash zone equipment, offshore rigs, desalination plants.
Why SMO 254?
Exceptional chloride resistance and long-term durability in seawater environments.
Essential in handling strong acids, alkalis, and corrosive chemicals.
Uses
Reactors, heat exchangers, pressure vessels, chemical tanks.
Why SMO 254?
Unaffected by pitting, crevice attack, and stress corrosion cracking.
Ideal for equipment handling brackish, saline, and high-chloride water.
Uses
RO plants, evaporation units, brine heaters, seawater coolers.
Why SMO 254?
Designed to resist severe chloride-induced corrosion.
Withstands bleaching chemicals and acidic processing environments.
Uses
Bleaching plant equipment, digesters, evaporators.
Why SMO 254?
High resistance to acidic and chloride-based solutions.
Used where corrosion, heat, and chemical exposure occur simultaneously.
Uses
Condensers, flue-gas cleaning units, cooling systems.
Why SMO 254?
Performs reliably in high-temperature and chemically aggressive setups.
Chosen for environments where hygiene and corrosion control are essential.
Uses
Processing vessels, clean-in-place systems, sterile equipment.
Material Selection
SMO 254 offers superior cleanliness and corrosion performance compared to standard stainless steels.
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