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254SMO Stainless Steel Sheet Corrosion-Resistant, High-Strength Alloy Plate
| Τόπος καταγωγής | Κίνα |
|---|---|
| Μάρκα | BAOSTEEL TISCO |
| Πιστοποίηση | ISO |
| Αριθμό μοντέλου | 254SMO |
| Ποσότητα παραγγελίας min | 50 κιλά |
| Τιμή | 7 - 10 USD/Kg |
| Συσκευασία λεπτομέρειες | τυπική συσκευασία για εξαγωγή |
| Χρόνος παράδοσης | 5 - 12 ημέρες με βάση την ποσότητα |
| Όροι πληρωμής | L/C, T/T, Western Union |
| Δυνατότητα προσφοράς | 20ton την εβδομάδα |
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xΛεπτομέρειες
| Προϊόντα | φύλλα από ανοξείδωτο χάλυβα | Βαθμός | 254SMO |
|---|---|---|---|
| Πάχος | 1,0-80,0 χλστ | Τεχνολογικά | ψυχρής έλασης, θερμής έλασης, σφυρήλατο |
| Πλάτος | 1000mm 1219mm 1500mm ή τελωνείο ως αίτημα | Επιφάνεια | 2B BA No.1 |
| Πρότυπο | ASTM ΜΒ JIS EN DIN | MOQ | 1 τόνος |
Περιγραφή προϊόντων
254SMO Stainless Steel Sheet Corrosion-Resistant, High-Strength Alloy Plate
Stainless Steel Sheet Specifications
| Name | 254SMO stainless steel sheet |
| Our Grade |
200 Series: 201 202 300 Series: 301 304,304L,304H,309S,310S,314,316L,316Ti,316H,316LN,317L,321,329,347 400 Series: 409L,410,410S,416,420,430,431,436L.439,441,443,444,445,446 Super Stainless Steel: 904L,926,254SMO,654SMO,15-5PH,17-4PH,17-7PH.etc Nickel Alloy: C276, C22,G35,Alloy X,Monel 400,K500,Inconel 600,601,617,625,718,Incoloy 800,800H,800HT,825.etc |
| Technique | Hot Rolled, Cold Rolled,Forged |
| Standard | JIS, AISI, ASTM, DIN, TUV, BV, SUS, etc |
| Thickness | 0.1 – 80.0mm |
| Width range | 10mm – 2000mm |
| Length | Customized |
| Finish | 2B, BA, No.4, 8k, Brushed,Hairline,PVD Coating,Sandblasted |
| Service | Laser Cutting, Bending |
| Sample | Available |
254SMO Stainless Steel Sheet Corrosion-Resistant, High-Strength Alloy Plate
In industrial environments where corrosion, extreme temperatures, and mechanical stress converge, material performance directly determines operational safety, efficiency, and cost-effectiveness. 254SMO stainless steel sheet—classified under UNS S31254, EN 1.4547, and F44—stands out as a super austenitic alloy engineered to thrive in the harshest conditions that defeat conventional stainless steels like 304 or 316L. Developed by Sweden’s Sandvik, this high-alloy plate combines exceptional corrosion resistance, impressive mechanical strength, and versatile processability, making it the material of choice for critical applications across marine engineering, petrochemicals, desalination, and more. This comprehensive guide explores the core properties, specifications, applications, and advantages of 254SMO stainless steel sheet, helping engineers, procurement professionals, and project managers make informed decisions for demanding projects.
Core Characteristics: Corrosion Resistance Redefined
The defining strength of 254SMO lies in its advanced alloy composition, which prioritizes resistance to the most destructive forms of corrosion. Unlike standard stainless steels, 254SMO features a precise balance of high molybdenum (Mo), nickel (Ni), chromium (Cr), and nitrogen (N) content, complemented by ultra-low carbon (C ≤ 0.02%) to eliminate sensitization risks.
Pitting and Crevice Corrosion Resistance
At the heart of its performance is a Pitting Resistance Equivalent Number (PRE) of ≥ 42, far exceeding 316L (PRE ≈ 25) and even 2205 duplex stainless steel (PRE ≈ 35) . This high PRE value means 254SMO can withstand prolonged exposure to chloride-rich environments—such as seawater, brine, and chemical process streams—without developing pitting or crevice corrosion, two of the most common causes of premature material failure. In seawater, offshore platforms, and desalination plants, where chloride concentrations can reach extreme levels, 254SMO maintains structural integrity for decades, outperforming traditional alloys that degrade within months .
Stress Corrosion Cracking (SCC) Resistance
Chloride-induced stress corrosion cracking is a major threat in high-pressure, high-temperature industrial settings. 254SMO’s alloy design—high nickel for austenitic stability and nitrogen for strengthening—renders it highly resistant to SCC even under cyclic stress and aggressive chemical exposure. This makes it ideal for components like heat exchangers, pressure vessels, and piping systems in petrochemical refineries and 烟气脱硫 (FGD) plants, where temperature fluctuations and corrosive media create perfect conditions for SCC .
Uniform Corrosion Resistance
Beyond localized corrosion, 254SMO exhibits excellent resistance to uniform corrosion in a wide range of aggressive media. It performs reliably in oxidizing acids (nitric, sulfuric), reducing acids (hydrochloric, phosphoric), and organic acids (acetic, formic), as well as alkaline solutions and industrial chemicals. This versatility allows it to replace more expensive nickel-based alloys (e.g., Alloy 625) and titanium in many applications, delivering comparable performance at a more cost-effective price point .
Mechanical Properties: Strength Meets Toughness
254SMO is not just a corrosion-resistant alloy—it also delivers impressive mechanical strength and ductility, ensuring durability under both static and dynamic loads. These properties are optimized through 固溶 heat treatment (1040–1100°C quenching), which refines the microstructure and enhances both strength and corrosion resistance .
Key Mechanical Performance Metrics
| Property | Specification (Solution Annealed) |
|---|---|
| Tensile Strength | ≥ 620 MPa (min); Typical 650 MPa |
| Yield Strength (0.2% Offset) | ≥ 300 MPa (min); Typical 320 MPa |
| Elongation | ≥ 35% |
| Brinell Hardness (HB) | ≤ 270 |
| Density | 8.0–8.1 g/cm³ |
| Melting Point | 1320°C |
| Operating Temperature Range | -50°C to 300°C |
The alloy’s high tensile and yield strength make it suitable for load-bearing components, while its exceptional elongation (≥ 35%) ensures flexibility during fabrication and resistance to brittle fracture in low-temperature environments. Whether used in cryogenic applications or high-pressure systems, 254SMO maintains its toughness and structural stability, minimizing the risk of catastrophic failure .
Comparative Strength vs. Common Stainless Steels
When compared to widely used grades like 316L and 2205, 254SMO offers a superior balance of strength and corrosion resistance:
| Alloy Grade | Tensile Strength (MPa) | Yield Strength (MPa) | PRE Value | Chloride Resistance |
|---|---|---|---|---|
| 316L | 485–655 | ≥ 170 | ≈ 25 | Moderate |
| 2205 Duplex | 620–850 | ≥ 450 | ≈ 35 | Good |
| 254SMO | ≥ 620 | ≥ 300 | ≥ 42 | Excellent |
While 2205 duplex steel offers higher yield strength, 254SMO’s significantly higher PRE value makes it the clear choice for chloride-rich or highly corrosive environments. For applications requiring both corrosion resistance and structural strength, 254SMO delivers unmatched reliability .
Chemical Composition: The Science Behind Performance
254SMO’s exceptional properties are directly attributed to its precisely controlled chemical composition, which adheres to international standards (ASTM A240, EN 1.4547, GB/T 3280). The following table outlines the nominal and allowable ranges for key alloying elements:
| Element | Content Range (Mass Percentage) |
|---|---|
| Carbon (C) | ≤ 0.02% |
| Manganese (Mn) | ≤ 1.0% |
| Silicon (Si) | ≤ 0.8% |
| Chromium (Cr) | 19.5–20.5% |
| Nickel (Ni) | 17.5–18.5% |
| Molybdenum (Mo) | 6.0–6.5% |
| Nitrogen (N) | 0.18–0.22% |
| Phosphorus (P) | ≤ 0.040% |
| Sulfur (S) | ≤ 0.030% |
| Cerium (Ce) | 0.03–0.08% |
| Iron (Fe) | Balance |
Each element plays a critical role in the alloy’s performance:
- Chromium and molybdenum form a dense, protective oxide layer on the surface, blocking corrosive agents from penetrating the base metal.
- Nickel stabilizes the austenitic microstructure, enhancing ductility and toughness.
- Nitrogen acts as a strengthening agent, increasing tensile and yield strength without compromising ductility.
- Ultra-low carbon content prevents the formation of chromium carbides during heat treatment or welding, eliminating intergranular corrosion risks .
Specifications and Customization Options
254SMO stainless steel sheets are available in a wide range of sizes, finishes, and configurations to meet the unique requirements of different industries. Manufacturers adhere to strict international standards to ensure consistency and quality, with customizable options for specialized projects.
Standard Specifications
| Parameter | Range |
|---|---|
| Thickness | 0.1 mm – 300 mm |
| Width | 50 mm – 3500 mm |
| Length | 1 m – 12 m (Custom lengths available) |
| Standard Sizes (mm) | 1000×2000, 1220×2440, 1500×3000, 2000×4000 |
| Surface Finishes | Hot Rolled (HR) Pickled & Annealed (No. 1), Cold Rolled (CR) 2B, 2D, Bright Annealed (BA), Satin, Polished |
| Standards Compliance | ASTM A240, ASME SA240, EN 1.4547, UNS S31254, GB/T 3280 |
| Certifications | Mill Test Certificate (MTC), Chemical & Mechanical Property Reports |
Customization Capabilities
For projects with unique requirements, 254SMO sheets can be customized in terms of:
- Non-standard thicknesses (0.15 mm – 300 mm) and dimensions to fit specific equipment designs.
- Special surface finishes (e.g., mirror polish, brushed) for aesthetic or functional needs.
- Cut-to-size services to minimize waste and reduce on-site processing time.
- Welding and fabrication support, including recommended Ni-based welding consumables (e.g., Alloy 625, ERNiCrMo-3) to maintain corrosion resistance in welded joints .
Industrial Applications: Where 254SMO Excels
254SMO’s unique combination of corrosion resistance, strength, and processability makes it indispensable in industries where failure is not an option. Below are its key application areas:
Marine Engineering and Offshore
- Offshore platforms: Deck plates, piping systems, and structural components exposed to seawater and salt spray.
- Shipbuilding: Hull cladding, ballast tanks, and seawater cooling systems.
- Subsea equipment: Manifolds, connectors, and risers that operate in high-pressure, high-chloride environments .
Desalination Plants
- Reverse osmosis (RO) systems: Pressure vessels, membranes, and piping that handle concentrated brine.
- Seawater intake and discharge systems: Components resistant to biofouling and chloride corrosion .
Petrochemical and Chemical Processing
- Refineries: Heat exchangers, condensers, and piping for crude oil processing and acid recovery.
- Chemical reactors: Vessels handling aggressive media such as sulfuric acid, hydrochloric acid, and chlorinated solvents.
- Flue Gas Desulfurization (FGD): Ductwork, scrubbers, and mist eliminators exposed to corrosive SO₂ byproducts .
Food and Pharmaceutical Processing
- Equipment for processing acidic foods (e.g., tomatoes, citrus fruits) and corrosive cleaning agents.
- Pharmaceutical manufacturing: Vessels and piping requiring high purity and resistance to sterilization chemicals .
Pulp and Paper Industry
- Digesters, bleach plants, and recovery boilers handling corrosive chemicals (e.g., chlorine dioxide, caustic soda) .
Advantages Over Conventional Alloys
Choosing 254SMO over standard stainless steels or even more expensive materials offers several key benefits:
Superior Corrosion Resistance
- Outperforms 316L and 2205 in chloride-rich environments, reducing maintenance costs and extending service life.
- Eliminates the need for expensive corrosion inhibitors or protective coatings in many applications .
Cost-Effectiveness
- Serves as a viable alternative to nickel-based alloys (e.g., Alloy 625) and titanium, delivering similar performance at a lower cost.
- Reduces downtime and replacement costs due to its long service life and resistance to premature failure .
Versatile Processability
- Good weldability with proper consumables, allowing for complex fabrications.
- Acceptable cold and hot working properties, enabling bending, forming, and machining (with appropriate tooling for its higher strength) .
Reliable Performance Across Temperatures
- Maintains toughness in cryogenic conditions (-50°C) and stability in high-temperature applications up to 300°C.
- Resists thermal fatigue in systems with frequent temperature fluctuations .
Installation and Maintenance Guidelines
To maximize the performance and service life of 254SMO stainless steel sheets, follow these key guidelines:
Welding Practices
- Use Ni-based welding consumables (e.g., ERNiCrMo-3, Alloy 625) to match the alloy’s corrosion resistance.
- Perform post-weld heat treatment (solution annealing at 1100°C followed by water quenching) to restore the material’s microstructure and eliminate welding-induced sensitization .
Machining Tips
- 254SMO is harder to machine than 316L due to its higher strength. Use high-speed steel (HSS) or carbide tools with sharp cutting edges.
- Apply adequate lubrication and moderate cutting speeds to prevent work hardening .
Cleaning and Maintenance
- Remove surface contaminants (oils, greases, weld spatter) promptly using mild detergents or stainless steel cleaners.
- Avoid contact with carbon steel during storage or installation, as this can cause galvanic corrosion.
- Regular inspections (visual or non-destructive testing) to detect any signs of corrosion or mechanical damage early .
Conclusion
254SMO stainless steel sheet represents the pinnacle of super austenitic stainless steel technology, offering unmatched corrosion resistance, reliable mechanical strength, and versatile processability for the most demanding industrial applications. Its ability to withstand chloride-rich environments, aggressive chemicals, and extreme temperatures makes it a cost-effective alternative to nickel-based alloys and titanium, delivering long-term value through reduced maintenance, minimized downtime, and extended service life.
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