Product Description
UNS S32254 is a high-performance super austenitic stainless steel designed for excellent corrosion resistance in extremely aggressive environments. This premium alloy features elevated levels of chromium, nickel, molybdenum, and nitrogen, providing exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. The superior corrosion performance of UNS S32254 makes it an excellent choice for applications in marine environments, chemical processing facilities, and other industries where exposure to harsh corrosive media is a concern. FUSHUN METAL offers UNS S32254 with consistent quality and precise specifications to meet your demanding industrial applications.
Applications
UNS S32254 super austenitic stainless steel is specifically engineered for use in extremely aggressive environments where standard austenitic grades would fail:
- Marine Applications:Seawater cooling systems, desalination plants, offshore oil and gas equipment, ship propeller shafts, and marine exhaust systems
- Chemical Processing:Heat exchangers, tanks, piping systems, and reaction vessels for processes involving hot acids and chloride-containing media
- Pulp and Paper Industry:Bleaching equipment, digesters, and components exposed to chloride-containing process chemicals
- Oil and Gas Industry:Downhole components, process equipment, and components exposed to sour gas (H₂S)
- Food Processing:Equipment handling brine solutions and other corrosive food processing environments
- Pollution Control:Flue gas desulfurization systems and equipment handling aggressive waste streams
Standards
UNS S32254 conforms to the following international standards:
- American Standards:
- ASTM A240/A240M (Plate, Sheet, and Strip)
- ASTM A479/A479M (Bar and Shapes)
- UNS S32254
Grade Equivalents
| UNS | AISI/ASTM | Common Name |
| S32254 | S32254 | 254 SMO |
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
| UNS S32254 (%) | ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.5-1.0 | 0.18-0.22 |
Mechanical Properties
UNS S32254 offers exceptional mechanical properties, making it suitable for demanding structural applications in corrosive environments:
| Property | Value |
| 0.2% Proof Stress (Rp0.2) | ≥300 MPa (43.5 ksi) |
| Tensile Strength (Rm) | 650-850 MPa (94.3-123.3 ksi) |
| Elongation (A5) | ≥35% |
| Hardness | ≤290 HB |
| Impact Strength | ≥100 J |
Heat Treatment
Solution annealing should be performed at 1150-1200°C (2100-2190°F) followed by rapid cooling in water or by other means for optimal corrosion resistance. UNS S32254 should not be used in the temperature range of 300-900°C (570-1650°F) for prolonged periods due to risk of precipitation of intermetallic phases.
Physical Properties
| Property | Value |
| Density | 8.0 g/cm³ (0.289 lb/in³) |
| Melting Range | 1370-1400°C (2500-2550°F) |
| Specific Heat (20°C) | 490 J/kg·K |
| Thermal Conductivity (20°C) | 14 W/m·K |
| Electrical Resistivity (20°C) | 0.85 μΩ·m |
| Young’s Modulus | 200 GPa |
Available Dimensions
FUSHUN METAL provides UNS S32254 in various product forms to meet your specific requirements:
Plate and Sheet
| Form | Thickness (mm) | Width (mm) | Length (mm) |
| Plate | 4.0 – 100.0 | 1000 – 3000 | 2000 – 12000 |
| Sheet | 0.5 – 4.0 | 1000 – 1500 | 2000 – 6000 |
Strip and Coil
| Form | Thickness (mm) | Width (mm) |
| Strip/Coil | 0.1 – 3.0 | 10 – 650 |
Bar and Wire
| Form | Diameter/Size (mm) | Length (mm) |
| Round Bar | 5.0 – 250.0 | 3000 – 6000 |
| Wire | 0.1 – 12.0 | Coil |
Corrosion Resistance
UNS S32254 exhibits exceptional corrosion resistance properties, particularly in chloride-containing environments:
- Pitting Resistance:Critical Pitting Temperature (CPT) exceeds 85°C in 6% FeCl₃ solution according to ASTM G48 Method A
- Crevice Corrosion Resistance:Critical Crevice Temperature (CCT) exceeds 45°C in 6% FeCl₃ + 1% HCl solution according to ASTM G48 Method D
- Stress Corrosion Cracking (SCC) Resistance:Highly resistant to SCC in hot chloride environments
- General Corrosion Resistance:Excellent resistance to a wide range of acids including sulfuric, phosphoric, and organic acids
The alloy’s high molybdenum and nitrogen content significantly enhances its resistance to localized corrosion, making it suitable for severe service conditions where standard stainless steels would rapidly deteriorate.
Fabrication Characteristics
Welding
UNS S32254 can be welded using most conventional welding methods, including TIG, MIG, plasma arc, and submerged arc welding. For optimal corrosion resistance in the weld and heat-affected zone, use matching or over-alloyed filler metals. Post-weld heat treatment is not normally required, but proper cleaning and passivation are essential for maximizing corrosion performance.
Forming and Machining
Due to its high work hardening rate, UNS S32254 requires higher forming forces than standard austenitic grades. Hot forming should be carried out at 950-1150°C (1740-2100°F) followed by solution annealing. For machining, lower cutting speeds and more powerful equipment are recommended compared to standard austenitic grades.
Why Choose FUSHUN METAL for UNS S32254
When sourcing high-performance super austenitic stainless steel like UNS S32254, quality and reliability are paramount. Here’s why customers worldwide trust FUSHUN METAL:
- Superior Quality Assurance:Comprehensive testing and inspection protocols ensure consistent mechanical properties and chemical composition
- Technical Expertise:Our metallurgists provide expert guidance on material selection, fabrication techniques, and corrosion resistance
- Competitive Pricing:Direct sourcing and efficient production allow us to offer premium materials at competitive market rates
- Custom Solutions:We can provide UNS S32254 in custom dimensions and surface finishes to meet your specific project requirements
- Global Logistics:Reliable delivery to international destinations with complete material certification and documentation
- Responsive Customer Service:Dedicated support team to address your technical inquiries and expedite your orders
For applications requiring exceptional corrosion resistance in aggressive environments, UNS S32254 from FUSHUN METAL offers the ideal combination of performance, reliability, and value. Contact us today to discuss your specific requirements and discover how our premium super austenitic stainless steel can enhance your project’s durability and longevity.
