ASTM A240 F44 (UNS S31254 / 254 SMO) Super Austenitic Stainless Steel Plate for Marine and Chemical Applications
ASTM A240 F44 (UNS S31254 / 254 SMO) Super Austenitic Stainless Steel Plate
F44 Super Austenitic Stainless Steel Plate (UNS S31254 / 254 SMO) is a high-performance 6Mo super stainless steel featuring high chromium, nickel, molybdenum, and nitrogen alloying. With outstanding resistance to pitting corrosion, crevice corrosion, and chloride stress corrosion cracking, F44 provides excellent service performance in severe corrosive environments such as seawater, chemical processing, oil & gas, and environmental industries.
Key Features
- Excellent corrosion resistance with outstanding pitting and crevice corrosion resistance.
- High resistance to chloride stress corrosion cracking in harsh environments.
- High strength, excellent toughness, and good weldability.
- Excellent seawater and chemical corrosion resistance for demanding applications.
- Long service life with low maintenance requirements.
Typical Applications
- Seawater desalination equipment and marine engineering systems.
- Heat exchangers, condensers, and cooling systems.
- Chemical processing equipment and storage tanks.
- Oil & gas processing equipment, pipelines, and pressure vessels.
- Flue gas desulfurization (FGD) and environmental protection equipment.
- Pulp & paper, pharmaceutical, and food processing industries.
Chemical Composition (wt%)
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| Range | ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 19.5–20.5 | 17.5–18.5 | 6.0–6.5 | 0.18–0.25 | 0.50–1.00 |
Mechanical Properties (Solution Annealed + Water Quenched)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 650 MPa (94 ksi) |
| Yield Strength (Rp0.2) | ≥ 300 MPa (44 ksi) |
| Elongation (A5) | ≥ 35% |
| Density | 8.0 g/cm³ |
| Hardness | ≤ 223 HB |
| Max Service Temperature | 538℃(1000℉) |
Quality Assurance
All F44 (UNS S31254 / 254 SMO) super austenitic stainless steel plates undergo rigorous inspection, including PMI (Positive Material Identification), tensile and hardness testing according to ASTM A370, chemical composition analysis by OES, and complete dimensional and surface inspections. Full traceability is maintained from the original melt source to final shipment. Complete EN 10204 Type 3.1 Mill Test Reports (MTR) are available upon request.
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