254 SMO UNS S31254 Super Austenitic Stainless Steel Sheet with 6% Molybdenum PREN ≥ 43 and Chloride SCC Immunity
Product Details
| Alloy: | 254 SMO (UNS S31254 / EN 1.4547) | Temper: | Annealed, Cold Rolled, Hot Rolled |
|---|---|---|---|
| Thickness: | 0.5mm - 30mm | Width: | 1000mm, 1219mm, 1250mm, 1500mm, 2000mm |
| Length: | 2000mm, 2438mm, 3000mm, 6000mm Or Customized | Standard: | ASTM A240, EN 10088-2, NACE MR0175/ISO 15156, NORSOK M-650 |
| Surface Finish: | No.1, 2B, 2D, Pickled & Passivated | Tensile Strength: | ≥ 650 MPa |
| Yield Strength: | ≥ 300 MPa | Elongation: | ≥ 35% |
| PREN (Pitting Resistance): | ≥ 43.0 | CPT (Critical Pitting Temp): | ≥ 60°C (ASTM G48 Method C) |
| Application: | Seawater Desalination, Offshore Platforms, Chemical Tankers, FGD Systems, Bleach Plants | ||
| Highlight |
254 SMO Super Austenitic SS Sheet,UNS S31254 Seawater Resistant Plate,6Mo Super Austenitic Alloy Sheet |
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Product Description
254 SMO is a state-of-the-art super austenitic stainless steel containing 6% molybdenum, delivering extraordinary corrosion resistance that bridges the performance gap between standard 300-series stainless steels and high-nickel alloys. With a PREN ≥ 43, 254 SMO provides robust resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC) in the most demanding marine, chemical, and offshore environments. Its significantly higher strength compared to 316L allows for lighter designs with excellent lifecycle economics.
- Premium 6% Mo Super Austenitic: PREN ≥ 43 ensures exceptional pitting and crevice corrosion resistance in high-chloride environments
- Chloride SCC Immunity: High nickel and molybdenum content provides virtual immunity to chloride stress corrosion cracking
- Superior Seawater Performance: Proven in decades of seawater handling, MSF desalination, and offshore platform service
- High Strength: Tensile ≥ 650 MPa, yield ≥ 300 MPa — approximately 50% higher than 316L, enabling thinner, lighter designs
- Excellent Weldability: Weldable with over-alloyed Ni-Cr-Mo fillers (ERNiCrMo-3) maintaining full corrosion resistance
- Cost-Effective vs. Nickel Alloys: Delivers C-276 and 625 level corrosion resistance at a fraction of the material cost
| Element | C | Mn | Si | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| 254 SMO | ≤0.02 | ≤1.00 | ≤0.80 | ≤0.030 | ≤0.010 | 19.5-20.5 | 17.5-18.5 | 6.0-6.5 | 0.50-1.00 | 0.18-0.22 |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% offset) | ≥ 300 MPa |
| Elongation in 50mm | ≥ 35% |
| Hardness (Rockwell B) | ≤ 96 HRB |
| Density | 8.0 g/cm³ |
| PREN = %Cr + 3.3*%Mo + 16*%N | ≥ 43.0 |
| Parameter | Range |
|---|---|
| Thickness | 0.5mm - 30mm |
| Width | 1000mm - 2000mm |
| Length | 2000mm - 6000mm or Custom |
| Surface Finish | No.1, 2B, 2D, Pickled & Passivated |
- Multi-stage flash (MSF) and reverse osmosis (RO) desalination equipment
- Seawater intake, piping, and heat exchanger tube sheets
- Offshore oil and gas platform topside process equipment
- Chemical tanker cargo tanks and piping systems
- Flue gas desulfurization (FGD) absorber internals and outlet ducting
- Bleach plant washers and filtrate tanks in pulp and paper mills
- Tall oil distillation columns and fatty acid processing equipment
- Pharmaceutical and fine chemical reactor vessels
- NORSOK M-650 Qualified: Material qualification per NORSOK standards for offshore oil and gas projects
- ASTM G48 Testing: Critical pitting temperature (CPT) and crevice corrosion testing per ASTM G48 available for every heat
- Full NACE Compliance: NACE MR0175/ISO 15156 certified for H₂S-containing sour service environments
- Dual Sourcing: Premium Outokumpu mill material and cost-competitive TISCO domestic production options
- Technical Expertise: Application engineering support for material selection, welding procedures, and fabrication guidelines
Product Highlights
254 SMO (UNS S31254) is a premium 6% molybdenum super austenitic stainless steel delivering exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride environments. With PREN ≥ 43, it significantly outperforms standard 316L and bridges the gap between conventional austenitics and expensive nickel alloys. Ideal for seawater handling, desalination plants, chemical tankers, and offshore oil and gas equipment.
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