254 SMO UNS S31254 Super Austenitic Stainless Steel Sheet with 6% Molybdenum PREN ≥ 43 and Chloride SCC Immunity
Price:
USD 12.0-18.5 / kg
MOQ:
300 kg
Delivery Time:
5-10 working days for stock, 20-35 days for production
Brand:
Hongtu
Product Description
254 SMO UNS S31254 Super Austenitic Stainless Steel Sheet 0.5mm-30mm for Seawater Desalination Equipment
Product Overview
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.
Key Features
- 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
Chemical Composition (Weight %)
| 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 |
Mechanical Properties (Annealed, Room Temperature)
| 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 |
Available Dimensions
| Parameter | Range |
|---|---|
| Thickness | 0.5mm - 30mm |
| Width | 1000mm - 2000mm |
| Length | 2000mm - 6000mm or Custom |
| Surface Finish | No.1, 2B, 2D, Pickled & Passivated |
Applications
- 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
Our Advantages
- 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
Contact our specialty alloys team for a comprehensive quotation on 254 SMO super austenitic stainless steel sheets. Premium product with full corrosion test documentation provided.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Jiangsu Hongtu Metal Technology Co.,Limited
Location
No.118 Beihuan Road, Xishan District, Wuxi City, Jiangsu Province China
Contact Person
Cathy