Super Duplex 254smo Sheet
1. Standard: ASTM A240、ASME SA240
2. Thickness: 0.4mm - 50mm
3. Width: 1000 - 2000mm
4. Length: 2000mm - 6000mm
ASTM A240 UNS S31254 Sheet Supplier, Manufacturer
S31254, commonly referred to by its UNS designation S31254 or trade names such as 254 SMO or 1.4547, is a super austenitic stainless steel. Developed to address the limitations of standard alloys in extreme conditions, S31254 is renowned for its resilience in environments rich in chlorides, acids, and other aggressive media. Its adoption spans industries ranging from offshore oil and gas to chemical processing and desalination, where material failure is not an option. HT PIPE is a 254smo sheet supplier with 15+ export experience. Contact us for more information and quotes for free!
ASTM A240 UNS S31254 chemical properties
The exceptional performance of S31254 is rooted in its meticulously balanced chemical composition. The alloy is fortified with high levels of chromium (19.5–20.5%), nickel (17.5–18.5%), and molybdenum (6–6.5%), complemented by controlled additions of nitrogen (0.18–0.22%) and copper (0.5–1.0%). Chromium enhances oxidation resistance by forming a passive oxide layer, while molybdenum and nitrogen synergistically boost resistance to localized corrosion, such as pitting and crevice corrosion.
S31254 plate mechnical properties
With a tensile strength of 650–850 MPa and elongation exceeding 35%, the alloy combines high strength with remarkable ductility, enabling its use in structurally demanding applications. Its toughness is retained at cryogenic temperatures. The physical properties, including a thermal expansion coefficient similar to carbon steel and thermal conductivity of 15 W/m·K, ensure compatibility with traditional fabrication techniques. Moreover, the alloy's magnetic permeability remains low due to its fully austenitic structure.
EN 1.4547 plate Material Testing
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Flattening Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Test
uNS S31254 sheet Corrosion Resistance
In environments where chlorides, sulfuric acid, or brine are prevalent, conventional stainless steels often succumb to rapid degradation. S31254, however, thrives in these conditions. For instance, in seawater applications-where chloride concentrations are high-the alloy demonstrates negligible pitting even after prolonged exposure. Its resistance to sulfuric acid at moderate concentrations (up to 40% at 20°C) further expands its utility in chemical processing equipment.
s31254 steel Sheet Fabrication and Machining Considerations
Welding of 254smo requires low heat input methods such as TIG (Tungsten Inert Gas) or laser welding to prevent segregation of alloying elements. Post-weld heat treatment is generally unnecessary, but pickling or passivation is recommended to restore the passive oxide layer. Machining S31254 demands tools with high wear resistance, as the alloy's toughness and tendency to work-hardening can lead to rapid tool wear.
sS 254 smo Plate Cold/hot working
Cold working should avoid over-hardening, intermediate annealing is recommended.
Hot working temperature range: 1150-900°C, solution treatment is required after processing (1050-1150°C rapid cooling).
ASTM A240 S31254 Plate Specification
| Specification | ASTM A240 UNS S31254, ASME SA240, MSRR, AMS, BS |
|---|---|
| Sizes (mm) | 1000 x 2000, 1220 x 2440, 1500 x 3000, 2000 x 2000, 2000 x 4000 |
| Thickness | 0.1 to 100 mm Thk |
| Width | 10-2500mm |
| Length | 2m, 2.44m, 3m, or as required |
| Finish | HR, CR, 2B, 2D, BA, NO(8), SATIN |
| Hardness | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Stock in form of | hot-rolled, Coils, Rolls, Circle, Flat, Sheet, cold-rolled, Strip, Checker, sheared, Flats, Rolling, Shim, Clad, Tread, Foils, soft-annealed, descaled, annealed, Plate, Blank |
F44 UNS S31254 Material Equivalent Standard
| STANDARD | WERKSTOFF NR. | UNS | SIS | AFNOR | EN |
| SMO 254 | 1.4547 | S31254 | 2378 | Z1 CNDU 20.18.06Az | X1CrNiMoCuN20-18-7 |
Application of 254smo Plate
- Marine engineering: desalination plants, ship pipelines, seawater heat exchangers.
- Chemical industry: reaction vessels, pipelines, pumps and valves (especially in environments containing Cl⁻ or H₂S).
- Environmental protection equipment: flue gas desulfurization (FGD) systems, wastewater treatment equipment.
- Energy industry: nuclear power cooling systems, oil and gas extraction equipment.
- Pharmaceuticals and food: high-purity media delivery systems.
Alloy 254 SMO Plate Sizes
| Sizes in Inches | Sizes in mm |
| .125" | 3.18 |
| .134" | 3.4 |
| .156" | 3.96 |
| .187" | 4.75 |
| .250" | 6.35 |
| .312" | 7.92 |
| .375" | 9.53 |
| .500" | 12.7 |
| .625" | 15.9 |
| .750" | 19.1 |
| .875" | 22.2 |
| 1" | 25.4 |
| 1.125" | 28.6 |
| 1.250" | 31.8 |
| 1.500" | 38.1 |
| 1.750" | 44.5 |
| 2" | 50.8 |
| 2.500" | 63.5 |
| 3" | 76.2 |
Smo 254 Plates Weights
| Thickness | Plate Weight per Unit Area | Density |
| 3/16 inches | 0.06000 lbs/in²42.184176 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1/4 inches | 0.08 lbs/in²56.245568 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 3/8 inches | 0.121 lbs/in²85.0714216 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1/2 inches | 0.161 lbs/in²113.1942056 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 5/8 inches | 0.196 lbs/in²137.8016416 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 3/4 inches | 0.235 lbs/in²165.221356 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 7/8 inches | 0.274 lbs/in²192.6410704 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1 inches | 0.313 lbs/in²220.0607848 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1 1/4 inches | 0.391 lbs/in²274.9002136 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1 1/2 inches | 0.47 lbs/in²330.442712 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 1 3/4 inches | 0.549 lbs/in²385.9852104 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 2 inches | 0.627 lbs/in²440.8246392 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 2 1/4 inches | 0.705 lbs/in²495.664068 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 2 1/2 inches | 0.784 lbs/in²551.2065664 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 2 3/4 inches | 0.862 lbs/in²606.0459952 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
| 3 inches | 0.941 lbs/in²661.5884936 kg/m² | 0.315 lbs/in³8.72 g/cm³ |
254 SMO EN 1.4547 Plate Thickness
| 254 SMO Plate Thickness (mm) | 254 SMO Plate Dimensions |
| 1.5 | 3m x 1.5m |
| 2 | 3m x 1.5m |
| 3 | 3m x 1.5m |
| 5 | 3m x 1.5m / 4m x 2m |
| 6 | 3m x 1.5m / 4m x 2m / 6m x 2m |
| 8 | 3m x 1.5m / 4m x 2m / 6m x 2m |
| 10 | 3m x 1.5m / 4m x 2m / 6m x 2m |
| 12 | 3m x 1.5m / 4m x 2m / 6m x 2m |
| 15 | 4m x 2m / 6m x 2m |
| 20 | 4m x 2m / 6m x 2m |
FAQ
Q: About 254smo Plate prices?
A: Prices from ranges $2 - $10 per kilogram, vary depending on size, wall thickness, supplier etc.
Q: How long does your delivery time take?
A: Delivery time is within 5-21 days
Q: Is There Sample Service?
A: Samples Are Provided Free Of Charge
Q: What Is The Minimum Order Quantity?
A: No Minimum Order Quantity
Q: How to pack the products?
A: The inner layer has a waterproof paper outer layer and is fixed with a fumigation wooden pallet.
Q: Exported Countries
A: Brazil, South Africa, Indonesia, India, Singapore, Malaysia, Iran, Russia, UAE, Chile, Laos, etc
Q: Can we visit your factory?
A: Of course, you are always welcome!
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