254SMO/1.4547/S31254 Pipes Suppliers
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Looking for a reliable 254SMO pipe supplier?
If you are seeking a supplier of 254SMO piping, a manufacturer of UNS S31254 stainless steel pipes, or an exporter of EN 1.4547 super austenitic stainless steel pipes, you likely require a material capable of withstanding high-chloride environments, seawater corrosion, chemical processing conditions, and demanding pressure applications.
GNEE supplies ASTM/ASME-compliant 254SMO seamless and welded pipes, offering material traceability, third-party inspection support, EN 10204 3.1 Material Test Certificates (MTC), and customized solutions for industrial projects worldwide.
What is 254SMO stainless steel pipe?
254SMO is a super austenitic stainless steel. Unlike conventional 316L stainless steel, 254SMO (UNS S31254 / EN 1.4547) is a super austenitic grade containing 6% molybdenum, specifically engineered for superior corrosion resistance. With a Pitting Resistance Equivalent Number (PREN) typically exceeding 42-far higher than that of 316L stainless steel (approximately 24–26)-it is widely used in applications such as marine engineering, seawater desalination, chemical production, flue-gas desulfurization (FGD), and marine equipment.
254SMO / S31254 / 1.4547 Equivalent Grades
| Standard System | Equivalent Grade |
|---|---|
| Commercial Name | 254SMO / 6Mo Stainless Steel |
| UNS | S31254 |
| EN Number | 1.4547 |
| EN Designation | X1CrNiMoCuN20-18-7 |
| ASTM Pipe Grade | ASTM A312 S31254 |
| ASTM Tube Grade | ASTM A213 / A269 S31254 |
Chemical Composition of 254SMO (UNS S31254 / EN 1.4547)
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition (wt%) | ≤0.020 | ≤0.70 | ≤1.00 | ≤0.030 | ≤0.010 | 19.5–20.5 | 17.5–18.5 | 6.0–7.0 | 0.5–1.0 | 0.18–0.25 |
254SMO Pipe Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥650 MPa |
| Yield Strength (0.2%) | ≥300 MPa |
| Elongation | ≥35% |
| Density | Approx. 8.0 g/cm³ |
| PREN | ≥42 |
| Condition | Solution Annealed |
At Elevated Temperatures (Imperial)
| Temperature (°F) | Rp0.2 (ksi, min.) | Rp1.0 (ksi, min.) |
| 200 | 34 | 40 |
| 400 | 27 | 32 |
| 600 | 24 | 29 |
| 700 | 24 | 28 |
| 900 | 22 | 26 |
Impact Strength
| Test | Result |
| Charpy V-notch at −320°F (−196°C) | 60 J (44 ft-lb) - meets EN 13445-2 / EN 10216-5 |
Available Pipe Dimensions & Schedules
Round Pipe (ASTM A312 / ASME SA312)
| Product Type | OD Range | Wall Thickness | Length | Schedules |
| Seamless (Cold Finished) | 6.35 – 219 mm (¼" – 8") | 0.5 – 25 mm | up to 12 m | 5S – XXS |
| Seamless (Hot Finished) | 57 – 610 mm (2" – 24") | 3 – 50 mm | up to 12 m | 10 – XXH |
| Welded (ERW/LSAW) | 10.3 – 1219 mm (⅜" – 48") | 1.0 – 30 mm | up to 12 m | 5S – 80S |
| Heat Exchanger Tube (A213) | 6.35 – 127 mm | 0.9 – 12.7 mm | 6 / 12 m | Custom |
| Sanitary Tube (A269) | 9.5 – 152 mm (⅜" – 6") | 0.5 – 3 mm | Cut to length | Custom |
Square / Rectangular Tube
| Dimension (mm) | Wall (mm) | Length |
| 12 × 12 to 300 × 300 | 1.0 – 10.0 | Cut to length |
Pressure Rating (Selected, ASTM A312)
| NPS | OD (in.) | SCH 40S (in.) | Pressure (psig) | SCH 80S (in.) | Pressure (psig) | SCH 160 (in.) | Pressure (psig) |
| ½ | 0.840 | 0.109 | 3,900 | 0.147 | 5,500 | 0.322 | 10,500 |
| 1 | 1.315 | 0.133 | 3,200 | 0.179 | 4,300 | 0.250 | 5,900 |
| 2 | 2.375 | 0.154 | 2,800 | 0.218 | 4,000 | 0.344 | 5,700 |
| 4 | 4.500 | 0.237 | 2,100 | 0.337 | 3,100 | 0.531 | 4,200 |
| 6 | 6.625 | 0.280 | 1,800 | 0.432 | 2,700 | 0.719 | 3,800 |
Pressures calculated at 100°F per ASME B31.3, S = 16,000 psi allowable stress.
Applications of 254SMO Stainless Steel Pipe
| Industry | Specific Applications |
|---|---|
| Seawater Desalination | Multi-effect evaporator tubes, high-pressure reverse osmosis piping, seawater cooling pipelines |
| Chemical Processing | Sulfuric acid / phosphoric acid storage tanks, reactors, heat exchangers, process piping |
| Pulp & Paper Industry | Bleaching towers, evaporation systems, black liquor evaporators |
| Oil & Gas Industry | Offshore platform injection pipelines, sour oil and gas gathering systems |
| Environmental Protection | Flue gas desulfurization (FGD) absorber towers, scrubbers, pollution control equipment |
| Food & Pharmaceutical Industry | CIP cleaning systems, high-salt solution transfer pipelines |
| Marine Engineering | Seawater valves, chain protection tubes, ballast water systems |
HS Codes of 254SMO Stainless Steel Pipes
| Product Type | HS Code | Description |
|---|---|---|
| 254SMO Seamless Stainless Steel Pipe | 7304410000 | Tubes, pipes and hollow profiles, seamless, of stainless steel, cold-drawn or cold-rolled |
| 254SMO Seamless Stainless Steel Pipe (Large Size) | 7304490000 | Other seamless tubes and pipes of stainless steel |
| 254SMO Welded Stainless Steel Pipe | 7306400000 | Tubes, pipes and hollow profiles, welded, of stainless steel |
| 254SMO Heat Exchanger Tube | 7304410000 | Seamless stainless steel tubes for heat exchanger applications |
| 254SMO Sanitary Tube | 7306400000 | Welded stainless steel tubes and pipes |
| 254SMO Stainless Steel Pipe Fittings | 7307290000 | Other stainless steel tube or pipe fittings |
254SMO Stainless Steel Pipes price per kg
The global market price of 254SMO (UNS S31254 / DIN 1.4547) stainless steel pipes typically ranges from USD 9.00 to USD 30.00 per kg. In the China market, the price is generally around RMB 70 to RMB 220 per kg (and above) depending on raw material costs, manufacturing process, pipe dimensions, surface finish, and order quantity. Seamless pipes, large-diameter pipes, precision tubes, and customized specifications usually have higher prices due to stricter production requirements and processing costs.
MOQ: Items in stock can be ordered starting from a single unit; non-stock items are subject to production batch requirements (typically a minimum of 5–10 tonnes). Please provide specific specifications and quantities to request a quote.
254SMO/6MO pipe suppliers
GNEE provides 254SMO / UNS S31254 / EN 1.4547 stainless steel pipes with stable material supply, strict quality control, and international export experience.
- Products: Seamless Pipe, Welded Pipe, Heat Exchanger Tube, Sanitary Tube, Square & Rectangular Tube
- Standards: ASTM / ASME / EN / JIS compliant
- Certificates: EN10204 3.1 MTC, COC, SGS/BV/TÜV third-party inspection available
- Testing: PMI, UT, ET, RT, Hydrostatic Test, Mechanical Test
- Customization: OD, wall thickness, length, surface finish, and end machining according to customer drawings
-Delivery Time：Regular stock: shipment within 7–15 days; Customized production: 30–45 days
-Packaging：Wooden cases, steel frames, or bare packing according to destination port requirements; moisture-proof and rust-prevention protection provided
254SMO Pipe (UNS S31254 / EN 1.4547) Specification
| Product Type | Applicable Standard | Outside Diameter (OD) | Wall Thickness (WT) | Length | Typical Applications |
|---|---|---|---|---|---|
| 254SMO Seamless Pipe | ASTM A312 | 1/2" – 12" (12.7–323.9 mm) | 0.5 – 25 mm | 6 m / 12 m / Custom Length | Chemical processing, seawater piping, offshore equipment |
| 254SMO Welded Pipe | ASTM A312 | 1/2" – 48" (12.7–1219 mm) | 0.5 – 30 mm | 6 m / 12 m / Custom Length | Large diameter pipelines, desalination systems, industrial equipment |
| 254SMO Heat Exchanger Tube | ASTM A213 | 12.7 – 127 mm | 0.9 – 12.7 mm | 6 m / 12 m | Heat exchangers, condensers, seawater cooling systems |
| 254SMO Sanitary Tube | ASTM A269 | 3/8" – 6" | 0.5 – 3 mm | Custom Length | Pharmaceutical, food processing, semiconductor industries |
| 254SMO Square & Rectangular Tube | Customized Specification | 20×20 – 300×300 mm | 1 – 10 mm | Custom Length | Structural frames, special equipment fabrication |
Are you looking for 254SMO seamless or welded pipes (please specify outer diameter and wall thickness/schedule) for your project, or do you require matching 6Mo pipe fittings and flanges?Contact GNEE for 254SMO pipe quotation, datasheet, and project support.
Quality Control
Before shipment, GNEE performs strict quality inspections on 254SMO/6MO pipes, including PMI chemical verification, tensile and hardness testing, hydrostatic testing, ultrasonic testing (UT), eddy current testing (ET), dimensional inspection, and surface examination. Each pipe is traceable by heat number and supplied with EN10204 3.1 MTC to ensure compliance with ASTM A312/A213 requirements and reliable corrosion resistance in severe environments.
254SMO PMI
dimensional inspection
hardness testing
hydrostatic testing
eddy current testing
ultrasonic testing
Standard export packaging
GNEE uses export-standard packaging for 254SMO/6MO pipes, including seaworthy wooden cases, steel frames, and protective wrapping. Each pipe is separated to prevent scratches, with plastic caps and moisture-proof materials applied. Packing methods are customized according to pipe size, weight, and destination requirements to ensure safe delivery without corrosion or surface damage.
FAQ
Which is stronger: 254SMO or 316L?
254SMO, by roughly 50 % on yield strength. Nitrogen-driven solid solution strengthening gives it a typical minimum yield of 300 MPa (310 MPa minimum under ASTM A312) against about 170 MPa for 316L. That strength advantage can translate into a 10–15 % wall-thickness reduction in a pressure design, which partially offsets the higher material rate.
Is 254SMO a good substitute for titanium in desalination?
Frequently yes. For medium-pressure seawater lines and utility duties it delivers comparable service at a fraction of titanium's material cost, and can be fabricated in a conventional stainless shop. Titanium retains the advantage in high-pressure RO and thin-wall heat-exchanger tubing where strength-to-weight dominates, despite costing 4–6× a 316L baseline.
Which is better: 254SMO or super duplex 2507?
Neither universally - they occupy overlapping envelopes at similar cost (2.5–3.5× a 316L baseline). 2507 offers higher strength and comparable PRE with the attendant duplex constraints (temperature ceiling, heat-input discipline, ferrite balance). 254SMO is generally preferred where fully austenitic behaviour, simpler welding without phase balance concerns, and established seawater service history matter most.
Do I need post-weld heat treatment?
No. Neither preheat nor PWHT is required for normal welds when proper procedure is followed. Solution annealing at 1 100–1 200 °C with rapid quench is only needed after severe cold forming, not after welding.
