254 SMO Stainless Steel Pipe: supplier, stockist and exporter in Mumbai, India
Rajgranth Metal & Alloys supplies 254 smo stainless steel pipe (UNS S31254) from Mumbai and exports it to 18 markets.
What is 254 SMO pipe?
Pipe is sized by nominal bore and schedule and is made to carry fluid or to act as structural section. 254 SMO pipe is supplied welded or seamless depending on the duty: welded for general and larger-diameter lines, seamless where there must be no weld seam or the design code requires it. 254 SMO (UNS S31254, EN 1.4547) is a 6-molybdenum super-austenitic stainless steel with about 20 percent chromium, 18 percent nickel and 6 percent molybdenum, plus nitrogen. It was developed for seawater and bleach-plant duty, where ordinary stainless pits and crevice-corrodes within months.
6% molybdenum super-austenitic with nitrogen. PREN above 42.
Rajgranth Metal & Alloys lists 254 SMO among the grades it supplies and exports from Mumbai.
254 SMO designations and equivalents
| Standard | Designation |
|---|---|
| UNS | S31254 |
| EN / Werkstoff | 1.4547 |
| Also called | SMO 254, 6Mo, S31254 |
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254 SMO chemical composition
Limits are those of the standard named in the table caption. Product-specific standards for pipe, tube and bar carry their own limits, so always confirm the composition on the mill test certificate supplied with the material.
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulphur | Chromium | Nickel | Molybdenum | Copper | Nitrogen |
|---|---|---|---|---|---|---|---|---|---|---|
| Limit | 0.020 max | 1.00 max | 0.80 max | 0.030 max | 0.010 max | 19.50 – 20.50 | 17.50 – 18.50 | 6.00 – 6.50 | 0.50 – 1.00 | 0.18 – 0.25 |
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254 SMO mechanical properties
| Property | Requirement |
|---|---|
| Tensile strength | 650 MPa minimum |
| Yield strength (0.2% offset) | 300 MPa minimum |
| Elongation in 50 mm | 35% minimum |
| Hardness | 96 HRB maximum |
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254 SMO pipe: sizes and finishes
The published size range, finishes and conditions for pipe are set out on the seamless pipes and welded pipes pages, which list every dimension we publish. Sizes outside the range can be produced to order; send the dimensions with your enquiry.
| Parameter | Range |
|---|---|
| Seamless Pipes: Outside diameter | 10.3 to 609.6 (mm) |
| Seamless Pipes: Nominal bore | 1/8″ NB, 40″ NB (1/4″ to 24″ held as primary stock range) |
| Seamless Pipes: Schedule | SCH 5 to SCH XXS |
| Seamless Pipes: Wall thickness | 0.71 to 8.0 (SWG, mm) |
| Seamless Pipes: Length | 5 m, 6.5 m (Customised up to 12 m per requirement) |
| Seamless Pipes: Pipe ends | Plain, Bevelled |
| Seamless Pipes: Marking | Size, Grade, Specification, Heat number |
| Welded Pipes: Outside diameter | 10.3 to 609.6 (mm) |
| Welded Pipes: Schedule | SCH 5 to SCH XXS |
| Welded Pipes: Wall thickness | 0.71 to 8.0 (SWG, mm) |
| Welded Pipes: Length | 5 m, 6.5 m (Customised up to 12 m per requirement) |
| Welded Pipes: Pipe ends | Plain, Bevelled |
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Standards for 254 SMO pipe
254 SMO pipe is commonly specified to ASTM A312 / ASME SA-312, ASTM A358 and ASTM A269. Commonly specified product standards. Confirm the standard, edition and any supplementary requirements on your order; we supply to the standard you name.
Why buyers choose 254 SMO pipe
Very high resistance to pitting and crevice corrosion in chlorides
Higher strength than 316L or 904L
Good toughness and weldability for a high-alloy grade
Where 254 SMO pipe is used
- Seawater cooling and piping
- Pulp and paper bleach plants
- Flue gas desulphurisation
- Offshore and desalination equipment
- Chloride-bearing chemical process lines
What to state when you enquire for 254 SMO pipe
- Nominal bore and schedule, or outside diameter and wall thickness
- Seamless or welded
- Length, with 5 m to 6.5 m the published stock range and longer to order
- End condition: plain or bevelled
- Surface condition: annealed and pickled, bright annealed or polished
- The standard, and the test certificate required
What to check on 254 SMO pipe before and after delivery
On 254 SMO pipe check the wall thickness against the schedule, the end preparation, and the heat number against the mill test certificate. For welded pipe, ask whether the weld seam has been dressed if the pipe is for exposed or polished use. Confirm that the pressure rating and design code your line is built to accept the grade and the pipe standard. Grade limits to design around: costs significantly more than 316L and duplex and special welding filler and procedure are needed to keep corrosion resistance in the weld.
Export of 254 SMO pipe from India
254 SMO pipe is exported from Mumbai to 18 confirmed markets, quoted with the Incoterm and named port.
254 SMO compared with similar grades
Buyers who look at 254 SMO pipe usually also compare SS 904L and Super Duplex 2507. The grade pages below give each one's designations, properties and limits side by side so you can choose for the service rather than the price alone.
FAQ
09Questions answered
- What does 6Mo mean?
- It refers to the roughly 6 percent molybdenum content that gives 254 SMO and similar grades their very high pitting resistance.
- How does 254 SMO compare with super duplex 2507?
- Both resist chlorides very well. 2507 is stronger, so it allows thinner walls, while 254 SMO is austenitic and more tolerant of some fabrication routes.
- Is 254 SMO weldable?
- Yes, with suitable over-alloyed filler and procedure, so the weld keeps the corrosion resistance of the parent metal.
- What is the difference between 254 SMO pipe and tube?
- Pipe is specified by nominal bore and schedule, which fixes the wall for each size. Tube is specified by actual outside diameter and wall thickness. If you have an outside diameter and a wall, you are normally buying tube.
- Which standard applies to 254 SMO pipe?
- 254 SMO pipe is commonly specified to ASTM A312 / ASME SA-312, ASTM A358 and ASTM A269. Confirm the standard and edition on your order.
- What is the minimum yield and tensile strength of 254 SMO?
- In the annealed condition, 254 SMO has a minimum yield strength of 300 MPa and a minimum tensile strength of 650 MPa, per the standard named in the table above.
- What is the UNS number and EN designation of 254 SMO?
- 254 SMO Stainless Steel is designated UNS S31254 and EN 1.4547, and is also called SMO 254, 6Mo and S31254.
- What are the main alloying elements in 254 SMO?
- To the standard in the composition table, 254 SMO carries chromium 19.50 – 20.50, nickel 17.50 – 18.50 and molybdenum 6.00 – 6.50 percent by weight. Confirm the composition on the mill test certificate supplied with your material.
- Do you supply a mill test certificate with 254 SMO pipe?
- Yes, to EN 10204 3.1 as standard, showing chemistry and mechanical properties against the heat. EN 10204 3.2 with third-party inspection is available on request.
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