254 SMO Stainless Steel Round Bar: supplier, stockist and exporter in Mumbai, India
Rajgranth Metal & Alloys supplies 254 smo stainless steel round bar (UNS S31254) from Mumbai and exports it to 18 markets.
What is 254 SMO round bar?
Round bar is solid feedstock for machined and forged parts, supplied in a stated delivery condition and tolerance class. 254 SMO bar is bought for shafts, valve and pump parts, fasteners and other components where the grade's properties are needed in the finished part. 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 round bar: sizes and finishes
The published size range, finishes and conditions for round bar are set out on the round bars pages, which list every dimension we publish. Sizes outside the range can be produced to order; send the dimensions with your enquiry.
| Parameter | Range |
|---|---|
| Diameter | 10 mm, 300 mm |
| Shape | Round, Square, Hexagonal, Threaded |
| Tolerance | H7, H8, H9, H10 |
| Length | 5 m, 6.5 m (Customised length per requirement) |
| Bar ends | Plain, Bevelled |
| Marking | Size, Grade, Specification, Heat number |
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Standards for 254 SMO round bar
254 SMO round bar is commonly specified to ASTM A276 and ASTM A479. 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 round bar
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 round bar 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 round bar
- Shape: round, square, hexagonal or threaded
- Diameter in mm and tolerance class, with H7 to H10 published
- Delivery condition: export bright, peeled or turned, cold drawn, centreless ground and polished, black or forged
- Length: 5 m to 6.5 m published, cut lengths to order
- Bar ends: plain or bevelled
- Marking: size, grade, specification and heat number
What to check on 254 SMO round bar before and after delivery
Check the delivery condition, diameter and straightness of 254 SMO bar against the order, and the heat number against the certificate. How machinable the bar is depends on the grade and the condition it is supplied in, so confirm the cutting data with your tooling supplier, and tell us if the part will be heat treated afterwards. 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 round bar from India
254 SMO round bar 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 round bar 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 diameters of 254 SMO bar do you supply?
- Diameters from 10 mm to 300 mm are published for bar, in round, square, hexagonal and threaded shapes. Send the size and tolerance class and we confirm.
- Which standard applies to 254 SMO round bar?
- 254 SMO round bar is commonly specified to ASTM A276 and ASTM A479. 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 round bar?
- 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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