We are Riddhi Siddhi Impex, a Mumbai-based SMO 254 Foils manufacturer, supplier, and exporter, established in 2002. We slit this super-austenitic 6Mo stainless steel foil to ASTM A240 / ASME SA-240 in thicknesses from 0.03 mm to 0.08 mm. Our ISO 9001, 14001, and 45001-certified company carries ready stock, 400-500 tons monthly supply capacity, and EN 10204 Type 3.1 / 3.2 certificates on request.
SMO 254 foil is a thin, cold-rolled super austenitic stainless steel foil built on roughly 20% chromium, 18% nickel, 6% molybdenum, copper, and 0.2% nitrogen. That chemistry pushes the pitting resistance equivalent number above 40, so the grade prevents chloride pitting, crevice attack, and stress corrosion cracking where 316L fails. Its yield strength is approximately double that of standard austenitic grades, letting fabricators work with thinner sections in seawater and acid service. It is mainly applied in chemical and petrochemical industries and desalination plants.
We process every UNS S31254 foil in-house on our own slitting lines, sourced from reputed primary mills. Material leaves in soft annealed condition to ASTM A240, cut to any width between 3 mm and 2000 mm and held to ±0.1 mm. Buyers can specify BA or 2B surfaces and slit, deburred, or round edges, backed by mill test certification.
We provide ASTM A240 S31254 foil in annealed condition, cold rolled and precision slit, in two surface finishes and four edge options, in coil.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240, ASTM B625 |
| Thickness | 0.03 mm to 5 mm |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
| Supply Form | Cold Rolled (CR) |
Molybdenum defines this grade. The 6.0 to 6.5% addition, working with 0.18 to 0.22% nitrogen, drives a PREN near 43, the margin that keeps 254 SMO foil serviceable in warm seawater. Copper at 0.50 to 1.00% adds resistance in sulphuric acid. The full ASTM A240 balance appears below.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.020 max |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.010 max |
| Silicon (Si) | 0.80 max |
| Chromium (Cr) | 19.50 to 20.50 |
| Nickel (Ni) | 17.50 to 18.50 |
| Molybdenum (Mo) | 6.00 to 6.50 |
| Copper (Cu) | 0.50 to 1.00 |
| Nitrogen (N) | 0.180 to 0.220 |
Strength sets 6Mo foil apart. Annealed UNS S31254 foil to ASTM A240 carries a 650 MPa minimum tensile strength with a 300 MPa minimum yield, close to twice the yield of 304 or 316. These minimums apply to material 0.50 mm and thicker, so values for thinner foil gauges are indicative. Foils leave in soft annealed condition only, so no temper ladder applies.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
650 MPa (94 ksi) |
|
Yield Strength (0.2% offset), minimum
|
300 MPa (44 ksi) |
|
Elongation in 50 mm, minimum
|
35% |
International buyers can cross-reference UNS S31254 foil against their regional standard below. The 1.4547 foil we stock matches every designation listed.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31254 |
| Europe (EN) | X1CrNiMoCuN20-18-7 |
| Germany (W.Nr) | 1.4547 |
| Sweden (SIS) | SS 2378 |
These 4 industries use 254 SMO foil that we slit. In each case, the buyer chooses the grade for chloride pitting resistance, crevice corrosion resistance, or high strength in a thin gauge.
Chemical plants use 6Mo foil for gaskets, diaphragms, and vessel linings in hot chloride and acid media. The copper addition helps in sulphuric acid service, while the high molybdenum content resists the pitting that perforates 316 in months.
Seawater resistance defines this duty. Desalination plants fit UNS S31254 foil into heat recovery components and instrumentation exposed to hot, high-chloride brine, where the PREN above 40 keeps pitting and crevice corrosion in check. The strength margin allows thinner parts than austenitic stainless steel would survive.
Chlorine dioxide bleaching lines corrode ordinary stainless steel quickly. Mills specify 254 SMO foil for washer components, seals, and bleaching hardware in warm, acidic, chloride-bearing liquor. The grade holds its passive film where 316L pits, extending service intervals for thin gasket and diaphragm stock.
Topside and subsea equipment runs in saline, sometimes sour, service. SMO 254 foil resists pitting and crevice attack in chloride-rich seawater while carrying the mechanical load offshore work demands. Slit to ±0.1 mm, it suits shim stock, seals, and instrumentation parts.
Export orders leave Mumbai and Taloja, packed in wooden cases or on pallets for sea freight.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
SMO 254 Foils price in India is around ₹1,200 to ₹1,600 per kg, and for international buyers it generally runs $11 to $17 per kg. As a premium 6% molybdenum grade, 254 SMO tracks global nickel and molybdenum rates, and thickness, width, finish, and quantity all move the figure. Call or WhatsApp us for today's rate.
We slit SMO 254 foils from 0.03 mm to 0.08 mm thick and to any width between 3 mm and 2000 mm. Gauge, width, and finish follow your requirements.
254 SMO foil contains 19.50 to 20.50% chromium, 17.50 to 18.50% nickel, 6.00 to 6.50% molybdenum, 0.50 to 1.00% copper, and 0.180 to 0.220% nitrogen per ASTM A240, with carbon at 0.020% maximum.
SMO 254 foils are covered by ASTM A240 / ASME SA-240 for flat-rolled products, and ASTM B625 also lists UNS S31254 sheet and strip. We supply to whichever standard your order needs.
You can source SMO 254 foils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds UNS S31254 foil on the shelf for immediate dispatch. As an SMO 254 foil manufacturer, stockist, and exporter, we serve buyers across India and overseas. WhatsApp us for a quote within 24 hours.
