When a pharmaceutical giant's distillation column gaskets failed catastrophically in dilute sulfuric acid service, leaking contaminants and halting production for weeks, engineers turned to 904L and SMO-254 foils extending MTBF from 18 months to over 7 years while resisting pitting that devoured 316L alternatives.
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These super austenitic foils are revolutionizing chemical processing, oil & gas offshore platforms, marine scrubbers, pharma cleanrooms, and power desulfurization for procurement leaders demanding reliability over replacements.
904L (UNS N08904, 1.4539) with 4.5% Mo and high Cu excels in reducing acids per ASTM B625; SMO-254 (UNS S31254, 1.4547, 254 SMO) delivers 6Mo PREN>40 pitting resistance for seawater/chlorides per ASTM A240. Thin gauge foils (0.02-0.1mm) form lightweight gaskets, shims, liners ideal for hydrogen electrolyzer bipolar plates and luxury watch seals where purity meets precision.
Aurico Alloys LLP is the trusted 904L and SMO-254 foil supplier | exporter, stockist in India to abroad, providing affordable, authentic high-purity foils for hardware stores serving chemical, oil & gas, marine, pharma, power industries. Custom slit SMO-254 foil coils and verified exporter of high-nickel alloy foils to Middle East desalination markets with MTC EN 10204 3.1.
Superior to 316L/317L (low Mo) or Alloy 20 (less Cr), 904L foil handles sulfuric gaskets where 316L pits; SMO-254 vs 904L foil comparison shows 6Mo edge in crevice corrosion for desalination cutting failures 50% in marine ship scrubbers (IMO 2020 compliant). Super austenitic stainless steel foil stockist in Maharashtra optimizes for pump/valve maintenance over generic stainless.
Specification Overview
| Supplier | Aurico Alloys LLP - 904L & SMO-254 foil supplier in Mumbai |
|---|---|
| Grades | UNS N08904 (904L), S31254 (SMO-254) |
| Standards | ASTM B625 (904L), A240 (SMO-254); ASME SB625/SA240 |
| Thickness | 0.02mm – 0.1mm (thin gauge) |
| Width | Custom slit 10-1200mm |
| Finish | Annealed, pickled, high-purity |
| Delivery | Coils/foils, MTC EN 10204 3.1 |
Equivalent Grades & Standards
| Grade | UNS | Werkstoff | ASTM | Other |
|---|---|---|---|---|
| 904L | N08904 | 1.4539 | B625 | URB 282 OD |
| SMO-254 | S31254 | 1.4547 | A240 | 254 SMO |
Stock & Product Availability
904L shim stock manufacturer stocks UNS N08904 foil price per kg in India for sulfuric piping; SMO-254 foil supplier in Mumbai for offshore instrumentation; thin gauge 0.02mm to 0.1mm 904L foil for electronic shielding. Custom slit SMO-254 foil coils for chemical gaskets, verified exporter serving Middle East desalination.
Chemical Composition
| Element | 904L Max (%) | SMO-254 Max (%) |
|---|---|---|
| Ni | 23-28 | 17.5-18.5 |
| Cr | 19-23 | 19.5-20.5 |
| Mo | 4-5 | 6-6.5 |
| Cu | 1-2 | - |
| N | 0.1-0.3 | 0.18-0.25 |
| Fe | Bal | Bal |
| C | 0.02 | 0.01 |
Mechanical Properties
| Property | 904L | SMO-254 |
|---|---|---|
| Tensile (MPa) | 490 min | 650-850 |
| Yield (MPa) | 215 min | 300 min |
| Elong (%) | 35 | 35 min |
| Density (g/cm³) | 8.0 | 8.0 |
| PREN | ~36 | >40 |
Applications & Benefits
- 904L: Pharmaceutical distillation units, sulfuric acid gaskets (UNS N08904), pollution scrubbers (ASTM B625 904L foil exporter)
- SMO-254: Offshore oil instrumentation (SMO-254 foil supplier Mumbai), desalination exchangers (6-Moly stockist), marine scrubbers (UNS S31254)
- Both: Chemical plant maintenance (904L shim stock), pulp bleaching (ASTM A240 254-SMO), hydrogen electrolyzers
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
904L and SMO-254 foils from Aurico Alloys LLP fortify chemical plants, offshore platforms, marine scrubbers, and power systems against pitting/crevice failures. Secure your supply of UNS N08904/S31254 thin foils for unmatched durability.
Is your operation ready for super austenitic performance with 904L and SMO-254 foils?