A Gulf Coast chemical plant lost $2.5 million in downtime when 904L shims in their sulfuric acid storage tanks pitted through in under two years, forcing emergency shutdowns but switching to Alloy 20, 28, and 31 foils extended service life beyond 10 years while cutting replacement costs 40%.
Table of Contents:
These super-austenitic foils have become indispensable for procurement heads, engineers, fabricators, and OEMs battling aggressive acids in chemical processing, oil & gas, marine scrubbers, pharma reactors, and power FGD systems. Aurico Alloys LLP delivers the thin-gauge solution for unmatched uptime and compliance.
Alloy 20 (UNS N08020, Carpenter 20), Alloy 28 (UNS N08028, Sanicro 28, 1.4563), and Alloy 31 (UNS N08031, Nicrofer 3127 hMo, 1.4562) form a corrosion-resistant progression for escalating threats. Alloy 20cb-3 excels in moderate sulfuric/phosphoric acids per ASTM B463; Alloy 28 dominates wet phosphoric evaporators; Alloy 31 handles 6Mo-level halide/chlorine attack per ASTM B625. Thin foils (0.05-0.5mm) enable lightweight gaskets, shims, and liners where weight savings boost efficiency in marine diesel scrubbers and oilfield sour gas wells.
Aurico Alloys LLP is the premier Alloy 20, 28, 31 foil supplier, stockist, exporter in India to abroad, equipping hardware stores and industrial suppliers with affordable, authentic ASTM-certified thin gauge foils. Custom slit widths support pickling equipment repairs, SO2 scrubbers, and HPAL plants, backed by MTC 3.1 for global chemical/marine compliance.
Why upgrade from 904L, 316L, or Hastelloy C276? These foils offer 2-5x better life in specific acids at 50-70% cost Alloy 20 foil for sulfuric storage beats 904L pitting resistance; Alloy 28 vs 904L foil wins in seawater-cooled exchangers; Alloy 31 foil vs C276 saves on high-concentration H2SO4. Ideal for fabricators needing weldable, formable shim stock without premium pricing.
Specification Overview
| Supplier | Aurico Alloys LLP - Alloy 20, 28, 31 foil supplier in Mumbai |
|---|---|
| Grades | UNS N08020, N08028, N08031 |
| Standards | ASTM B463 (20), B709 (28), B625 (31); ASME SB463/709/625 |
| Thickness | 0.05mm – 0.5mm |
| Width | Slit-to-width 10-1000mm |
| Finish | Annealed, pickled |
| Delivery | MTC 3.1, export packed |
Equivalent Grades & Standards
| Alloy | UNS | Werkstoff | ASTM | Trade Name |
|---|---|---|---|---|
| Alloy 20 | N08020 | 2.4660 | B463 | Carpenter 20Cb-3 |
| Alloy 28 | N08028 | 1.4563 | B709 | Sanicro 28 |
| Alloy 31 | N08031 | 1.4562 | B625 | Nicrofer 3127 hMo |
Stock & Product Availability
UNS N08020 thin gauge foil exporter from India stocks Alloy 20 shim stock for pickling repairs; Sanicro 28 foil stockist in Mumbai for phosphoric evaporators; Nicrofer 3127 hMo foil supplier in India for HPAL. Werkstoff 1.4563 Alloy 28 foil price per kg in Mumbai optimized for export to oil & gas sour service.
Chemical Composition
| Element | Alloy 20 Max (%) | Alloy 28 Max (%) | Alloy 31 Max (%) |
|---|---|---|---|
| Ni | 32-38 | 30-32 | 30-32 |
| Cr | 19-21 | 26-38 | 26-28 |
| Mo | 2-3 | 3-4 | 6-7 |
| Cu | 3-4 | 0.7-1.5 | 1-1.4 |
| Fe | Bal | Bal | Bal |
| C | 0.07 | 0.03 | 0.015 |
Mechanical Properties
| Property | Alloy 20 | Alloy 28 | Alloy 31 |
|---|---|---|---|
| Tensile (MPa) | 551 min | 500-750 | ≥650 |
| Yield (MPa) | 241 min | ≥220 | ≥280 |
| Elong (%) | 30 | ≥35 | ≥40 |
| Density (g/cm³) | 8.1 | 8.0 | 8.05 |
Applications & Benefits
- Alloy 20: Sulfuric acid storage tanks, pharma heat exchangers (Carpenter 20 foil), ASTM B463 foil for SO2 scrubbers
- Alloy 28: Wet phosphoric evaporators (Sanicro 28 foil), sour gas wells (UNS N08028), seawater exchangers vs 904L
- Alloy 31: Chlorine dioxide pulp mills, marine ship diesel scrubbers (UNS N08031), HPAL plants (Nicrofer 3127 hMo)
- Common: Gaskets/shims for chemical fertilizer, mineral processing (ASTM B625 Alloy 31 shim sheets)
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
Alloy 20, 28, 31 foils from Aurico Alloys LLP provide targeted corrosion defense for chemical tanks, phosphoric plants, marine scrubbers, and power scrubbers superior to 904L/Hastelloy at optimal economics. Partner with our trusted supplier for UNS N08020/N08028/N08031 shim stock and custom foils.
Will your next aggressive acid project leverage the power of Alloy 20, 28, 31 foils?