We are Riddhi Siddhi Impex, a Mumbai-based Alloy 20 Foils manufacturer and supplier, established in 2002. We slits ASME SB-463 copper-bearing, niobium-stabilized nickel alloy for thicknesses of 0.03 to 0.08 mm. Certified to ISO 9001, 14001, and 45001, we offer global shipping with EN 10204 3.1/3.2 certificates on request and our monthly supply capacity is 400-500 tonnes.
Alloy 20 foils are thin, flat-rolled products of an austenitic nickel-iron-chromium grade, listed in trade catalogues as Alloy 20Cb-3. Copper at 3.0 to 4.0% gives the alloy its footing in sulphuric acid, the duty it was designed around. Molybdenum adds pitting resistance; chromium handles oxidising media. Niobium ties up carbon, so welded parts resist intergranular attack, and 32.0 to 38.0% nickel provides excellent resistance to chloride stress corrosion cracking. Alloy 20 foils are typically used in chemical storage tanks, pickling equipment, heat exchangers, and pharmaceutical piping networks.
As a reliable alloy 20 foil supplier, every 20Cb-3 foil we offer is slit in-house on our own lines. Foils leave annealed soft to ASME SB-463, in any width from 3 mm to 2000 mm, with three surfaces and four edge options. EN 10204 certificates (available on request) document each batch from source coil to dispatch.
We provide ASME SB-463 Foils in annealed soft condition, precision-slit from 0.03 mm to 0.08 mm thick and 3 mm to 2000 mm wide, in coils.
| Parameter | Details |
|---|---|
| Standard | ASME SB-463 |
| Thickness | 0.03 mm to 0.08 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Matte |
| Supply Form | Cold-rolled |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Copper does the real work in this grade. UNS N08020 foil carries 3.0 to 4.0% of it, enough to see the material through hot sulphuric acid. ASME SB-463 limits follow.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.07 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.035 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 19.0 to 21.0 |
| Nickel (Ni) | 32.0 to 38.0 |
| Molybdenum (Mo) | 2.0 to 3.0 |
| Copper (Cu) | 3.0 to 4.0 |
| Niobium + Tantalum (Nb+Ta) | 8×C min, 1.00 max |
| Iron (Fe) | Balance |
Annealed Nickel Alloy 20 foils meet a 551 MPa tensile minimum under ASME SB-463. The standard drops its yield requirement below 0.51 mm, so thinner N08020 foils carry indicative figures, certified per order.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
551 MPa (80 ksi) |
|
Yield Strength (0.2% offset), minimum
|
241 MPa (35 ksi) |
|
Elongation in 50 mm, minimum
|
30% |
|
Density (typical)
|
8.05 g/cm³ |
Procurement teams that know the grade as 20Cb-3 foils or W.Nr 2.4660 can match their purchase specification against each regional designation below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N08020 |
| Europe (EN) | NiCr20CuMo |
| Germany (W.Nr.) | 2.4660 |
| Cast equivalent (ACI) | CN7M |
These 4 industries account for most of the Nickel Alloy 20 foils we slit. Each buys the grade for acid resistance at thin gauge rather than for strength alone.
Acid-dosing skids, gasket faces, and instrument diaphragms in sulphuric and phosphoric service run on Alloy 20 foil. Pharmaceutical plants add clean-in-place chemistry to that load, and the stabilised structure comes through repeated hot washes intact. Where ordinary stainless pits within months, this grade keeps sealing faces serviceable for years.
Food and dairy machinery builders line contact surfaces and form thin sealing parts from Nickel Alloy 20 foils. Hot acidic cleaning agents circulate through these plants daily. The alloy doesn't pit or leach under that cycle, so product purity holds and inspection intervals stretch out.
Alloy 20 shim foils sit between tubesheets, inside vessel linings, and behind gasket windings in exchangers moving hot acidic media. One material covers reducing and oxidising duties alike, which trims a fabricator's stocking list. Foil slit to ±0.1 mm seats directly, no site trimming needed.
Flue gas desulphurisation is the power sector's main call for this grade. Scrubber seals and acid-service ducting collect wet condensate rich in sulphur compounds. Copper counters those reducing acids; the high nickel base provides excellent resistance to chloride stress corrosion cracking.
As an Alloy 20 foils exporter, we dispatch from Mumbai and Taloja in wooden cases or on pallets.
| 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 |
Alloy 20 Foils price in India runs around ₹1,200 to ₹2,100 per kg, roughly $13 to $22 for overseas buyers. Treat the range as indicative; nickel market movement, thickness, width, finish, and quantity all shift any price list. Bulk and wholesale orders earn volume discounts, so call or WhatsApp us for today's rate.
We slit Alloy 20 foils from 0.03 mm to 0.08 mm thick, in any width between 3 mm and 2000 mm. Alloy 20 shim foils occupy the thinner 0.03 to 0.0.08 mm end of that range.
Yes, Alloy 20 foils can be custom slit to any width from 3 mm to 2000 mm on our in-house lines, held to ±0.1 mm, with slit, mill, deburred, or round edges.
Yes, Alloy 20 foils suit sulphuric acid service; the grade was developed for precisely that duty. Copper at 3.0 to 4.0% carries it through a broad band of acid concentrations.
The typical delivery lead time for Alloy 20 foils is 4 to 5 days, ex-stock or custom slit. Urgent requirements dispatch in 2 to 3 days from Mumbai or Taloja.
The UNS designation for Alloy 20 foils is N08020. European buyers list the same material as W.Nr 2.4660 or NiCr20CuMo, and the trade shorthand is 20Cb-3.
You can source Alloy 20 foils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse keeps N08020 foil ready for dispatch, and as an alloy 20 foil manufacturer, supplier, stockist, and distributor we serve buyers nationwide and export overseas. Phone or WhatsApp us; we will provide quotations within 24 hours.
