We are Riddhi Siddhi Impex, a Mumbai-based Incoloy 840 Foils manufacturer and supplier, established in 2002. We slit foil from this titanium and aluminium-bearing 20Cr-20Ni heat-resisting austenitic alloy in gauges from 0.03 mm to 0.08 mm. Our ISO 9001, 14001, and 45001-certified company carries ready stock, with a supply capacity of 400-500 tons monthly, and EN 10204 Type 3.1 / 3.2 certificates on request.
Incoloy 840 foils are thin, precision-rolled sections of a heat-resisting nickel-iron-chromium alloy that pairs 20% chromium with 20% nickel plus titanium and aluminium additions on an iron base. Those additions bind the oxide into a tight, adherent scale, so the foil resists scaling in air to about 1038°C. The grade is widely used for heating-element sheathing, and the thin foil conforms to tight radii and complex geometries that heavier strip cannot accommodate.
As a reliable Incoloy 840 supplier, we process this specialised Inconel foil on our own in-house slitting lines rather than pulling pre-cut sizes from a reseller's shelf. Material ships in annealed soft condition, slit to any width from 3 mm to 2000 mm, with a mill test certificate included in each consignment.
We provide Incoloy 840 foils in annealed condition, rolled down to 0.03 mm and precision-slit to widths from 3 mm to 2000 mm, in several finishes and edges.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 |
| 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, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
| Supply Forms | Cold Rolled |
Matched chromium and nickel bands define this grade. UNS S33400 foil carries 18.0 to 22.0% of each, with titanium and aluminium anchoring the protective scale. Values follow the alloy producer specification.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 18.0 to 22.0 |
| Nickel (Ni) | 18.0 to 22.0 |
| Iron (Fe) | Balance |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Titanium (Ti) | 0.60 max |
| Aluminium (Al) | 0.60 max |
| Copper (Cu) | 0.75 max |
| Carbon (C) | 0.08 max |
| Phosphorus (P) | 0.04 max |
| Sulphur (S) | 0.015 max |
Annealed Alloy 840 foil delivers 485 MPa tensile strength with 30% elongation, so it winds and folds at thin gauge without tearing. Figures are nominal room-temperature values, indicative at the thinnest gauges.
| Property | Value |
|---|---|
|
Tensile Strength
|
485 MPa (70 ksi) |
|
Yield Strength (0.2% offset)
|
170 MPa (25 ksi) |
|
Elongation in 50 mm
|
30% |
|
Hardness
|
70 HRB |
Buyers working to a regional standard can cross-check our 840 foil against the designations below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S33400 |
| Europe (EN / Werkstoff) | 1.4847 |
These 4 industries specify most of the Incoloy 840 foils we slit. Buyers want scaling resistance at elevated temperatures in a gauge thin enough to wrap tight radii.
Heating-element makers wind Alloy 840 foil into sheathing layers for tubular and cartridge heaters. Foil gauge keeps thermal mass low, so elements heat and cool quickly. The stable oxide the grade builds at temperature holds each winding intact through repeated cycles.
In exhaust systems, fabricators layer Nickel Alloy 840 foil into heat shields and flexible connectors exposed to hot, oxidising gas. The 20Cr-20Ni matrix stands up where plain stainless foil scales away, and the soft temper follows curved shield contours.
Furnace builders fit Incoloy 840 foils as radiant screens, thermocouple protection wraps, and insulation facings under continuous heat. The grade resists oxidation, sulphidation, and carburisation.
Process fabricators apply UNS S33400 foil in heater internals, baffle facings, and thin sealing sections. Oxidation resistance holds to around 1038 °C, and precision-slit foil seats cleanly in narrow gaps.
Export orders are issued 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 |
We at Riddhi Siddhi Impex keep Incoloy 840 Foils price as per thickness and width specified. Call or WhatsApp us for current prices.
We slit Incoloy 840 foils from 0.03 mm to 0.08 mm thick and to any width between 3 mm and 2000 mm, held to ±0.1 mm.
Incoloy 840 foils carry the UNS designation S33400 and the German Werkstoff Number 1.4847.
Incoloy 840 foils are used mainly in electric heating-element sheathing, automotive emission control hardware, furnace screens, and process heating internals, wherever a thin section must resist scaling at high temperature.
The main difference between Incoloy 840 and Incoloy 800 foils is the chemistry. Alloy 840 is a titanium and aluminium-bearing 20Cr-20Ni heat-resisting stainless picked for scaling resistance, while Incoloy 800 carries more nickel for creep duty.
Yes, we custom-slit Incoloy 840 foils to any width from 3 mm to 2000 mm on our own lines, holding ±0.1 mm. Send us your exact width and gauge for a quotation.
Some of the surface finishes we offer on Alloy 840 foils are BA (Bright Annealed), 2B, and Matte. Deburred and round edge options are available for winding and gasket work.
You can source Incoloy 840 foils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds Alloy 840 foil on the shelf for immediate dispatch. As a manufacturer, stockist, and exporter since 2002, we serve buyers across India and overseas. Phone or WhatsApp us for a quote, which will be provided within 24 hours.
