We are Riddhi Siddhi Impex, a Mumbai-based supplier and stockist of Incoloy 840 Sheets & Plates, established in 2002. We hold a ready stock of this titanium and aluminium-bearing 20Cr-20Ni heat-resisting grade (Alloy 840) made to ASTM B424 and ASTM A240 in sheets from 0.8 mm and heavier plates. Our ISO 9001, 14001, and 45001-certified company carries a monthly supply capacity of 400-500 tonnes and ships worldwide with EN 10204 Type 3.1 / 3.2 certificates available on request.
Incoloy 840 sheets and plates are austenitic heat-resisting stainless steel flat products built on roughly 20% chromium and 20% nickel, with small titanium and aluminium additions and iron as the balance. The additions bind the oxide into a tight, adherent scale, so flat products resist scaling in air to about 1038 °C. Trade practice keeps the Incoloy name, though the chemistry is nearer heat-resistant stainless than the 800 series. It is commonly applied in electric heating elements and process equipment.
We stock Alloy 840 as cold-rolled sheet from 0.8 mm and hot-rolled plate from 3 mm to 2000 mm wide (after slitting). Material ships annealed with a mill test certificate upon request.
We provide Incoloy 840 sheet and plate in annealed condition, in two surface finishes and two edge options.
| Parameter | Details |
|---|---|
| Standard | ASTM B424/ ASME SB424, ASTM A240 / ASME SA240 |
| Thickness (Sheets, CR) | 0.8 mm to 6 mm |
| Thickness (Plates, HR) | 6 mm and above |
| Width (post-slitting) | 3 mm to 2000 mm |
| Condition | Annealed (standard mill condition) |
| Surface Finish | 2B, BA (Bright Annealed) |
| Edge | Mill edge, Slit edge |
| Form | Sheets, Plates |
| Supply Form | Hot Rolled and Cold Rolled |
Nickel and chromium occupy matched 18.0 to 22.0% bands in UNS S33400 flat products, while titanium and aluminium anchor the oxide.
| 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) | 0.03 max |
| Sulphur (S) | 0.015 max |
Formability is the working advantage. Annealed Nickel Alloy 840 sheet reaches 572 MPa tensile strength with 40% elongation, so it presses cleanly. The figures below are nominal room-temperature values.
| Property | Value |
|---|---|
|
Tensile Strength
|
572 MPa (83 ksi) |
|
Yield Strength (0.2% offset)
|
241 MPa (35 ksi) |
|
Elongation in 50 mm
|
40% |
|
Hardness
|
70 HRB |
Buyers working to a regional standard can match Alloy 840 sheets and plates using the table below. Unverified entries stay marked to be confirmed.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S33400 |
| Germany (W.Nr) | 1.4847 |
These 4 industries use the Incoloy 840 sheets and plates we supply. Buyers pick the grade for scaling resistance at red heat and for how readily it forms.
Heating-element producers form Alloy 840 sheet into sheathing for tubular and cartridge heaters. The metal draws, welds, and swages without cracking, then builds a stable oxide in service that keeps each element dimensionally true. Thin cold-rolled sheet in BA finish suits deep-drawn sheath tubes.
Exhaust hardware exposes flat product to hot, oxidising gas for thousands of hours. Fabricators press Incoloy 840 sheet into heat shields, flexible connectors, and converter housings because the 20Cr-20Ni matrix resists the exhaust stream. Cold-rolled gauges keep pressing tools within their normal working loads.
Furnace builders line muffles, radiant sections, and carburising boxes with Nickel Alloy 840 plate. The grade withstands oxidation, sulphidation, and carburisation under continuous heat, so liners survive repeated firing cycles.
Process plants apply Alloy 840 plate in heater internals, baffles, and thermal processing frames. Scaling resistance holds to around 1038 °C, which matches the duty inside fired heaters.
Export orders leave from Mumbai and Taloja in wooden cases or on pallets, booked for sea.
| 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 |
Incoloy 840 Sheets & Plates price ranges from INR 2,000 to 3,000. In the international markets, it reached US$40-50/kg. Each order is priced by thickness, width, finish, and quantity against current alloy rates. Send us your requirement for a firm quote.
Incoloy 840 Sheets and Plates are covered by ASTM B424/ ASME SB424, ASTM A240 / ASME SA240. Every shipment carries an EN 10204 Type 3.1 / 3.2 certificate when requested.
Incoloy 840 sheets and plates carry the UNS designation S33400 and the Werkstoff Number 1.4847.
The chemical composition of Incoloy 840 plate is 18.0 to 22.0% each of chromium and nickel, with 0.60% maximum titanium and aluminium, 0.08% maximum carbon, and iron as the balance.
The main difference is that Incoloy 840 is a titanium and aluminium-bearing 20Cr-20Ni heat-resisting stainless, while Incoloy 800 holds more nickel at 30 to 35%. Fabricators pick 840 chiefly for scaling resistance.
We supply Incoloy alloy 840 sheets from 0.8 mm to 6 mm and plates from 6 mm upward, in widths up to 2000 mm (after slitting).
The finishes available for Incoloy 840 sheets and plates 2B and BA (Bright Annealed) on the sheet.
You can source Incoloy 840 sheets and plates in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds Alloy 840 flat products for immediate dispatch. As a supplier, stockist, and exporter, we serve buyers across India and overseas. Phone or WhatsApp us; we provide quotations within 24 hours.
