Electric Heating Elements
Heating-element makers use Alloy 840 strips as sheathing for tubular and cartridge heaters. The strip forms and welds readily, then holds a protective oxide at red heat, so the element keeps its shape in service.
What are Incoloy 840 Strips?
Incoloy 840 strips are thin cold-rolled strips manufactured from a titanium and aluminium-bearing iron-nickel-chromium alloy. The alloy has a 20Ni-20Cr-type austenitic matrix with iron as the balance. The titanium and aluminium form a tight oxide scale that resists scaling far better than plain 18-8 stainless, so the alloy offers oxidation resistance in air up to around 1038°C (1900°F). Incoloy 840 strips are commonly used as the outer protective sheath for high-temperature electrical heating elements in household appliances, industrial immersion heaters, refrigerator defrost systems, and automotive exhaust sensors.
We, as a reliable Incoloy 840 strip supplier, process every Alloy 840 winding strip in-house on our own slitting lines. Material is supplied in the annealed (soft) condition, slit to any width from 3 mm to 2000 mm. A mill test certificate ships with every order.
Specifications of Incoloy 840 Strips
We provide Incoloy 840 slitting coil in the annealed condition, from 0.03 mm to 5 mm thick and precision-slit to widths from 3 mm to 2000 mm, with a choice of surface finishes and edges.
| Parameter | Details |
|---|---|
| Standard | Alloy specification (S33400); ASTM A240 requirements where applicable |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm on narrow slit widths |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Chemical Composition of Incoloy 840 Strips
Chromium and nickel define this grade in near-equal measure. UNS S33400 strip holds chromium for scale resistance and nickel for stability, with titanium and aluminium strengthening the oxide. The composition below follows the alloy producer specification; because this grade is proprietary, exact limits should be confirmed against the mill test certificate.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 18.0 to 20.0 |
| Nickel (Ni) | 19.0 to 21.0 |
| 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 |
Mechanical Properties of Incoloy 840 Strips
Annealed Alloy 840 strip pairs a tensile strength of around 572 MPa with about 40% elongation, so it forms into heater sheaths readily. The values below are typical room-temperature properties and may vary with thickness and heat-treatment condition; they should be confirmed from the mill test certificate.
| Property | Value |
|---|---|
|
Tensile Strength (typical)
|
572 MPa (83 ksi) |
|
Yield Strength (0.2% offset, typical)
|
241 MPa (35 ksi) |
|
Elongation in 50.8 mm (2 in.), typical
|
40% |
|
Hardness (typical)
|
70 HRB |
|
Density
|
7.92 g/cm³ |
Equivalent Grades of Incoloy 840 Strips
International buyers can cross-reference Alloy 840 strip against the designations below. UNS S33400 is the primary designation; the W.Nr 1.4847 pairing is widely cited by mills but should be confirmed against the mill certificate, and no confirmed JIS equivalent exists.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S33400 |
| Germany (W.Nr) | 1.4847 |
Industrial Applications of Incoloy 840 Strips
These are the applications that consume most of the Incoloy 840 strips we slit. Buyers select the grade for its high-temperature scaling resistance, formability, and the tight oxide it forms on annealing.
Automotive Emission Control
Exhaust-component fabricators specify Incoloy 840 strips for emission control hardware exposed to hot, oxidising gas. The chromium and nickel resist the hot exhaust gas, and the soft strip rolls into shields and connectors.
Furnace and Heat-Treatment Equipment
Furnace builders fit Alloy 840 strips into muffle liners, radiant sections, and expansion joints under continuous heat. The grade offers strong oxidation resistance at elevated temperature, and custom-slit widths line each component without trimming.
Petrochemical and Process Heating
Process-plant fabricators apply Alloy 840 strips in heater internals and thermal processing parts. The alloy holds its oxidation resistance to around 1038°C, and precision-slit strip suits baffles and seals.
Shipping & Packaging
Export orders leave Mumbai and Taloja, packed 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 standard; Type 3.2 on request |
Incoloy 840 Strips Price
At Riddhi Siddhi Impex, we price each order according to your thickness, width, finish, and quantity against current alloy rates. Call or WhatsApp for today's rate.
Why Choose Riddhi Siddhi Impex?
Fast delivery
Best Quality
Availability of all materials
Frequently Asked Questions
What is the UNS designation for Incoloy 840 Strips?
Incoloy 840 strips carry the UNS designation S33400. The German Werkstoff Number 1.4847 is widely cross-referenced to this grade, though it should be confirmed against the mill certificate.
What thickness and width ranges are available for Incoloy 840 Strips?
We slit Incoloy 840 strips from 0.03 mm to 5 mm thick and to any width from 3 mm to 2000 mm, held to ±0.1 mm on narrow slit widths. Gauge, width, and finish follow your order.
What are Incoloy 840 Strips used for?
Incoloy 840 strips are used mainly for electric heating-element sheathing, automotive emission control hardware, furnace components, and process heating parts, since the grade resists scaling at high temperature.
What is the difference between Incoloy 840 and Incoloy 800 Strips?
Incoloy 800 contains a significantly higher nickel level, while Incoloy 840 is a titanium and aluminium-bearing 20Cr-20Ni heat-resisting alloy designed for scaling resistance. Alloy 840 is chosen chiefly where high-temperature oxidation resistance matters.
Can Incoloy 840 Strips be precision slit to custom widths?
Yes, we precision-slit Incoloy 840 strips to any width from 3 mm to 2000 mm on our own lines, holding ±0.1 mm on narrow widths. Custom slitting is our core service.
What is the typical lead time for Incoloy 840 Strip orders?
Standard dispatch runs 4 to 5 days from ready stock, and urgent orders can leave in 2 to 3 days. We hold Alloy 840 strip inventory to keep delivery quick.
Where can I source Incoloy 840 Strips in India?
You can source Incoloy 840 strips in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds Alloy 840 strip in stock for immediate dispatch. As a manufacturer, stockist, and exporter, we serve buyers across India and overseas. WhatsApp us for a quote within 24 hours.