We are Riddhi Siddhi Impex, a Mumbai-based Inconel 625 Foils manufacturer and supplier, established in 2002. We slit Alloy 625 foil to ASTM B443 / ASME SB-443, available in thicknesses from 0.03 mm to 0.08 mm and slit to widths held within ±0.1 mm. Our ISO 9001, 14001, and 45001-certified firm holds ready stock, a supply capacity of 400-500 tonnes monthly, and ships worldwide with EN 10204 Type 3.1 / 3.2 certificates available on request.
Inconel 625 foils are thin, cold-rolled flat products of a nickel-chromium-molybdenum-niobium alloy holding 58% minimum nickel. Chromium at 20 to 23% guards against oxidation, while 8 to 10% molybdenum and niobium stiffen the matrix in solid solution. The foil holds strength to about 980 °C and resists pitting, crevice attack, and chloride stress-corrosion cracking, so fabricators shape it into bellows, seals, and diaphragms. Inconel 625 foils are typically used for high-temperature aerospace components, industrial bellows, seals, and corrosion-resistant diaphragms.
We slit every UNS N06625 foil in-house. Our high-precision inconel foil products ship in Soft (annealed) through Full Hard temper, in widths from 3 mm to 2000 mm, with BA, 2B, or Matte surfaces. A documented quality system governs each order from source coil to dispatch.
Temper describes how much cold rolling a foil has taken after annealing, which sets its strength and how it behaves under forming. We supply Inconel 625 foil in a soft annealed condition and in cold-rolled hard tempers, each rolled to a tensile range we agree with the customer at the order stage and certify on the EN 10204 Type 3.1 mill test certificate. These cold-worked tempers are mill tempers, not conditions defined by ASTM B443, which covers only the annealed and solution annealed grades. The sections below cover the six conditions we roll and the work each one goes into.
Soft annealed foil solves the complaint we hear most about hard foil: parts that crack at the bend. The annealed foil we supply meets the Grade 1 minimum of 827 MPa tensile, with hardness reported on the certificate we issue with every coil. Our customers draw it deeply and form tight radii without splitting, shaping it into bellows, seal diaphragms, and honeycomb skins in a single pass. Where a design calls for service above 593 °C, we recommend the Grade 2 solution-annealed condition at a 690 MPa minimum, and we confirm which grade applies before we book the order.
We produce this temper with a light cold reduction that lifts tensile strength above the annealed minimum while keeping enough ductility for gentle forming. We roll it as a mill temper to the tensile range fixed at order, verified by tensile test on the certificate. It suits customers who find soft foil too slack to hold shape but know full stiffness would resist their die. We supply it for shim stock, light flat springs, and flat parts that must stay flat after blanking.
Half hard suits customers who want blanked parts to keep their edge and lie flat on the bench. We roll it with a heavier cold reduction than quarter hard and confirm the certified tensile range on the first-off certificate. Because springback rises at this level, we advise our customers to check tooling allowances against the first-off sample we send before they commit the full run. We supply it for pressure diaphragms, gasket windings, and sensor membranes where dimensional hold matters more than deep draw.
Our customers specify this condition for flat springs and stiff membranes that must resist deflection. We cold roll the foil towards the upper end of formability, to the range agreed on the order. At this hardness the foil accepts only shallow bends before it starts to fracture, so when a drawing shows a tight radius we steer the order back towards a softer temper instead. On our slitting line we interleave narrow coils with paper at this temper, since the harder surface marks easily.
When a design calls for high yield in a thin section, we roll hard temper foil to a strength range fixed against the order. Because foil cannot take a Rockwell C indent reliably at these gauges, we verify the temper by tensile test or microhardness and log the result on the mill test certificate. Forming is limited to slight contours; the metal is chosen here for stiffness, not shaping. We supply it for flat spring elements, stiffening laminates, and backing strips for seals and gaskets.
Full hard is the stiffest condition we roll, produced for flat spring stock and load-bearing seal elements. It is a mill temper, and its strength figures come from the cold reduction agreed at order. Burr behaviour changes at full hard, so we set slitting clearances tighter to keep edges clean on narrow widths. We do not supply this temper for forming work; we supply it where stiffness in a flat section is the whole requirement, and we confirm the certified tensile range with the customer before rolling.
We provide Inconel 625 Foils in six tempers, three finishes, and four edge options, precision slit and supplied in coil or cut lengths.
| Parameter | Details |
|---|---|
| Standard | ASTM B443 / ASME SB-443 |
| Thickness | 0.03 mm to 0.08 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Temper | Soft (Annealed), Quarter Hard, Half Hard, Three-Quarter Hard, Hard, and Full Hard. |
| Surface Finish | BA (Bright Annealed), 2B, Matte |
| Edge | Slit, Mill, Deburred, Round |
| Supply Form | Cold Rolled |
Niobium separates Alloy 625 foils from plain nickel-chromium grades. Paired with molybdenum, the 3.15 to 4.15% Nb+Ta addition strengthens N06625 foil without heat treatment. Full ASTM B443 limits appear below.
| Element | Composition (%) |
|---|---|
| Nickel + Cobalt (Ni+Co) | 58.0 min |
| Chromium (Cr) | 20.0 to 23.0 |
| Molybdenum (Mo) | 8.0 to 10.0 |
| Niobium + Tantalum (Nb+Ta) | 3.15 to 4.15 |
| Iron (Fe) | 5.0 max |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.015 max |
| Sulphur (S) | 0.015 max |
| Aluminium (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
| Cobalt (Co) | 1.0 max |
Annealed Inconel 625 foil meets ASTM B443 Grade 1 minimums of 827 MPa tensile, 414 MPa yield, and 30% elongation; Grade 2 is solution annealed at 690 MPa for service above 600 °C. Cold working sets the determination below; the annealed row is the standard minimum, and cold-worked rows are indicative, certified per order.
| Temper Condition | Tensile Strength (MPa) |
|---|---|
|
Soft (Annealed)
|
827 to 965 |
|
Quarter Hard
|
930 to 1100 |
|
Half Hard
|
1030 to 1240 |
|
Three-Quarter Hard
|
1170 to 1380 |
|
Hard
|
1310 to 1520 |
|
Full Hard
|
1380 to 1520 |
Buyers who know the alloy as W.Nr 2.4856 foils or NiCr22Mo9Nb can cross-reference UNS N06625 foils against regional designations below. Our stock matches every entry.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N06625 |
| Europe (EN) | NiCr22Mo9Nb |
| Germany (W.Nr) | 2.4856 |
| Japan (JIS) | NCF 625 |
| China (GB) | NS336 |
| UK (BS) | NA 21 |
These 4 industries specify most of the Nickel 625 foils we slit, chosen for corrosion resistance and strength held together at temperature.
Aerospace fabricators order Inconel 625 foil for honeycomb seal skins, bellows, and heat-shield laminates. The grade holds fatigue strength through repeated thermal cycling and resists oxidation past 900 °C. Foil slit to ±0.1 mm brazes and bonds without edge trimming, which shortens assembly time.
Spiral-wound gasket windings, expansion joint membranes, and probe sheathing in acid service run on Alloy 625 foil. Molybdenum and niobium resist pitting in hydrochloric and sulphuric streams. Stainless windings can fail within a season in hot chloride lines; 625 foil keeps sealing for years.
Seawater doesn't pit this grade easily. Offshore instrument makers choose Nickel 625 foils for pressure diaphragms, seal membranes, and splash-zone sensor housings because the alloy resists crevice corrosion and sulphide stress cracking. Thin gauges draw deeply without splitting, so complex diaphragm profiles form in one pass.
Gas turbine and boiler builders fit 625 foil into seal rings, flexible couplings, and exhaust bellows exposed to hot flue gas. Creep resistance and a stable oxide film keep parts serviceable across long outage intervals. Full Hard temper stock also serves as flat spring material.
Export orders leave Mumbai and Taloja, packed in wooden cases or on pallets, ready 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 |
Inconel 625 Foils price range in India is around ₹3,000 to ₹5,500 per kg. In the USA, it is generally $32 to $58 per kg. The figure moves with global nickel rates; thickness, temper, width, and quantity all shift it. Call or WhatsApp us for today's rate and volume discounts.
We slit Inconel 625 foil from 0.03 mm to 0.08 mm thick and to any width between 3 mm and 2000 mm, with width held to ±0.1 mm.
We offer Inconel 625 foils in six temper conditions: Soft (annealed), Quarter Hard, Half Hard, Three-Quarter Hard, Hard, and Full Hard.
The main difference between ASTM B443 Grade 1 and Grade 2 is heat treatment and strength. Grade 1 is the annealed condition with 827 MPa minimum tensile; Grade 2 is solution annealed with 690 MPa minimum tensile. Solution annealed material is generally preferred for sustained service above approximately 590 °C, where creep resistance and structural stability matter more than room-temperature strength.
625 foils are used for honeycomb seals, gasket windings, bellows, diaphragms, and heat shields across aerospace, chemical, marine, and power plants, serving up to about 980 °C.
You can source Inconel 625 foils in India from us at Riddhi Siddhi Impex. As a manufacturer, stockist, and exporter, we hold N06625 foil in Mumbai ready for dispatch and serve buyers across India and overseas. Phone or WhatsApp us; quotations are provided within 24 hours.
