We are Riddhi Siddhi Impex, a Mumbai-based supplier and stockist of Alloy 20 Coils, established in 2002. We stock this niobium-stabilised nickel-iron-chromium alloy to ASME SB-463 in 0.03 mm to 5 mm gauges, while the width is slit to ±0.1 mm tolerance in-house. Our ISO 9001, 14001, and 45001-certified company carries a supply capacity of 400-500 tonnes monthly and ships with EN 10204 Type 3.1 / 3.2 certificates on request.
Alloy 20 coils are flat-rolled lengths of an austenitic nickel-iron-chromium alloy, wound for slitting and continuous fabrication. Nickel at 32.0 to 38.0% provides excellent resistance to chloride stress corrosion cracking. Copper and molybdenum carry the grade through sulphuric acid, the duty for which it was developed. Niobium, added at a minimum of eight times the carbon content, minimises chromium carbide precipitation, so welded process equipment resists intergranular attack without post-weld treatment. These coils are typically used in chemical storage tanks, pickling equipment, heat exchangers, and pharmaceutical piping networks.
As a reliable Alloy 20 coils supplier, we leverage our expansive inventory to deliver custom-processed materials rapidly, drawing source coils from premium primary mills and slitting any width between 3 mm and 2000 mm. The coil form ships annealed only; no hardness ladder applies. Buyers choose from four finishes and three edge options, and a test certificate covers every dispatch.
We provide ASME SB-463 coils of UNS N08020 in annealed mill condition, slit to width from ready stock in hot rolled and cold rolled forms.
| Parameter | Details |
|---|---|
| Standard | ASME SB-463 / ASME SB-463 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Coil ID | 150 mm to 610 mm |
| Coil OD | Up to 1800 mm |
| Condition | Annealed (Soft) |
| Surface Finish | 2B, BA (Bright Annealed), Matte, Matte PVC |
| Supply form | Hot rolled, Cold rolled |
| Edge | Slit edge, Mill edge, Deburred edge |
Copper is the signature element. N08020 coils pair 3.0 to 4.0% copper with 2.0 to 3.0% molybdenum to blunt sulphuric acid across most concentrations. Full ASME SB-463 limits appear below.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 32.0 to 38.0 |
| Chromium (Cr) | 19.0 to 21.0 |
| Iron (Fe) | Balance |
| Copper (Cu) | 3.0 to 4.0 |
| Molybdenum (Mo) | 2.0 to 3.0 |
| Niobium + Tantalum (Nb+Ta) | 8×C min, 1.00 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Carbon (C) | 0.07 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.035 max |
Annealed N08020 coil meets a 551 MPa minimum tensile strength with 30% elongation, so it presses and draws cleanly. Yield minimums apply from 0.51 mm; thinner gauges stay indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
551 MPa (80 ksi) |
|
Yield Strength (0.2% offset), minimum
|
241 MPa (35 ksi) |
|
Elongation in 50 mm, minimum
|
30% |
International buyers can cross-reference N08020 coils, also traded as Carpenter 20 or Alloy 20Cb-3, against their regional designation below. Our N08020 coils cross-reference to the regional designations below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N08020 |
| Europe (EN) | NiCr20CuMo |
| Germany (W.Nr.) | 2.4660 |
| AFNOR / NF | Z2 NCDU 31-20AZ |
| Cast equivalent (ACI) | CN7M |
These 4 industries specify most of the Alloy 20 coils we slit. Each buys the grade for acid resistance, stabilised welds, or freedom from chloride cracking rather than for strength.
Acid plants form Alloy 20 coil into pickling-tank linings, dip tubes, and agitator cladding for sulphuric and phosphoric acid duty. The copper-molybdenum chemistry stays passive where standard austenitic stainless dissolves, and niobium stabilisation keeps welded seams sound through years of hot acid exposure.
Hygienic-plant fabricators press these coils into mixing components, heat exchanger strip, and CIP circuit parts. Acidic intermediates and hot cleaning chemistry cycle through such lines daily. The stabilised austenitic structure keeps surfaces from shedding corrosion products, so batch purity holds from one campaign to the next.
Power stations specify UNS N08020 coil for flue gas scrubber internals and acid-condensate ducting. Wet sulphur dioxide condensate corrodes ordinary grades quickly at dew point. Alloy 20 handles both the reducing and oxidising sides of that service, and slit widths feed exchanger fin and tube-wrap lines directly.
Refinery units handling alkylation acid and sour condensate take the remaining volume. Fabricators cut valve diaphragm and gasket stock from 20Cb-3 coil because the grade resists the acids formed in processing. High nickel content also resists chloride stress corrosion cracking in overhead systems
As an Alloy 20 coils 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 |
| Custom Marking | Available on request |
Alloy 20 coils in India are typically priced around ₹1,300 to ₹1,800 per kg, while export buyers generally pay about $15 to $23 per kg. The rate tracks the nickel market, and thickness, width, finish, and quantity all move it. Wholesale and bulk orders earn volume discounts; call or WhatsApp us for today's rate.
Alloy 20 coils are covered by ASME SB-463, which sets the chemistry and mechanical minimums for UNS N08020 plate, sheet, and strip; coils are the wound delivery form.
Yes, Alloy 20 coils are suitable for sulphuric acid service; the grade was developed for that duty. The nickel-chromium-copper-molybdenum balance resists both dilute and concentrated acid at ambient and moderate temperatures.
The difference between hot rolled and cold rolled Alloy 20 coils lies in gauge and surface. HR coils arrive in heavier gauges with a duller skin. CR coils hold tighter thickness control and carry 2B or BA finishes in thinner gauges.
We supply Alloy 20 coils with an inner diameter of 150 mm to 610 mm and an outer diameter up to 1800 mm. Coil weight follows your handling limit.
The price of Alloy 20 coils per kg is around ₹1,300 to ₹1,800 in India, or $15 to $23 for export buyers. Final figures move with thickness, width, finish, quantity, and current nickel rates.
You can source alloy 20 coils from Riddhi Siddhi Impex. We offer Alloy 20 coils in India. Our Mumbai warehouse has N08020 coil for rapid shipment. Quotes will be provided within 24 hours. Contact us via phone or WhatsApp.
