We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 904L Coils supplier and stockist, established in 2002. We stock UNS N08904 super austenitic coils to ASTM A240 / ASME SA-240 in 0.03 mm to 5 mm gauges and slit them in-house to ±0.1 mm. Our ISO 9001, 14001, and 45001-certified company carries a monthly supply capacity of 400-500 tonnes and provides EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 904L Coils are flat-rolled strip wound for slitting and downstream fabrication, made from a super austenitic grade carrying 23 to 28% nickel, 19 to 23% chromium, 4 to 5% molybdenum, and 1 to 2% copper. That chemistry was worked out for dilute sulphuric acid duty, and it pushes the pitting resistance number close to 35. Fabricators press, form, and weld the coil into equipment that faces acids and chlorides too harsh for 316L.
As one of the most reliable 904L Stainless Steel Coil suppliers, we buy these coils from reputed primary mills rather than rolling them ourselves, then slit any width from 3 mm to 2000 mm on our own lines. Material leaves annealed to ASTM A240 across four surface finishes, and a mill test certificate accompanies dispatch on request.
We provide ASTM A240 904L Coils in annealed mill condition from ready stock, slit to your exact width, with four surface finishes, four edge options, and hot rolled or cold rolled supply routes.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| 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 (standard mill) |
| Surface Finish | BA (Bright Annealed), 2B, Matte, No.1 (HR Pickled) |
| Supply Forms | Hot rolled (HR), Cold rolled (CR) |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Nickel at 23.0 to 28.0% holds the structure fully austenitic in reducing acids, while the copper addition keeps UNS N08904 coils passive in sulphuric service that strips ordinary stainless bare.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.020 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.035 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 19.0 - 23.0 |
| Nickel (Ni) | 23.0 - 28.0 |
| Molybdenum (Mo) | 4.0 - 5.0 |
| Copper (Cu) | 1.0 - 2.0 |
| Nitrogen (N) | 0.10 max |
Annealed 904L stainless steel coils give 490 MPa minimum tensile strength alongside 35% elongation, so slit strip draws and folds without cracking. The grade accepts no hardening heat treatment; every coil ships solution annealed to ASTM A240.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
490 MPa (71 ksi) |
|
Yield Strength (0.2% offset), minimum
|
220 MPa (31 ksi) |
|
Elongation in 50 mm, minimum
|
35% |
|
Hardness, maximum
|
90 HRB |
International buyers can order AISI 904L coils against any regional designation listed here. Every entry points to the same 25Ni-4.5Mo-Cu super austenitic stainless steel.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N08904 |
| Europe (EN) | X1NiCrMoCu25-20-5 |
| Germany (W.Nr) | 1.4539 |
| Japan (JIS) | SUS904L |
| Sweden (SS) | 2562 |
These 4 industries specify most of the Alloy 904L coils we hold. Acid resistance drives the selection in each case, with chloride pitting resistance a close second.
Sulphuric and phosphoric acid plants specify 904L coil into heat exchanger strip, acid cooler components, and vessel linings. In dilute sulphuric concentrations that perforate 316L within months, the copper-bearing alloy holds its passive film, so fabricated equipment runs full campaigns between inspections rather than failing early.
Hygienic plants choose EN 1.4539 coils for process vessels, mixer bodies, and contact surfaces washed daily with caustic and chloride clean-in-place chemistry. Carbon capped at 0.020% protects weld seams from sensitisation, and the stable austenitic structure sheds no corrosion products into the batch.
Offshore separators, amine units, and desalination evaporators expose metal to hot brine and produced water heavy in chlorides. 904L SS coils resist the chloride stress corrosion cracking that retires standard austenitics from this duty. Research on the grade also confirms strong toughness at cryogenic temperatures, which interests LNG fabricators.
Bleach plants circulate chlorine dioxide and hot, acidic filtrates that chew through 316 hardware every shutdown. Mills form SS904L coils into washer components, tower internals, and digester fittings because the grade survives these stages without stepping up to a costlier 6Mo alloy.
Coil orders leave from our Mumbai and Taloja warehouses in export-ready wooden cases or on pallets.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW |
| Dispatch Points | Mumbai and Taloja warehouses |
| Port | Mumbai |
| 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 |
904L Stainless Steel Coil price in India sits around ₹250-₹500 per kg, or $2.6-$5.3 per kg for export buyers. The band is indicative only; nickel, molybdenum, and copper surcharges move it, and thickness, width, finish, and order quantity set the final figure. Call or WhatsApp us for today's rate.
We stock Stainless Steel 904L coils from 0.03 mm to 5 mm thick and slit widths from 3 mm to 2000 mm, held to ±0.1 mm tolerance.
Stainless Steel 904L Coils are not magnetic. The 23 to 28% nickel content keeps the grade fully austenitic, and it stays essentially non-magnetic even after cold rolling.
The standard covering SS 904L coils is ASTM A240 / ASME SA-240 for flat-rolled products. We back every dispatch with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
904L coils can be slit on our in-house lines to any width between 3 mm and 2000 mm at ±0.1 mm. Send us your width, thickness, and quantity for a quote.
We dispatch UNS N08904 coil orders in 4 to 5 days from ready stock, including custom-slit widths. Urgent requirements go out in 2 to 3 days.
You can source Stainless Steel 904L Coils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds N08904 coil stock for immediate dispatch, and we export worldwide as a supplier, stockist, and dealer. Phone or WhatsApp us; get a quote within 24 hours.
