We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 316L Coils supplier and stockist, established in 2002. We stock ASTM A240 / ASME SA-240 coils in thicknesses from 0.03-5 mm, precision-slit in-house. Our ISO 9001, 14001, and 45001-certified company holds ready stock and has a supply capacity of 400-500 tons monthly. We also export worldwide with EN 10204 Type 3.1 / 3.2 mill test certificates.
Stainless Steel 316L coils are continuous flat-rolled lengths of low-carbon austenitic steel, wound for feeding into presses, roll formers, and tube mills. The grade carries the designation UNS S31603. Chromium at 16.0-18.0% builds the passive oxide layer, nickel at 10.0-14.0% stabilises the austenitic structure, and 2.00-3.00% molybdenum blocks pitting in chloride media. Carbon is capped at 0.030%, so welded joints resist intergranular attack without any post-weld anneal.
We source prime stainless steel coils from reputed primary mills, hold them in ready stock, and slit each 316L stainless steel coil in-house to any width from 3 mm to 2000 mm. Material ships in annealed soft condition to ASTM A240. We hold around 1000 tonnes in ready stock at any given time across gauges, which is why standard orders leave in 4 to 5 days.
We provide ASTM A240 Type 316L coils in annealed soft condition, hot rolled or cold rolled, in eight finishes and four edge conditions, slit to your exact line width.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240, ASTM A666 |
| 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, Scotch-Brite, HR Pickled, CR, Skin Pass |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Molybdenum sets this grade apart within the 300 series. UNS S31603 coils hold 2.00-3.00% of it, which defends against pitting and crevice corrosion in chloride service.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 16.0-18.0 |
| Nickel (Ni) | 10.0-14.0 |
| Molybdenum (Mo) | 2.00-3.00 |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Annealed 316L SS coils meet 485 MPa minimum tensile strength and 40% elongation, so deep drawing and roll forming run cleanly. ASTM A240 caps hardness at 217 HBW.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
485 MPa (70 ksi) |
|
Yield Strength (0.2% offset), minimum
|
170 MPa (25 ksi) |
|
Elongation in 50 mm, minimum
|
40% |
|
Hardness, maximum
|
217 HBW / 95 HRB |
Overseas buyers can cross-reference UNS S31603 coils against their home standard below, since procurement specifications abroad rarely cite the ASTM name.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31603 |
| Europe (EN) | X2CrNiMo17-12-2 |
| Germany (W.Nr) | 1.4404 |
| Japan (JIS) | SUS 316L |
| China (GB) | 022Cr17Ni12Mo2 |
| UK (BS) | 316S11 |
| Russia (GOST) | 03Kh17N14M3 |
These 5 industries consistently rely on SS 316L coils we supply. Buyers choose the grade for weldability and chloride resistance, and coil form feeds their forming lines without intermediate cutting.
Process plants order 316L stainless steel coil for reactor linings, storage tanks, and transfer pipework cladding. Sulphuric and acetic acid streams at moderate concentrations corrode 304 equipment; molybdenum in the 316L matrix slows that damage to serviceable rates. Coil form also lets fabricators roll vessel shells with fewer welded seams.
Dairies and breweries run hot caustic cleaning cycles every day. 316L SS coils survive those washdowns without pitting, so product contact surfaces stay smooth and hygienic through years of service. Tank skins, conveyor panels, and filling machinery all use coil. A 2B or BA finish wipes clean and shows fouling early.
Pharmaceutical equipment builders specify SS316L coils for mixing vessels, cleanroom panelling, and purified water circuits. The grade tolerates repeated steam sterilisation and chloride-bearing water loops. A polished low-carbon surface meets sanitary standards and leaves no crevices where residue could gather between batches, which keeps validation records clean.
Marine Grade 316L coils are used in deck hardware, splash-zone cladding, and desalination plant internals. Salt spray destroys leaner stainless grades through pitting and crevice corrosion. With 2.00-3.00% molybdenum in the matrix, 316L withstands constant chloride exposure, and shipyards press fittings straight from coil stock as required.
Heat exchanger builders wind fins and press plates from thin-gauge 316L SS coils, often under 0.5 mm. Thermal cycling doesn't fatigue the alloy quickly. Cooling-water chlorides on the shell side would pit lesser grades, yet 316L holds up, and our slitting line cuts stock to your required strip width at ±0.1 mm..
Dispatches move from our Mumbai and Taloja warehouses in wooden cases or on pallets, sea-worthy.
| 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 |
Stainless Steel 316L coils price in India range between ₹300 and ₹500 per kg. In the USA, it is generally $3.50-$6.00/kg. Nickel and molybdenum surcharges move the figure monthly. Volume discounts apply to bulk and wholesale orders, so call or WhatsApp us for today's rate.
We stock SS 316L coils from 0.03 mm to 5 mm thick, slit to any width between 3 mm and 2000 mm at ±0.1 mm. Narrow slit coil requirements are within our stainless steel 316L strips range.
The main difference between 316 and 316L coils is carbon content: Grade 316 permits 0.08% maximum, while 316L is limited to 0.030%. Post-weld annealing isn't practical on large fabrications; the low-carbon grade holds off intergranular attack as welded.
Our 316L coils conform to ASTM A240 / ASME SA-240 as standard, and we also supply against ASTM A666. EN 10204 Type 3.1 / 3.2 mill test certificates accompany any order on request.
You can source Stainless Steel 316L coils in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds SS316L coils ready for dispatch, and our stockist and supplier roles cover pan-India supply plus export worldwide. Phone or WhatsApp us; quotes go out within 24 hours.
