We are Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier of Stainless Steel 317L Foils, established in 2002. Our slitting lines convert UNS S31703 stock to ASTM A240 / ASME SA-240 in gauges from 0.03 mm to 0.08 mm. As an ISO 9001, 14001, and 45001 certified company, we keep a ready inventory, export to 60+ countries, and issue EN 10204 Type 3.1 / 3.2 certificates on request.
Stainless Steel 317L foils are ultra-thin flat stock rolled from a low-carbon austenitic grade carrying 3.0 to 4.0% molybdenum. This higher molybdenum content, a full percentage point above 316L, prevents chloride pitting and sulphuric acid attack even in foil only hundredths of a millimetre thick. Chromium at 18.0 to 20.0% and nickel at 11.0 to 15.0% keep the structure austenitic and non-magnetic, while a 0.030% carbon ceiling protects welded foil seams from sensitisation.
As a reliable supplier of Stainless Steel 317L Foils, we slit every 317L foil in-house rather than trading fixed mill widths. Stainless Steel Foils leave annealed soft, since the grade carries no temper ladder, in widths from 3 mm to 2000 mm at ±0.1 mm. BA, 2B, Matte, and Matte PVC surfaces cover gasket, diaphragm, and lining work.
We provide ASTM A240 Type 317L foil in the annealed soft condition, slit on our own lines, with four surface finishes and edge options listed below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 0.08 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Supply Form | Cold Rolled (CR) |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Every advantage 317L holds over 316L starts with molybdenum. At 3.0 to 4.0%, it anchors the passive film against acidic chlorides, and ASTM A240 fixes the remaining limits for SS 317L below.
| 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) | 18.0 to 20.0 |
| Nickel (Ni) | 11.0 to 15.0 |
| Molybdenum (Mo) | 3.0 to 4.0 |
| Iron (Fe) | Balance |
| Nitrogen (N) | 0.10 max |
Annealed Stainless Steel 317L foil stretches 40% minimum, so it winds, folds, and draws into convolutions without cracking. The grade ships annealed only; density is near 7.99 g/cm³. Treat figures below 0.38 mm as indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
515 MPa (75 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Elongation in 50 mm, minimum
|
40% |
|
Hardness, maximum
|
217 HBW / 95 HRB |
Purchase orders written to European, Japanese, Chinese, or Russian codes cross-match our AISI 317L foil stock through the table below. Each designation names the same low-carbon molybdenum analysis.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31703 |
| USA (AISI) | 317L |
| Europe (EN) | X2CrNiMo18-15-4 |
| Germany (W.Nr) | 1.4438 |
| Japan (JIS) | SUS 317L |
| China (GB) | 022Cr19Ni13Mo3 |
| Russia (GOST) | 03Х16Н15М3 |
These 3 industries specify most of the 317L foil we supply. A foil section leaves no corrosion allowance, so each buyer pays the molybdenum premium to keep a passive surface at the thinnest gauges.
Flue-gas desulphurisation contractors specify thin-wall 317L SS foil linings for absorber internals, mist eliminator frames, and duct joints. A facing only hundredths of a millimetre thick corrodes through or holds; the 3.0 to 4.0% molybdenum decides which, and it keeps the joint tight between plant turnarounds.
Instrument builders form Alloy 317L Foils into diaphragms, bellows, and sensor laminations for transmitters on chloride-bearing process streams. Soft annealed stock takes deep convolutions without tearing. The austenitic structure stays non-magnetic through forming, which protects flow and pressure readings from drift over the instrument's life.
Flue-gas desulphurisation contractors specify thin-wall 317L SS foil linings for absorber internals, mist eliminator frames, and duct joints. Scrubber condensate pairs chlorides with dilute sulphuric acid. A bonded foil lining restores a passive surface over existing steelwork at a fraction of the weight and cost of a replacement plate.
Foil coils travel boxed in timber or strapped to pallets, dispatched with export papers from two warehouses.
| 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 317L Foils price in India runs around ₹255 to ₹450 per kg, roughly $3.72 to $5.00 per kg for export buyers. Foil gauges carry the highest rolling premium in the 317L family, and molybdenum surcharges move the base. Figures are indicative; call or WhatsApp us for a firm rate.
SS 317L foils roll down to 0.03 mm on our lines, and the range extends to 0.08 mm.
Gasket makers choose 317L foil because its 3.0 to 4.0% molybdenum resists pitting in acidic chloride service, where a 316L winding, at 2.0 to 3.0% molybdenum, perforates first. The thinner the facing, the more that margin matters.
Yes, 317L SS foils suit diaphragm duty. Annealed material forms deep convolutions at 40% minimum elongation, and the 0.030% carbon cap keeps welded diaphragm edges free of intergranular attack.
Available options are BA (Bright Annealed), 2B, Matte, and Matte PVC, with slit, mill, deburred, or round edges. Deburred edges suit gasket winding.
You can buy Stainless Steel 317L Foils in India from us at Riddhi Siddhi Impex, a manufacturer, supplier, and exporter since 2002. Material leaves Mumbai or Taloja in 4 to 5 days, 2 to 3 urgent orders, and every enquiry gets a quote within 24 hours.
