We are Riddhi Siddhi Impex, an ISO 9001, ISO 14001, and ISO 45001-certified Mumbai-based stainless steel coils supplier and stockist established in 2002. We stock hot rolled and cold rolled coils to ASTM, ASME, and AMS standards from reputed primary mills, slit to a width between 3 mm and 2000 mm. We maintain a ready inventory, a monthly supply capacity of 400-500 tonnes per month, and dispatch within 4 to 5 days to keep projects on schedule.
Stainless steel coils are continuous lengths of flat-rolled steel wound after hot or cold rolling. Fabricators uncoil and blank them on presses and roll formers. Chromium above 10.5% builds a self-repairing oxide layer, so finished parts resist rust without any coating. Coil feed also cuts material waste against the cut sheet, because every blank nests along one continuous rolled length.
Our stock covers austenitic, ferritic, and martensitic coil grades - 15 grades in total. Hot-rolled coils run from about 2 mm to 5 mm. Cold-rolled coils run from 0.03 mm upward (precision strip thinner on request). The warehouse holds around 1000 tonnes of ready stock on hand, and every full-width coil arrives with mill documentation before slitting or dispatch. Buyers can order full source coils or slit widths from the same stock.
We maintain a ready stock of 15 coil stainless steel grades. Each grade has its own qualities and benefits.
Austenitic grades form the bulk of our coil inventory and cover general fabrication, chemical, and elevated-temperature duties.
Stainless Steel 301 Coils work-harden quickly during forming, which suits springs and clips needing extra strength.
View gradeStainless Steel 304 Coils are very common and popular. Corrosion resistance comes balanced with formability and price.
View gradeThis low-carbon variant welds without carbide precipitation, so fabricators choose it for welded tanks and vessels.
View gradeHeat sets this grade apart. Stainless Steel 309 Coils resist scaling in furnace equipment.
View gradeFurnace linings and radiant tubes rely on Stainless Steel 310S Coils for sustained high-temperature service.
View gradeMolybdenum lifts chloride resistance in Stainless Steel 316L Coils. Low carbon keeps welds free of sensitisation.
View gradeHigher molybdenum pushes Stainless Steel 317L Coils into harsher chemical and scrubber duties.
View gradeTitanium stabilisation allows Stainless Steel 321 Coils to resist intergranular corrosion after welding or long heat exposure.
View gradeNiobium performs the same stabilising role in Stainless Steel 347 Coils. Power and refinery plants weld them for service at a temperature.
View gradeCopper additions alongside high nickel and molybdenum content carry Stainless Steel 904L Coils through severe sulphuric acid service.
View gradeFerritic grades contain little nickel, which keeps their cost steady; we hold four.
Exhaust systems consume most Stainless Steel 409 Coils we sell, due to moderate corrosion resistance at a low cost.
View gradeAppliance fronts and interior trim lean on Stainless Steel 430 Coils. Formability and a bright rolled surface drive the choice.
View gradeTitanium additions make Stainless Steel 439 Coils weldable for exhaust and heat exchanger work without losing corrosion performance.
View gradeDual stabilisation lets Stainless Steel 441 Coils hold weld integrity at exhaust temperatures.
View gradeMartensitic grades transform under heat treatment, trading some corrosion resistance for hardness and wear performance.
We offer surface finishes across hot rolled and cold rolled coils; the rolling route decides which applies.
BA
Bright annealing preserves a mirror-like surface, preferred for appliances and decorative panels.
2B
Cold rolling with annealing and pickling produces the smooth, slightly reflective 2B surface. Most CR SS coils ship this way.
No. 4
This brushed texture doesn't show fingerprints or scratches, so kitchen equipment makers specify it widely.
Matte
Matte finish keeps glare down. Appliance makers use it where low gloss matters.
The majority of stainless steel coils dispatched from our warehouses serve 3 primary industrial sectors. Grade choice follows the corrosion environment and forming route.
Most vehicle exhaust systems begin as a stainless steel slit coil, along with heat shields and trim sections. Ferritic grades handle repeated heat cycling at reasonable cost, while trim and brightwork use Stainless Steel 430 Coils.
Dairies and commercial kitchens build tanks, counters, and conveyors from Stainless Steel 304 Coils. The grade cleans easily and tolerates daily washdown chemistry. Where brines and stronger cleaners contact the surface, buyers step up to Stainless Steel 316L Coils. A 2B or No.4 brushed finish suits food-contact surfaces.
Process plants specify coil for reactor cladding and scrubber internals. Molybdenum-bearing grades earn their place here: Stainless Steel 316L Coils resist chloride-bearing streams, and Stainless Steel 317L Coils take harsher scrubber duty. We hold both grades in ready stock for quick replacement during plant shutdowns.
Quality documentation backs every dispatch. Riddhi Siddhi Impex maintains three ISO certifications alongside mill-level traceability.
Every coil carries an EN 10204 Type 3.1 mill test certificate traceable to the mill heat. Type 3.2 available on request.
Our ISO 9001:2015 certification confirms a consistent quality management system across our supply operations.
ISO 14001:2015 covers our environmental management. It governs everything from storage through material movement.
Workplace safety runs under ISO 45001:2018, covering occupational health across our warehouse and slitting operations.
Flat-rolled stainless coils fall under HS heading 7219 when 600 mm or wider and 7220 below that width. Confirm the final subheading with your customs broker.
Yes, stainless steel coils are our fastest moving grade and stay in stock year round. Standard dispatch takes 4 to 5 days. Urgent orders leave within 2 to 3 days.
Riddhi Siddhi Impex stocks SS coils in Mumbai for buyers across India and abroad, and has done so since 2002. Call or WhatsApp our team and you'll have a quote within 24 hours.
