We are Riddhi Siddhi Impex, an ISO 9001, ISO 14001, and ISO 45001-certified Mumbai-based Duplex Steel Sheets & Plates supplier and stockist established in 2002. We stock cold-rolled duplex sheets and hot-rolled plates to ASTM and ASME standards, sourced from reputed primary mills. We maintain a ready inventory, a monthly supply capacity of 400 to 500 tonnes, and dispatch within 4 to 5 days to keep fabrication schedules on track.
Duplex steel sheets and plates are flat-rolled stainless products with a two-phase microstructure, split near evenly between austenite and ferrite. That balance defines the family. Ferrite pushes yield strength to roughly double what 304 or 316 austenitics manage, which lets designers pull wall thickness down and save weight, along with alloy cost at the same pressure rating. Austenite contributes the toughness and weldability that plain ferritic steels lack. Chromium, molybdenum, and nitrogen in the chemistry guard against chloride pitting and against the stress corrosion cracking that forces austenitic equipment in warm brine into early retirement.
Our Mumbai and Taloja warehouses hold duplex flat products in the solution annealed condition. Cold-rolled sheet spans 3.8 mm to 6 mm; hot rolled plate takes over from 6 mm upward. Width choices run 1000 mm, 1219 mm, 1500 mm, and 2000 mm, with lengths from 2000 mm to 6000 mm cut to order. Each consignment links back to an identified mill heat, and we share the mill paperwork on request.
We supply Duplex 2205 steel sheets and plates across India, offering strong corrosion resistance, high strength, and quick, reliable dispatch.
We dispatch duplex sheets and duplex steel plates in three surface finishes; the rolling route decides which applies.
2B
Annealing and pickling, followed by a light skin pass, give 2B its faintly reflective face. Process equipment interiors specify it for cleanability.
BA
Bright annealing under a protective atmosphere preserves a near-mirror surface on a thin sheet, chosen where appearance or easy inspection matters.
HR
Hot-rolled and annealed plate with a rough, descaled surface for structural and pressure applications.
3 sectors specify most of the duplex flat products leaving our warehouses. Chloride load and service temperature decide the gauge and finish at each site.
Fabricators form reactor shells, columns, and storage tanks for warm chloride liquors from Duplex 2205 plate. Plants that watched 316 equipment crack switch to the duplex structure and run the same duty at reduced wall thickness. When a shutdown uncovers damage, material from our shelves closes the gap fast.
Separators, manifolds, and pressure vessels on offshore platforms and gas processing trains rely on Duplex 2205 plate. The grade withstands saline, sometimes sour, streams while carrying structural loads, which trims topside weight where every tonne counts.
Flash chambers, evaporator bodies, and heat exchanger shells in desalination plants run hot brine around the clock, and shipbuilders face the same chloride exposure in seawater systems. Duplex 2205 sheet keeps pitting at bay across both duties and outlasts the austenitic material it replaced.
As a reliable duplex steel plate supplier, documentation backs every duplex dispatch. Three ISO certifications stand behind our operation, and each heat we sell traces to its mill record.
An EN 10204 Type 3.1 mill test certificate accompanies every consignment, linked to the source heat. Type 3.2 with a third-party witness comes on request.
ISO 9001:2015 certifies our quality management system, from mill purchase through inward checks, storage, and final packing.
Our environmental management runs under ISO 14001:2015, governing material handling and waste routines at both warehouses.
ISO 45001:2018 covers occupational health and safety for the team handling heavy duplex plate day in, day out.
Duplex counts as stainless steel for customs classification, so sheets and plates 600 mm or wider come under HS heading 7219, and narrower flat products under 7220. Your customs broker should confirm the exact subheading before shipment.
Yes, Duplex sheets and plates stay stocked in Mumbai and Taloja all year. Standard dispatch runs 4 to 5 days, and urgent requirements leave in 2 to 3 days when the size is in stock.
Yes. Sheets span 3.8 mm to 6 mm, and plates start at 6 mm, in widths of 1000 mm, 1219 mm, 1500 mm, and 2000 mm, held to ±0.1 mm. We slit non-standard widths and lengths to your order.
You can buy Duplex Steel Sheets & Plates from Riddhi Siddhi Impex in Mumbai, where we have stocked duplex flat products for buyers across India and abroad since 2002. Call or WhatsApp our team, and your quote will arrive within 24 hours.
