We are Riddhi Siddhi Impex, an ISO 9001, ISO 14001, and ISO 45001-certified Duplex Steel Strips manufacturer and supplier working from Mumbai since 2002. Our slitting lines cut two-phase stainless strip to ASTM A240 / ASME SA-240 in widths from 3 mm through 2000 mm, held to ±0.1 mm. Ready stock plus a monthly supply capacity of 400 to 500 tonnes puts standard dispatch at 4 to 5 days.
Duplex steel strips are narrow, flat-rolled lengths of stainless steel whose microstructure splits close to 50/50 between austenite and ferrite. That dual phase gives the material roughly twice the strength of common austenitic grades such as 304 and 316, so fabricators can specify a thinner gauge for the same load. Chromium, molybdenum, and nitrogen in the chemistry defend the surface against chloride pitting and stress corrosion cracking, the two failure modes that retire ordinary stainless parts in brine and seawater duty.
Our warehouse carries duplex stainless steel strips in thicknesses of 0.03 mm to 5 mm, produced on hot rolled and cold rolled routes and supplied annealed. Slitting happens in-house, so buyers can order widths anywhere from 3 mm up to 2000 mm with slit, mill, deburred, or round edges at no added lead time. Coil inner diameters span 150 mm to 610 mm, with outer diameters reaching 1800 mm. Mill documentation stays with every source coil, and an EN 10204 Type 3.1 / 3.2 certificate travels with each dispatch upon request.
We supply Duplex 2205 steel strips that are ideal for demanding marine, offshore, and industrial applications.
Four finishes cover the duplex strip range; the rolling route and the end use decide which applies.
2B
Cold rolling with annealing and pickling leaves a smooth, faintly reflective surface. Most cold-rolled duplex strip ships 2B.
BA
Annealing under a protective atmosphere preserves a bright, oxide-free face for parts where appearance or sealing contact matters.
No. 4
Abrasive brushing lays a fine, uniform grain across the strip. Buyers pick it to hide handling marks on visible parts.
Matte
A low-gloss dull surface keeps reflections down where glare or fingerprints would show on the finished component.
Duplex steel winding strips leaving our warehouse serve three primary industrial sectors, each one buying the grade for chloride resistance, strength, or both.
Process plants use Duplex 2205 strip in exchanger baffles, gasket blanks, and internal trim for warm chloride-bearing streams. Where an austenitic part cracks and forces a shutdown, the duplex structure keeps running, and the higher strength lets designers thin the section without losing pressure margin.
Offshore topsides and subsea hardware are in salt spray and saline produced water around the clock. Duplex 2205 strips become clamp bands, instrument components, and sealing elements that resist pitting while carrying genuine mechanical load. Precision-slit widths drop straight into assembly without trimming.
Warm chloride-bearing streams and seawater-side hardware are a demanding duty. Desalination plants and shipyards use Duplex 2205 strip for flash chamber trim, pump parts, and seawater-side components where its nitrogen-boosted chemistry resists pitting far better than standard austenitic grades.
Every coil we slit leaves with full documentation. Riddhi Siddhi Impex holds three ISO certifications backed by mill-level traceability.
An EN 10204 Type 3.1 / 3.2 mill test certificate tied to the original mill heat accompanies each order. Type 3.2 comes on request.
ISO 9001:2015 certification covers our quality management system from order review through slitting and final inspection.
Our environmental practices run under ISO 14001:2015, governing material storage, handling, and scrap segregation at the lines.
ISO 45001:2018 certification covers occupational health and safety across the warehouse and processing floor.
Duplex is a stainless steel, so duplex steel slit coil falls under HS heading 7219 when 600 mm or wider and 7220 below that width. They never use the nickel heading 7506. Check the exact subheading with your customs broker.
Yes, Duplex strips are in ready stock at our Mumbai and Taloja warehouses. Standard orders dispatch in 4 to 5 days; urgent requirements leave in 2 to 3.
We slit duplex steel strips to any width from 3 mm to 2000 mm, holding ±0.1 mm, with slit, mill, deburred, or round edges. Thickness runs from 0.03 mm to 5 mm.
You can buy from a reliable duplex steel strip supplier like Riddhi Siddhi Impex in Mumbai, where we have slit and stocked stainless steel strips since 2002. Phone or WhatsApp our team and a quote will reach you within 24 hours.
