We are Riddhi Siddhi Impex, an ISO 9001, ISO 14001, and ISO 45001-certified Mumbai-based Monel coils supplier and stockist established in 2002. We stock nickel-copper alloy coils to ASTM B127 / ASME SB-127 from reputed primary mills, slit in-house to any width between 3 mm and 2000 mm. Ready inventory, a supplying capacity of 400 to 500 tonnes per month, and dispatch within 4 to 5 days keep fabrication lines fed without mill lead times.
Monel coils are continuous lengths of flat-rolled nickel-copper alloy wound after hot or cold rolling. The alloy pairs roughly two-thirds nickel with one-third copper in a solid solution that heat treatment cannot harden; strength builds through cold work alone. That chemistry withstands three media known to pit or crack most stainless grades: seawater, brines, and hydrofluoric acid. Ductility holds from sub-zero service up to elevated temperatures, so parts formed from coil stay tough across the whole operating range. Fabricators also favour coil feed over slitted sheet because every blank nests along one continuous rolled length, which trims material waste.
Our Mumbai warehouse holds Monel coil in both rolling routes. Cold rolled material starts at 0.03 mm, and hot-rolled covers the heavier gauges up to 5 mm. Every full-width coil arrives with mill documentation before slitting or dispatch, and material ships in the annealed condition ASTM B127 prescribes for flat products. Buyers can order full source coils or slit widths from the same stock.
We maintain a ready stock of a single, premium Monel 400 grade specifically engineered to deliver exceptional corrosion resistance in harsh seawater and aggressive acid environments.
3 industrial sectors utilise the Monel coils leaving our slitting lines. Each one specifies Monel 400 for corrosion performance in chloride or reducing media rather than raw strength.
Seawater hardware is the classic Monel 400 duty. Shipbuilders and offshore contractors turn slit coil into pump sleeves, sheathing for splash zones, and fastener stock that keeps its section in saline exposure known to pit stainless steel within a season. Slit widths arrive ready for roll forming, so yards skip an intermediate processing step.
Process plants line vessels and build heat exchanger strips from Monel 400 coils, and heating elements for caustic and hypochlorite streams come from the same stock. Hydrofluoric acid duty often settles the grade choice on its own; few flat-rolled alloys survive it. Plants concentrating sodium hydroxide specify Monel 400 for evaporator internals as well.
Sour wells demand alloys that tolerate hydrogen sulphide, and Monel 400 coil qualifies for such service. Operators machine valve trim, instrument components, and downhole sealing parts from slit widths that feed forming lines directly. We hold ready stock in Mumbai for quick replacement during plant shutdowns.
Quality documentation backs every Monel coil dispatch. Riddhi Siddhi Impex holds 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 is available on request.
Our ISO 9001:2015 certification covers the quality management system behind our sourcing, stocking, and slitting operations.
ISO 14001:2015 governs environmental management across the warehouse, from storage through material movement.
Workplace safety runs under ISO 45001:2018, covering occupational health in our warehouse and on the slitting floor.
Monel is a nickel alloy, so flat-rolled Monel coils fall under HS heading 7506, which covers nickel plates, sheets, strip, and foil. Confirm the final subheading with your customs broker before shipment.
Yes, Monel coils stay in ready stock at our Mumbai warehouse year round. Standard dispatch takes 4 to 5 days. Urgent orders leave within 2 to 3 days.
Yes. We slit any width between 3 mm and 2000 mm, holding tolerance to ±0.1 mm. Coil ID runs from 150 mm to 610 mm, with OD up to 1800 mm.
Riddhi Siddhi Impex stocks Monel coils in Mumbai for buyers across India and abroad, and has done so since 2002. Call or WhatsApp our team and you'll get a quote within 24 hours.
