We are Riddhi Siddhi Impex, a Mumbai-based Inconel 625 Shims manufacturer and supplier, established in 2002. Our plant slits Alloy 625 shim stock to ASTM B443 / ASME SB-443 and AMS 5599, holding width to ±0.1 mm. As an ISO 9001, 14001, and 45001 certified company, we have a 400-500 tonnes monthly supply capacity and export to more than 60 countries. We also provide EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Inconel 625 shims are thin, precision-slit spacers of a nickel-chromium-molybdenum-niobium superalloy carrying 58% minimum nickel. Molybdenum and niobium stiffen the matrix in solid solution, so the material needs no ageing treatment. A shim in this grade retains mechanical strength and dimensional stability to about 980°C and resists pitting, crevice attack, and chloride stress-corrosion cracking. Engineers fit them wherever alignment must survive corrosion and temperature together. Inconel 625 shims are typically used for high-temperature, corrosion-resistant alignment in marine and chemical processing equipment.
As one of the reputable, reliable Inconel 625 shims suppliers, we produce every Inconel shim on our in-house slitting lines to ensure exact dimensional accuracy. This allows us to supply ready stock directly from our facility. We hold stock in Solution Annealed through Full Hard temper, slit between 3 mm and 2000 mm wide, and issue EN 10204 Type 3.1 or 3.2 certificates on request. Ready inventory keeps standard sizes moving within days.
Temper describes how much cold rolling a shim has taken after annealing, which sets its strength and how it holds thickness under a clamped load. We supply Inconel 625 shims in a Solution Annealed condition and in five cold-rolled hard tempers, each rolled to a tensile range we agree with the customer at the order stage and certify on the EN 10204 Type 3.1 or 3.2 mill test certificate. These cold-worked tempers are mill tempers rather than standardised conditions, so the certified figures come from the reduction agreed at order. The sections below cover the six conditions we slit and the work each one goes into.
Solution Annealed shim stock solves the complaint we hear most about hard shims: packs that will not sit down on an uneven face. The annealed stock we supply is certified at 827 to 1030 MPa tensile and 88 to 95 HRB. Our customers cut it into laminated peel-off sets and conform it to steelwork that has some waviness left in it. We interleave narrow coils with paper on the slitting line, since the burr at this temper is soft enough to mark the wrap below it.
We produce this temper with a light cold reduction that lifts tensile strength to 930 to 1100 MPa, reading 98 HRB to 22 HRC, while keeping enough ductility for gentle forming. We roll it as a mill temper to the tensile range fixed at order, verified by tensile test on the certificate. It suits customers who find shim stock too slack to survive handling but know full stiffness would fight their die. We supply it for machine alignment packs, light flat springs, and blanked shims that must stay flat between the press and the assembly bay.
Half hard suits customers who want a shim to hold its set thickness under bolt load rather than compress into the joint. We roll it to 1030 to 1170 MPa and 22 to 30 HRC, a heavier cold reduction than quarter hard, confirmed on the first-off certificate. Turbine assemblers take this condition for seal land and casing shims where creep in the pack would open a clearance. Forming is limited to gentle bends on a generous radius, and at widths below about 10 mm we watch camber closely on the slitting line.
Our customers specify this condition at 1100 to 1280 MPa and 28 to 34 HRC for shims loaded in shear or carrying a repeated bearing stress, such as those under bearing pedestals and valve yokes. We cold roll it towards the upper end of what stays workable, to the range agreed on the order. At this hardness the shim is a flat-blanked part and nothing more, so when a drawing shows a formed tab we steer the order back towards a softer temper. Buyers sometimes ask for this condition near the top of our 5 mm thickness range, where heavy cold reduction is not practical and solution-annealed plate is the correct call instead.
When a design calls for high yield in a thin section, we roll hard temper shim stock towards 1240 to 1380 MPa at 33 to 40 HRC, fixed against the order. Subsea connector make-up and valve trim spacing both take this condition, because the joint is cycled and the set clearance has to survive it. Corrosion performance is certified against the solution annealed condition. For heavily cold-worked material in aggressive service, confirm the application with our technical team. Coil set is stubborn at this temper, so thin gauges need careful uncoiling before blanking.
Full hard is the stiffest condition we slit, running 1350 to 1520 MPa and 38 to 45 HRC, produced for machine feet, riser clamps, and thruster mounts where the pack must not compress across an outage interval. It is a mill temper, and its strength figures come from the cold reduction agreed at order rather than from a published property table. Burr behaviour changes at full hard, so we set slitting clearances tighter to keep edges clean on narrow widths. We do not supply this temper for forming work, and where a specification insists on a standards-backed hard temper with guaranteed elongation, a 301 stainless shim is the honest recommendation.
We provide ASTM B443 Inconel 625 Shims and AMS 5599 aerospace stock in six tempers and four edge options, precision slit as coils.
| Parameter | Details |
|---|---|
| Standard | ASTM B443 / ASME SB-443, AMS 5599 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Temper | Solution Annealed, Quarter Hard, Half Hard, Three-Quarter Hard, Hard, Full Hard |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Scotch-Brite |
| Supply Forms | Cold rolled |
| Edge | Slit, Mill, Deburred, Round |
Chromium at 20 to 23% forms the oxide film that lets Inconel Alloy 625 Shims sit in hot, oxidising service. The complete ASTM B443 limits follow.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0 to 23.0 |
| Molybdenum (Mo) | 8.0 to 10.0 |
| Niobium + Tantalum (Nb+Ta) | 3.15 to 4.15 |
| Iron (Fe) | 5.0 max |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.015 max |
| Sulphur (S) | 0.015 max |
| Aluminium (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
| Cobalt (Co) | 1.0 max |
Annealed shim stock is certified to AMS 5599 / ASTM B443. Hard cold-worked tempers (1/4 Hard through Full Hard) are processed to proprietary commercial standards to achieve target mechanical values; they do not fall under the scope of AMS 5599.
| Temper | Tensile (MPa) | Rockwell |
|---|---|---|
|
Solution Annealed
|
827 to 1030 | 88 to 95 HRB |
|
Quarter Hard
|
930 to 1100 | 98 HRB to 22 HRC |
|
Half Hard
|
1030 to 1170 | 22 to 30 HRC |
|
Three-Quarter Hard
|
1100 to 1280 | 28 to 34 HRC |
|
Hard
|
1240 to 1380 | 33 to 40 HRC |
|
Full Hard
|
1350 to 1520 | 38 to 45 HRC |
Industrialists who specify 2.4856 shims or NiCr22Mo9Nb can match UNS N06625 shims against each regional designation below. We supply every entry.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | N06625 |
| Europe (EN) | NiCr22Mo9Nb |
| Germany (W.Nr) | 2.4856 |
| Japan (JIS) | NCF 625 |
| China (GB) | NS3306 |
| UK (BS) | NA 21 |
| France (AFNOR) | NC22DNb4M |
These 5 industries utilise most of the Alloy 625 Shims we slit, each relying on precise thickness, where heat and corrosion would finish off ordinary shim steel.
Turbine assemblers set 625 Nickel Alloy Shims under casings, seal lands, and blade roots to tune clearances. AMS 5599 stock keeps its fatigue strength through repeated thermal cycling, and a shim slit to ±0.1 mm drops into the stack without hand fitting.
Alignment shims for pump baseplates, reactor flanges, and agitator drives sit in acid vapour that destroys carbon steel packs. Molybdenum and niobium hold off pitting in hydrochloric and sulphuric service, so the set clearance stays where the millwright left it.
Seawater rarely pits this grade. Offshore crews level winch beds, thruster mounts, and riser clamps on Nickel Alloy 625 Shims because crevice corrosion under a clamped face is exactly where standard alloys fail. Thin gauges conform to uneven steelwork without cracking.
Boiler and turbine crews pack Inconel 625 shim stock behind bearing pedestals and valve yokes exposed to hot flue gas. Creep resistance keeps the pack thickness stable across long outage intervals, and the stable oxide film prevents shims seizing to the joint.
Wellhead and subsea equipment builders fit Alloy 625 shims in connector make-up and valve trim spacing. The grade takes sour service in its stride, resisting sulphide stress cracking where H2S would embrittle standard spring steels.
Orders are issued from our Mumbai and Taloja warehouses in wooden cases or on pallets, sea-worthy as standard.
| 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 |
Inconel 625 shims price in India is roughly ₹2,900 to ₹4,000 per kg, while export pricing is about $32 to $46 per kg for standard listings. Nickel rates, thickness, temper, and quantity all move the figure, so call or WhatsApp us for today's rate.
We slit Inconel 625 Shims from 0.03 mm to 5 mm thick and to widths between 3 mm and 2000 mm, held to ±0.1 mm.
We supply Inconel 625 Shims in six temper conditions: Solution Annealed, Quarter Hard, Half Hard, Three-Quarter Hard, Hard, and Full Hard, certified by tensile range and Rockwell hardness.
The applicable standards for Inconel 625 Shims are ASTM B443 and ASME SB-443 for sheet and strip, with AMS 5599 covering aerospace requirements.
The difference between Inconel 625 Shims and Inconel 600 shims lies in chemistry and strength. Alloy 625 adds molybdenum and niobium, so it is stronger and far more resistant to pitting in chloride and acid service.
Inconel 625 shims price in India is roughly ₹2,900 to ₹4,000 per kg, while export pricing is about $32 to $46 per kg for export, subject to gauge, temper, and nickel market movement.
You can source Inconel 625 Shims in India from us at Riddhi Siddhi Impex. We manufacture, stock, and export N06625 shim stock from Mumbai; phone or WhatsApp us, and a quote will be provided within 24 hours.
