Inconel 625 Plates | UNS N06625 Corrosion-Resistant Plates for Seawater, Sour Gas & High-Temperature Process Duty
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A Middle East–India offshore project team had grown used to fighting the same battles: stainless-steel seawater piping that pitted through around splash zones, flare boom exhaust casings rusting faster than amortisation schedules and desalination heat exchangers needing retube work just when production targets peaked, all because materials chosen for “good enough” corrosion resistance could not cope with warm, oxygenated seawater, chlorides and cyclic temperatures. When key seawater risers, flare booms, desalination plates and sour-gas tie-in spools were rebuilt in Inconel 625 Plates (UNS N06625, W.Nr. 2.4856), the project shifted to a nickel–chromium–molybdenum–niobium alloy whose datasheets describe it as a versatile high-temperature and corrosion-resistant alloy, with chemical composition roughly 58%+ Ni, 20–23% Cr, 8–10% Mo and 3.15–4.15% Nb + Ta, typical annealed tensile strength around 827 MPa, yield around 414 MPa, elongation around 30% and proven resistance to pitting, crevice corrosion, impingement attack, sour gas and chloride stress-corrosion cracking in seawater and FGD environments.
Inconel 625 (Alloy 625, UNS N06625) is a nickel–chromium–molybdenum alloy with niobium that strengthens the matrix by solid-solution and precipitation mechanisms without the need for a separate age-hardening heat treatment. Technical documents explain that the high nickel and chromium contents give excellent resistance to a wide range of oxidising and reducing environments, the molybdenum and niobium confer high resistance to pitting, crevice corrosion and chloride-induced stress-corrosion cracking, and the alloy performs well in strong acids, seawater, sour gas, high-purity water and high-temperature oxidising and carburising environments.
For procurement heads, design engineers, fabricators, OEMs and hardware or industrial supply stores serving chemical, oil & gas, marine, pharma and power generation, Inconel 625 plates solve a recurring challenge: delivering one alloy that can handle warm seawater, sour gas, acid media, FGD slurries and elevated temperatures where 6Mo or duplex stainless grades approach their limit. Typical property tables for annealed plate and sheet list ultimate tensile strength around 827 MPa (120 ksi), 0.2% yield strength around 414 MPa (60 ksi), elongation around 30% and hardness up to about 240–287 HB, with corrosion-testing work showing alloy 625 achieves corrosion rates under 20 mpy across a wide range of sulfuric acid concentrations at practical temperatures and sits in the noble region of seawater galvanic series with good corrosion-fatigue strength.
Aurico Alloys LLP can support these requirements as an affordable, authentic Inconel 625 Plates supplier, manufacturer and stockist in India, delivering UNS N06625 / 2.4856 plates per ASTM B443 / ASME SB443 and related ISO and EN standards with EN 10204 3.1 Mill Test Certificates for seawater piping, submarine components, offshore flare booms, desalination heat exchangers, sour gas headers, FGD absorbers, nuclear and waste-to-energy systems. This matches search intent such as “Inconel 625 plate suppliers in Mumbai for seawater piping and submarine components”, “ASTM B443 Inconel 625 plates for offshore platform flare booms and exhaust systems”, “Corrosion resistant Alloy 625 plates for marine propeller blades and wire rope sheathing”, “Inconel 625 plate price in Mumbai for desalination plant heat exchangers”, “NACE MR0175 Inconel 625 plates for sour gas service and downhole equipment” and “Inconel 625 plate inventory in Mumbai with Mill Test Certificates (MTC) and 3.1 certification”.
High-quality Inconel 625 Plates ready for industrial use.
Specification Overview
| Supplier & Role | Aurico Alloys LLP – Inconel 625 plate suppliers in Mumbai for seawater piping, submarine components, offshore flare booms, distillation columns and high-pressure reactors, with 3.1/MTC support for Indian and export projects. |
|---|---|
| Alloy Description | Ni–Cr–Mo–Nb high-strength, corrosion-resistant alloy used from cryogenic temperatures up to about 982°C in chemical processing, marine engineering, oil & gas, pollution control and nuclear reactors. |
| UNS / Werkstoff / EN | UNS N06625, W.Nr. 2.4856, ISO NW6625; Alloy 625 is also associated with various EN and national designations in plate and sheet standards. |
| Main Plate Standards | ASTM B443 / ASME SB443 for plate, sheet and strip; ISO 6208; AMS 5599 / 5869 for aerospace plate and sheet; NACE MR0175/ISO 15156 listed for sour service when chemistry and heat treatment meet the conditions. |
| Thickness Range | 4.75 mm – 150 mm |
| Key Corrosion Focus | Excellent resistance to pitting, crevice corrosion, impingement attack, intergranular corrosion, chloride stress-corrosion cracking, sour gas and FGD and flue-gas environments, plus very good performance in seawater and brackish water. |
| Target Industries | Marine and subsea, oil & gas and petrochemical, power generation (including nuclear and waste-to-energy), chemical and fertilizer plants and high-spec pharma and aerospace hardware. |
| Price | INR 2,500 – 5,000 per kg. Indicative USD 29 – 59 per kg; quoted against grade, form, size and quantity. |
UNS & Equivalent Grades
| Property | Value |
|---|---|
| UNS number | N06625 |
| Werkstoff / EN number | 2.4856 |
| Density | 8.44 g/cm3 |
| Melting range | 1290-1350 °C |
| Specific heat (21 °C) | 410 J/kg·°C |
| Plate, sheet and strip specification | ASTM B443 / AMS 5599 / 5869 |
Identifiers and physical constants for Inconel 625. A dash means no such designation is published for this grade.
Stock & Product Availability
As ASTM B443 Inconel 625 plate stockist in Mumbai, Aurico Alloys LLP can supply hot-rolled and cold-rolled plates for seawater piping, submarine components, offshore flare booms, exhaust systems, desalination plant heat exchangers and fuel-refinery distillation columns, typically in solution-annealed condition suitable for fabrication and welding. Plate specifications list minimum tensile strength about 827 MPa, minimum yield strength about 414 MPa and elongation about 30% for annealed plate and sheet, giving robust safety margins for high-pressure and cyclic loading in piping, risers and process vessels.
This inventory directly supports search needs such as “Inconel 625 plate suppliers in Mumbai for seawater piping and submarine components”, “Inconel 625 plate price in Mumbai for desalination plant heat exchangers”, “Inconel 625 plate stockist in Mumbai for fuel refinery distillation columns”, “High-strength Inconel 625 plates for subsea wellhead accessories and risers in India”, “ASME SB443 Inconel 625 plates for nuclear reactor core and control-rod components”, “Inconel 625 plate exporters in Mumbai for waste-to-energy boiler tubing and liners”, “Alloy 625 plates for phosphoric acid evaporators and fertilizer plant equipment” and “Inconel 625 plate inventory in Mumbai with Mill Test Certificates (MTC) and 3.1 certification”.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 58.0 | — |
| Chromium (Cr) | 20.0 | 23.0 |
| Iron (Fe) | — | 5.0 |
| Molybdenum (Mo) | 8.0 | 10.0 |
| Niobium + Tantalum (Nb+Ta) | 3.15 | 4.15 |
| Carbon (C) | — | 0.10 |
| Manganese (Mn) | — | 0.50 |
| Silicon (Si) | — | 0.50 |
| Phosphorus (P) | — | 0.015 |
| Sulfur (S) | — | 0.015 |
| Aluminium (Al) | — | 0.40 |
| Titanium (Ti) | — | 0.40 |
| Cobalt (Co) | — | 1.0 (if determined) |
Composition limits for Inconel 625. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property (Typical, Annealed Plate/Sheet) | Value – Inconel 625 / UNS N06625 |
|---|---|
| Ultimate Tensile Strength (RT) | ≈827 MPa (120 ksi) for annealed plate/sheet. |
| 0.2% Yield Strength (RT) | ≈414 MPa (60 ksi) for annealed plate/sheet. |
| Elongation | ≈30% in 50 mm for plate and sheet. |
| Hardness | ≈145–240 HB typical; ≤287 HB for bar in annealed condition. |
| Temperature Range | Useful mechanical properties from cryogenic conditions up to around 982°C in many applications. |
| Seawater & Sour Service | Described as almost immune to chloride stress-corrosion cracking, resistant to pitting, crevice and impingement corrosion and qualified for sour gas per NACE MR0175/ISO 15156 when conditions are met. |
| FGD & Flue Gas | Nickel-institute and industry data show high resistance to localised corrosion in FGD stack-gas environments and good performance in FGD absorbers and ducts. |
Applications & Benefits
- Marine & Desalination: Inconel 625 plates are used in seawater piping, submarine components, offshore flare booms and exhaust systems, marine propeller blades, wire rope sheathing and desalination plant heat exchangers where pitting, crevice and corrosion-fatigue resistance in warm seawater are critical.
- Oil, Gas & Petrochemical: NACE MR0175-compliant Alloy 625 plates support sour gas service and downhole equipment, fuel refinery distillation columns, UNS N06625 chemical transfer lines and reaction vessels and high-strength subsea wellhead accessories and risers for Indian offshore fields.
- Power Generation & Chemical: ASME SB443 Inconel 625 plates are applied in nuclear reactor cores and control-rod components, waste-to-energy boiler tubing and liners, phosphoric acid evaporators, fertilizer plant equipment and FGD systems where combined chlorides, acids and high temperatures demand top-tier corrosion performance.
- Pharma, Aerospace & Sourcing: Custom cut Inconel 625 plate sizes support pharmaceutical high-pressure reactors and high-integrity equipment, while aerospace jet engine exhaust systems and ducting also rely on Alloy 625, with inventories in Mumbai carrying EN 10204 3.1 MTCs for global OEMs and local fabricators.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Inconel 625 Plates from Aurico Alloys LLP, supplied to UNS N06625 / 2.4856 chemistry ranges and ASTM B443 / ASME SB443 mechanical requirements with EN 10204 3.1 Mill Test Certificates and NACE MR0175-aligned options, give chemical, oil & gas, marine, pharma and power-generation users a nickel–chromium–molybdenum–niobium alloy that unites high strength with outstanding seawater, sour-gas, acid, FGD and high-temperature corrosion resistance for seawater piping, risers, flare booms, desalination, reactors, nuclear components and jet exhaust systems are your most corrosion-critical and high-value assets still relying on borderline stainless solutions instead of fully optimised Inconel 625 plates?