Incoloy Plates for Uptime-Critical Plants | Why Process, Marine & Power Engineers Prefer Incoloy Over Stainless
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A coastal acid plant on the verge of scrapping a four-year-old absorber tower due to aggressive sulfuric acid and chloride attack on 316L cladding saw unplanned downtime soar past 11% and annual repair costs cross seven figures. The turnaround came when the OEM retrofitted with Incoloy 825 Plates (UNS N08825) and upgraded high-temperature ducting to Incoloy 800H Plates (UNS N08810), slashing corrosion rates by more than 60%, extending inspection intervals from 12 to 36 months, and restoring availability above 98% in one operating cycle.
For procurement heads, project engineers, fabricators, OEM manufacturers, and hardware or industrial supply stores serving chemical, oil & gas, marine, pharma, and power generation, Incoloy plates close the performance gap between commodity stainless steels and expensive nickel alloys. Incoloy 800/800H/825 combine nickel iron chromium matrices with additions like molybdenum, copper, and titanium to deliver high-temperature strength, resistance to carburization and oxidation, and robust immunity to sulfuric, phosphoric, and chloride-rich environments where 304/316L routinely fail.
Aurico Alloys LLP supports this demand as a trusted Incoloy Plates supplier, stockist, and exporter in India to abroad, offering affordable, authentic plate stock in Incoloy 800, 800H/800HT, 825 and related grades to ASTM B168 and ASTM B424 with EN 10204 3.1 certification, PMI, and project documentation. Hardware and industrial supply outlets gain a specification-driven product line that helps customers step up from stainless to Incoloy when lifecycle cost, uptime, and safety margins are the real purchasing drivers.
In such cases, Nimonic 75 (UNS N06075) can be paired with Incoloy plates: Incoloy handles bulk corrosion and temperature loads in vessels and transfer lines, while Nimonic 75 thin-gauge components manage turbine or burner-zone stresses where creep strength dominates.
High-quality Incoloy Plates ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP – Incoloy plates supplier, stockist, exporter in India to abroad |
|---|---|
| Primary Grades | Incoloy 800 (UNS N08800), 800H/800HT (UNS N08810/N08811), 825 (UNS N08825) |
| Standards | One plate, sheet and strip specification per grade – listed in Equivalent Grades & Standards below. Inspection certificates to EN 10204. |
| Thickness Range | 4.75 mm – 150 mm |
| Finishes | Hot-rolled, annealed & pickled, 2B/BA cold-rolled, polished where project specs demand |
| Documentation | EN 10204 3.1 MTC, NDT reports, PMI, third-party inspection on request |
| Price | INR 1,500 – 12,000 per kg. Indicative USD 18 – 141 per kg; quoted against grade, form, size and quantity. |
Incoloy Plate Grades Supplied
Each grade below has its own plate page carrying that grade’s size range, properties and the specification written for it. Incoloy 925 and 945 are not made in this form; their own pages list the forms they are supplied in.
| Grade | Chosen for |
|---|---|
| Incoloy DS Plates | Carburisation and thermal cycling in furnace parts |
| Incoloy 800 Plates | General furnace and process service |
| Incoloy 800H Plates | Controlled carbon and grain size for creep strength |
| Incoloy 800HT Plates | Tighter still on carbon and aluminium plus titanium |
| Incoloy 825 Plates | Sulphuric and phosphoric acid, pickling plant |
| Incoloy 890 Plates | Wet corrosion service |
| Incoloy 903 Plates | Constant modulus and low expansion, aerospace rings |
| Incoloy 909 Plates | Low expansion with higher strength than 903 |
| Incoloy 660 Plates | Iron-base precipitation-hardened superalloy for turbine and fastener service |
Key Incoloy Grades & Standards
Incoloy DS
| Property | Value |
|---|---|
| UNS number | N08330 |
| Werkstoff / EN number | 1.4886 |
| Density | 7.94 g/cm3 |
| Melting range | 1343-1393 °C |
| Specific heat (100 °F) | 0.117 Btu/lb·°F (no SI value published) |
| Thermal conductivity (75 °F) | 7.2 Btu·ft/ft²·hr·°F (no SI value published) |
| Electrical resistivity (75 °F) | 616 ohm·circ mil/ft (no SI value published) |
| Coefficient of expansion (70-200 °F) | 8.3 µin/in·°F (no SI value published) |
| Magnetic permeability (annealed at H=2810 oersted) | 1.009 |
| Plate, sheet and strip specification | ASTM B536 |
Identifiers and physical constants for Incoloy DS. A dash means no such designation is published for this grade.
Incoloy 800
| Property | Value |
|---|---|
| UNS number | N08800 |
| Werkstoff / EN number | 1.4876 |
| EN designation | X10NiCrAlTi32-21 |
| Density | 7.94 g/cm3 |
| Melting range | 1357-1385 °C |
| Specific heat (0-100 °C) | 460 J/kg·°C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.014 |
| Magnetic permeability (200 oersted at 21 °C - hot-rolled) | 1.009 |
| Curie temperature | -115 °C |
| Plate, sheet and strip specification | ASTM B409 / B906 / AMS 5871 |
Identifiers and physical constants for Incoloy 800. A dash means no such designation is published for this grade.
Incoloy 800H
| Property | Value |
|---|---|
| UNS number | N08810 |
| Werkstoff / EN number | 1.4958 |
| EN designation | X5NiCrAlTi31-20 |
| Density | 7.94 g/cm3 |
| Melting range | 1357-1385 °C |
| Specific heat (0-100 °C) | 460 J/kg·°C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.014 |
| Magnetic permeability (200 oersted at 21 °C - hot-rolled) | 1.009 |
| Curie temperature | -115 °C |
| Plate, sheet and strip specification | ASTM B409 / B906 |
Identifiers and physical constants for Incoloy 800H. A dash means no such designation is published for this grade.
Incoloy 800HT
| Property | Value |
|---|---|
| UNS number | N08811 |
| Werkstoff / EN number | 1.4959 |
| EN designation | X8NiCrAlTi32-21 |
| Density | 7.94 g/cm3 |
| Melting range | 1357-1385 °C |
| Specific heat (0-100 °C) | 460 J/kg·°C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.014 |
| Magnetic permeability (200 oersted at 21 °C - hot-rolled) | 1.009 |
| Curie temperature | -115 °C |
| Plate, sheet and strip specification | ASTM B409 / B906 |
Identifiers and physical constants for Incoloy 800HT. A dash means no such designation is published for this grade.
Incoloy 825
| Property | Value |
|---|---|
| UNS number | N08825 |
| Werkstoff / EN number | 2.4858 |
| EN designation | NiCr21Mo |
| Density | 8.14 g/cm3 |
| Melting range | 1370-1400 °C |
| Specific heat | 440 J/kg·°C |
| Curie temperature | < -196 °C |
| Magnetic permeability (at 200 oersted / 15.9 kA/m) | 1.005 |
| Plate, sheet and strip specification | ASTM B424 / B906 |
Identifiers and physical constants for Incoloy 825. A dash means no such designation is published for this grade.
Incoloy 890
| Property | Value |
|---|---|
| UNS number | N08890 |
| Werkstoff / EN number | — |
| EN designation | — |
| Density | 7.94 g/cm3 |
| Melting range | 1309-1383 °C |
| Plate, sheet and strip specification | ASTM B409 / B906 |
Identifiers and physical constants for Incoloy 890. A dash means no such designation is published for this grade.
Incoloy 903
| Property | Value |
|---|---|
| UNS number | N19903 |
| Werkstoff / EN number | — |
| EN designation | — |
| Density | 8.25 g/cm3 |
| Melting range | 1318-1393 °C |
| Curie temperature (age-hardened) | 416-471 °C |
| Plate, sheet and strip specification | Mill specification |
Identifiers and physical constants for Incoloy 903. A dash means no such designation is published for this grade.
Incoloy 909
| Property | Value |
|---|---|
| UNS number | N19909 |
| Werkstoff / EN number | — |
| EN designation | — |
| Density | 8.19 g/cm3 |
| Melting range | 1395-1430 °C |
| Curie temperature | 400-455 °C |
| Young's modulus | 159 GPa |
| Modulus of rigidity | 59 GPa |
| Plate, sheet and strip specification | AMS 5893 |
Identifiers and physical constants for Incoloy 909. A dash means no such designation is published for this grade.
Incoloy 660 (A286)
| Property | Value |
|---|---|
| UNS number | S66286 |
| Density | 7.94 g/cm3 |
| Melting range | 1371-1427 °C |
| Plate, sheet and strip specification | AMS 5525 / 5858 |
Identifiers and physical constants for Incoloy 660 (A286). A dash means no such designation is published for this grade.
Stock & Product Availability
As a focused Incoloy plates stockist, Aurico Alloys LLP supports standard dimensions in Incoloy 800/800H/825 with the ability to cut plates to customer drawings for tube sheets, baffles, channel heads, ducting, and cladding for columns and absorbers. Procurement teams and hardware distributors gain shorter RFQ-to-dispatch cycles than importing mill lots themselves, while maintaining global code compliance on projects.
Typical Chemical Composition
Incoloy DS
| Element | Min (%) | Max (%) |
|---|---|---|
| Chromium (Cr) | 18.0 | 20.0 |
| Nickel (Ni) | 34.0 | 37.0 |
| Manganese (Mn) | — | 2.0 |
| Silicon (Si) | 1.0 | 1.5 |
| Copper (Cu) | — | 1.0 |
| Phosphorus (P) | — | 0.03 |
| Sulfur (S) | — | 0.03 |
| Carbon (C) | 0.04 | 0.08 |
| Iron (Fe) | — | Balance |
Composition limits for Incoloy DS. 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.
Incoloy 800
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 30.0 | 35.0 |
| Chromium (Cr) | 19.0 | 23.0 |
| Iron (Fe) | 39.5 | — |
| Carbon (C) | — | 0.10 |
| Aluminium (Al) | 0.15 | 0.60 |
| Titanium (Ti) | 0.15 | 0.60 |
| Aluminium + Titanium (Al+Ti) | 0.30 | 1.20 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Copper (Cu) | — | 0.75 |
| Sulfur (S) | — | 0.015 |
Composition limits for Incoloy 800. 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.
Incoloy 800H
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 30.0 | 35.0 |
| Chromium (Cr) | 19.0 | 23.0 |
| Iron (Fe) | 39.5 | — |
| Carbon (C) | 0.05 | 0.10 |
| Aluminium (Al) | 0.15 | 0.60 |
| Titanium (Ti) | 0.15 | 0.60 |
| Aluminium + Titanium (Al+Ti) | 0.30 | 1.20 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Copper (Cu) | — | 0.75 |
| Sulfur (S) | — | 0.015 |
Composition limits for Incoloy 800H. 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.
Incoloy 800HT
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 30.0 | 35.0 |
| Chromium (Cr) | 19.0 | 23.0 |
| Iron (Fe) | 39.5 | — |
| Carbon (C) | 0.06 | 0.10 |
| Aluminium (Al) | 0.25 | 0.60 |
| Titanium (Ti) | 0.25 | 0.60 |
| Aluminium + Titanium (Al+Ti) | 0.85 | 1.20 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Copper (Cu) | — | 0.75 |
| Phosphorus (P) | — | 0.045 |
| Sulfur (S) | — | 0.015 |
Composition limits for Incoloy 800HT. 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.
Incoloy 825
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 38.0 | 46.0 |
| Iron (Fe) | 22.0 | — |
| Chromium (Cr) | 19.5 | 23.5 |
| Molybdenum (Mo) | 2.5 | 3.5 |
| Copper (Cu) | 1.5 | 3.0 |
| Titanium (Ti) | 0.6 | 1.2 |
| Carbon (C) | — | 0.05 |
| Manganese (Mn) | — | 1.0 |
| Sulfur (S) | — | 0.03 |
| Silicon (Si) | — | 0.5 |
| Aluminium (Al) | — | 0.2 |
Composition limits for Incoloy 825. 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.
Incoloy 890
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 42.5 nominal | |
| Chromium (Cr) | 25 nominal | |
| Iron (Fe) | — | Balance |
| Aluminium (Al) | 0.1 nominal | |
| Niobium (Nb) | 0.4 nominal | |
| Titanium (Ti) | — | 1 |
| Carbon (C) | 0.1 nominal | |
| Manganese (Mn) | — | 1 |
| Silicon (Si) | 1.8 nominal | |
| Phosphorus (P) | — | 0.03 |
| Sulfur (S) | — | 0.015 |
| Copper (Cu) | — | 0.75 |
| Molybdenum (Mo) | 1.5 nominal | |
| Tantalum (Ta) | 0.2 nominal | |
Composition for Incoloy 890. Figures given as a range or a maximum are limits and those marked nominal are not; none of them are measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Incoloy 903
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 36.0 | 40.0 |
| Cobalt (Co) | 13.0 | 17.0 |
| Aluminium (Al) | 0.30 | 1.15 |
| Titanium (Ti) | 1.00 | 1.85 |
| Niobium (Nb) | 2.40 | 3.50 |
| Iron (Fe) | — | Balance |
Composition limits for Incoloy 903. 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.
Incoloy 909
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 35.0 | 40.0 |
| Cobalt (Co) | 12.0 | 16.0 |
| Niobium (Nb) | 4.3 | 5.2 |
| Titanium (Ti) | 1.3 | 1.8 |
| Iron (Fe) | — | Balance |
| Silicon (Si) | 0.25 | 0.50 |
| Aluminium (Al) | — | 0.15 |
| Carbon (C) | — | 0.06 |
Composition limits for Incoloy 909. 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.
Incoloy 660 (A286)
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.08 |
| Manganese (Mn) | 1.0 | 2.0 |
| Silicon (Si) | — | 1.0 |
| Sulfur (S) | — | 0.015 |
| Phosphorus (P) | — | 0.025 |
| Chromium (Cr) | 13.5 | 16.0 |
| Nickel (Ni) | 24.0 | 27.0 |
| Iron (Fe) | — | Balance |
| Molybdenum (Mo) | 1.0 | 1.5 |
| Titanium (Ti) | 1.90 | 2.35 |
| Aluminium (Al) | — | 0.35 |
| Boron (B) | 0.003 | 0.010 |
| Vanadium (V) | 0.10 | 0.50 |
Composition limits for Incoloy 660 (A286). 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 | Incoloy 800H | Incoloy 825 |
|---|---|---|
| Tensile Strength (Room Temp) | ≈520–690 MPa | ≈550–560 MPa (≥80 ksi) |
| Yield Strength (0.2% Offset) | ≈210–400 MPa | ≈220 MPa (≥32 ksi) |
| Elongation | ≥30 % | ≈30 % |
| Max Recommended Service Temp | ≈600–980°C for creep-limited service (800H/800HT) | Typically up to ≈540°C in most plate applications |
Applications & Performance Advantages
- Chemical & Fertilizer: Incoloy 825 plates in acid production, pollution control, and pickling lines resist sulfuric and phosphoric acids, chloride stress-corrosion cracking, and mixed oxidizing/reducing environments where 316L and even duplex grades pit or crack prematurely.
- Oil & Gas: Incoloy 825 and 800H plates in downhole tools, clad pipes, and heat exchangers handle sour gas (H₂S/CO₂), brines, and high-temperature service better than standard stainless steels, reducing workover frequency and corrosion monitoring interventions.
- Marine & Power: Incoloy plate cladding on seawater-cooled condensers, FGD units, and waste-heat boilers resists pitting, crevice corrosion, and high-temperature oxidation in chlorides and flue gas where standard austenitic stainless steels lose wall thickness rapidly.
- Pharma & OEM Fabrication: For clean but aggressive environments (pharma intermediates, specialty chemicals), Incoloy provides a more stable passive layer than stainless, reducing rouge formation, re-passivation downtime, and surface rework.
FAQ & Search Trends
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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
Incoloy plates from Aurico Alloys LLP combine ASTM B168/B424 compliance, UNS N08800/N08810/N08825 metallurgy, and proven field performance to give chemical, oil & gas, marine, pharma, and power users a robust upgrade path from stainless steels to alloys engineered for uptime, safety, and lifecycle value are your next critical vessels, columns, and heat exchangers specified with Incoloy plates that truly match the risks and returns of your process?