Incoloy 903 Sheets Supplier | UNS N19903 AMS 5892 High-Strength Low Expansion Alloy
When a leading gas turbine OEM discovered their compressor casing expanding 25% more than rotor blades during hot starts causing blade tip clearances to exceed limits and trigger emergency shutdowns engineers specified Incoloy 903 Sheets (UNS N19903). With controlled thermal expansion of just 7.2 µm/m/°C from -196°C to 650°C and age-hardened strength exceeding 1725 MPa UTS, Incoloy 903 eliminated dimensional mismatches, enabling 15% higher turbine efficiency and 2x longer maintenance intervals.
Table of Contents
- Incoloy 903 Sheets Specification UNS N19903
- Equivalent Grades AMS 5892
- Incoloy 903 Sheet Thickness & Ready Stock
- Incoloy 903 Chemical Composition
- Incoloy 903 Mechanical Properties Age Hardened
- Applications Gas Turbine Casings Steam Turbine Bolts
- FAQ Incoloy 903 vs 909 Age Hardening
- Why Buy Incoloy 903 Sheets
Unlike conventional nickel alloys where thermal expansion varies 30-50% across operating temperatures, Incoloy 903 maintains constant modulus (147 GPa) and minimal CTE variation, making it the material of choice for gas turbine casings, steam turbine bolts, rocket engine thrust chambers, and ordnance hardware where precise dimensional stability under thermal cycling is mission-critical.
Incoloy 903 outperforms Incoloy 909 (higher cost, similar properties) and standard superalloys by combining age-hardening response (solution 980°C + age 650°C/8h) with low thermal expansion, delivering rupture strength >1000 MPa at 650°C while maintaining ductility >15% elongation ideal for high-stress components in chemical reactors, oil & gas pressure vessels, marine turbine housings, pharma sterilization equipment, and power generation hardware.
Aurico Alloys LLP provides affordable, best quality, authentic Incoloy 903 Sheets as trusted supplier, manufacturer and stockist for chemical, oil & gas, marine, pharma, power generation industries and hardware stores Incoloy 903 sheets supplier, stockist, exporter in India to abroad with AMS 5892 certification, competitive Incoloy 903 sheet price per kg, and Incoloy 903 sheet thickness from 0.5mm to 50mm in ready stock.
High-quality Incoloy 903 Sheets ready for industrial use.
Incoloy 903 Sheets Specification UNS N19903
| Supplier Role | Aurico Alloys LLP - Incoloy 903 sheets supplier, stockist, exporter India to abroad |
|---|---|
| Alloy Grade | Incoloy 903 UNS N19903 AMS 5892 |
| Standards | Special Metals proprietary specification; no ASTM or AMS specification is published for this grade |
| Incoloy 903 Sheet Thickness | 0.5mm - 50mm (custom gauges available) |
| Width Range | 500mm - 2000mm |
| Length | 1000mm - 6000mm or cut-to-size |
| Condition | Solution annealed + age hardened (980°C soln + 650°C/8h age) |
| Finish | Hot rolled, cold rolled, annealed, descaled |
| Certification | EN 10204/3.1, PMI, age hardening verification |
Equivalent Grades AMS 5892
| 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 903 Sheet Thickness & Ready Stock
Incoloy 903 sheet ready stock includes popular gauges: 1.0mm, 2.0mm, 3.0mm, 6.0mm, 12.0mm, 25.0mm x 1000/1500mm widths for gas turbine casing rings and steam turbine bolting blanks.
Incoloy 903 Chemical Composition
| 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 903 Mechanical Properties Age Hardened
| Property | Age Hardened Value | Temp Range |
|---|---|---|
| Ultimate Tensile Strength | ≥1725 MPa | Room temp |
| 0.2% Yield Strength | ≥1450 MPa | Room temp |
| Elongation | ≥15% | Room temp |
| Modulus of Elasticity | 147 GPa constant | -196°C to 650°C |
| Coefficient Thermal Expansion | 7.2 µm/m/°C constant | -196°C to 650°C |
| Rupture Strength | >1000 MPa | @ 650°C |
Applications Gas Turbine Casings Steam Turbine Bolts
Why this grade
Incoloy 903 is a controlled-expansion superalloy: a nickel-cobalt-iron base with essentially no chromium, giving a low and nearly constant coefficient of thermal expansion together with a constant modulus to about 650°C. It is used where running clearance has to be held — gas turbine rings, casings and shrouds. Carrying no chromium, it has no inherent oxidation resistance and is normally coated.
- Incoloy 903 for gas turbine casings: Compressor casings, turbine shrouds requiring constant CTE matching rotor materials
- High-strength alloy for steam turbine bolts: Large diameter bolting maintaining preload through thermal cycling
- Incoloy 903 rocket engine thrust chambers: Cryogenic to combustion temperature components with dimensional stability
- Incoloy 903 for ordnance hardware: Precision guidance components surviving launch shock and thermal extremes
- Chemical Process: High-pressure reactor vessels, thermal cycling components
- Oil & Gas: Subsea valve actuators, high-pressure manifolds
FAQ Incoloy 903 vs 909 Age Hardening
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Why Buy Incoloy 903 Sheets
High-Strength UNS N19903 Sheet Supplier Aurico Alloys LLP delivers AMS 5892 Incoloy 903 Sheets with guaranteed constant thermal expansion, age-hardened mechanical properties, and immediate availability eliminating thermal mismatch failures in your gas turbines, steam turbines, rocket engines, and precision hardware. Ready to secure your high-performance components with proven Incoloy 903 dimensional stability?