Incoloy 903 Plates | Special Metals proprietary specification UNS N19903 Aerospace Precision Alloy
Table of Contents:
When ISRO's cryogenic rocket engine test stand experienced dimensional drift causing seal failures after 50 thermal cycles between -253°C and 650°C, engineers rejected conventional superalloys and specified Incoloy 903 Plates its ultra-low thermal expansion (CTE 1.2×10⁻⁶/°C) maintained critical tolerances where Inconel 718 drifted 0.3% and Waspaloy suffered fatigue cracking. Aerospace OEMs, gas turbine designers, petrochemical precision fabricators, and pharma equipment manufacturers now demand these age-hardenable nickel-iron superalloys (UNS N19903) where dimensional stability trumps raw strength in cryogenic-to-hot service.
Incoloy 903 achieves 1240 MPa ultimate tensile strength and 860 MPa yield after double age-hardening (1325°F + 1150°F), with constant modulus alloy design that maintains 30% elongation through 650°C superior to Rene 41 or Udimet 720 for thin-section turbine casings and seals. The Nb/Ti/Al precipitation system provides thermal stability without gamma-prime overaging that plagues conventional nickel superalloys above 1200°F.
Aurico Alloys LLP supplies affordable, authentic Incoloy 903 Plates as trusted supplier, manufacturer, and stockist for chemical, oil & gas, marine, pharma, power industries, and hardware stores with full Special Metals proprietary specification/ASME SB637 compliance and age-hardening certification. As premier Incoloy 903 Plates supplier, stockist, exporter in India to abroad, we serve Incoloy 903 plate suppliers in Mumbai for gas turbine casings and seals with solution-treated + double-aged plate ready for final machining.
High-quality Incoloy 903 Plates ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP - Incoloy 903 exporters Mumbai |
|---|---|
| Grade | Incoloy 903 (UNS N19903) |
| Standards | Special Metals proprietary specification; no ASTM or AMS specification is published for this grade |
| Thickness Range | 4.75 mm – 150 mm |
| Condition | Solution treated + double age hardened |
| Finish | Precision ground, machined plate |
| Delivery | MTC 3.1, age certification, PMI |
| Price | INR 4,500 – 6,800 per kg. Indicative USD 53 – 80 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| 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.
Stock & Product Availability
Low thermal expansion Incoloy 903 plates for aircraft engine rocket motors; Special Metals proprietary specification Incoloy 903 plate stockist for steam turbine components in India with double age certification. Incoloy 903 plate price per kg in Mumbai for high-precision aerospace fasteners.
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.
Mechanical Properties
| Condition | UTS MPa | 0.2%YS MPa | Elong % | CTE ×10⁻⁶/°C |
|---|---|---|---|---|
| Solution + Aged | 1240 | 860 | 30 | 1.2 (RT-650°C) |
| RT Properties | 1310 | 1035 | 25 | - |
| 650°C Properties | 1170 | 860 | 35 | - |
Applications & Benefits
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.
- Aerospace: Incoloy 903 plate suppliers in Mumbai for gas turbine casings and seals; rocket motor housings where thermal growth must stay <0.1%.
- Chemical: UNS N19903 nickel alloy plates for chemical reactors requiring high dimensional stability; oxygen systems without embrittlement.
- Power: High-strength Alloy 903 plates for steam turbine components; precision valve seats maintaining clearances.
- Oil&Gas: Marine grade Incoloy 903 plates for subsea high-strength instrumentation; constant modulus sensors.
- Pharma: High-purity Incoloy 903 plates for pharmaceutical high-temperature sterilization machinery; cryogenic lab equipment.
- Sourcing: Verified Incoloy 903 plate exporters in India with Mill Test Certificates; custom cut for aerospace fasteners.
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
Incoloy 903 plates from Aurico Alloys LLP deliver unmatched Special Metals proprietary specification/UNS N19903 dimensional stability and age-hardened strength essential for gas turbine casings, rocket motors, and precision components where thermal growth destroys functionality, as leading Incoloy 903 Plates supplier, stockist, exporter in India to abroad. Are your cryogenic-to-hot precision applications protected by 903's constant modulus technology?