Inconel 718 Plates | UNS N07718 Age-Hardened Plates for Aerospace Turbines, Oilfield Wellheads & Gas Turbine Discs
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During a critical deepwater oilfield development, subsea wellhead connectors and high-pressure manifolds began experiencing hydrogen embrittlement cracking and stress relaxation after only 18 months in H₂S-contaminated sour service at 10,000 psi, threatening production from a $2B+ project until operators specified NACE MR0175-compliant Inconel 718 Plates (UNS N07718). Age-hardened to AMS 5596 / ASTM B670 requirements with minimum tensile strengths of 1275 MPa, yield strengths of 1034 MPa, 12% minimum elongation and 331 HB hardness, these precipitation-hardened Ni-Cr-Fe-Nb plates delivered the combination of extreme strength, sour-gas corrosion resistance and cryogenic toughness (-253°C Charpy impact >40 ft-lb) that allowed wellhead redesigns to achieve 25+ year design lives without failure, fundamentally changing deepwater completion economics.
INCONEL alloy 718 (UNS N07718 / 2.4668) is a precipitation-hardening nickel-chromium-iron alloy strengthened by ordered γ″-Ni₃Nb and γ′-Ni₃(Al,Ti) phases that provide exceptional tensile strength (1275 MPa minimum), yield strength (1034 MPa minimum), creep-rupture resistance to 700°C and corrosion resistance across cryogenic to high-temperature service. Technical data describe it as age-hardenable from solution-annealed condition (typically 980–1065°C) through double-aging cycles (718°C/8h furnace cool to 621°C/8h), achieving combinations of high strength, fatigue resistance and SCC immunity that make it the material of choice for rotating aircraft engine components, oilfield wellhead hardware and nuclear reactor internals.
For procurement heads, design engineers, fabricators, OEMs and hardware stores serving chemical, oil & gas, marine, pharma and power-generation sectors, Inconel 718 plates solve the classic dilemma of needing aircraft-grade strength (UTS >185 ksi) with oilfield sour-service compliance (NACE MR0175 HRC ≤35 max) in a single alloy, unlike conventional stainless or lower-strength nickel alloys that sacrifice either mechanical margin or H₂S tolerance. AMS 5596 plate specifications require minimum tensile 1275 MPa, yield 1034 MPa, 12% elongation and 331 HB hardness after full heat treatment, while API 6A CRA variants maintain these properties with controlled chemistry for sour service, enabling unified material strategies across aerospace turbines, subsea wellheads and gas turbine discs.
Aurico Alloys LLP supports these requirements as an affordable, authentic Inconel 718 Plates supplier, stockist and exporter in India to abroad, supplying UNS N07718 plates per ASTM B670, AMS 5596 and NACE MR0175 with EN 10204 3.1 Mill Test Certificates for aircraft gas turbine engine components, API 6A wellheads, subsea manifolds, nuclear reactor hardware and high-creep gas turbine discs. This directly addresses searches like "Inconel 718 plate suppliers in Mumbai for aircraft gas turbine engine components", "AMS 5596 Inconel 718 plates for high-strength aerospace structures", "API 6A CRA Inconel 718 plates for high-pressure wellhead tools", "NACE MR0175 compliant Inconel 718 plates for hydrogen embrittlement resistance" and "Verified Inconel 718 plate stockholders in India with MTC EN 10204 3.1 certification".
High-quality Inconel 718 Plates ready for industrial use.
Specification Overview
| Supplier & Role | Aurico Alloys LLP – Inconel 718 plate suppliers in Mumbai for aircraft gas turbine engine components, API 6A wellheads, subsea manifolds, nuclear reactor internals and gas turbine discs, with NACE MR0175 and EN 10204 3.1 certification. |
|---|---|
| Alloy Description | Precipitation-hardening Ni-52.5Cr-19Fe-3Mo-5(Nb+Ta) alloy age-hardened to γ″/γ′ phases for extreme tensile/yield strength, creep resistance to 700°C and sour-service corrosion resistance. |
| UNS / Werkstoff | UNS N07718; W.Nr. 2.4668; API 6A CRA 718 designation for sour service. |
| Key Plate Standards | ASTM B670 plate/sheet/strip; AMS 5596 sheet/plate (aerospace); NACE MR0175/ISO 15156 sour service; ASME Section II/IX weld data. |
| Thickness Range | 4.75 mm – 150 mm |
| Heat Treatment | Solution 980–1065°C + double age (718°C/8h FC to 621°C/8h) yielding 1275 MPa UTS, 1034 MPa YS minimum. |
| Target Industries | Aerospace turbines, oil/gas wellheads/subsea, nuclear reactors, gas turbine power generation, chemical pressure vessels. |
| Price | INR 5,000 – 8,500 per kg. Indicative USD 59 – 100 per kg; quoted against grade, form, size and quantity. |
UNS & Equivalent Grades
| Property | Value |
|---|---|
| UNS number | N07718 |
| Werkstoff / EN number | 2.4668 |
| Density | 8.19 g/cm3 |
| Melting range | 1260-1336 °C |
| Density (annealed and aged) | 0.297 lb/in³ (bulletin publishes no SI value for this condition) |
| Specific heat (21 °C) | 435 J/kg·°C |
| Curie temperature (annealed) | < -196 °C |
| Curie temperature (annealed and aged) | -112 °C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.0013 |
| Magnetic permeability (200 oersted at 21 °C - annealed and aged) | 1.0011 |
| Plate, sheet and strip specification | ASTM B670 / B906 / AMS 5596 / 5597 |
Identifiers and physical constants for Inconel 718. A dash means no such designation is published for this grade.
Stock & Product Availability
As Inconel 718 plate stockist in Mumbai, Aurico Alloys LLP supplies AMS 5596 age-hardened plates for aircraft gas turbine engine components, API 6A wellhead connectors, UNS N07718 subsea manifolds, ASTM B670 nuclear reactor plates and high creep-rupture gas turbine discs with full precipitation heat treatment traceability. Typical properties include 1275 MPa minimum tensile, 1034 MPa yield, 12% elongation, 331 HB hardness and Charpy impact >40 ft-lb at -253°C, supporting both high-strength aerospace and sour-service oilfield applications.
Inventory supports "Inconel 718 plate price per kg in Mumbai for aerospace-grade fasteners", "Inconel 718 plate stockist in Mumbai for sour service oilfield completion equipment", "High creep-rupture strength Inconel 718 plates for gas turbine blades and discs", "Custom cut Inconel 718 plate sizes for pharmaceutical high-temp sterilization units" and "Leading Inconel 718 alloy plate dealers in Mumbai for cryogenic tank applications".
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Ni+Co | 50.0 | 55.0 |
| Chromium (Cr) | 17.0 | 21.0 |
| Iron (Fe) | — | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 | 5.50 |
| Molybdenum (Mo) | 2.80 | 3.30 |
| Titanium (Ti) | 0.65 | 1.15 |
| Aluminium (Al) | 0.20 | 0.80 |
| Cobalt (Co) | — | 1.0 |
| Copper (Cu) | — | 0.30 |
| Carbon (C) | — | 0.08 |
| Manganese (Mn) | — | 0.35 |
| Silicon (Si) | — | 0.35 |
| Phosphorus (P) | — | 0.015 |
| Sulfur (S) | — | 0.015 |
| Boron (B) | — | 0.006 |
Composition limits for Inconel 718. 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 (Age-Hardened) | Value – Inconel 718 / UNS N07718 |
|---|---|
| Tensile Strength | ≥1275 MPa (185 ksi). |
| Yield Strength (0.2%) | ≥1034 MPa (150 ksi). |
| Elongation | ≥12%. |
| Hardness | ≥331 HB (HRC ≤35 NACE). |
| Charpy Impact (-253°C) | >40 ft-lb. |
| Creep-Rupture (650°C) | Excellent to 700°C; superior fatigue. |
Applications & Benefits
- Aerospace: Inconel 718 plates for aircraft gas turbine engine components, AMS 5596 high-strength structures/rocket motors, age-hardened jet engine exhaust/thrust reversers, aerospace-grade fasteners/rings.
- Oil & Gas: API 6A CRA wellhead/downhole tools, sour service completion equipment, UNS N07718 subsea valves/manifolds, NACE MR0175 hydrogen embrittlement resistance.
- Power & Nuclear: ASTM B670 nuclear reactor/steam generator components, high creep-rupture gas turbine blades/discs, heavy-duty chemical pressure vessels.
- Sourcing: Verified stockholders with MTC EN 10204 3.1, Inconel 718 cold rolled plates for high-precision engineering, cryogenic tank/storage applications.