Inconel 625 is a high-performance nickel-chromium-molybdenum superalloy widely used in the following fields: aerospace components, chemical equipment, marine and offshore systems, and high-temperature industrial applications.
AMS standards specify material forms, heat treatment, mechanical properties, and testing requirements. Purchasers must understand the differences between AMS 5599 and AMS 5666 to avoid specification errors and ensure performance in critical applications.
what is ams 5599 inconel 625?
AMS 5599 Inconel 625 is a specific aerospace standard (AMS) for a high-performance, nickel-chromium-molybdenum alloy (UNS N06625) known for its exceptional strength, fabricability, and superior resistance to corrosion, pitting, and high temperatures, making it ideal for marine, aerospace (jet engines, ducting), and chemical processing applications, available in forms like sheet, plate, and strip.
what is ams 5666 inconel 625 ?
AMS 5666 Inconel 625 is a high-performance, nickel-chromium alloy (UNS N06625) specified by the Aerospace Material Specifications (AMS) for demanding aerospace parts needing exceptional strength, weldability, and resistance to extreme temperatures (cryogenic to 1800°F) and corrosion (seawater, acids, chlorides). This alloy, strengthened by molybdenum and niobium, is supplied as bars, forgings, or rings in an annealed condition, offering superior toughness without needing precipitation hardening.
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AMS 5599 vs AMS 5666：Inconel 625 material
| Specification | Material Form | Heat Treatment | Key Focus |
|---|---|---|---|
| AMS 5599 | Inconel 625 bar, rod, and forgings | Solution annealed | Aerospace & high-temperature structural applications |
| AMS 5666 | Inconel 625 sheet, plate, and strip | Solution annealed + optional cold working | Chemical, marine, and industrial corrosion resistance applications |
ams 5599 vs ams 5666 :Chemical Composition (wt.%)
| Element | AMS 5599 | AMS 5666 |
|---|---|---|
| Nickel (Ni) | 58.0 – 63.0 | 58.0 – 63.0 |
| Chromium (Cr) | 20.0 – 23.0 | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 | 8.0 – 10.0 |
| Niobium + Tantalum (Nb+Ta) | 3.15 – 4.15 | 3.15 – 4.15 |
| Iron (Fe) | ≤ 5.0 | ≤ 5.0 |
| Carbon (C) | ≤ 0.10 | ≤ 0.10 |
| Cobalt (Co) | ≤ 1.0 | ≤ 1.0 |
| Titanium (Ti) | ≤ 0.40 | ≤ 0.40 |
| Aluminum (Al) | ≤ 0.40 | ≤ 0.40 |
ams 5599 vs ams 5666 : Mechanical Properties (Typical, Annealed)
| Property | AMS 5599 (Bar/Rod) | AMS 5666 (Sheet/Plate) |
|---|---|---|
| Yield Strength (0.2%) | 414 MPa | 414 MPa |
| Tensile Strength | 827 MPa | 827 MPa |
| Elongation | ≥ 30% | ≥ 30% |
| Hardness (HRB) | 95 – 100 | 95 – 100 |
| Service Temperature | Up to 980 °C | Up to 980 °C |
ams 5599 vs ams 5666 : Pricing
| Product Form | AMS Spec | Approx. Price (USD/kg) | Notes |
|---|---|---|---|
| Round Bar | AMS 5599 | 45 – 80 USD/kg | Price varies by diameter and length |
| Sheet / Plate | AMS 5666 | 40 – 75 USD/kg | Price depends on thickness, width, and quantity |
| Bulk Orders | Both | Negotiable | Higher volumes reduce per kg cost |
ams 5599 vs ams 5666 :Applications
AMS 5599
Aerospace shafts, fasteners, and high-stress components
Turbine parts
Chemical processing rods
AMS 5666
Heat exchangers, tanks, and vessels
Marine piping and seawater equipment
Industrial corrosion-resistant sheet components
Procurement Tip:
Choose based on form factor and intended mechanical/corrosion requirement, not just chemical composition.
Inconel 625 suppliers
At GNEE, Inconel 625 is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.
