How AMS Numbers Work
An AMS number is tied to one alloy, one product form and often one heat-treatment condition. The number does not encode the alloy, so you need a reference or the document title to decode it. That precision is useful for scrap. A forging shop’s 718 offcuts tagged “AMS 5663” are 718 in the aged condition, and the certificate will say so.
Aerospace buyers also rely on engine-maker specifications, particularly for cast superalloys. René, GTD and many MAR-M castings are bought to the engine makers’ own documents, which are not public, which is why grade identification for revert leans on chemistry and part numbers.
AMS Reference for Grades We Trade
| Specification | ASME | Product form | Grades on this site |
|---|---|---|---|
| AMS 4544 | – | Plate, sheet and strip | Monel 400 |
| AMS 4675 | – | Bar and forgings | Monel 400 |
| AMS 4676 | – | Bar and forgings | Monel K-500 |
| AMS 4911 | – | Plate, sheet and strip | Titanium Grade 5 |
| AMS 4928 | – | Bar and forgings | Titanium Grade 5 |
| AMS 4965 | – | Bar, solution treated and aged | Titanium Grade 5 |
| AMS 5384 | – | Investment castings | Udimet 500 |
| AMS 5391 | – | Investment castings | Inconel 713C |
| AMS 5536 | – | Plate, sheet and strip | Hastelloy X |
| AMS 5540 | – | Plate, sheet and strip | Inconel 600 |
| AMS 5581 | – | Seamless or welded tubing | Inconel 625 |
| AMS 5596 | – | Plate, sheet and strip | Inconel 718 |
| AMS 5599 | – | Plate, sheet and strip | Inconel 625 |
| AMS 5662 | – | Bar and forgings, solution treated | Inconel 718 |
| AMS 5663 | – | Bar and forgings, solution treated and aged | Inconel 718 |
| AMS 5665 | – | Bar and forgings | Inconel 600 |
| AMS 5666 | – | Bar, forgings and rings | Inconel 625 |
| AMS 5751 | – | Bar and forgings | Udimet 500 |
| AMS 5754 | – | Bar and forgings | Hastelloy X |
| AMS 5832 | – | Welding wire | Inconel 718 |
| AMS 5837 | – | Welding wire | Inconel 625 |
| AMS 5839 | – | Welding wire | Haynes 230 |
| AMS 5872 | – | Plate, sheet and strip | Nimonic C-263 |
| AMS 5878 | – | Plate, sheet and strip | Haynes 230 |
| AMS 5886 | – | Bar, forgings and rings | Nimonic C-263 |
| AMS 5887 | – | Rod and bar | Inconel 617 |
| AMS 5888 / AMS 5889 | – | Plate, sheet and strip | Inconel 617 |
| AMS 5891 | – | Bar and forgings | Haynes 230 |
| AMS 5915 | – | Bar and forgings | Haynes 282 |
| AMS 5951 | – | Plate, sheet and strip | Haynes 282 |
Aerospace Scrap and Traceability
Aerospace machining generates large volumes of 718 and titanium Grade 5 turnings, plus bar ends and forging offcuts. These streams are usually well documented, but the material is only as good as its segregation. One mixed bin of 718 and Ti-6Al-4V chips costs far more than it saves. See Inconel 718 turnings and titanium Grade 5 turnings.
Parts retired from service are often mutilated before release so they cannot return to service. That has no effect on melt value, but it removes part markings, so keep the release paperwork with the lot.
FAQ
What is the difference between AMS 5662 and AMS 5663?
Both cover Inconel 718 bar and forgings. AMS 5662 is solution treated; AMS 5663 is solution treated and precipitation hardened (aged).
Which AMS specification covers Inconel 625 sheet?
AMS 5599, which covers sheet, strip and plate.
Which AMS covers Ti-6Al-4V bar?
AMS 4928 covers titanium Grade 5 (Ti-6Al-4V) bars, wire, forgings and rings; AMS 4911 covers sheet, strip and plate.