Meaning
Aerospace material specification establishing cleanliness requirements for steel bars and tubing defines the test procedure for magnetic particle inspection of aircraft quality ferromagnetic alloys. Compliance with ams 2301 determines whether a batch of steel possesses a sufficiently low concentration of non-metallic inclusions to be used in critical load-bearing parts. The standard governs both the frequency and severity of allowable surface indications during quality assurance testing.
This specification excludes non-ferromagnetic alloys and parts intended for non-structural applications.
Quality Standard
Non-metallic inclusion limits are quantified through a frequency and severity rating system based on the total surface area examined. In these checks, ams 2301 requires that the sum of the severity ratings of all indications does not exceed a designated threshold determined by the product size and shape. Material failing to meet this cleanliness threshold faces immediate rejection.
This rating system provides a uniform baseline for structural integrity.
Inspection Method
Magnetic particle testing requires magnetization of a prepared steel sample to reveal linear discontinuities. Technicians using ams 2301 evaluate indications that are larger than one sixteenth of an inch. Each batch requires testing from multiple locations to represent the entire heat of steel.
Evaluation utilizes a wet method with fluorescent iron oxide powder.
Commercial Consequence
Purchasing contracts for aerospace grade steel specify compliance with this test standard to mitigate the risk of premature fatigue failure in helicopter rotors and landing gear. Buying certified ams 2301 steel ensures that the material has passed the rigorous inspection needed for flight certification. This certification reduces liability for the supplier.
