Steel Bars, Forgings, Mechanical Tubing and Forging Stock 4.0Cr - 4.2Mo - 1.0V (0.77 - 0.85C) (M-50) Premium Aircraft-Quality for Bearing Applications Consumable Electrode Vacuum Melted AMS6490K

DOI: https://doi.org/10.4271/AMS6490K

Issuing Committee: AMS E Carbon and Low Alloy Steels Committee

Publisher: SAE International

Pages: 9

Rationale: AMS6490K is the result of sampling issues identified after the last revision of the specification and incorporates changes from a full review. The revision updates the Title to match the Scope, adds composition reporting information (see 3.1.1), reorders to reflect manufacturing route (see 3.3.1.1), updates macrostructure requirements (see 3.4.1 and 8.8), revises decarburization test methods (see 3.4.5.5), adds an ultrasonic test option (see 3.5.1), clarifies and updates testing and sampling for UT and other tests (see 4.2.1, 4.3.1, 4.3.2, 4.3.3, 4.5.1, and 4.5.3), addresses stock removal (see 8.4), and updates the prohibition of unauthorized exceptions (see 4.5.4 and 8.7).