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SAE AMS 6274S-2021
Steel, Bars, Forgings, and Mechanical Tubing 0.50Cr - 0.55Ni - 0.20Mo (0.18 - 0.23C) (SAE 8620)
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Society of Automotive Engineers [sae]