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SAE AMS 6493B-2018
Steel Bars, Forgings, and Tubing, 1.0Cr - 3.25Ni - 0.40Mo (0.17 - 0.22C), Electroslag Remelted or Consumable Electrode Vacuum Remelted, Premium Aircraft-Quality
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Society of Automotive Engineers [sae]