SAE AMS6493
SAE AMS6493 Steel Bars, Forgings, and Tubing, 1.0Cr - 3.25Ni - 0.40Mo (0.17 - 0.22C) Premium Aircraft-Quality, Electroslag Remelted or Consumable Electrode Vacuum Remelted
standard by SAE International, 09/28/2009
standard by SAE International, 09/28/2009