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This standard specifies the requirements relating to steel, X12CrNiMoV12-3 (1.4933), 900 MPa ≤ Rm ≤ 1050 MPa, bar, De ≤ 150 mm, for aerospace applications. The committee responsible for this standard is NA 131-01-01 AA "Stähle" ("Steels") at DIN.