GOST: St3Sp, St4Sp, St5Sp DIN: Ck25, Ck45, Ck60, 55Cr3, 50CrV4, 70Cr2, 100Cr6, 21CrMoV 5 7, 51CrMoV4, 42CrMo4, 36CrNiMo4, 34CrNiMo6 ASTM: A105,4140 JIS: SWRH (27~72) grade A, B