100Cr6 Ball bearing steel (W.NR. 1.3505) CHEMICAL COMPOSITION: (analysis according to the ISO 683-17 standard) C % Si % Mn % P % 1) S % Cr % Mo % FROM 0,93 0,15 0,25 - - 1,35 - TO 1,05 0,35 0,45 0,025 0,015 1,60 0,10 1) In the cases where machinability is of primary importance, a maximum sulphur content S=0,030% can be agreed.