Chemical composition of bearing steel

Steel Specification Tables (a) Chemical composition of bearing steel Spec C% Si% Mn% P% S% Cr% Mo% Ni N Hard- ness Chrome SAE52100 SUJ2 0.95 - 1.10 0.15 -0.35 0.50 max 0.025 max 0.025 max 1.30 -1.60 - - - 60-64 HRC Stainless Steel AISI440C SUS440C X105CrMo17 0.95 -1.20 1.00 max 1.00 max 0.04 max 0.03 max 16.0 -18.0 0.75 max - - 58-62 HRC KS440 ACD34 X65Cr13 0.60 -0.75 1.00 max 1.00 max 0.04 max 0.03 max 11.50 -13.50 0.75 max - - 58-62 HRC AISI420B SUS420J2 X30Cr13 0.26 -0.35 1.00 max 1.50 max 0.04 max 0.03 max 12.0 -14.0 - - - 53-57 HRC AISI304 SUS304 X5CrNi1810 0.08 max 0.75 max 2.00 max 0.045 max 0.03 max 18.0 -20.0 - 10.5 0.1 max 92 HRB AISI316 SUS316 X5CrNiMo17-12-2 0.08 max 0.75 max 2.00 max 0.045 max 0.03 max 16.0 -18.0 2.0 -3.0 10.0 -14.0 0.1 max 95 HRB (b) Stainless steel grades for EZO Japan bearings Stainless Steel Grade Bearing Types Comments Inner and outer rings AISI440C SUS440C X105CrMo17 S6709 upwards S6809 upwards S6907 upwards S6006 upwards S6206 upwards S6305 upwards KS440 ACD34 X65Cr13 0.6mm - 9mm bore 0.04" - 0.75" bore S6700 - S6708 S6800 - S6808 S6900 - S6906 S6000 - S6005 S6200 - S6205 S6300 - S6304 Balls AISI440C SUS440C X105CrMo17 All Shield AISI304 SUS304 X5CrNi1810 All Cage AISI304 SUS304 X5CrNi1810 0.6mm - 9mm bore 0.04" - 0.75" bore S6701 upwards S6800 upwards S6900 upwards S6000 upwards S6200 upwards S6300 upwards ribbon cage only +SMR128/SMR137 crown cage ribbon cage only S6000-2RS - S6006-2RS have nylon crown cage S6200-2RS - S6206-2RS have nylon crown cage SUS420J2 X30Cr13 0.6mm - 9mm bore 0.04" - 0.75" bore S6700 crown cage only + SMR137/ SMR128 ribbon cage crown cage only (c) Stainless steel grades for SMB China bearings Component Stainless Steel Grade Bearing Types Comments Inner and outer rings AISI440C SUS440C X105CrMo17 All Balls AISI440C SUS440C X105CrMo17 All Shield AISI304 SUS304 X5CrNi1810 All Cage AISI304 SUS304 X5CrNi1810 All