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Spring Steels
Grade Chemical Composition max. by weight %
JIS G 4801 C Si Mn P S Cr V B
SUP 3 0.75-0.90 0.15-0.35 0.30-0.60 0.035 0.035 - - -
SUP 6 0.56-0.64 1.50-1.80 0.70-1.00 0.035 0.035 - - -
SUP 7 0.56-0.64 1.80-2.20 0.70-1.00 0.035 0.035 - - -
SUP 9 0.52-0.60 0.15-0.35 0.65-0.95 0.035 0.035 0.65-0.95 - -
SUP 9A 0.56-0.64 0.15-0.35 0.70-1.00 0.035 0.035 0.70-1.00 - -
SUP 10 0.47-0.55 0.15-0.35 0.65-0.95 0.035 0.035 0.80-1.10 0.15-0.25 -
SUP 11A 0.55-0.65 0.15-0.35 0.70-1.00 0.035 0.035 0.70-1.00 - 0.0005
SUP 12 0.51-0.59 1.20-1.60 0.60-0.90 0.035 0.035 0.60-0.90 - -
SUP 13 0.56-0.64 0.15-0.35 0.70-1.00 0.035 0.035 0.70-0.90 - -
Note : Throughout classes, the value of Cu as impurities shall not exceed 0.30%

Free Cutting Carbon Steels
Grade Chemical Composition by weight %
JIS G 4804 C Mn P S Pb

SUM 11 0.08-0.13 0.30-0.60 0.040 max. 0.08-0.13 -
SUM 12 0.08-0.13 0.60-0.90 0.040 max. 0.08-0.13 -
SUM 12L 0.08-0.13 0.60-0.90 0.040 max. 0.08-0.13 0.10-0.35
SUM 21 0.13 max. 0.70-0.10 0.07-0.12 0.16-0.23 -
SUM 22 0.13 max. 0.70-1.00 0.07-0.12 0.24-0.33 -
SUM 22L 0.13 max. 0.70-1.00 0.07-0.12 0.24-0.33 0.10-0.35

High Carbon Chromium Bearing Steels
Grade Chemical Composition by weight %
JIS G 4805 C Si Mn P max. S max. Cr Mo
SUJ 1 0.95-1.10 0.15-0.35 0.50 max. 0.025 0.025 0.90-1.20 -
SUJ 2 0.95-1.10 0.15-0.35 0.50 max. 0.025 0.025 1.30-1.60 -
SUJ 3 0.95-1.10 0.40-0.70 0.90-1.15 0.025 0.025 0.90-1.20 -
SUJ 4 0.95-1.10 0.15-0.35 0.50 max. 0.025 0.025 1.30-1.60 0.10-0.25
SUJ 5 0.95-1.10 0.40-0.70 0.90-1.15 0.025 0.025 0.90-1.20 0.10-0.25
Note : Other elements Ni, Cu shall not exceed 0.25%
Grade C Si Mn P S Cu Cr Al
SAE 0.98- 0.15-0.30 0.25-0.45 0.025 0.015 0.25 1.4-1.6 0.02-0.05
52100 1.10 max max max
Note : Other elements Ni, Cu shall not exceed 0.25%

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