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Chemical Composition

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High Carbon Chromium Bearing Steel:
Chemical Composition Unit : %         

Grade    designation C Si Mn P S Cr Mo
SUJ 1 0.95 or  1.10 0.15 or 0.35 0.50 max. 0.025 max. 0.025 max. 0.90 to 1.20 –
SUJ 2 0.95 or  1.10 0.15 or 0.35 0.50 max. 0.025 max. 0.025 max. 1.30 to 1.60 –
SUJ 3 0.95 or  1.10 0.40 or 0.70 0.90 to 1.15 0.025 max. 0.025 max. 0.90 to 1.20 –
SUJ 4 0.95 or  1.10 0.15 or 0.35 0.50 max. 0.025 max. 0.025 max. 1.30 to 1.60 0.10 to 0.25
SUJ 5 0.95 or  1.10 0.40 or 0.70 0.90 to 1.15 0.025 max. 0.025 max. 0.90 to 1.20 0.10 to 0.25

Free – Cutting Carbon Steel : 
Chemical Composition Unit : %

Grade designation C Mn P S Pb
SUM    11 0.08 – 0.13 0.30 – 0.60 0.04 max. 0.08 – 0.13 –
SUM    12 0.08 – 0.13 0.60 – 0.90 0.40 max. 0.08 – 0.13 –
SUM    21 0.13 max. 0.70 -1.00 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
SUM    23 0.09 max. 0.75 – 1.05 0.04 – 0.09 0.26 – 0.35 –
SUM   23L 0.09 max. 0.75 – 1.05 0.04 – 0.09 0.26 – 0.35 0.10 – 0.35
SUM   24L 0.15 max. 0.85 – 1.15 0.04 – 0.09 0.26 – 0.35 0.10 – 0.35
SUM    25 0.15 max. 0.90 – 1.40 0.07 – 0.12 0.30 – 0.40 –
SUM    31 0.14 – 0.20 1.00 – 1.30 0.040 max. 0.08 – 0.13 –
SUM  31 L 0.14 – 0.20 1.00 – 1.30 0.040 max. 0.08 – 0.13 0.10 – 0.35
SUM    32 0.12 – 0.20 0.60 – 1.10 0.040 max. 0.10 – 0.20 –
SUM    41 0.32 – 0.39 1.35 – 1.65 0.040 max. 0.08 – 0.13 –
SUM    42 0.37 – 0.45 1.35 – 1.65 0.040 max. 0.08 – 0.13 –
SUM    43 0.40 – 0.48 1.35 – 1.65 0.040 max. 0.24 – 0.33 –

Carbon Steel for machine structural use: 
Chemical Composition    Unit : %

Grade designation C Si Mn P S
S 10C 0.08 – 0.13 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 12C 0.10- 0.15 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 15C 0.13 – 0.18 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 17C 0.15 – 0.20 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 20C 0.18 – 0.23 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 22C 0.20 – 0.25 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 25C 0.22 – 0.28 0.15 – 0.35 0.30 – 0.60 0.030 max. 0.030 max.
S 28C 0.25 – 0.31 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 30C 0.27 – 0.33 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 33C 0.30 – 0.36 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 35C 0.32 – 0.38 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 38C 0.35 – 0.41 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 40C 0.37 – 0.43 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 43C 0.40 +0.46 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 45C 0.42 – 0.48 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 48C 0.45 – 0.51 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 50C 0.47 – 0.53 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 53C 0.50 – 0.56 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 55C 0.52 – 0.58 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 58C 0.55 – 0.61 0.15 – 0.35 0.60 – 0.90 0.030 max. 0.030 max.
S 09C K 0.07 – 0.12 0.10 – 0.35 0.30 – 0.60 0.025 max. 0.025 max.
S 15C K 0.13 – 0.18 0.15 – 0.35 0.30 – 0.60 0.025 max. 0.025 max.
S 20C K 0.18 – 0.23 0.15 – 0.35 0.30 – 0.60 0.025 max. 0.025 max.

Remarks : As per JIS G 4805 : 1999

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