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Constituent 20C15 Material Class 2 (IS: 4367-1991) IS: 1875-1992 Percent Percent Carbon 0.16 to 0.24 0.15 to 0.25 Manganese 1.30 to 1.70 0.60 to 0.90 Silicon 0.10 to 0.35 0.15 to 0.35 Sulphur, Max 0.050 0.050 Phosphorus, Max 0.050 0.050