GOST 380-2005, With regard to the analysis and control of chemical composition during smelting, the carbon (C) content is maintained between 0.28% and 0.37%, whilst the manganese (Mn) content is maintained between 0.50% and 0.80%. At the same time, harmful elements such as phosphorus (P) and sulphur (S) are strictly limited to 0.04% and 0.05% respectively.