Nominal Specification for R50 – 51.67 kg/m GOST 7173-75

Carbon (C) : 0.40% to 0.58%

Manganese (Mn) : 0.75% to 0.88%

Silicon (Si) : 0.13% to 0.28%

Sulphur (S) : 0.045% to Maximum

Phosphorous (P): 0.035% to Maximum

Arsenic (Ar) : 0.13% to Maximum

Nominal Specification for R65 – 64.72 kg/m GOST 8165-75

Carbon (C) : 0.40% to 0.58%

Manganese (Mn) : 0.75% to 0.88%

Silicon (Si) : 0.13% to 0.28%

Sulphur (S) : 0.045% to Maximum

Phosphorous (P) : 0.035% to Maximum

Arsenic (Ar) : 0.13% to Maximum

Nominal Chemical Composition

Carbon (C) : 0.20% to 0.60%

Manganese (Mn) : 0.60% to 0.90%

Silicon (Si) : 0.15% to 0.35%

Sulphur (S): 0.05% to Maximum

Phosphorous (P) : 0.05% to Maximum

Arsenic (Ar) : 0.15% to Maximum