Unified Requirements for Hull Structural Steels and Some Problems on Their Welding Procedures

Grade A rimming steel may be accepted subject to limitations by special agreement with the Society. Note 2.-For Grade A in thicknesses over 1/2 in. (12.5 mm.) the manganese content shall not be less than 2.5 times the carbon content. Note 3.-For Grade B when the silicon content is 0.15 per cent or more (killed steep the minimum manganese content may be reduced to 0.60 per cent. Note 4.-For Grade C the determination of grain size may be alternatively substituted by a suitable impact test agreed between the Society and the Stcelmaker. Note 5.-For Grades B, C, D, and E, the sum of carbon content plus 1/6 of the manganese content shall not exceed 0.40 per cent.