① Silicon may be specified by the purchaser as 0.10 % maximum. The need for 0.10 % maximum generally relates to severe cold-formed parts.
② Residual elements.
③Standard alloy steels can be produced with a lead range of 0.15 % to 0.35 %. Such steels are identified by inserting the letter \"L\" between the second and third numerals of the AISI number, for example, 41L40. A cast or heat analysis is not determinable when lead is added to the ladle stream.