① For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum wll be permitted up to a maximum of 1.50 %.
② The steel shall be considered aluminum-silicon killed when the silicon is between 0.15 % and 0.30 %, otherwise it shall be considered aluminum killed.
③ When copper is specified, a minimum of 0.20 % is required. When copper is not specified, the copper limit is a maximum requirement.
④ The sum of copper, nickel, chromium, and molybdenum shall not exceed 1.00 % on heat analysis. When one or more of these elements are specified, the sum does not apply, in which case, only the individual limits on the remaining unspecified elements will apply.
⑤ The sum of chromium and molybdenum shall not exceed 0.32 % on heat analysis. When one or more of these elements are specified, the sum does not apply, in which case, only the individual limits on the remaining unspecified elements will apply.
⑥ Titanium is permitted for Grades A through G, at the producer’s option, to the lesser of 3.4N + 1.5S or 0.025 %.
⑦ Grade H contains the strengthening elements columbium (niobium), vanadium, titanium and molybdenum added singly or in combination. The minimum requirements only apply to the microalloy elements selected for strengthening of the steel.
