Safeguard duty on hot rolled flat steel imports imposed with tiered ad valorem rates tied to CIF import price. Imposes a safeguard duty on specified hot rolled flat sheets and plates of alloy and non-alloy steel, with tiered ad valorem rates for defined import periods when imports are below a CIF price threshold; rates are offset by any anti-dumping duty. Excludes imports from developing countries except China, Ukraine and Indonesia, and lists product and grade exclusions. Defines 'import price on CIF basis' as the assessable value under section 14 of the Customs Act, 1962.