To provide for the assessment of additional antidumping duties prior to the effective date of an antidumping order issued under the Tariff Act of 1930 with respect to steel products.

Requires the Secretary of Commerce, in any case in which antidumping duties are imposed upon steel products of a foreign country, to assess such duties on entries made for the period that dumping occurred before the issuance of the order (as well as on entries made after the order), but in no case earlier than one year before an antidumping duty petition was filed or the Secretary initiated an antidumping duty investigation.