Customs duty exemption rate for flat-rolled steel imports limited to specified effective basic duty per tonne. Limits basic customs duty on specified flat-rolled iron and non-alloy steel imports to an effective basic duty of Rs. 6600 per tonne by exempting that part of the duty in the First Schedule which exceeds the amount calculated at the specified rate; applies to cold-rolled flat-rolled products of width 600 mm or more and to flat-rolled products of width less than 600 mm, both not clad, plated or coated and containing less than 0.6% carbon.