Safeguard duty on seamless pipes to phase down over prescribed periods, protecting domestic industry from injurious imports. Imposition of safeguard duty on imports of seamless pipes and tubes falling under specified tariff items, applied as staged ad valorem rates over successive periods, following a finding of serious injury to domestic producers. The notification excludes imports from developing countries (with a specific exception) and lists defined product exclusions including certain alloy-steel specifications, patented premium connections and threaded tubes of specified grades, 13 chromium grade tubes not otherwise excluded, and drill collars.