6 Articles of metal for use in the drilling of oil wells or gas wells, namely, metallic drill strings and pipes for use in the drilling of oil wells or gas wells, metallic connectors and fittings for drill strings and pipes for use in the drilling of oil wells or gas wells, pipes and tubes of metal, sleeves of metal, pilings of metal, masts of metal, connection sleeves of metal for connecting pipes and tubes, junctions of metal for pipes and tubes, junctions of metal for joining a mast to a piling, junctions of metal for connection to subsea metallic structures, articles of metal for use in the connection of pipes and tubes of metal, and subsea riser connectors of metal