According to API Spec7-1 Specifications, the material quality is 4145H that's after heat Treament,
thread hardening Treament and phosphating to batter antiseize. It also
can be produced upon customers' requirements.
Adopt OCTG, End upsetting according to AP15DP standard,
Thickening of heat Treament weeken, Grade could achieve G105 or S135,
Joint foring production blank, controllied atmosphere heat. With API Spec7-1 standard welding area adopts deformation heat treatment, weld performance with API SPEC5DP standard.