DRILL COLLAR-STANDARD AND SPIRAL

TIANHE Drill Collar is manufactured from  AISI 4145H modified quenched and tempered  steel and is heat treated along its entire  length for uniform toughness and durability. Strict metallurgical tests are performed per specifications to ensure that the heat  treatment produces consistent and maximum  hardness through the depth of the bar.

Features and Benefits 

● A hardness range of 285 to 341 BHN  and a Charpy impact value of 40 ft-lbs are  guaranteed for evenly distributed 16 points in  any cross sections at room temperature;

●Connections are phosphate coated after  machining to protect the threads from corrosive elements and to prevent galling  upon initial make-up; 

● Thread roots are cold rolled on API and H-90  connections; 

● Pressed steel thread protectors are supplied  for all drill collar that are equipped with  standard connections.

When ordering please specify

● Drill collar OD and ID; 

● Overall length; 

● Connections required (size and type); 

● Special features desired, for example:  Slick or Spiral;  Stress Relief Features;  Slip and/or Elevator Recess;  Hardbanding;