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Material
SFMC offers both integral and friction welded types of heavy weight drill pipes. The material of integral HWDP is manufactured from one piece of AISI 4145H solid bar, fully heat treated, all physical properties are conform with API Spec 7-1 latest edition. The welding HWDP is assembly by two pieces of tool joints and one piece of central pipe by inertial friction welding. The tool joints are manufactured from AISI 4145H or 4137H alloy steel and the central pipe is manufactured from AISI 1340 alloy steel. The mechanical and chemical property of tool joints and central pipe are conformity to API Spec 7-1 latest edition.
Mechanical properties of SFMC HWDP

Traceability
The serial number is stamped on each HWDP body to guaranteen the traceaility. All machining and inspection information related to the products will be recorded.
Rigid Inspection Procedures
All SFMC’s HWDPs are inspected to comply with API standards and our own internal specifications. These inspections include visual dimensional checks, ultrasonic inspections, chemical composition and mechnical properties tests.

Cold rolled
SFMC HWDPs’ thread roots and stress relief features are cold rolled, which is helpful to reduce the fatigue failure of threads by minimizing crack initiation.