Drill collar

Date: 04 Jan 2010

Drill collars(Type A,B andC)are manufactured according to API and SY/T standards .Drill Collars (Type A and B) are made of 4145H chromium molybdenum alloy steel ,chemical composition and residual elements are well controlled. 

Drill collars Type c (non-magnetic)are made from low carbon austenitic alloy abtained  by combining a proprietary chemical  anylysis  and a rotary hammer forging process with low magnetic permeability excellent machineability. 

Each drill collar is fully inspected by internal inspection dept.All data obtained are recorded on the inspection certificate furnished with eath drill collar. 
API monogram ,serial number , OD ,ID ,type and size of connections are stamped on recessed mill flats. 

Drill collars are available in lengths from 10 to 31 feet and outside diameter from 3 1/8" to 11"

Contact information:
Shanghai Kensong Mechanical Technology Co., Ltd
Room 418, Yunsong Tower, No.2025 West Zhongshan Road, Shanghai. China[200235]
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