Tool Joints, Over subs
The drill collars are made of modified AISI 4145H chromium molybdenum alloy steel. These drill collar bars are full-length heat treated and water quenched to obtain ASTM A-370 mechanical properties. Full mechanical and chemical mill test certifications are supplied with all drill collars. These mill test certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft.-lbs. at room temperature one inch below the surface.
1. Usage : One of the most important components of the drill string is to provide drilling bit ofpressure and the drill string rigid role.
2. Standard : API and SY/T standards.
3. Material : AISI 4145 H .
4. Types:drill pipes anddrill collars
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