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Specifications
1.Non-Standards2.Wall thickness:38~53mm
3.Certifactes: ISO ,API 7-1
4.Moq: 2tons
5.Spiral Drill Collar DC
Product Name Integral heavy weight Drill Pipe
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 7, API 7-1 and SY/T standards.
3. Material : AISI 4145 H .
4. Types:drill pipes anddrill collars
5 Size : Wall thickness 38~53mm
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