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China
Contact Person Mr. smith
69 ChaoYang Road, Beijing, Beijing
Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. Drill collar are manufactured strictly from API Spec.7 and SY***4 standard. Drill Collar are manufactured from AISI ***5H modified steel, and are supplied in the âas rolledâ surface finish condition. Alternative surface finishes can be provided. Full-length heat treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. A hardness range of ******1, Brinell Hrdness and Charpy âVâ notch minimum impact strength of *4Jï&frac*4;*0ft-lbï&frac*4;at *1â±3âï&frac*4;*0â±5âï&frac*4;are guaranteed one inch below the surface. We inspect all our drill collars to comply with API standards.
