Drill Collar
KOSUN Drill Collars are manufactured from AISI 4145H alloy steel. Drill collars are bored and drifted to API Spec 7-1 and fully heated to meet or exceed the mechanical property requirements of API Spec 7-1. Hardness range of 285-341HB and a charpy "V" notch impact value of 54 joules are guaranteed one inch below the surface.
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