Product Description

Drill Collars: Usage: One of the most important components of the drill string is to provide drilling bit of pressure and the drill string rigid role. Standard: API 7, API **1 and SY/T standards. Material: AISI ***5 H or Non-magnetic material. Types: Slick drill collars / Spiral drill collars / Non-mag material drill collars Size :OD : 3 1/8�****4�, Length : *0�****1� Mechanical Property:�Slick and Spiral drill collars� Steel-making process: EAF+LF+VD, Mechanical properties are as follow. Tensile strength�Mpa��**5 Yield strength�Mpa��**8 Elongation �%��*3 Reduction of Area�%��*3 Impact�Ft.1bf(J)��*4 Hardness�HB�: *******1