Product Description

Drill collar:shanxiweigao at ***** Ф*9 Ф**5 Ф**1 Ф**6 Ф**9 Ф**5 Ф**8 Ф**3 It's made from rolled or forged AISI***5H chrome-molybdenum steel. The content of chemical composition and microelement is controlled effectively throughout the whole process. According to its different figures and materials, it can be divides into three types: Type A (columnar): made from ordinary alloy steel, both inside and outside of the cross section of the pipe are cycloidal. Type B (spiral): made from ordinary alloy steel, with a spiral chute on the outer surface of the pipe Type C (non-magnetic): made from stainless alloy-steel of low magnetic permeability, both inside and outside of the cross section of the pipe are rounded.