Description: It?s made from rolled
or forged AISI***5H chrome-molybdenum steel. The content of
chemical composition and microelement is controlled efficiently
throughout the whole process. ? According to its different figures
and materials, it can be divided into three
types: Type A (columnar) : made from
ordinary alloy steel, both inside and outside of the cross section
of the pipe are cyclical. Type B (spiral): made from ordinary
ally 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. Main Functions: it?s one of the most
important components of drill stem. It can provide the bit with bit
weight and improve the rigidity of drill stem. ? It?s in accordance with the
standard of SY/T********7 or API SPEC.**1.
?
