Sell Drill collar

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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 7-1 and SY/T standards.

Material :
AISI 4145 H or Non-magnetic material.

Types:
Slick drill collars / Spiral drill collars / Non-mag material drill collars

Size :
OD : 3 1/8---11, Length : 10---31

Mechanical Property:
Mechanical Property of Slick and Spiral drill collars:
OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation
(%) Hardness
(HB) Impact Test(J)
mm in
79.4~171.4 31/8~63/4 >=758 >=965 >=13 285~341 >=54
177.8~279.4 7~11 >=689 >=930 >=13 285~341 >=54


Mechanical Property of Non-mag Drill Collars
OD Range Yield Strength(MPa) Tensile Strength(MPa) Elongation (%) Hardness
(HB) Impact Test(J)
mm in
79.4~171.4 31/8~63/4 >=758 >=827 >=18
177.8~279.4 7~11 >=689 >=758 >=20