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Product Show
Drill Collar

Drill Collars are manufactured from AISI 4145H or 36CrNiMo4 modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes can be provided.


Material: AISI 4145H or AISI 4145H Modified

Type: slick and spiral

Length:
10~32

OD size range: 3-1/8"~12"

Connection Thread: IF  FH  REG

Trepanning and Heat treatment:

Drill collars are trepanned and drifted to API Spec 7. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. A hardness range of 285-341, Brinell Hardness and Charpy gV h notch minimum impact strength of 40 ft-lb at 70OF are guaranteed one inch below the surface.

Mechanical Property

OD

inch

Yield strength 0.2Mpa

Tensile strength b Mpa

Elongation 4%

Hardness

(brinell)

IMPACT VALUE

(CHAPPY-V)

3 1/8~6 3/4

758

965

13

285~341

54

7~12

689

930

 
 
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