Non-Magnetic Drill Collars are made from Cr-Mn Stainless Steel. This material is proved by the mechanical properties test that the hardness, toughness, impact value and corrosion resistance are up to the standards.
In addition, the material provides good low magnetic permeability and excellent mechanical machining properties.
MAGNETIC PERMEABILITY (magnetic intensity= 1 ×105/4 π Nm)

 

Max. value:1.010

Average value:μ≤1.005

Magnetic gradiient:(hot point)

Max. Value :△B≤0.05

 

                                                                                                                                               MECHANICAL PROPERTIES

YIELD STRENGTH (AT 0.2%)		TENSILE STRENGTH		ELONGATION %	REDUCTION OF AREA %	CHARPY IMPACT VALUE
min MPa	min psi	min MPa	min psi	25	50	N.m	lb.ft
689	99,900	823	119,300			68	50

                                                                                              STANDARD                 SPECIAL SPIRAL                NON-MAGNETIC

                                                                                          DRILL COLLAR                DRILL COLLAR                   DRILL COLLAR

WHEN INQUIRING or ORDERING, PLEASE SPECIFY:

1. OutsideDiameter and Inside Diameter.

2. Length.

3. Connectiontype.

4. Stressrelief grooves.

5. Elevatorand Slip recess.(Up to api rp 7g).

6. Specialrequirements (magnets, special mark and spiral grooves).

Note:

OtherNonmagnetic products are also available including Short Collars, Integral HWDP,Subs and Stabilizers.