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NON-MAGNETIC DRILL COLLAR


Description
The Non-magnetic DC produced with low carbon Cr-Mn austenitic alloy steel, featured with low magnetic permeability, good merchanical propties, intergranular anti-corrosion Chemical composition and anti-abrasion.
The Relative magnetic permeability of our products less than 1.010, and the magnetic flux density change per 100mm of inner hole less than 0.05μT when the magnetic flux density be 1*105/4π A/m.


Material
By W1813N or 1310N low Carbon Cr-Mn alloy steel, N for Nitrogen, to improve the anti-corrosion propties。

         

 

Merchanical: 

OD

Tensile Strength

Yield Stength(Mpa)

Elongation,%

         mm

      in

79,4171,4

3 1/86 3/4

≥758

≥827

≥18

177,8279,4

711

≥689

≥758

≥20

 

Specification of NMDC: 

 

OD

ID

Thread type

in

mm

in

mm

4-3/4

120,65

2
2-1/4

50,80
57
,15

NC35,
NC35,
NC38 (31/2IF)

6-1/4

158,75

2-1/4
2-13/16

57,15
71
,44

NC46
NC46
(4 IF)

6-1/2

165,1

2-1/4
2-13/16

57,15
71
,44

NC46 (4 IF)
NC46
(4 IF)

6-3/4

171,45

2-1/4

2-13/16

57,2

71,4

NC46

NC50

7

177,8

2-1/4

2-13/16

57,15

71,44

NC50 (4 1/2IF)
NC50
(4 1/2IF)

8

203,2

2-13/16
3

71,44
76
,20

6 5/8 REG
6 5/8
REG

9

228,6

2-13/16
3

71,44
76
,20

7 5/8 REG
7 5/8
REG

9-1/2

241,3

3

76,20

7 5/8 REG

10

254

3

76,20

NC70

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