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High Speed Of Oil Field Drill Collars-CONTINENTAL STEEL CO.,LTD
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High Speed Of Oil Field Drill Collars

Oct 23, 2023

High Speed Of Oil Field Drill Collars

Chemical composition

Grade

Chemical composition %

C

Si

Mn

P

S

Cr

Mo

Ni

With

To the

V

4145HMOD

0.42   ～

0.49

0.15 ～0.35

1.00 ～1.25

≤ 0.025

≤ 0.025

1.00 ～1.35

0.30-0.35

≤ 0.25

≤ 0.35

≤ 0.05

0.03 ~ 0 . 08

 

Mechanical properties of drill collars

Outer diameter range

Yield strength R t

Tensile strength R m

Elongation A%

Brinell hardness HB

Charpy impact energy AkvJ

mm

in

MPa

MPa

      

79.4 — 171.4

3 1/8 — 6 3/4

≥758

≥965

≥13

285 — 341

≥54 or ≥70

177.8 — 279.4

7 — 11

≥689

≥930

≥13

285 — 341

≥54 or ≥70

Mechanical properties of drill collars

Outer diameter range

Yield strength R t

Tensile strength R m

Elongation A%

Brinell hardness HB

Charpy impact energy AkvJ

mm

in

MPa

MPa

      

79.4 — 171.4

3 1/8 — 6 3/4

≥758

≥965

≥13

285 — 341

≥54 or ≥70

177.8 — 279.4

7 — 11

≥689

≥930

≥13

285 — 341

≥54 or ≥70

 

Chemical composition

Grade

Chemical composition %

C

Si

Mn

P

S

Cr

Mo

Ni

With

To the

V

4145HMOD

0.42   ～

0.49

0.15 ～0.35

1.00 ～1.25

≤ 0.025

≤ 0.025

1.00 ～1.35

0.30-0.35

≤ 0.25

≤ 0.35

≤ 0.05

0.03 ~ 0 . 08

 

Drill collar specifications OD ID Length Length Chamfer diameter Champher Reference curved Bending strength Proportion
mm in mm in   mm Intensity ratio
NC23-31 79.4 3 1/8 31.8 11/4 9150 76.2 2.57:1
NC26-35(2 3/8IF) 88.9 3 1/2 38.1 11/2 9150 82.9 2.42:1
NC31-41 (2 7 / 8IF) 104.8 4 1/8 50.8 2 9150 100.4 2.43:1
NC35-47 120.7 4 3/4 50.8 2 9150 114.7 2.58:1
NC38-50 (3 1 / 2IF) 127.0 5 57.2 2 1/4 9150 or 9450 121.0 2.38:1
NC44-60 152.4 6 57.2 2 1/4 9150 or 9450 144.5 2.49:1
NC44-62 158.8 6 1/4 57.2 2 1/4 9150 or 9450 149.2 2.91:1
NC44-62(4IF) 158.8 6 1/4 71.4 2 13/16 9150 or 9450 150.0 2.63:1
NC46-65(4IF) 165.1 6 1/2 57.2 2 1/4 9150 or 9450 154.8 2.76:1
NC46-65(4IF) 165.1 6 1/2 71.4 2 13/16 9150 or 9450 154.8 3.05:1
NC46-67(4IF) 171.4 6 3/4 57.2 2 1/4 9150 or 9450 159.5 3.18:1
NC50-67(4 1/2IF) 171.4 6 3/4 71.4 2 13/16 9150 or 9450 159.5 2.37:1
NC50-70(4 1/2IF) 177.8 7 57.2 2 1/4 9150 or 9450 164.7 2.54:1
NC50-70(4 1/2IF) 177.8 7 71.4 2 13/16 9150 or 9450 164.7 2.73:1
NC50-72(4 1/2IF) 184.2 7 1/4 71.4 2 13/16 9150 or 9450 169.5 3.12:1
NC50-77 196.8 7 3/4 71.4 2 13/16 9150 or 9450 185.3 2.70:1
NC50-80 203.2 8 71.4 2 13/16 9150 or 9450 190.1 3.02:1
6 5/8REG 209.6 8 1/4 71.4 2 13/16 9150 or 9450 195.7 2.93:1
NC61-90 228.6 9 71.4 2 13/16 9150 or 9450 212.7 3.17:1
7 5/8REG 241.3 9 1/2 76.2 3 9150 or 9450 223.8 2.81:1
NC70-97 247.6 9 3/4 76.2 3 9150 or 9450 232.6 2.57:1
NC70-100 254.0 10 76.2 3 9150 or 9450 237.3 2.81:1
8 5/8REG 279.4 11 76.2 3 9150 or 9450 266.7 2.84:1
OCTG - Drill Stem SubBack to Products Non-magnetic high strength drill collar

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