OCTG

API 5CT grades are commonly used in casing, production tubing, coupling stock, pup joints and various downhole accessories. MSC stocks a variety of sizes in tubular form in these grade categories. All grades are in compliance with API 5CT mechanical and impact testing expectations, including Ultrasonic Testing.

Chemical Composition of Common Grades

(Unless otherwise specified in the table, numerical value presents maximum)

Grade

C

Mn

Mo

Cr

Ni

Cu

P

S

Si





J55

-

-

-

-

-

-

0.030   

0.030   

-





K55

-

-

-

-

-

-

0.030

0.030

-





N80-1

-

-

-

-

-

-

0.030   

0.030   

-





N80-Q

-

-

-

-

-

-

0.030

0.030

-





L80-1

0.43   

1.90   

-

-

0.25   

0.350   

0.030   

0.030   

0.45   





C90-1

0.35

1.20

0.25-0.85

1.5

0.99

-

0.020

0.010

-





R95

0.45   

1.90   

-

-

-

-

0.030   

0.030   

0.45   





T95-1

0.35

1.20

0.25-0.85

0.4-1.5

0.99

-

0.020

0.010

-





C110

0.35   

1.20   

0.25-1.00

0.4-1.5

0.99   

-

0.020   

0.005   

-





P110

-

-

-

-

-

-

0.030

0.030

-





Q125-1

0.35   

1.35   

0.85   

1.5

0.99   

-

0.020   

0.010   

-

















Mechanical Properties of Commonly Strength Levels:

Grade

Type

Yield Strength (min)   
    Mpa

Tensile Strength (min)   
    Mpa

Total Elongation under   load
    %

Hardness (max.)
    HRC

J55

-

379-552

517

0.5

-

K55

-

379-552

655

0.5

-

N80-1

1

552-758

689

0.5

-

N80-Q

Q

552-758

689

0.5

-

L80-1

1

552-655

655

0.5

23 (241 HBW)

C90-1

1

621-724

689

0.5

25.4   (255 HBW)

R95

-

655-758

724

0.5

-

T95-1

1

655-758

724

0.5

25.4 (255 HBW)

C110

-

758-828

793

0.7

30 (286 HBW)

P110

-

758-965

862

0.6

-

Q125-1

1

862-1034

931

0.65

-