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Casing & Tubing

Casing & Tubing


Diameter :from 4 1/2 inch  to 20 inch  (48.26mm - 508mm) ( Casing)

Size: OD: 48.26mm-114.3mm ( Tubing)
Nominal Weight: from 9.5 lb/ft  to 169 lb/ft, from 9.5 ppf  to 169 ppf
Lenght: R1, R2, R3


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  • Product Description
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Grades of Casing pipe:

  • API 5CT H40
  • API 5CT J55
  • API 5CT K55
  • API 5CT M65
  • API 5CT N80 (1,Q)
  • API 5CT L80 (9Cr,13Cr)
  • API 5CT C90
  • API 5CT T95
  • API 5CT P110
  • API 5CT Q125


Sizes of Casing pipe:
Diameter :from 4 1/2 inch  to 20 inch  (48.26mm - 508mm)
Nominal Weight: from 9.5 lb/ft  to 169 lb/ft, from 9.5 ppf  to 169 ppf
 Lenght: R1, R2, R3

Types of Casing pipe:
Seamless casing (small-diameter, medium-diameter)
ERW casing (medium-diameter)
Casing nipple
Casing coupling

Applications of casing pipe: 

oil well extracting casing
borehole casing
borewell casing

Connections of casing pipe
API 5CT is applicable to following connections which complied with API SPEC 5B:
• SC: Short round thread casing
• LC: Long ound thread casing
• BC: Buttress thread casing
• NU: Non-upset tubing
• EU: External upset tubing
• IJ: Integral tubing connections

4 Groups of Grade
• Group 1: All casing and tubing in Grades with H, J, K, N and R
• Group 2: All casing and tubing in Grades with C, L, M and T
• Group 3: All casing and tubing in Grade P
• Group 4: All casing in Grade Q



Casing Pipe Finishing Process



Chemical Composition of API 5CT steel casing and tubing pipes:

Chemical composition,mass fraction(%)
Group Grade Type C Mn Mo Cr Ni Cu P S Si
Min. Max. Min. Max. Min. Max. Min. Max. Max. Max. Max. Max. Max.
1 H40 0.03 0.030
J55 0.03 0.030
K55 0.03 0.030
N80 1 0.03 0.030
N80 Q 0.03 0.030
R95 0.45 1.90 0.03 0.030  0.45
2 M65 0.03 0.030
L80 1 0.43 1.90 0.25 0.35 0.03 0.030  0.45
L80 9Cr 0.15 0.30 0.60 0.90 1.10 8.00 10.00 0.50 0.25 0.02 0.010 1.00
L80 13Cr 0.15 0.22 0.25 1.00 12.00 14.00 0.50 0.25 0.02 0.010 1.00
C90 1 0.35 1.20 0.25 0.85 1.50 0.99 0.02 0.010
T95 1 0.35 1.20 0.25 0.85 0.40 1.50 0.99 0.02 0.010
C110 0.35 1.20 0.25 1.00 0.40 1.50 0.99 0.02 0.005
3 P110 0.03 0.030
4 Q125 1 0.35 1.35 0.85 1.50 0.99 0.02 0.010

  • a.The carbon content for L80 may be increased up to 0.50% maximum if the product is oil-quenched.
  • b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17,78mm.
  • c.The carbon content for R95 may be increased up to0.55% maximum if the product is oil-quenched.
  • d.The molybdenum content for T95 Type 1 may be decreased to 0.15% minimum if the WT is less than 17,78mm.
  • e. For EW Grade P110,the phosphorus content shall be 0.020% maximum and the sulfur content 0.010% maximum
  • NL=no limit.Elements shown shall be reported in product analysis.



Mechanical Properties of API 5CT steel casing and tubing pipes:

Mechanical Properties
Group Steel Grade Type Total Yield Strength (Mpa) Tensile Strength (Mpa) Hardness max.
% min. max. MPa HRC HWB
1 H40 0.5 276 552 414
J55 0.5 379 552 517
K55 0.5 379 552 655
N80 1 0.5 552 758 689
N80 Q 0.5 552 758 689
R95 0.5 655 758 724
2 M65 0.5 448 586 586 22 235
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 1 0.5 621 724 689 25.4 255
T95 1 0.5 655 758 724 25.4 255
C110 0.7 758 828 793 30 286
3 P110 0.6 758 965 862
4 Q125 1 0.65 862 1034 931
  • a.In case of dispute,laboratory Rockwell C hardness testing shall be used as the referee method.
  • b.No hardness limits are specified,but the maximum variation is restricted as a manufacturing control in accordance with API 5CT.



Size table of casing pipe

Outside Diameter (Inches)

Available Poundage (Pounds Per Foot)

4-1/2

9.50 PPF to 15.10 PPF

5

11.50 PPF to 24.10 PPF

5-1/2

14.00 PPF to 43.10 PPF

6-5/8

20.00 PPF to 32.00 PPF

7

17.00 PPF to 57.10 PPF

7-5/8

24.00 PPF to 55.30 PPF

7-3/4

46.10 PPF

8-5/8

24.00 PPF to 49.00 PPF

9-5/8

32.30 PPF to 75.60 PPF

10-3/4

32.75 PPF to 85.30 PPF

11-3/4

42.00 PPF to 71.00 PPF

13-3/8

48.00 PPF to 72.00 PPF

16

65.00 PPF to 109.00 PPF

18-5/8

87.50 PPF

20

94.00 PPF to 133.00 PPF


Size table of tubing

Outside Diameter (Inches)

Corresponding Poundage (Pounds Per Foot)

1.050

1.14 PPF to 1.54 PPF

1.315

1.70 PPF to 2.24 PPF

1.660

2.09 PPF to 3.07 PPF

1.900

2.40 PPF to 5.15 PPF

2.063

3.24 PPF to 4.50 PPF

2-3/8

4.00 PPF to 7.45 PPF

2-7/8

6.40 PPF to 11.50 PPF

3-1/2

7.70 PPF to 17.00 PPF

4

9.50 PPF to 22.20 PPF

4-1/2

12.60 PPF to 26.10 PPF


Marking on casing pipe


Casing pipe are in a warehouse


Casing pipe are in operation at yard