API 5CT N80Q Casing Tube LTC Thread Oil Well Casing

Casing, Tubing & Casing Pipe

API 5CT N80Q Casing Tube LTC Thread Oil Well Casing

API 5CT LTC N80Q Casing Tube is a premium oil well casing pipe engineered for reliable performance in medium and deep well drilling, completion, and production operations. Manufactured in full compliance with the API 5CT standard, it combines a quenched-and-tempered N80Q steel body with LTC (Long Thread Coupling) connections to deliver a dependable balance of strength, toughness, and pressure integrity in high-stress downhole environments.

The quenched-and-tempered N80Q grade provides consistent yield strength and improved low-temperature toughness, ensuring stable mechanical performance across the pipe body — critical where combined tension, collapse, and internal pressure loads are present. Each pipe is subject to strict dimensional inspection and available hydrostatic and drift testing, with full material traceability.

Email:

sales@imristeel.com

Phone:

+86 13646172523

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Product Detail

Chemical Component

Quick Details

Standard:

API 5CT

Grade:

N80Q

Thickness:

2.9-60mm

Thread Type:

STC BTC LTC

Outer Diameter:

Ф114.3-406

Place of Origin:

Baotou, China(Mainland)

Function:

Structural Support; Wellbore Protection

Technique:

Hot Rolled; Seamless

Certification:

API 5CT

Surface Treatmen:

According to customers request

Alloy Or Not:

length:

R1 R2 R3

Supply Ability:

( 180.0000 )Ton/Tons per year

Installation location:

Close to the open hole wall

Collapse Resistance:

≥2,000 psi

Brand:

Baotou steel

Application:

Medium and high pressure oil and gas wells

Risk of failure:

Blowouts; Formation Contamination; Borehole Deformation

Chemistry Component

Grade

Type

Min

Max

Min

Max

Min

Max

Min

Max

H40

–

0.030

–

J55

–

0.030

–

K55

–

0.030

–

N80

–

0.030

–

N80

–

0.030

–

R95

–

0.45

–

1.90

–

0.030

0.45

L80

–

0.43

–

1.90

–

0.25

0.35

0.030

0.45

L80

–

0.15

0.30

0.60

0.90

1.10

8.00

10.0

0.50

0.25

0.020

0.010

1.00

L80

13Cr

0.15

0.22

0.25

1.00

–

12.0

14.0

0.50

0.25

0.020

0.010

1.00

C90

–

0.35

–

1.20

0.25

0.85

–

1.50

0.99

–

0.020

0.010

–

T95

–

0.35

–

1.20

025

0.85

0.40

1.50

0.99

–

0.020

0.010

–

C110

–

0.35

–

1.20

0.25

1.00

0.40

1.50

0.99

–

0.020

0.005

–

P110

–

0.030

–

Q125

–

0.35

–

1.35

–

0.85

–

1.50

0.99

–

0.020

0.010

–

Mechanical Propert

Grade	Type	Total under load Elongation %	Yield strength megapascal		Tensile strength megapascal	Hardness a, C Maximum		Specified OD mm	Allowable hardness Variation
Grade	Type	Total under load Elongation %	Min	Max	Min	HRC	HBW	Specified OD mm	HRC
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	–	–	–	–
L80	1	0.5	552	655	655	23.0	241	–	–
L80	3Cr	0.5	552	655	655	23.0	241	–	–
L80	9Cr	0.5	552	655	655	23.0	241	–	–
L80	13Cr	0.5	552	655	655	23.0	241	–	–
C90	–	0.5	621	724	689	25.4	255	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05 to 25.39	5.0
								≥25.40	6.0
T95	–	0.5	655	758	724	25.4	255	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05 to 25.39	5.0
								≥25.40	6.0
C110	–	0.7	758	828	793	29	279	≤12.70	3.0
								12.71 to 19.04	4.0
								19.05o to 25.39	5.0
								≥25.40	6.0
P110	–	0.6	758	965	862	–	–	–	–
Q125	–	0.65	862	1034	931	b	–	≤12.70	3.0
								12.71 to 19.04	4.0
								≥19.05	5.0

Color Discrimination

Grade	Type	Straps for products longer than 1.8 meters Quantity and color	Coupling color
Grade	Type		The whole coupling	Brand
H40		No belt or black belt, to be selected by the manufacturer	not have	Same as for the pipeline
J55		A sea of green	Bright green	One white
K55		Two emerald green	Bright green	not have
N80	1	One red	red	not have
N80	Q	One is red, the other emerald green	red	green
R95		One brown	brown	not have
L80	1	One red, one brown	red	One brown
L80	3Cr	One red and one white	red	One white
L80	9Cr	One red, one brown, two yellow	not have	Two yellows
L80	13Cr	One red, one brown and one yellow	not have	One yellow
C90		A purple one	purple	not have
T95		One silver	silvery	not have
C110		One white, two brown	white	Two brown
P110		One white	white	not have
Q125		One orange	orange	not have