9Cr L80 Steel Tube

Manufactured to API specification 5CT. This is a controlled yield strength material with a hardness testing requirement. Used in wells with carbon dioxide environments.

Available in casing dimensions of 114.3 mm (4.5″) to 339.7 mm (13.38″)

Available in tubing dimensions of 60.3 mm (2.38″) to 114.3 mm (4.5″)

Product Group:

OCTG and Linepipe

Chemical Composition

C

Mn

Mo

Cr

Ni

Cu

Ti

P

S

Si

V

Al

Min

–

0.300

0.900

8.000

–

–

–

–

–

–

–

–

Max

0.150

0.600

1.100

10.000

0.500

0.250

–

0.020

0.010

1.000

–

–

Mechanical Properties

Tensile Strength	655 MPa min	95,000 psi min
Yield Strength	552 MPa min	655 MPa max
	80,000 psi min	95,000 psi max
Total Elongation Under Load	0.500 %	–
Hardness	23 Max HRC	241 Max HBW

API 5CT Production Tubing Size

Nominal dimension（in）	O.D(No thickened) mm	I.D(No thickened) （mm）	O.D(Thickened) mm	I.D(Thickened) mm	Coupling O.D(No thickened) mm	Coupling O.D thickened) mm
1 1/2	48.3	40.3	53.2	40.3	55	63.5
2 3/8	60.3	50.3	65.9	50.3	73	78
2 7/8	73.0	62.0	78.6	62.0	89.5	93
3 1/2	88.9	75.9	95.25	75.9	107	114.5
4	101.6	88.6	107.95	88.6	121	127
4 1/2	114.3	100.3	120.65	100.3	132.5	141.5

API 5CT Production Casing Size

O.D mm(in)	Coupling O.D (mm)	I.D (mm)	Size (mm)	O.D mm(in)	Coupling O.D (mm)	I.D (mm)	Size (mm)
114.3 （4 1/2）	127.0	103.9	100.7	177.8 （7）	194.5	166.1	162.9
		102.9	99.7			164.0	160.8
		101.6	98.4			161.7	158.5
		99.6	96.4			159.4	156.2
127 （5）	141.3	115.8	112.6	193.7 （7 5/8）	215.9	178.5	175.3
		114.1	111.0			177.0	173.8
		112.0	108.8			174.6	171.5
		108.6	105.4			171.8	168.7
139.7 （5 1/2）	153.7	127.3	124.1	219.1 （8 5/8）	244.5	205.7	202.5
		125.7	122.6			203.7	200.5
		124.3	121.1			201.2	198.0
		121.4	118.2			198.8	195.6

What’s the difference between API 5CT L80-1, L80-9Cr and L80-13Cr?

API 5CT L80 type 1, type 9Cr and type 13Cr have the same mechanical properties and delivery condition, the difference lies in the term of use, production difficulty and price.

• Uses: L80-1 is used in the H2S condition, while L80-9Cr and L80-13Cr are used for the CO2 environment such as heavily corroded well, are the casing tubing with high corrosion resistance. In the corrosive environment in which carbon dioxide predominates, Super 13Cr has a higher corrosion resistance than L80-13Cr.
• Price: L80-1 is general oil tubing, with relatively high price, the L80- 9Cr and L80-13Cr apply to more complicated geological conditions and runs down deeper into the well.
• API color code (bands): 1 red + 1 brown (L80), 1 red + 1 brown + 2 yellow (L80 9Cr), 1 red + 1 brown + 1 yellow (L80 13Cr)

Reference Inspection for L80 9Cr Casing and Tubing

Visual inspection for pipe surface
Dimension check
Mechanical test on tensile strength, yield strength and elongation
Chemical analysis
NDT test including Magnetic particle, Ultrasonic Test, Hydrostatic Test
Charpy impact test
Flattening tests
Hardness test
Drift test
Thread ends check with thread gauge and coupling check

None Destructive Test

For Grade N80Q, L80, R95 required full-body, full-length NDE of casing and tubing. All pipe shall be inspected for the detection of longitudinal imperfections on the outside and inside surfaces to accepted by level L4 by one or more of the following methods:

709. a) Ultrosonic testing in accordance with ISO 9303 or ASTM E213;
     B) Flux leakage testing in acoordance with ISO 9402 or ASTM E570;
     c) Eddy current concentric coil testing in accordance with ISO 9304 or ASTM E309;
     d) For pipe outside surface, magnetic particle inspectoin in accordance with ISO 13665 or ASTM E709.

Bare steel thread protectors shall not be used on Grade L80 Types 9Cr and 13Cr Tubulars.

Surface Condition – Grades L80 9Cr

The internal surface of the pipe shall be free from scale after the final heat treatment.

Additional requirements for PSL-2 and PSL-3 products are specified in API 5CT Annex H.

L80 identification of color band

One red, one brown marked for L80-1. Pipe marked with L.
One red, one brown, two yellow marked for L80 9Cr. Simplified marking L9.
One red, one brown, one yellow marked for L80 13Cr. Simplified marking L13.

Special clearance couplings shall also have a black band.
Seal-ring coupling shall also have a blue band.

API 5CT Standard Scope

API 5CT standard specifies the technical delivery conditions for steel pipes (casing, tubing and pup joints), coupling stock, coupling material and accessory material and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this Standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40, L-80 9Cr and C110, are contained in Annex H.
For pipes covered by this Standard, the sizes, masses and wall thicknesses as well as grades and applicable endfinishes are listed in API 5CT Tables C.1 and C.2 and Tables E.1 and E.2

Connection type, ends and Couplings

Casing and tubing ends type are different where for casing usually BTC and tubing with EUE or NU, threads comply with API 5B.

L80 tubing connections with regulare and special clearance

EUE: External upset, tubing ends have an exeternal upset with a larger diameter and thickness than tubing body
NU: Non upset, tubing ends same diameter and thickness with tubing body

L80 casing pipe connection types

Common use connection BTC, buttress thread marked with BC
LC: Long round thread
SC: Short round thread
Premium connections like Vam Top, New Vam, HYD, and other gas tight thread
Customized connection threads as per client requirement

Dimension and tolerances

Length Range:

R1: 4.88 to 7.62 meters, permissible variation max 1.83 meters, and permissible length min 5.49 meters.
R2: 7.62 to 10.36 meters.
R3: 10.36 to 14.63 meters.

Outer diameter tolerance:

For pipes below 4-1/2 inch, tolerances +/- 0.79mm or 0.031 inch
For pipes equal and above 4-1/2 inch, tolerances +1% and -0.5% of pipe diameter

Wall thickness tolerance – 12.5%.

Imperfections:

Maximum permissible depth of linear imperfections, external and internal imperfections 12.5 of wall thickness. In case required 5% also could be adopted for P110 grade.