API 5CT Grade L80 Casing Pipe

API 5CT Grade L80 casing pipe is a type of steel pipe used in the oil and gas industry for casing in well construction.

API 5CT L80 casing and tubing are important materials in the petroleum industry and are available in a variety of grades, including L80-1, L80 9Cr and L80 13Cr. These pipes have a minimum tensile strength of 655 MPa and a yield strength ranging from 552 MPa to 655 MPa, making them a medium strength grade, similar to N80. L80 pipe is widely used in oil well construction, drilling and the oil and gas industry.

During use, API 5ct Grade L80 Type 1 casing and tubing require heat treatment at specific tempering temperatures to avoid the material becoming brittle. In addition, cold working operations are not recommended for L80 grade pipes after heat treatment. For oil-quenched API 5CT casing, modifications can be made by adjusting the carbon content.

Under this specification, standard API 5CT L80 well casing contains no sulfur and is a non-corrosive component. Therefore, they have been widely used in the petroleum industry, providing reliable guarantee for oil and gas extraction and transportation.

Chemical Composition Of API 5CT OCTG Casing Tubing

Carbon Steel API 5CT GR. L80 Pipes Mechanical Analysis

API 5CT GR.L80 Pipe Dimension Tolerance

Thread Types & End Connections

Casing Threads

STC (Short Round Thread)

LTC (Long Round Thread)

BTC (Buttress Thread)

Premium proprietary connections (project-specific designs)

Tubing End Finishes

NU (Non-Upset)

EU (External Upset)

IJ (Integral Joint)

Heat Treatment & PSL Levels

PSL1

Heat treatment: depends on manufacturing process (may be as-rolled or heat treated)

Inspection: visual + dimensional + basic mechanical tests

NDT: not mandatory full-body inspection

PSL2

PSL2 requires stricter quality control:

Controlled heat treatment (normalizing / quenching & tempering depending on grade)

Mandatory non-destructive testing (NDT)

Enhanced mechanical and chemical traceability

Impact testing required where applicable by specification

Corrosion Resistance & Service Conditions

L80-1 (Standard Carbon Version)

Suitable for non-sour or mildly corrosive environments

Common in conventional oil & gas wells

L80-9Cr / 13Cr (Corrosion Resistant Versions)

Suitable for CO₂ corrosion environments

Improved resistance to downhole corrosion conditions

Used in more aggressive oilfield applications

Service Limitation:
L80 suitability for sour service (H₂S) depends on project requirements, hardness control, and material specification. Proper material selection is required.

Applications of API 5CT L80 Casing Pipe

Medium to deep oil & gas wells

High-pressure production wells

CO₂ corrosive environments (9Cr / 13Cr grades)

Offshore and onshore drilling projects

High-load casing string applications

Tell Us Your Well Condition - Get Customized Casing Solution

API 5CT L80 Casing

Specification :API 5CT/ISO 11960

Material :L80, steel grade

Outer Diameter:4 1/2″-20″, (114.3-508mm)

Wall Thickness:1.0mm – 30 mm

Casing Dimensions:114.3 mm (4.5″) to 406.4 mm (16″)

Tubing Dimensions:26.7 mm (1.05″) to 114.3 mm (4.5″)

Length:max 12000mm

Seamless API 5CT Gr.L80 Steel Oil Casing

API Specification 5CT is a technical standard for tubing and piping used in well systems in the oil and gas industry. Unlike API 5L, API 5CT L80 grade pipes are divided into three product specification levels, namely - PSL-1, PSL-2 and PSL-3. L80 grade pipes are heat treated after upsetting. According to this standard, the heat treatment process will be different for different grades.

For example, API 5ct Grade l80 Type 1 casing and tubing must not be tempered below 1150°F to avoid becoming brittle. In addition, cold working is not recommended after heat treatment of L80 grade pipes.

Comparison: L80 vs N80 vs J55

Inspection & Quality Control

All L80 casing pipes are tested under API 5CT requirements:

Visual inspection (surface defects)

Dimensional inspection (OD, WT, length)

Tensile testing (yield & tensile strength)

Chemical composition analysis

Hydrostatic testing

Drift test

NDT inspection (PSL2 mandatory)

Impact testing (where required)

API 5CT OCTG certificate

Request Third-Party Inspection Report (SGS / BV)

API 5CT OCTG Supplier

Gnee pipe participated in the NECC exhibition

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OCTG Pipe Customer

OCTG pipe test equipments

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API 5CT OCTG test and inspection

FAQ

Q1: What standard governs L80 casing pipe?

API Spec 5CT (latest edition) and API Spec 5B for threading and gauging.

Q2: What is the difference between L80-1 and L80-13Cr?

L80-1 is carbon steel for general use, while L80-13Cr is a corrosion-resistant alloy used in CO₂ environments.

Q3: Is L80 suitable for sour service (H₂S)?

It depends on hardness control, PSL level, and project specification. For severe sour service, higher-grade sour service materials may be required.

Q4: What is the advantage of L80 over N80?

L80 provides higher resistance to corrosion and better performance in more demanding downhole conditions.

Q5: What thread types are available?

STC, LTC, BTC, and various premium connection systems depending on project requirements.

Q6: What manufacturing process is used?

Seamless (SMLS) is the primary method; welded pipe is limited and application-dependent.

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