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Seamless Steel Pipe, Steel Pipe

Seamless Casing Pipe to API 5CT

Name: Seamless Steel Pipe Casing Pipe
Brand: Tianyu Metal

API 5CT casing grades from H40 to P110 with the coating already applied

Casing pipe is a seamless steel pipe with a hollow section and no joint around it, produced to API 5CT, GB/T 19830 and SY/T 6194. It is bought by well construction teams, boiler and chemical plant contractors and low and middle pressure pipeline builders who need a defined casing grade rather than general purpose tube. Offering the whole grade ladder from H40 through J55 K55 N80 L80 in 13Cr C90 T95 and P110 lets a single order cover the shallow and the deep sections of a string instead of splitting the buy between two mills. Surface treatment is applied before shipment so pipe arrives black painted, varnished, hot galvanized, 3PE or epoxy coated and ready to run.

Request A Quote Ask For Specifications

Product Name — Seamless Steel Pipe Casing Pipe
Product Form — Seamless casing pipe
Standards — API 5CT GB/T 19830 SY/T 6194
Material — H40 J55 K55 N80 L80 13Cr C90 T95 P110
Outside Diameter — 1/2 inch to 48 inch or customized

Why It Is Specified

Key Benefits of Seamless Steel Pipe Casing Pipe

Full API 5CT Grade Ladder On One Order

H40 J55 K55 N80 L80 C90 T95 and P110 are all quoted from the same source. A casing program that steps grade with depth does not need a second supplier for the deeper string.

L80 Available in the 13Cr Chemistry

L80 is offered as L80 13Cr, which is the version normally specified where carbon dioxide is present in the produced fluid.

Three Standards Referenced

The pipe is quoted against API 5CT, GB/T 19830 and SY/T 6194, so tenders written to either the API or the Chinese petroleum standards can be answered without a conversion note.

Fixed and Random Lengths

Lengths are supplied as 5.8m and 6m fixed, 12m fixed, or 2-12m random. The choice can follow the rig handling system rather than whatever the mill happens to cut.

Coating Chosen at Order Stage

Black painting, varnish, transparent oil, hot galvanizing, 3PE, epoxy coating, BE and PE finishes are applied at the mill so nothing has to be coated at the wellsite.

Seamless Wall With No Joint Around It

The body is a long pipe of steel with a hollow section and no joint around it, which keeps the wall continuous in a string that is run under axial and burst load.

Problems It Solves

What This Material Removes From Your Process

Grade Ladder Split Across Two Suppliers

Shallow string grades and deep string grades are often sourced separately, which doubles the inspection and certificate work. Quoting H40 through P110 together keeps the casing program on one order.

CO2 Service Grade Not Available Locally

L80 in the 13Cr chemistry is frequently the gap in a local stock list. It is offered here alongside C90 and T95 so the well fluid chemistry can be matched.

Coating Work Delaying the Run

Bare pipe arriving at site has to be coated before it is run. Black painting, varnish, hot galvanizing, 3PE and epoxy coating are applied before shipment.

Tender Written to Chinese Petroleum Standards

A tender citing GB/T 19830 or SY/T 6194 is awkward to answer with an API only quotation. All three standards are referenced for this product.

Length Not Matching Rig Handling

A single mill length can be hard to handle on a smaller rig. Fixed cuts of 5.8m 6m and 12m and 2-12m random are available.

Application Scenarios

Where It Is Used

Oil and Natural Gas Well Casing Strings

Surface, intermediate and production casing in petroleum and natural gas wells where grade is stepped with depth.

Drilling Programs Needing Sour or CO2 Service Grades

Strings specifying L80 13Cr C90 or T95 where the well fluid chemistry drives the grade choice.

Low and Middle Pressure Fluid Pipelines

Transfer lines carrying fluid at low and middle pressure where a casing grade pipe is used for its wall and strength.

Boiler and Power Plant Piping

Boiler circuits and associated plant piping built from seamless pipe in a defined grade.

Chemical Plant Process Lines

Chemical plant runs where an epoxy coated or 3PE coated external surface is specified against the plant environment.

Coated Casing for Corrosive Ground Conditions

Buried or splash zone sections using hot galvanized 3PE or epoxy coated pipe supplied already finished.

Who It Is For

Buyers Who Specify This Product

Well construction and drilling engineers specifying casing grade against depth and fluid chemistry
Oilfield procurement teams buying a complete H40 to P110 casing package on one purchase order
Boiler and power plant contractors buying seamless pipe in a defined petroleum grade
Chemical plant piping contractors sourcing coated seamless pipe for process runs
Pipeline contractors building low and middle pressure fluid lines
Oilfield distributors stocking API 5CT casing for regional drilling operators

Technical Data

Specifications and Technical Features

Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.

Seamless Steel Pipe Casing Pipe specifications
Product Name	Seamless Steel Pipe Casing Pipe
Product Form	Seamless casing pipe
Standards	API 5CT GB/T 19830 SY/T 6194
Material	H40 J55 K55 N80 L80 13Cr C90 T95 P110
Outside Diameter	1/2 inch to 48 inch or customized
Wall Thickness	SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS or customized
Wall Range	1.65mm to 80mm
Length	5.8m 6m fixed 12m fixed 2-12m random or customized
Surface Treatment	Black painting varnish transparent oil hot galvanized 3PE epoxy coating BE PE
Application	Low and middle pressure fluid pipeline boiler petroleum and natural gas industry drilling chemical
Place of Origin	China
Certification	ISO9001 BV SGS RoHS

Technical Features

Seamless pipe body with hollow section and no joint around it
Standards API 5CT GB/T 19830 and SY/T 6194
Grades H40 J55 K55 N80 L80 in 13Cr C90 T95 and P110
Outside diameter 1/2 inch to 48 inch or customized
Wall by schedule SCH5S to SCH160 and XS covering 1.65mm to 80mm
Lengths 5.8m and 6m fixed 12m fixed or 2-12m random or customized
Surface black painting varnish transparent oil hot galvanized 3PE epoxy coating BE and PE
Suited to low and middle pressure fluid pipeline boiler petroleum natural gas drilling and chemical duty

Materials

Lower strength casing steel supplied as H40 J55 and K55
Medium strength casing steel supplied as N80
Chromium bearing casing steel supplied as L80 in the 13Cr chemistry
Restricted yield casing steel supplied as C90 and T95
High strength casing steel supplied as P110

Certification

ISO9001
BV
SGS
RoHS
Mill test certificate supplied with each shipment

Manufacturing

How It Is Made and Processed

Seamless pipe production giving a hollow section with no joint around it
Heat treatment to reach the ordered API 5CT grade
Sizing and straightening to the ordered outside diameter and wall
End preparation as bevelled or plain per the order
Cutting to 5.8m 6m or 12m fixed or to 2-12m random
Surface treatment by painting varnish galvanizing 3PE or epoxy coating
Marking capping and bundling for export loading

Quality Control

Checks Before It Ships

Grade confirmed against the ordered API 5CT designation before release
Outside diameter and wall verified against the ordered schedule
Straightness and end condition checked before coating
Coating thickness and coverage inspected for the ordered finish
Length and bundle count checked against the packing list
Mill test certificate issued with the shipment

Customization

What We Can Change on Your Order

Casing grade selected per string section from H40 through P110
L80 supplied in the 13Cr chemistry where the well fluid requires it
Outside diameter and wall outside the standard listing on request
Length supplied as 5.8m 6m or 12m fixed or 2-12m random
Surface treatment nominated from painting varnish galvanizing 3PE or epoxy coating
Standard of supply nominated as API 5CT GB/T 19830 or SY/T 6194

Comparison

Seamless Steel Pipe Casing Pipe Against the Alternatives

Welded casing pipe	The seamless body has a hollow section with no joint around it, so there is no longitudinal weld in a wall loaded in burst and tension.
General purpose seamless pipe	This pipe is produced and certified to API 5CT casing grades rather than to a general structural or line pipe specification.
Single grade casing supply	The full H40 to P110 ladder is offered so grade can be stepped with depth on one order instead of buying a single grade for the whole string.
Pipe coated after arrival	Hot galvanizing 3PE epoxy coating and painting are applied at the mill, removing a coating contract at the destination yard.

Use Guide

Specifying Handling and Welding Notes

Select the grade against depth and well fluid chemistry before fixing the wall thickness
Use L80 13Cr C90 or T95 where the produced fluid chemistry rules out the plain carbon grades
Match the fixed or random length to the rig handling system before the order is placed
Keep thread and end protection in place through transport and yard storage
Choose the external coating against the ground and splash zone conditions at the well
Ask for the mill test certificate so each grade in the string is documented separately

Questions Buyers Ask

Seamless Steel Pipe Casing Pipe FAQ

Which API 5CT grades can you supply?

H40 J55 K55 N80 L80 in the 13Cr chemistry C90 T95 and P110. Different grades can be placed on the same order for different sections of the string.

Do you quote against GB/T 19830 as well as API 5CT?

Yes. The product is offered against API 5CT, GB/T 19830 and SY/T 6194, so a tender written to any of the three can be answered directly.

What lengths are available?

5.8m and 6m fixed, 12m fixed, or 2-12m random. Other cut lengths can be arranged if you send the requirement with the order.

What wall thickness range do you cover?

Wall is ordered by schedule from SCH5S to SCH160 and XS, covering 1.65mm to 80mm, or customized to a stated figure.

Can the casing be coated before it ships?

Yes. Black painting, varnish, transparent oil, hot galvanizing, 3PE, epoxy coating, BE and PE are all available as supplied finishes.

Is this pipe only for wells?

No. The same seamless casing pipe is used for low and middle pressure fluid pipeline, boiler, drilling and chemical plant applications.

What documentation ships with the order?

A mill test certificate covering the ordered grade, with ISO9001 BV SGS and RoHS documentation available on request.

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Need a Price on Seamless Steel Pipe Casing Pipe

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