Galvanized Seamless Rectangle Steel Pipe
Jointless hollow section with a zinc coated surface in schedule wall thicknesses
Specifications
Seamless Steel Pipe for Fluid and Structural Service
Hollow section pipe with no joint around it for pressure fluid drilling and heavy wall structural duty
Seamless steel pipe is a long pipe of steel with a hollow section and no joint around it which is why it is chosen wherever a longitudinal weld is not wanted. This part of the steel tube range runs from plain round seamless pipe through galvanized seamless pipe seamless square pipe and seamless rectangle pipe to precision seamless tube stainless seamless pipe casing pipe drill pipe and pipeline pipe. Outside diameter starts at 21.3mm and runs to 48 inch and wall is ordered by schedule from SCH5S through SCH160 and XS which covers 1.65mm to 80mm. Taking the round line the hollow sections and the coated versions from one mill keeps a single certificate trail across a project instead of three.
Full Range
All 12 Products in Seamless Steel Pipe
Hollow section pipe with no joint around it for pressure fluid drilling and heavy wall structural duty Items here also sit under Galvanized Steel Pipe.
Galvanized Seamless Square Steel Pipe
Jointless square section with heavy schedule walls and a zinc coated surface
Specifications
Galvanized Seamless Steel Pipe
Galvanized seamless pipe in A53 A106 A333 and S355 grades to fixed or random lengths
Specifications
Seamless Square Pipe
Square hollow section with no longitudinal joint for machine frames and heavy wall duty
Specifications
Seamless Steel Pipe
Hollow section pipe with no joint around it for pressure and low temperature service
Specifications
Seamless Steel Pipe Big Diameter Thickness
Big bore heavy wall seamless pipe for high pressure headers manifolds and mechanical bores
SpecificationsSeamless Rectangle Pipe
Rectangular hollow section with no joint around it for frames columns and structures
SpecificationsPrecision Seamless Steel Pipe
Cold drawn and cold rolled seamless tube with a bright bore and tightly held diameters
Specifications
Stainless Seamless Steel Pipe
Pierced from round bar with no weld seam across the section for higher pressure duty
Specifications
Seamless Steel Pipe Drill Pipe
Hollow section drill pipe with no joint around it for fluid media transport duty
Specifications
Seamless Steel Pipe Casing Pipe
API 5CT casing grades from H40 to P110 with the coating already applied
Specifications
Seamless Steel Pipe Pipeline Pipe
Line pipe for oil and gas transmission with ends prepared before it leaves the mill
SpecificationsProblems Solved
What This Range Is For
Weld Seam Refused by the Line Class
Some pressure and pipeline specifications will not accept a longitudinal weld. Seamless pipe has no joint around it so the seam never becomes an inspection argument.
Wall Called Out by Schedule Not by Millimetres
Piping drawings state SCH40 or SCH80 while stockists quote millimetres. Ordering against the schedule list from SCH5S to SCH160 and XS keeps the conversion error out of the purchase order.
One Project Carrying Several Standard Families
A line list can mix ASTM JIS and EN designations. A53 A106 A333 S355JR S355JO 355J2 and the JIS and EN BS grades are quoted from the same stock so one supplier covers the whole list.
Coating Arranged After Delivery
Sending bare pipe out to a galvanizer adds handling and a second freight leg. Galvanized seamless round square and rectangle pipe arrives with the surface already coated.
Hollow Sections Bought Away From the Round Line
Seamless square and rectangle pipe share the material list with the round product so the structural steel and the fluid line ship on one booking.
Who Buys It
Buyers Who Order From This Range
- Pipeline contractors buying transmission pipe against an ASTM grade list
- Drilling contractors specifying drill pipe to API SPEC 5DP and API SPEC7
- Plant and boiler piping fabricators working from schedule wall callouts
- Hydraulic cylinder and machined component makers needing precision seamless tube
- Structural fabricators using seamless square and rectangle sections on heavy wall members
- Pipe stockists covering round galvanized and stainless seamless in one container
Core Advantages
Why Source This Range From Tianyu Metal
No Longitudinal Joint
The pipe is formed as a hollow section with no joint around it so there is no seam to test allow for or explain to an inspector.
Full Schedule Range on the Wall
Wall is available as SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS which spans 1.65mm to 80mm and custom wall is possible.
Round Square and Rectangle in One Family
Seamless square pipe and seamless rectangle pipe are made the same way as round pipe so a frame and a pressure line can be specified on the same enquiry.
Grades Across Three Standard Families
ASTM A36 A53 Gr. A Gr. B A106 GR.A GR.B A333 GR1 GR3 GR6 with JIS SS330 SS440 SS490 SPHD SPHE and EN BS S185 S235 S235JR S235 G2H S275 S275JR S355JRH S355J2H are quoted.
Drilling and Well Grades
Drill pipe is supplied to API SPEC 5DP and API SPEC7 in G105 or S135 with Nc38 and Nc50 connections and casing pipe is available from the same range.
Galvanized Surface Option
The same seamless round square and rectangle sections can be supplied galvanized for outdoor buried and damp service.
Application Scenarios
Where This Range Ends Up
Oil and Gas Transmission
Pipeline pipe moving oil and natural gas where the medium travels under pressure and the line is inspected as a system.
Drilling and Well Casing
Drill pipe used for the transportation of fluid media on the rig and casing pipe run into the hole where external load acts on the wall.
Low Temperature Piping
Lines in A333 GR1 GR3 and GR6 where the service sits below ambient and impact behavior is written into the specification.
Plant Steam and Heat Transfer
A106 GR.A and GR.B pipe on boiler and process lines ordered by schedule against a piping class.
Precision Hydraulic Components
Precision seamless tube for cylinder barrels and machined parts where bore and wall condition matter more than length.
Heavy Wall Structural Members
Seamless square and rectangle sections used on booms masts and lifting structures that need a heavier wall than welded tube offers.
Buying Guide
What To State When You Order
State outside diameter in inches or millimetres and say which one governs since the range starts at 21.3mm and 1/2 inch
Give wall as a schedule such as SCH40 SCH80 or XS or as a millimetre figure inside the 1.65mm to 80mm range
Name grade and standard together for example A106 GR.B or A333 GR6 so the chemistry and the test scope are both fixed
Say whether the surface is bare or galvanized before the pipe is finished rather than after it is rolled
Confirm the section shape because round square and rectangle seamless are separate production runs
Give cut length end finish and bundle packing for the destination port so the pipe arrives ready to weld
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Seamless Steel Pipe FAQ
What is the difference between seamless pipe and welded pipe?
Seamless pipe is a long pipe of steel with a hollow section and no joint around it. Welded pipe is formed and joined along a seam. Where a specification refuses a longitudinal weld or the wall is heavy the seamless product is the one to order.
Which grades do you quote for seamless pipe?
A53 Gr. A and Gr. B A106 GR.A and GR.B A333 GR1 GR3 GR6 and S355JR S355JO 355J2 are the usual list. A36 the JIS grades SS330 SS440 SS490 SPHD SPHE and the EN BS grades S185 through S355J2H are also quoted.
How do I specify wall thickness?
By schedule. SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS are available which covers 1.65mm to 80mm and a customized wall can be discussed.
Do you make seamless pipe in square and rectangle sections?
Yes. Seamless square pipe and seamless rectangle pipe are part of this range and galvanized versions of both are supplied.
What do you supply for drilling work?
Drill pipe to API SPEC 5DP and API SPEC7 in G105 or S135 with Nc38 and Nc50 connections and separate casing pipe for the well itself.
Can the pipe be galvanized before it ships?
Yes. Galvanized seamless steel pipe galvanized seamless square pipe and galvanized seamless rectangle pipe all leave the works with the surface already coated.
Get a Quotation on Seamless Steel Pipe
Tell us state outside diameter in inches or millimetres and say which one governs since the range starts at 21.3mm and 1/2 inch and we will come back with price, availability and what the mill test certificate will show for seamless steel pipe.