Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Galvanized Steel Pipe, Seamless Steel Pipe
Galvanized Seamless Rectangular Steel Pipe in A106 and A333 Grades
Jointless hollow section with a zinc coated surface in schedule wall thicknesses
Galvanized seamless rectangular steel pipe is a long pipe of steel with a hollow section and no joint around it, finished with a galvanized surface. Piping and pressure equipment engineers call for it where the seam of a welded tube is the weak point, and it is offered in A53 Gr A and Gr B, A106 Gr A and Gr B, the low temperature A333 Gr 1 Gr 3 and Gr 6 grades, and S355JR S355JO and S355J2. Specifying wall by schedule instead of by a raw millimeter figure means the pipe matches the fittings and flanges already on the drawing, which stops the mismatch that appears at assembly when a wall is ordered by thickness alone. Wall thickness runs from 1.65mm to 80mm across SCH5S through SCH160, STD and XS.
- Product Name — Galvanized Seamless Rectangle Steel Pipe
- Description — Long pipe of steel with hollow section and no joint around it with a galvanized surface
- Material — A53 Gr A Gr B A106 Gr A Gr B A333 Gr 1 Gr 3 Gr 6 S355JR S355JO S355J2
- Outside Diameter — 1/2 inch to 48 inch or customized
- Thickness Schedules — SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS
Why It Is Specified
Key Benefits of Galvanized Seamless Rectangle Steel Pipe
No Joint Around The Section
The pipe is formed with a hollow section and no joint around it, so there is no longitudinal weld to become the limiting feature under internal pressure or cyclic load.
Wall Called By Schedule Not By Guesswork
SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160 and XS are all available, so the ordered wall lines up with the fittings on the isometric.
Low Temperature Grades On The Same List
A333 Gr 1, Gr 3 and Gr 6 sit alongside the ambient temperature A53 and A106 grades, so a cold service line item does not need a separate supplier.
Galvanized Surface On A Seamless Body
The zinc coating handles external corrosion in buried damp or coastal installations while the jointless wall handles the internal duty.
Fixed And Random Lengths To Suit The Run
5.8m and 6m fixed, 12m fixed or 2-12m random lengths let you match the spool drawing rather than cutting standard bars down and scrapping the remainder.
Wall Range From Thin Wall To Eighty Millimeters
Thickness spans 1.65mm to 80mm, which covers a light instrument line and a heavy pressure section from one supply route.
Problems It Solves
What This Material Removes From Your Process
Seam Limiting The Allowable Pressure
A welded section is rated around its seam. A pipe with no joint around it removes that limiting feature and lets the rating follow the parent material.
Wall Ordered In Millimeters That Does Not Match The Fittings
Fittings and flanges are cataloged by schedule. Ordering the pipe by SCH40 or SCH80 keeps the bore and the wall consistent with everything else on the isometric.
External Corrosion On Buried Or Damp Runs
Bare seamless pipe in a trench corrodes from the outside long before the wall is consumed from within. The galvanized surface addresses the side of the wall the process fluid never touches.
Splitting An Order Between Cold And Ambient Service
A333 low temperature grades and A53 or A106 ambient grades come from the same range, so one purchase order covers both parts of the system.
Offcuts Left By Fixed Length Supply
Random 2-12m lengths let a spool shop nest its cuts instead of trimming every piece from a fixed 6m bar.
Application Scenarios
Where It Is Used
Pressure Piping In Process Plants
A106 Gr B sections carrying steam and hot fluids where a welded seam would limit the allowable pressure.
Low Temperature And Refrigeration Circuits
A333 Gr 3 and Gr 6 lines for cold service where impact toughness at low temperature governs the grade choice.
Buried And Damp Service Runs
Galvanized sections installed in trenches pits and plant basements where external corrosion drives the maintenance cost.
Structural Members Carrying Internal Pressure
S355JR S355JO and S355J2 sections used where a member is both a structural element and a pressurized conduit.
Marine And Coastal Equipment Frames
Coated seamless sections on deck equipment and shore installations exposed to salt laden air.
Heavy Wall Sleeves And Casings
Sections in the upper part of the 1.65mm to 80mm wall range used as casings sleeves and protection around service lines.
Who It Is For
Buyers Who Specify This Product
- Piping engineers specifying A106 Gr B sections by schedule for pressure service
- Cold service and refrigeration contractors buying A333 Gr 6 material for low temperature lines
- Plant maintenance buyers replacing corroded buried sections with a galvanized equivalent
- Spool fabricators ordering 5.8m 6m or 12m fixed lengths to match the isometric
- Structural fabricators specifying S355J2 sections that carry both load and internal pressure
- Distributors stocking schedule wall seamless section across SCH5S to SCH160
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.
| Product Name | Galvanized Seamless Rectangle Steel Pipe |
|---|---|
| Description | Long pipe of steel with hollow section and no joint around it with a galvanized surface |
| Material | A53 Gr A Gr B A106 Gr A Gr B A333 Gr 1 Gr 3 Gr 6 S355JR S355JO S355J2 |
| Outside Diameter | 1/2 inch to 48 inch or customized |
| Thickness Schedules | SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 XS |
| Wall Thickness | 1.65mm to 80mm or customized |
| Length | 5.8m 6m fixed 12m fixed 2-12m random or customized |
| Technique | Seamless |
| Surface | Galvanized |
| Certification | ISO9001 BV SGS RoHS |
| Place of Origin | China |
Technical Features
- Seamless body with a hollow section and no joint around it
- Galvanized outer surface
- Material A53 Gr A and Gr B
- Material A106 Gr A and Gr B
- Low temperature material A333 Gr 1 Gr 3 and Gr 6
- Structural material S355JR S355JO and S355J2
- Wall by schedule SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS covering 1.65mm to 80mm
- Lengths 5.8m 6m fixed 12m fixed or 2-12m random or customized
Materials
- Carbon steel A53 Gr A and Gr B
- Seamless pressure grade A106 Gr A and Gr B
- Low temperature carbon steel A333 Gr 1 Gr 3 and Gr 6
- Structural steel S355JR S355JO and S355J2
- Zinc coating applied to the outer surface
Certification
- ISO9001
- BV
- SGS
- RoHS
- Mill test certificate supplied with the shipment
Manufacturing
How It Is Made and Processed
Billet heating and piercing to form a hollow section with no joint
Rolling and elongation to the ordered wall
Forming to the rectangular profile
Sizing to the ordered outside dimensions and schedule wall
Galvanizing of the outer surface
Cutting to 5.8m 6m 12m fixed or 2-12m random lengths
Dimensional inspection
Bundling marking and packing for export
Quality Control
Checks Before It Ships
- Material grade confirmed against A53 A106 A333 or S355 as ordered
- Wall thickness checked against the nominated schedule
- Outside dimensions verified before galvanizing
- Coating appearance and coverage inspected on all faces
- Cut lengths measured against the ordered fixed or random range
- Mill test certificate raised for the shipment
Customization
What We Can Change on Your Order
- Outside dimensions customized beyond the published 1/2 inch to 48 inch range
- Wall selected by schedule from SCH5S to SCH160 or given directly in millimeters
- Grade chosen per line item across A53 A106 A333 and S355
- Fixed 5.8m 6m or 12m lengths or 2-12m random cut to suit the spool drawing
- Customized lengths cut against your piping isometric
- Bundle and marking format set to match your receiving process
Comparison
Galvanized Seamless Rectangle Steel Pipe Against the Alternatives
| Welded rectangular hollow section | No joint runs around the seamless section, so there is no weld line to govern the pressure rating or to inspect over the life of the line. |
|---|---|
| Bare seamless pipe | The galvanized surface handles the external corrosion that normally ends the service life of buried and damp run sections. |
| Pipe ordered by millimeter wall only | Schedule wall from SCH5S to SCH160 keeps the pipe consistent with catalog fittings and flanges rather than forcing a machined transition. |
| Ambient grade carbon pipe in cold service | A333 Gr 1 Gr 3 and Gr 6 are specified for low temperature duty and sit on the same supply list as the ambient grades. |
Use Guide
Specifying Handling and Welding Notes
- Order the wall by schedule so the pipe matches the fittings already selected on the isometric
- Choose A333 Gr 3 or Gr 6 when the design temperature falls into low temperature service rather than derating an ambient grade
- Remove the zinc back from the joint area before welding and restore the coating over the finished weld
- Use the 2-12m random option when the spool shop can nest cuts and the fixed option when the run length is known
- Support long runs at intervals suited to the wall thickness rather than to the outside dimension alone
- Ask for the mill test certificate with the shipment so the grade and wall are documented for the pressure file
Questions Buyers Ask
Galvanized Seamless Rectangle Steel Pipe FAQ
What wall thicknesses can you supply?
From 1.65mm to 80mm, called out as SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160 or XS. Customized walls are also quoted.
Do you stock low temperature grades?
A333 Gr 1, Gr 3 and Gr 6 are all on the material list, alongside A53 and A106 for ambient and higher temperature service.
What lengths are standard?
5.8m and 6m fixed, 12m fixed, or 2-12m random. Customized lengths are cut against your drawing.
Why choose seamless rather than welded for this shape?
The seamless section has a hollow section with no joint around it, so there is no weld line to inspect or to limit the rating of the component.
Does the galvanizing affect the wall thickness?
The wall is produced to the ordered schedule before coating. State the schedule and the grade and the certificate will record what was made.
Can you go larger than 48 inch?
The published range runs to 48 inch, and sizes outside it are quoted as customized. Send the outside dimensions and wall you need.
What certification is held for this product?
ISO9001, BV, SGS and RoHS. A mill test certificate is issued with the material on request.
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