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 Steel Pipe in A53 A106 and A333 Grades
Galvanized seamless pipe in A53 A106 A333 and S355 grades to fixed or random lengths
Galvanized seamless steel pipe is a hollow section pipe rolled without a longitudinal joint and then galvanized on the outside surface. It is specified by pipeline contractors, fire and water main installers and structural fabricators who want the pressure behavior of a seamless body together with a coated surface. Ordering the pipe already galvanized removes the separate coating step that normally sits between mill delivery and site installation and delays the fabrication program. Material coverage runs from A53 Gr. A and Gr. B through A106 GR.A and GR.B, the low temperature A333 GR1 GR3 GR6 range and the S355JR S355JO and S355J2 structural grades.
- Product Name — Galvanized Seamless Steel Pipe
- Also Known As — GI seamless pipe galvanized seamless tube
- Section Shape — Round hollow section
- Manufacturing Method — Seamless
- Material — A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6, S355JR, S355JO, S355J2
Why It Is Specified
Key Benefits of Galvanized Seamless Steel Pipe
No Weld Seam To Design Around
The pipe is formed as a continuous hollow section with no joint around it, so wall behavior is uniform around the circumference and the designer does not have to allow for a seam orientation.
Coated Before It Reaches Your Site
The surface is galvanized at the supply stage. That removes the separate dipping or painting operation that fabricators otherwise schedule between receiving plain pipe and installing it.
Full Schedule Range From One Order
Wall thickness runs from SCH5S through SCH160 and XS, covering 1.65mm to 80mm, so thin wall structural runs and heavy pressure runs can sit on the same purchase order.
Low Temperature Grades Available
A333 GR1 GR3 and GR6 are stocked alongside the standard A53 and A106 grades for lines that have to stay ductile in cold service.
Length Cut To Suit The Installation
Fixed 5.8m, 6m and 12m lengths or 2-12m random lengths are available, so you can match container loading or site handling limits without cutting on arrival.
Documented Supply
ISO9001, BV, SGS and RoHS certification is stated for this line, which gives your quality department something to file against the incoming inspection record.
Problems It Solves
What This Material Removes From Your Process
Coating Step Adding Time After Delivery
Buying plain pipe means a second trip to a galvanizer before installation. Supplying the pipe with the surface already galvanized takes that handling loop out of the schedule.
Seam Failures in Pressure Service
Welded tube puts a longitudinal joint in the pressure boundary. A seamless body has no joint around it, so there is no seam to inspect, qualify or explain to the client.
Mixing Suppliers For Different Schedules
Projects usually need several wall thicknesses at once. A range from SCH5S to SCH160 and XS from one source means one purchase order, one document set and one shipment.
Length Mismatch On Arrival
Pipe delivered in the wrong length gets cut on site and wasted. Fixed 5.8m 6m and 12m lengths or 2-12m random lengths are set before shipment against your handling limits.
Cold Service Grade Sourcing
A333 GR1 GR3 and GR6 are often quoted on long lead time by general pipe traders. Carrying them alongside the A53 and A106 range keeps a cold service line from stalling the package.
Application Scenarios
Where It Is Used
Fire Main and Sprinkler Risers
Galvanized pipe runs for wet risers and sprinkler loops in buildings where an uncoated carbon steel line would rust internally between tests.
Water Transmission and Pump Station Pipework
Pump headers, suction and discharge legs where A53 Gr. B in a heavier schedule carries the pressure and the galvanized surface handles the wet environment.
Low Temperature Process Lines
Cold service piping in A333 GR1 GR3 or GR6 where the material has to stay tough at low operating temperature.
Structural Columns and Support Frames
S355JR S355JO and S355J2 pipe used as columns, bracing and equipment support frames in exposed outdoor structures.
Oil and Gas Utility Piping
Non critical utility and instrument air runs on production sites where a coated seamless pipe outlasts a plain welded tube.
Marine and Coastal Installations
Handrails, deck service lines and jetty pipework where salt spray attacks unprotected carbon steel quickly.
Who It Is For
Buyers Who Specify This Product
- Mechanical contractors buying galvanized risers and headers for fire protection and plumbing packages
- Pipeline and utility contractors buying seamless line pipe for water and process transmission runs
- Structural fabricators buying S355 grade pipe sections for exposed frames and bracing
- Refinery and process plant purchasing engineers buying A333 low temperature pipe for cold service lines
- Pipe stockists and distributors carrying a schedule range from SCH5S to SCH160
- Shipyard and marine workshop buyers sourcing coated pipe for deck and jetty service
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 Steel Pipe |
|---|---|
| Also Known As | GI seamless pipe galvanized seamless tube |
| Section Shape | Round hollow section |
| Manufacturing Method | Seamless |
| Material | A53 Gr. A, Gr. B, A106 GR.A, GR.B, A333 GR1, GR3, GR6, S355JR, S355JO, S355J2 |
| Outside Diameter | 1/2 inch to 48 inch starting at 21.3mm or customized |
| Wall Thickness | SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160, XS covering 1.65mm to 80mm or customized |
| Length | 5.8m and 6m fixed, 12m fixed, 2-12m random or customized |
| Surface | Galvanized |
| Place of Origin | China |
| Certificate | ISO9001, BV, SGS, RoHS |
Technical Features
- Seamless hollow section with no joint around the circumference
- Galvanized outside surface
- ASTM material range A53 Gr. A and Gr. B and A106 GR.A and GR.B
- Low temperature material range A333 GR1 GR3 and GR6
- Structural material range S355JR S355JO and S355J2
- Outside diameter 1/2 inch to 48 inch starting at 21.3mm or customized
- Wall thickness SCH5S SCH10S SCH20S SCH20 SCH30 STD SCH40 SCH60 SCH80 SCH100 SCH140 SCH160 and XS covering 1.65mm to 80mm
- Length 5.8m or 6m fixed, 12m fixed, 2-12m random or customized
Materials
- ASTM A53 Gr. A and Gr. B carbon steel pipe material
- ASTM A106 GR.A and GR.B seamless pressure pipe material
- ASTM A333 GR1 GR3 and GR6 low temperature service material
- S355JR S355JO and S355J2 structural steel material
- Zinc coating applied to the pipe surface
Certification
- ISO9001
- BV
- SGS
- RoHS
Manufacturing
How It Is Made and Processed
Seamless pipe forming to the ordered outside diameter
Wall thickness rolled to the ordered schedule from SCH5S to SCH160
Cutting to 5.8m 6m 12m fixed or 2-12m random length
Surface cleaning ahead of coating
Galvanizing of the pipe surface
Grade and size marking
Bundling and packing for export loading
Quality Control
Checks Before It Ships
- Grade confirmed against the ordered A53 A106 A333 or S355 designation
- Outside diameter checked against the ordered size
- Wall thickness checked against the ordered schedule
- Galvanized surface inspected for coverage and handling damage
- Cut length verified before bundling
- Bundle marking and packing checked before loading
Customization
What We Can Change on Your Order
- Outside diameter outside the 1/2 inch to 48 inch standard listing on request
- Wall thickness outside the listed schedule range on request
- Cut length set to 5.8m 6m 12m or to your own fixed dimension
- Grade selected across the A53 A106 A333 and S355 range per line
- Mixed size and grade loading in one shipment against your bill of materials
Comparison
Galvanized Seamless Steel Pipe Against the Alternatives
| Welded ERW pipe | The seamless body has no joint around it, so there is no longitudinal weld in the pressure boundary to inspect or qualify. |
|---|---|
| Plain black seamless pipe | The surface arrives galvanized, which removes the separate coating operation between delivery and installation. |
| Painted carbon steel pipe | A zinc coating stays intact through handling and cutting far better than a paint film that chips at every sling point. |
| Stainless steel pipe | Galvanized carbon steel covers wet and outdoor service at carbon steel material cost where full stainless corrosion resistance is not required. |
Use Guide
Specifying Handling and Welding Notes
- State the grade and the schedule together because the same outside diameter is supplied across SCH5S to SCH160
- Confirm whether the line needs fixed 5.8m 6m or 12m lengths or 2-12m random before the cutting list is released
- Grind and recoat any cut end or weld zone because galvanizing is removed locally by cutting and welding heat
- Use A333 GR1 GR3 or GR6 rather than A53 where the service temperature drops and toughness matters
- Ventilate when welding galvanized pipe and follow the procedure for zinc coated steel
- Store bundles clear of standing water so white rust does not form on the coating in transit or in the yard
Questions Buyers Ask
Galvanized Seamless Steel Pipe FAQ
What outside diameters can you supply in galvanized seamless pipe?
Outside diameter runs from 1/2 inch to 48 inch and starts at 21.3mm. Sizes outside that listing are made to order.
Which wall thicknesses are available?
SCH5S, SCH10S, SCH20S, SCH20, SCH30, STD, SCH40, SCH60, SCH80, SCH100, SCH140, SCH160 and XS are covered, spanning 1.65mm to 80mm. Give us the schedule and the outside diameter together so the right wall is quoted.
Can you supply A333 low temperature grades galvanized?
A333 GR1, GR3 and GR6 are part of the material range for this line. Tell us the service temperature you are designing for and we will confirm the grade before the order is fixed.
What lengths do you cut to?
Fixed 5.8m, 6m and 12m are standard and 2-12m random is available. Fixed lengths are set against your container or site handling limit.
What certification comes with the pipe?
ISO9001, BV, SGS and RoHS certification is stated for this line. Ask for the mill test certificate with the order so the grade is documented for your incoming inspection file.
Do we have to recoat the pipe after cutting?
Yes. Cutting and welding burn the zinc off locally, so cut ends and heat affected zones should be cleaned and recoated before the line goes into service.
Can different grades and diameters ship together?
Yes. Mixed grade and mixed size loading against one bill of materials is normal for project supply and keeps the shipment and the document set together.
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