Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Welded Pipe, Steel Pipe
ERW Welded Steel Pipe in Carbon and Line Pipe Grades
Electric resistance welded pipe from one strip source with a full mechanical test record
ERW welded steel pipe is electric resistance welded pipe formed from strip and joined along a longitudinal seam without filler metal. It is bought by fabricators, plant maintenance departments and stockholders for low pressure transport of water, gas and oil as well as oil drilling and machinery manufacturing work. Because the wall comes from rolled strip rather than a pierced billet, the wall stays consistent along the length, which is what keeps a cut and weld fabrication from needing rework at the joint. Each order is released with an EN 10204/3.1Ba certificate covering chemistry, mechanical results and the technical tests.
- Product Name — ERW Welded Steel Pipe
- Manufacturing Method — Electric resistance welded
- Standards — ASTM 53, EN10217, DIN 2458, IS 3589, JIS G3452, BS1387
- ASTM Grades — ASTM A53 GR A, GR B
- EN Grades — S275, S275JR, S355JRH, S355J2H
Why It Is Specified
Key Benefits of ERW Welded Steel Pipe
Consistent Wall Along the Length
The pipe is formed from strip, so the wall does not vary the way a pierced body can. Fit up at flanges and fittings is more predictable on a fabricated assembly.
One Size Band for Most Plant Pipework
Outside diameter from 21.3mm to 660.4mm and wall from 1.5 to 22.2mm covers instrument runs through to main headers on the same purchase order.
Grades Named in Three Code Families
ASTM A53 GR A and GR B, EN S275 to S355J2H and GB Q195 to Q345 are all available, so drawings from different design offices can be filled from one supply.
Surface Finish Fixed at Order
Fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen or black oil coating is applied as the customer requires instead of being handled after delivery.
Technical Tests Reported Not Assumed
Flattening, bending, blow and impact tests sit alongside tensile, yield and elongation results and the hydrostatic test on the certificate.
Short and Long Pieces from One Order
Lengths from 0.3 to 18 M mean fabrication offcuts and long straight runs can both be ordered as finished pieces.
Problems It Solves
What This Material Removes From Your Process
Wall Variation Showing Up at Fit Up
Uneven wall makes weld preparation inconsistent across a batch. Pipe formed from strip holds its wall so the same weld procedure works down the run.
Two Suppliers for Small and Large Bore
Splitting an order between a small bore stockist and a large bore mill doubles the paperwork. The 21.3mm to 660.4mm band comes from one source.
Grade Called Out in an Unfamiliar Code
A drawing quoting S355J2H when the yard stocks Q345 stalls approval. Both grade families are quoted so the equivalence is on the order.
Coating Work Added After Delivery
Painting or wrapping after arrival adds labor and delays installation. The surface treatment is applied to your requirement before shipment.
Test Evidence Missing at Handover
Clients asking for mechanical and hydrostatic results after installation create a document chase. The EN 10204/3.1Ba certificate arrives with the pipe.
Application Scenarios
Where It Is Used
Low Pressure Water and Gas Runs
Site and plant pipework moving water or gas at low pressure where a welded body in Q235 or A53 GR B is adequate.
Oil Transfer Pipework
Short transfer lines carrying oil between tanks and pumps within a plant boundary.
Oil Drilling Site Service Lines
Utility and service runs on drilling sites where pipe is installed quickly and replaced as the site moves.
Machinery Manufacturing Parts
Sleeves, rollers, spacers, frames and housings cut from welded tube in Q345 or S355J2H.
Structural Posts and Supports
Pipe supports, columns and guard frames built in S275JR and S355JRH where the section is a round tube.
Stock Range for Distributors
Size coverage across the full 21.3mm to 660.4mm band held for local resale in common carbon grades.
Who It Is For
Buyers Who Specify This Product
- Fabrication shops buying round tube for machinery frames sleeves and housings
- Plant maintenance buyers replacing low pressure water gas and oil lines
- Contractors ordering pipe in ASTM A53 GR B for general site pipework
- Design offices needing EN S275 and S355 round sections for structural detailing
- Drilling site procurement staff sourcing service pipe for temporary installations
- Stockholders covering common carbon grades across the whole diameter band
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 | ERW Welded Steel Pipe |
|---|---|
| Manufacturing Method | Electric resistance welded |
| Standards | ASTM 53, EN10217, DIN 2458, IS 3589, JIS G3452, BS1387 |
| ASTM Grades | ASTM A53 GR A, GR B |
| EN Grades | S275, S275JR, S355JRH, S355J2H |
| GB Grades | Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360 to L555 |
| Outside Diameter | 21.3mm to 660.4mm |
| Wall Thickness | 1.5 to 22.2mm |
| Length | 0.3 to 18 M |
| Surface Treatment | Fusion bond epoxy coating, coal tar epoxy, 3PE, vanish coating, bitumen coating, black oil coating as per customer requirement |
| Certificate | EN 10204/3.1Ba |
| Tests | Chemical component analysis, tensile, yield, elongation, flattening, bending, blow, impact, exterior size inspection, hydrostatic |
| Place of Origin | China |
Technical Features
- Electric resistance welded longitudinal seam with no filler metal
- Outside diameter 21.3mm to 660.4mm
- Wall thickness 1.5 to 22.2mm
- Length 0.3 to 18 M
- Standards ASTM 53, EN10217, DIN 2458, IS 3589, JIS G3452 and BS1387
- Grades ASTM A53 GR A and GR B, EN S275, S275JR, S355JRH and S355J2H
- GB grades Q195, Q215, Q235, Q345 and L175 to L555
- Certificate EN 10204/3.1Ba
Materials
- Carbon steel strip in ASTM A53 GR A and GR B
- EN structural grades S275, S275JR, S355JRH and S355J2H
- GB grades Q195, Q215, Q235 and Q345
- Line pipe grades L175, L210, L245, L320 and L360 to L555
Certification
- ISO9001
- BV
- SGS
- RoHS
- EN 10204/3.1Ba certificate issued with the shipment
Manufacturing
How It Is Made and Processed
Strip decoiling to the width for the ordered diameter
Roll forming of the strip into a round section
Electric resistance welding of the longitudinal seam
Seam trimming and sizing to the ordered diameter
Straightening and end cutting
Hydrostatic testing and exterior size inspection
Surface treatment where a coating is ordered
Bundling, marking and loading for export
Quality Control
Checks Before It Ships
- Chemical component analysis against the ordered grade
- Ultimate tensile strength, yield strength and elongation testing
- Flattening, bending, blow and impact testing of the welded body
- Hydrostatic test on the finished pipe
- Exterior size inspection of diameter, wall thickness and length
- EN 10204/3.1Ba certificate issued with the order
Customization
What We Can Change on Your Order
- Diameter selected anywhere between 21.3mm and 660.4mm
- Wall thickness from 1.5 to 22.2mm to suit the service
- Cut lengths from 0.3 to 18 M against your cutting list
- Grade chosen from the ASTM, EN or GB lists on the order
- Coating applied from the surface treatment list where required
- Bundle size and marking set for the destination port
Comparison
ERW Welded Steel Pipe Against the Alternatives
| Seamless steel pipe | ERW pipe is formed from strip so the wall is uniform along the length, and it is normally the faster route to volume in one diameter. |
|---|---|
| Spiral welded pipe | The longitudinal seam suits the smaller band up to 660.4mm, while spiral bodies take over on the larger diameters. |
| Galvanized welded pipe | ERW pipe is supplied black or with a chosen coating, so you are not paying for a zinc layer on lines that run indoors. |
| Square or rectangular hollow section | A round body distributes internal pressure evenly and mates with pipe fittings and flanges without an adaptor. |
Use Guide
Specifying Handling and Welding Notes
- State the design pressure so the wall can be chosen from the 1.5 to 22.2mm band rather than by habit
- Quote both the code grade and the equivalent you normally stock so the substitution is agreed before rolling
- Order cut lengths from 0.3 to 18 M where the fabrication drawing is already fixed
- Keep weld procedures matched to the grade supplied since S355J2H and Q235 behave differently at the joint
- Store pipe off the ground on timber so the ends stay round and the surface stays clean
- Ask for the mill test certificate to EN 10204/3.1Ba when you place the order
Questions Buyers Ask
ERW Welded Steel Pipe FAQ
What does ERW mean on a pipe specification?
ERW is electric resistance welded pipe. Strip is formed round and the edges are joined by resistance welding, which gives a longitudinal seam along the length.
What sizes are available?
Outside diameter from 21.3mm to 660.4mm, wall thickness from 1.5 to 22.2mm and length from 0.3 to 18 M.
What pressure service is ERW pipe suited to?
It is used for low pressure liquid transportation such as water, gas and oil, along with oil drilling and machinery manufacturing. Send the operating pressure and we will confirm grade and wall.
Can I get Q345 instead of S355J2H?
Both are on the grade list. Tell us which one the drawing calls for and which your inspector will accept, and the certificate will show what was supplied.
Do you cut pipe to length before shipping?
Yes. Lengths from 0.3 to 18 M are cut to your list so fewer cuts are needed in the workshop.
What tests are included as standard?
Chemical component analysis, tensile, yield and elongation, flattening, bending, blow and impact tests, exterior size inspection and a hydrostatic test.
Can a sample length be sent before a full order?
Samples are available. Give the diameter, wall, grade and length you want to check and we will confirm what can be released.
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