Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Welded Pipe, Steel Pipe
LSAW Longitudinal Submerged Arc Welded Steel Pipe
Plate formed submerged arc welded pipe with a single straight seam for large bore duty
LSAW steel pipe is produced by forming steel plate into a cylinder and closing it with a longitudinal submerged arc weld run from both the inside and the outside. Civil contractors, piling crews, water utilities and process plant buyers reach for it when the bore required is larger than a strip mill can roll and when a single straight seam is easier to inspect than a helical one. Because the weld is X-ray examined and every pipe is hydrostatically tested, the inspection record that normally holds up acceptance arrives with the material. Pipe is made from 355.6mm to 1820mm outside diameter in walls of 5.0 to 50mm.
- Product Name — LSAW Welded Steel Pipe
- Also Known As — Longitudinal submerged arc welded steel pipe
- Standards — ASTM 53 EN10217 DIN 2458 IS 3589 GB/T3091 GB/T9711
- ASTM Material — A53 GR A GR B GR C
- EN Material — S275 S275JR S355JRH S355J2H
Why It Is Specified
Key Benefits of LSAW Welded Steel Pipe
One Straight Seam Instead of a Helical One
A single longitudinal weld is quicker to locate, X-ray and repair in the field than a spiral seam that runs the whole length of the pipe.
Plate Sourced Grades Across Four Families
ASTM A53 GR A GR B GR C, EN S275 to S355J2H, Chinese Q195 to Q345 and the L175 to L555 series all come off the same forming line.
Heavy Wall Available at Large Bore
Wall thickness reaches 50mm at diameters up to 1820mm, which suits piling casing, abrasive service and anything where the pipe carries external load.
Full Test Package on Every Order
Chemistry, tensile, yield and elongation, flattening, bending, blow and impact tests, exterior size inspection, hydrostatic test and X-ray test are all performed and reported.
Coating Systems for Buried and Exposed Runs
Fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen and black oil coatings are applied to the customer requirement rather than to a fixed default.
Length Set to the Site Not the Mill
Pipe is cut between 3 and 12.5m so the delivered length matches the crane, the trench box and the road access on the job.
Problems It Solves
What This Material Removes From Your Process
Bore Larger Than Strip Based Pipe Can Reach
Welded pipe rolled from strip runs out of size well before 1820mm. Forming from plate keeps one supplier across the whole diameter range up to that figure.
Spiral Seams Slowing Down Field Inspection
A helical weld has to be tracked the length of the pipe during examination. A single straight seam shortens the inspection and simplifies any repair.
Test Records Compiled After Delivery
The test package covering chemistry, mechanical properties, hydrostatic test and X-ray is produced with the pipe and issued on an EN 10204/3.1B certificate.
Coating Damaged in Double Handling
Pipe sent out bare and returned coated is handled twice. Coating applied before shipment reduces the lifts between the mill and the trench.
Wall Rounded Up Because Nothing Else Is Stocked
With wall available continuously from 5.0 to 50mm the section can be set by calculation instead of by what happens to be on the rack.
Application Scenarios
Where It Is Used
Low Pressure Liquid Delivery
Water, gas and oil delivery lines where the pipe operates at low pressure and diameter rather than pressure class drives the design.
Bored and Driven Pile Casing
Large diameter casing sections in heavy wall carrying driving stress and ground load instead of internal pressure.
Bridge and Marine Structure Piles
Tubular piles and cofferdam sections protected with an external coating before they go into the water or the ground.
Process Plant Headers and Bulk Lines
Large bore headers, cooling water mains and intake lines inside power and process plants.
Culverts Sleeves and Crossings
Coated large diameter pipe used as a road or rail crossing sleeve carrying a smaller carrier pipe.
Storage Tank and Vessel Shell Sections
Rolled and welded cylindrical sections where a documented weld and hydrostatic record is required.
Who It Is For
Buyers Who Specify This Product
- Civil contractors buying large diameter casing and sleeve sections for crossings and piles
- Water utility engineers buying bulk mains and intake pipe in coated condition
- Power and process plant buyers ordering large bore cooling water and header pipe
- Piling subcontractors buying heavy wall tubular sections by the meter
- Inspection and QA managers who need the X-ray and hydrostatic record with the delivery
- Steel traders buying large bore welded pipe for regional infrastructure projects
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 | LSAW Welded Steel Pipe |
|---|---|
| Also Known As | Longitudinal submerged arc welded steel pipe |
| Standards | ASTM 53 EN10217 DIN 2458 IS 3589 GB/T3091 GB/T9711 |
| ASTM Material | A53 GR A GR B GR C |
| EN Material | S275 S275JR S355JRH S355J2H |
| GB Material | Q195 Q215 Q235 Q345 L175 L210 L245 L320 L360-L555 |
| Out Diameter | 355.6mm - 1820mm |
| Wall Thickness | 5.0 - 50mm |
| Length | 3 - 12.5m |
| Surface Treatment | Fusion bond epoxy coating coal tar epoxy 3PE vanish coating bitumen coating black oil coating as per customer requirement |
| Certificate | EN 10204/3.1B |
| Test | Chemical component analysis mechanical properties technical properties exterior size inspection hydrostatic test X-ray test |
| Place of Origin | China |
| Certification | API 5L ISO9001 BV SGS RoHS |
Technical Features
- Standards ASTM 53 EN10217 DIN 2458 IS 3589 GB/T3091 and GB/T9711
- API 5L certification stated for the product
- Outside diameter 355.6mm to 1820mm
- Wall thickness 5.0 to 50mm
- Length 3 to 12.5m
- Grades A53 GR A GR B GR C S275 S275JR S355JRH S355J2H Q195 Q215 Q235 Q345
- Line pipe series L175 L210 L245 L320 and L360 to L555
- Surface fusion bond epoxy coal tar epoxy 3PE vanish bitumen or black oil coating
Materials
- Hot rolled carbon steel plate as the forming stock
- ASTM A53 GR A GR B and GR C carbon steel
- EN structural grades S275 S275JR S355JRH and S355J2H
- GB grades Q195 Q215 Q235 Q345 and the L175 to L555 series
- Submerged arc welding wire and flux for the longitudinal seam
Certification
- API 5L
- ISO9001
- BV
- SGS
- RoHS
- EN 10204/3.1B mill certificate
Manufacturing
How It Is Made and Processed
Plate cutting and edge milling to the developed width
Crimping of the plate edges
Forming the plate into a cylinder
Tack welding followed by internal and external submerged arc welding
X-ray examination of the longitudinal seam
Expansion sizing and end facing
Hydrostatic testing of each pipe
Coating marking and loading for export
Quality Control
Checks Before It Ships
- Chemical component analysis on the plate and finished pipe
- Ultimate tensile strength yield strength and elongation testing
- Flattening bending blow and impact testing
- X-ray test of the longitudinal weld
- Hydrostatic test on each finished length
- Exterior size inspection against the ordered diameter wall and length
Customization
What We Can Change on Your Order
- Diameter produced anywhere between 355.6mm and 1820mm
- Wall thickness set between 5.0 and 50mm for the load or pressure case
- Length cut between 3 and 12.5m for your handling equipment
- Coating selected from fusion bond epoxy coal tar epoxy 3PE vanish bitumen or black oil
- Bevelled or plain ends prepared for your field joint method
- Grade chosen from the ASTM EN or GB families named in your specification
Comparison
LSAW Welded Steel Pipe Against the Alternatives
| SSAW spiral welded pipe | One straight seam replaces a helical weld running the full length, which shortens X-ray inspection and makes any weld repair easier to reach. |
|---|---|
| ERW pipe rolled from strip | Forming from plate takes the diameter to 1820mm and the wall to 50mm, sizes that strip based welded pipe does not reach. |
| Seamless pipe | At large bore LSAW gives comparable dimensions with a documented X-ray and hydrostatic record on each length and without seamless pricing. |
| Concrete pipe for bulk water | Steel pipe is welded into a continuous line and handles ground movement better than a jointed rigid pipe, and it can be recoated rather than replaced. |
Use Guide
Specifying Handling and Welding Notes
- Decide the end preparation before production so pipe arrives bevelled for the field welding procedure you use
- Keep the longitudinal seam out of the invert on buried water lines where the specification allows
- Pick 3PE or fusion bond epoxy for buried service and bitumen or black oil for temporary above ground runs
- Support coated pipe on padded bolsters so the coating is not cut at the stack points
- Check the X-ray and hydrostatic test records against the pipe numbers at receipt rather than at installation
- Name the standard from ASTM 53 EN10217 DIN 2458 IS 3589 GB/T3091 or GB/T9711 that the order must follow
Questions Buyers Ask
LSAW Welded Steel Pipe FAQ
How is LSAW pipe made?
Steel plate is cut, crimped and formed into a cylinder, then closed with a submerged arc weld run on the inside and the outside. The pipe is then expanded, X-ray examined and hydrostatically tested.
What sizes are available?
Outside diameter from 355.6mm to 1820mm, wall thickness from 5.0 to 50mm and length from 3 to 12.5m.
Is LSAW suitable for pressure service?
The source specification covers low pressure liquid delivery such as water, gas and oil. Send your design pressure and medium and we will confirm the grade and wall for that duty.
Which non destructive testing is included?
X-ray testing of the longitudinal weld and a hydrostatic test on each length, along with exterior size inspection and the mechanical test package.
Can you supply the pipe with bevelled ends?
Yes. State the field joint procedure and the ends are prepared to suit rather than shipped plain.
Which grades can we specify?
ASTM A53 GR A, GR B and GR C, EN S275 through S355J2H, GB Q195 to Q345 and the L175 to L555 line pipe series.
What documentation ships with the order?
An EN 10204/3.1B certificate carrying the chemical and mechanical results, together with the API 5L, ISO9001, BV, SGS and RoHS certification held for the product.
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