Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Welded Pipe, Steel Pipe
ERW Steel Casing Pipe for Drilling and Crossing Work
Electric resistance welded casing pipe with coating options and full body testing
ERW casing pipe is electric resistance welded steel pipe used as a protective outer pipe around a service line or bore rather than as the pressure carrying line itself. Drilling contractors, crossing specialists and machinery builders order it against ASTM A53, EN10217, DIN 2458 and JIS G3452 in wall thicknesses from 1.5 to 22.2mm. Because the casing stays in the ground long after the job finishes, buying it already coated and hydrostatically tested avoids a return visit to a line that cannot be reached again. The consignment is released on an EN 10204/3.1Ba certificate.
- Product Name — ERW Welded Steel Pipe Casing 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 Casing Pipe
Coating Applied Before the Casing Is Buried
Fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen or black oil coating is applied to the customer requirement, which matters most on a casing that will never be inspected again.
Wall Thickness for Ground and Traffic Load
Wall thickness runs from 1.5 to 22.2mm so a casing under a road or rail crossing can be specified heavier than one in open ground.
Bore Sizes That Clear the Carrier Pipe
Outside diameter from 21.3mm to 660.4mm gives room to select a casing that clears the carrier pipe and its spacers without moving to a spiral welded body.
Body Integrity Confirmed at the Mill
Hydrostatic testing plus flattening, bending, blow and impact testing confirm the welded body before the casing is pushed or bored into position.
Length Selection for Push and Jack Sections
Lengths from 0.3 to 18 M let you order the joint length your jacking or boring rig handles rather than cutting stock pipe down.
Grades Quoted Across Code Families
ASTM A53 GR A and GR B, EN S275 through S355J2H and GB Q195 through Q345 are all available, so the casing matches whatever the project specification names.
Problems It Solves
What This Material Removes From Your Process
Casing That Cannot Be Reached After Installation
Once a sleeve is bored under a road it stays there. Factory coating and a mill hydrostatic test move the inspection to a point where a fault can still be corrected.
Casing Diameter Too Tight for the Carrier
A casing that does not clear the carrier pipe and spacers has to be re bored. Selecting diameter across the 21.3mm to 660.4mm band avoids the forced compromise.
Joint Length Wrong for the Rig
Long joints cannot be handled in a small jacking pit. Lengths from 0.3 to 18 M let the delivered joint match the working space.
Thin Wall Deforming Under Push Load
A casing pushed through ground takes axial and point load. Wall thickness up to 22.2mm can be specified where the push distance is long.
Coating Chosen After the Pipe Arrives
Deciding the coating late means site applied wrap. The coating system is fixed at order so the pipe ships in the final condition.
Application Scenarios
Where It Is Used
Oil Drilling Site Casing
Casing and sleeve pipe on drilling sites where a welded body in a standard grade is specified for the duty.
Road and Rail Crossing Sleeves
Protective casing around a carrier line at a crossing, where wall thickness is chosen toward the upper end of the 1.5 to 22.2mm band.
Cable and Conduit Protection
Casing pipe run to shield cables and small service lines from ground movement and excavation damage.
Low Pressure Liquid Service
Where the same pipe is used directly for low pressure transport of water, gas or oil rather than as an outer sleeve.
Machinery Manufacturing Components
Sleeves, housings and structural tubes on fabricated machinery built from welded pipe in Q235, Q345 or S355 grades.
Water Well and Bore Lining
Lining pipe for bores where a coated welded body from 21.3mm to 660.4mm suits the hole diameter.
Who It Is For
Buyers Who Specify This Product
- Drilling contractors buying casing and sleeve pipe for site work
- Trenchless and crossing contractors ordering casing to sleeve a carrier pipeline
- Civil engineers specifying casing under roads rail lines and watercourses
- Utility contractors buying conduit pipe to protect buried cable runs
- Machinery fabricators sourcing welded tube for sleeves housings and frames
- Buyers who need the hydrostatic result documented before the casing is buried
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 Casing 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 ERW body
- 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
- Surface treatment fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen or black oil coating
- Grades ASTM A53 GR A and GR B, EN S275 to S355J2H and GB Q195 to Q345
- Certificate EN 10204/3.1Ba with hydrostatic test result
Materials
- Carbon steel strip in ASTM A53 GR A and GR B
- EN grades S275, S275JR, S355JRH and S355J2H
- GB grades Q195, Q215, Q235 and Q345
- Line pipe grades L175, L210, L245, L320 and L360 to L555
- External coating materials including epoxy, 3PE and bitumen systems
Certification
- ISO9001
- BV
- SGS
- RoHS
- EN 10204/3.1Ba certificate issued with the shipment
Manufacturing
How It Is Made and Processed
Strip uncoiling and edge preparation
Roll forming to the ordered casing diameter
Electric resistance welding of the longitudinal seam
Sizing and straightening of the formed pipe
Hydrostatic test and exterior size inspection
External coating to the ordered system
Cutting to the joint length required between 0.3 and 18 M
End protection, bundling and marking for export
Quality Control
Checks Before It Ships
- Chemical component analysis of the strip against the ordered grade
- Tensile strength, yield strength and elongation testing
- Flattening, bending, blow and impact testing of the welded body
- Hydrostatic test before the coating stage
- Exterior size inspection covering diameter, wall and joint length
- EN 10204/3.1Ba certificate released with the consignment
Customization
What We Can Change on Your Order
- Casing diameter selected between 21.3mm and 660.4mm to clear the carrier pipe
- Wall thickness from 1.5 to 22.2mm set against push load and cover depth
- Joint length from 0.3 to 18 M to suit the jacking pit or boring rig
- Coating system chosen from epoxy, 3PE, bitumen or black oil
- Grade selected from the ASTM, EN or GB lists
- Bundle marking and end protection for the destination port
Comparison
ERW Welded Steel Pipe Casing Pipe Against the Alternatives
| Spiral welded casing | The ERW body covers the smaller casing sizes below 660.4mm where a spiral seam is not used, with a straight longitudinal seam along the joint. |
|---|---|
| Concrete or HDPE duct | Steel casing takes jacking and axial load directly and can be welded joint to joint to make a continuous sleeve. |
| Seamless casing pipe | ERW gives a consistent wall thickness from strip and is usually easier to obtain in quantity at one diameter for a crossing package. |
| Uncoated casing wrapped in the trench | Factory coating is applied under controlled conditions, which matters on a casing that will not be exposed again for inspection. |
Use Guide
Specifying Handling and Welding Notes
- Size the casing bore so the carrier pipe and its spacers pass through without contact
- Select the wall thickness from the 1.5 to 22.2mm band against the jacking distance and the cover over the casing
- Order joint lengths that suit the pit or rig rather than cutting long joints after coating
- Check the coating at each field weld and make good before the casing is pushed
- Store coated joints on timber supports and avoid point loads on the coating
- Ask for the mill test certificate to EN 10204/3.1Ba so the hydrostatic record stays with the crossing file
Questions Buyers Ask
ERW Welded Steel Pipe Casing Pipe FAQ
What is the difference between this and your ERW line pipe?
The body is the same electric resistance welded pipe. Casing pipe is specified as the outer protective pipe around a service line or bore, so diameter is chosen for clearance and wall for push load.
What casing sizes can you make?
Outside diameter from 21.3mm to 660.4mm with wall thickness from 1.5 to 22.2mm. Send the carrier pipe size and spacer type and we will confirm the casing bore.
Can the casing be supplied coated?
Yes. Fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen and black oil coatings are applied as per customer requirement.
What joint lengths do you cut to?
Anything from 0.3 to 18 M. Tell us the length your jacking pit or boring rig can handle and the joints will be cut before packing.
Is the casing pressure tested?
A hydrostatic test is carried out along with flattening, bending, blow and impact testing, and the results are reported on the EN 10204/3.1Ba certificate.
Which grade do you normally supply for casing work?
ASTM A53 GR B and the GB Q235 and Q345 grades are the common calls, with EN S275 and S355 available where the drawing is written to EN.
Can we order a trial quantity before the main crossing package?
Yes. Give us the diameter, wall, length and coating and we will quote the trial quantity on the same specification as the main order.
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