Pile of galvanized round steel pipes on gravel ground

Galvanized Steel Pipe, Welded Pipe

Galvanized Welded Round Steel Pipe to ASTM A53 and BS1387

Name: Galvanized Welded Round Steel Pipe
Brand: Tianyu Metal

Zinc coated welded round pipe from 21.3mm to 660.4mm outside diameter

Galvanized welded round steel pipe is longitudinally welded round tube finished with a zinc coating so the outer surface does not need painting once it is installed. It is specified by water and gas contractors, structural fabricators and distributors who order against ASTM A53, EN10217, DIN 2458, IS 3589, JIS G3452 and BS1387. Buying the coating and the pipe together removes the separate galvanizing step that normally sits between the mill and the site, and removes the handling damage that step causes. Each shipment is released against an EN 10204/3.1 certificate covering chemistry, mechanical results and the pressure test.

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Product Name — Galvanized Welded Round Steel Pipe
Form — Welded round pipe, galvanized
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 Galvanized Welded Round Steel Pipe

Corrosion Barrier Applied Before Delivery

The zinc layer is already on the pipe when it reaches you, so there is no site painting stage and no waiting for a coating subcontractor before installation starts.

Diameter Band from Service Line to Header

Outside diameter runs from 21.3mm to 660.4mm, so small branch runs and large collection headers can be ordered on one contract instead of split between two suppliers.

Wall Thickness Chosen per Duty

Wall thickness from 1.5 to 22.2mm lets you keep thin wall on low pressure distribution and step up wall only on the sections that carry the working pressure.

Cut Lengths Instead of Fixed Mill Lengths

Lengths from 0.3 to 18 M are available, so short spool pieces and long straight runs both arrive ready to install with less offcut in the yard.

Grade Set That Matches Local Codes

ASTM A53 GR A and GR B, EN S275 through S355J2H and GB Q195 through Q345 are all covered, which keeps one supplier valid across projects written to different codes.

Test Results Issued with the Material

Chemical analysis, tensile, yield, elongation, flattening, bending, blow, impact, dimensional and hydrostatic results are reported on the EN 10204/3.1 certificate.

Problems It Solves

What This Material Removes From Your Process

Galvanizing Handled as a Separate Contract

Sending black pipe out for coating adds a stage, a second transport leg and an extra invoice. Ordering galvanized welded pipe removes that stage from the schedule.

Codes That Differ Between Projects

One job is written to ASTM A53, the next to BS1387 or JIS G3452. The same size band is supplied against all of them so the buyer does not requalify a supplier per project.

Offcuts Created by Fixed Length Pipe

Standard mill lengths force cutting on site and leave short ends. Lengths between 0.3 and 18 M can be ordered so the delivered pieces match the run.

Pressure Test Evidence Arriving Late

Hydrostatic and flattening results are reported with the shipment on the EN 10204/3.1 certificate instead of being chased after delivery.

Mixed Supply Across Small and Large Bores

Small bore and large bore are often bought from different mills. The 21.3mm to 660.4mm band covers both on one order.

Application Scenarios

Where It Is Used

Water and Gas Distribution Lines

Pipework ordered to BS1387 and JIS G3452 for low pressure water and gas service runs where the outside of the pipe is exposed to weather or damp ground.

Low Pressure Transmission in L Grades

Runs specified in L175, L210, L245, L320 and the L360 to L555 range where a galvanized outer surface is wanted on a welded body.

Structural Frames and Supports

Posts, handrails, frames and pipe supports built in S275, S275JR, S355JRH and S355J2H where the finished structure stays outdoors.

Large Diameter Collection Headers

Headers and manifolds toward the 660.4mm end of the range with wall thickness selected up to 22.2mm for the pressure carried.

Prefabricated Spools and Short Fittings

Short pieces from 0.3 M upward for spool fabrication, nipples and jointing sections cut before the coating is disturbed by site work.

Stockholder Range Filling

Distributors covering the full 21.3mm to 660.4mm band in Q195, Q215, Q235 and Q345 so local buyers find the size they need in stock.

Who It Is For

Buyers Who Specify This Product

Water and gas contractors buying galvanized service pipe for distribution networks
Mechanical contractors ordering pipe spools that must not be painted on site
Structural fabricators buying round tube in S275 and S355 for outdoor frames and supports
Pipeline procurement engineers sourcing L grade welded pipe with a zinc finish
Steel stockholders filling the 21.3mm to 660.4mm size band for local resale
Project buyers who need the EN 10204/3.1 certificate filed with the material record

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.

Galvanized Welded Round Steel Pipe specifications
Product Name	Galvanized Welded Round Steel Pipe
Form	Welded round pipe, galvanized
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
Certificate	EN 10204/3.1
Tests	Chemical component analysis, tensile, yield, elongation, flattening, bending, blow, impact, exterior size inspection, hydrostatic
Place of Origin	China

Technical Features

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
Galvanized outer surface on a longitudinally welded round body
Certificate EN 10204/3.1 issued per shipment

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
Zinc coating on the finished pipe surface

Certification

ISO9001
BV
SGS
RoHS
EN 10204/3.1 certificate issued with the shipment

Manufacturing

How It Is Made and Processed

Strip decoiling to the width required for the ordered diameter
Forming the strip to a round section
Longitudinal welding of the seam
Sizing to the ordered outside diameter between 21.3mm and 660.4mm
Galvanizing of the pipe surface
Hydrostatic testing and exterior size inspection
Cutting to ordered length between 0.3 and 18 M
Bundling, marking and loading for export

Quality Control

Checks Before It Ships

Chemical component analysis against the ordered grade
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 and length
EN 10204/3.1 certificate issued for the shipment

Customization

What We Can Change on Your Order

Outside diameter selected anywhere between 21.3mm and 660.4mm
Wall thickness set between 1.5 and 22.2mm for the duty
Cut lengths from 0.3 to 18 M against your pipe list
Grade chosen from the ASTM, EN or GB lists to suit the project code
Bundle marking and packing arranged for the destination port

Comparison

Galvanized Welded Round Steel Pipe Against the Alternatives

Black welded round pipe	The zinc coating is applied before delivery, so the outer surface needs no site painting and the pipe does not travel to a separate coating shop.
Seamless carbon steel pipe	A welded body in the same 21.3mm to 660.4mm band is generally easier to source in large quantities at a set wall thickness.
Plastic water service pipe	Steel carries structural load and can be threaded, welded or clamped into existing metal pipework without a transition fitting.
Galvanized square or rectangular tube	A round section is the one that matches pipe fittings, flanges and threaded couplings used on water and gas distribution.

Use Guide

Specifying Handling and Welding Notes

Confirm which standard the project is written to before ordering because ASTM A53, BS1387 and JIS G3452 use different grade names
Pick wall thickness from the 1.5 to 22.2mm band against the working pressure rather than the diameter alone
Order cut lengths within the 0.3 to 18 M range so fewer cuts are made after the coating is on
Protect the zinc layer during unloading and stacking and avoid dragging pipe off the bundle
Where the pipe is welded on site, treat the heat affected zone so the joint is not left as the weak point of the coating
Ask for the mill test certificate to EN 10204/3.1 at order stage so it travels with the material

Questions Buyers Ask

Galvanized Welded Round Steel Pipe FAQ

What diameter and wall range can you supply galvanized?

Outside diameter runs from 21.3mm to 660.4mm and wall thickness from 1.5 to 22.2mm. Tell us the bore and working pressure and we will confirm the combination.

Which standards do you make this pipe to?

ASTM 53, EN10217, DIN 2458, IS 3589, JIS G3452 and BS1387. State the one your specification names and the grade will be matched to it.

What certificate comes with the pipe?

An EN 10204/3.1 certificate is issued covering chemistry, mechanical results, dimensional inspection and the hydrostatic test.

Can you cut the pipe to our lengths instead of shipping mill lengths?

Yes. Lengths from 0.3 to 18 M are available, so send your pipe list and the material can be cut before packing.

Which grade should we ask for if our drawing only says structural?

S275, S275JR, S355JRH and S355J2H cover most structural calls, while Q195 through Q345 are the GB equivalents. Send the drawing note and we will confirm.

Do you supply the L grades in galvanized condition?

L175, L210, L245, L320 and the L360 to L555 range are listed for this pipe. Confirm the grade and the diameter and we will check availability.

How is the pipe packed for sea freight?

Pipe is bundled and marked before loading. Tell us the destination port and the handling equipment on site so the bundle size suits it.

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Need a Price on Galvanized Welded Round Steel Pipe

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