ERW Square and Round Black Welded Steel Pipe ASTM A53 BS1387 DIN2244

1．Product Overview

ERW square and round black welded steel pipes are used for structural engineering, steel fabrication, industrial construction, fencing systems, machinery manufacturing, infrastructure projects, agricultural structures, and furniture frames.

The product is available in round, square, rectangle, and ellipse profiles. Black welded pipe is commonly selected for welding, painting, machining, and secondary fabrication. Galvanized and oil coated surface options are also available for corrosion protection and temporary storage protection.

2．Technical Solution

The pipe is manufactured by forming steel strip into the required profile and welding it through ERW technology. The process supports stable weld seam quality, controlled dimensional tolerance, and consistent pipe geometry.

Black surface finish is suitable for fabrication and painting applications. Galvanized coating improves corrosion resistance for outdoor and humid environments. Oil coated surface provides temporary corrosion protection during storage and transportation.

Different pipe profiles can be selected according to load-bearing, installation, and appearance requirements.

3．Specifications

4．Application

This product is suitable for steel frameworks, support structures, machinery frames, welded structures, handrails, fencing, guardrails, vehicle structures, trailer structures, greenhouse framework, pipe supports, metal furniture, decorative tubing, and general engineering fabrication.

Round welded pipes are suitable for general construction and pipe structure applications.

Square welded pipes are suitable for heavy structural frameworks, frames, supports, and load-bearing fabrication.

Rectangle welded pipes are suitable for machinery bases, braces, racks, and fabricated structures.

Ellipse welded pipes are suitable for decorative structures and visible frame components.

5．Processing

The welded steel pipes support cutting, welding, bending, punching, drilling, galvanizing, painting, bundling, and secondary fabrication.

Customized pipe length and additional surface treatment can be supplied according to project requirements.

6．Advantages

• ERW welding technology provides stable weld seam quality and dimensional consistency.
• Round, square, rectangle, and ellipse profiles support different structural and fabrication requirements.
• Black surface finish is suitable for welding, painting, and secondary processing.
• Galvanized and oil coated surfaces are available for different corrosion protection requirements.
• The wide size range supports both light-duty and heavier structural applications.
• Standard export packing supports container shipment and long-distance transportation.

7．How to Choose

• Choose black welded pipe for fabrication, welding, machining, and painting.
• Choose galvanized welded pipe for outdoor structural use and humid environments.
• Choose oil coated pipe when temporary corrosion protection is required during storage or shipment.
• Choose square or rectangle pipe for heavy structural frameworks and support systems.
• Choose round welded pipe for general construction and pipe structure applications.
• Choose ellipse pipe for decorative structures and visible frame components.
• Confirm pipe shape, size, wall thickness, standard, surface finish, length, and packing method before production.

8．FAQ

Q1．What pipe shapes are available

Round, square, rectangle, and ellipse welded steel pipes are available.

Q2．What surface treatments can be supplied

Black, galvanized, and oil coated surface finishes are available.

Q3．What standards are supported

ASTM A53, BS1387, DIN2244, GB/T13793, GB/T3091, GB/T6725, and GB/T6728 standards are supported.

Q4．Can customized lengths be supplied

Yes. Standard lengths are 5.8M and 6M, and customized lengths can be produced.

Q5．What industries commonly use ERW welded steel pipes

They are widely used in construction, industrial fabrication, transportation, infrastructure, agricultural engineering, furniture manufacturing, and general steel structures.