RHS SHS CHS Galvanized ERW Steel Pipe

RHS SHS CHS Galvanized ERW Steel Pipe is a high-performance, corrosion-resistant piping solution widely used in construction, infrastructure, and industrial applications. It combines the inherent strength and ductility of carbon steel with a protective zinc coating applied through a galvanizing process, typically hot-dip galvanizing. This dual-attribute product is manufactured by forming and welding carbon steel strips or plates using electric resistance welding, followed by surface galvanization ‌

Basic info

Manufacturing Process

The production involves two primary stages:

‌ERW Pipe Manufacturing:‌ Steel coils (typically grades like Q235, Q355, or equivalent to API 5L ASTM A53 Grade A/B) are uncoiled, formed into a cylindrical shape through a series of rolls, and the edges are welded together using electric resistance welding to create a seamless bond.

‌Galvanizing:‌ The formed ERW pipe undergoes surface cleaning (pickling and fluxing) and is then immersed in a molten zinc bath (hot-dip galvanizing), resulting in a metallurgically bonded zinc-iron alloy layer on its surface.

Features

‌Superior Corrosion Resistance:‌ The zinc coating acts as a robust barrier and provides sacrificial anode protection, significantly extending the pipe's service life in humid, corrosive, or outdoor environments compared to uncoated carbon steel pipes. 

‌High Strength and Durability:‌ The base material is carbon steel, offering excellent mechanical properties, including high tensile strength and good load-bearing capacity, suitable for structural applications and fluid conveyance under pressure.

‌Cost-Effectiveness:‌ ERW manufacturing is an efficient process, and carbon steel is widely available, making this product a more economical choice than many alloy or stainless-steel alternatives while offering enhanced corrosion protection over plain carbon steel .

‌Excellent Weldability and Formability:‌ The pipe maintains good workability, allowing for easier on-site cutting, welding (with proper techniques for galvanized surfaces), and fabrication into various structural and piping systems ‌.

‌Aesthetic and Protective Finish:‌ The galvanized layer provides a uniform, silvery-gray finish that improves appearance and offers additional protection against abrasion and minor mechanical damage

Applications

Construction & Infrastructure:‌ Scaffolding, structural frameworks, handrails, fence posts, and curtain wall systems.

‌Fluid Conveyance:‌ Water supply lines, plumbing, fire sprinkler systems, and low-pressure gas distribution (where codes permit).

‌Industrial Uses:‌ Support structures, cable conduits, agricultural equipment, and greenhouse frames.

‌Outdoor and Corrosive Environments:‌ Marine applications (non-saltwater immersion), chemical plant piping (for non-corrosive media), and any setting exposed to weather

quality control

RHS SHS CHS Galvanized ERW Steel Pipe undergoes strict inpections per standards reuqirements:

* Hydrostatic Pressure Test
* Non-Destructive Test (Eddy Current, Ultrasonic)

* Chemical composition test
* Mechanical Property Test
* Dimension & Visual Inspection
* Full Traceability (Mill Test Certificates 3.1 provided)

* Accept the third party inspection before shipment

shipment