DTC ERW Straight Seam Welded Steel Pipe | Carbon Steel Tube

Product Overview

DTC ERW (Electric Resistance Welded) straight seam welded steel pipe is manufactured by high‑frequency electric resistance welding process, where steel strip is formed into a tubular shape and welded along a straight longitudinal seam. With uniform weld quality, consistent dimensions and cost‑effective pricing, our ERW pipes are widely used in water supply, drainage, structural support, scaffolding, fencing and general industrial piping applications.

Core Product Advantages

• High‑Frequency Welding Process: ERW technology produces uniform, strong weld seams with consistent quality
• Cost‑Effective Solution: Lower cost compared with seamless steel pipe for general‑purpose applications
• Uniform Dimensions: Precise outer diameter and wall thickness for easy fitting and connection
• Smooth Surface Finish: Clean surface ready for painting, galvanizing or further processing
• Wide Size Range: Various diameters and wall thicknesses to meet different project requirements
• Versatile Applications: Suitable for fluid transport, structural use and general engineering

Available Surface Treatments

• Black (as‑welded) — standard bare steel pipe
• Hot‑dip galvanized — anti‑corrosion for outdoor and buried use
• Painted / Coated — for decorative or specific anti‑corrosion needs
• 3PE / 2PE anti‑corrosion coating — for underground buried pipelines

Technical Specifications

• Material: Q235B, Q355B, 20# carbon steel
• Production Process: High‑Frequency Electric Resistance Welding (ERW)
• Outer Diameter: 21.3mm‑630mm
• Wall Thickness: 1.5mm‑12mm
• Standard Length: 6m, 9m, 12m (custom cut‑to‑length available)
• Pressure Rating: PN6 to PN25
• End Type: Plain end, Beveled end, Threaded end
• Surface Treatment: Black, Galvanized, Painted, 3PE coated
• Executive Standard: GB/T 3091, GB/T 13793, ASTM A53, API 5L, EN 10219

Application Scenarios

• Municipal water supply and drainage pipelines
• Building structural supports and columns
• Scaffolding and formwork systems
• Fencing, railing and guardrail systems
• General industrial process piping
• Greenhouse and agricultural structures
• Fire protection sprinkler systems
• HVAC and ventilation ducts
• Oil and gas gathering pipelines

Quality Assurance

DTC ERW straight seam welded steel pipes are manufactured under strict ISO 9001 quality management systems and comply with national and international steel pipe standards. Every batch undergoes weld ultrasonic testing, hydrostatic pressure testing, dimensional inspection and surface quality verification before delivery. We provide complete material test reports (MTR) for engineering bidding and project acceptance.

Contact us for size selection, surface treatment options and bulk‑order quotation!