Q235B Fluid Transport Pipes

Q235B Fluid Pipeline Product Introduction

Q235B fluid transport pipes are widely used in urban water supply, fire protection, and industrial piping systems. This series of pipes is manufactured using high-quality Q235B carbon structural steel, possessing excellent plasticity, toughness, and weldability. Employing high-frequency straight seam welding technology, the welds are smooth, high-strength, and dimensional tolerances are strictly controlled within standard ranges. Meeting the pressure and flow requirements of various fluid transport scenarios, it is an ideal choice for stable and safe transport.

Manufacturing Process Standards for Q235B Welded Steel Pipes for Fluid Transportation

1. High-Frequency Resistance Welding (ERW) Process: Suitable for pipes with diameters below DN400. Utilizing a 100-450kHz high-frequency current, the pipe blank edge is instantly heated to a molten state through the skin effect and proximity effect. Solid-state welding is achieved through extrusion roll forging. After welding, internal and external flash is removed simultaneously, and online weld normalizing treatment is performed to ensure a dense weld structure and mechanical properties consistent with the base material.

2. Submerged Arc Welding (SAW) Process: Suitable for large-diameter, thick-walled pipes above DN400. Employing JCOE/UO forming and double-sided submerged arc welding technology. The arc burns under the flux layer, achieving deep penetration welding and a dense, pure weld. After welding, the entire pipe body undergoes mechanical expansion to precisely calibrate the geometric dimensions and eliminate residual stress, significantly improving the pipe's pressure uniformity and dimensional stability.

Q235B Fluid Pipeline Processing

It ensures uniform welds free of porosity and cracks. Combined with fully automated ultrasonic and X-ray flaw detection technology, it guarantees the uniformity of weld density and strength in every Q235B fluid pipe. Both inner and outer surfaces undergo shot blasting for rust removal, resulting in a high-gloss finish. Depending on customer needs, rust-proof coatings, epoxy resin spraying, or hot-dip galvanizing are available to further extend service life. The sophisticated manufacturing process ensures the steel pipe maintains excellent sealing performance and stable internal pressure stability during long-distance transportation.

About us

GNEE STEEL offers integrated services including cutting, beveling, flange welding, and threading to meet diverse on-site requirements. In numerous large-scale infrastructure projects, our Q235B steel pipes, with their high strength and excellent weldability, have become a mainstay of the system's piping network.

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