Q235B Straight Seam Welded Steel Pipe

Q235B straight seam welded pipe belongs to carbon structural steel pipe, with mature smelting process and low raw material price. Compared with alloy steel (such as Q345B) or stainless steel, the cost is reduced by about 30%-50%, which is suitable for large-scale engineering procurement.

Excellent processing performance
Strong welding adaptability: Q235B has low carbon content (≤0.2%) and alloy element content, and it is not easy to produce hardened structure or cracks during welding. Common processes such as manual arc welding and submerged arc welding can be used. The weld quality is stable and suitable for on-site splicing and installation.
Good plasticity and toughness: The elongation at room temperature is ≥23%, it is not easy to break brittlely when stressed, and can adapt to slight deformation. It is often used in scenes with medium strength requirements such as building structures and non-high-pressure pipelines.

High specification flexibility
The customizable outer diameter range is usually Φ114-Φ3000mm, and the wall thickness is 3-40mm, which is especially suitable for large diameter (such as Φ630 and above) and non-standard size requirements. However, seamless steel pipes are limited by rolling process, and the cost of large diameter specifications is extremely high.

 

Q235B LSAW Pipe in stock

 

Applications

• Construction engineering: used as steel structure pillars, scaffolding, bridge supports, etc., such as plant columns and municipal pipeline supports.
• Fluid transportation: suitable for low-pressure water, steam, air and other medium transportation (working pressure ≤1.6MPa), such as urban water supply and drainage, heating pipelines.
• Machinery and agriculture: can be processed into mechanical parts (such as rollers, brackets) or agricultural irrigation pipelines, and the cost performance is significant when the corrosion resistance requirements are not high.

Appearance inspection:

Check whether the surface of the high-frequency welded pipe has defects such as cracks, folds, delamination, scarring, etc. For the weld, check whether the surface is flat, whether there are pores, slag inclusions, unfused, undercuts and other welding defects. Minor surface defects can be repaired according to the standard, and re-inspected after repair.

Dimensional accuracy inspection:

Strictly inspect the outer diameter, wall thickness and length of the welded pipe. The allowable deviation of the outer diameter, the allowable deviation of the wall thickness and the length deviation must comply with the relevant standards to ensure the adaptability and safety of the welded pipe during use. For example, the outer diameter deviation is generally around ±1%, and the wall thickness deviation is around ±10% (the specific deviation range may vary according to different standards and pipe diameters).

Non-destructive testing:

Use ultrasonic testing, eddy current testing and other methods to check the internal quality of the welded pipe. Ultrasonic testing can detect whether there are defects such as inclusions, pores, cracks, etc. inside the welded pipe; eddy current testing is mainly used to detect defects on the surface and near the surface of the welded pipe to ensure that the quality of the welded pipe meets the requirements.

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