Tianjin Yuantai Derun Steel Pipe Manufacturing Group Co., Ltd. focuses on providing a variety of steel pipe products, including Longitudinal Submerged Arc Welded Pipe (LSAW or Electric Resistance Welded Pipe, ERW)
Features of Yuantai Derun Longitudinal Submerged Arc Welded Pipe
1. Production process
•High frequency resistance welding (ERW): suitable for the production of small and medium diameter steel pipes. The heat generated by high frequency current melts the edges of the strip and combines them under pressure to form a strong weld.
•Double-sided submerged arc welding (LSAW): used for the manufacture of large diameter steel pipes, using submerged arc welding technology to weld on both the inside and outside at the same time to ensure the quality of the weld.
2. Material and specification
•Material: Usually use different grades of carbon structural steel or other alloy steel materials such as Q195, Q235, Q355, etc. The specific choice depends on the application requirements.
•Wide range of specifications: Various specifications of steel pipes with diameters ranging from smaller to larger sizes can be produced, and special sizes and thicknesses can be customized according to customer needs.
3. Surface treatment
•Galvanizing: Improve the corrosion resistance of steel pipes and extend their service life.
•Painting or coating: Surface coating is carried out according to customer requirements, which not only enhances the anti-corrosion ability but also beautifies the appearance.
4. Strict quality control
•Raw material testing: Strict chemical composition analysis and mechanical property tests are carried out on each batch of steel entering the factory.
•Production process monitoring: Implement full quality monitoring throughout the entire production process, including inspections of dimensional accuracy, weld quality, etc.
•Finished product inspection: Finished products must undergo a series of strict inspection procedures, such as water pressure testing, non-destructive testing, etc., to ensure that product quality meets standard requirements.
1. Main applications of straight seam welded pipes
Fluid transportation
•Oil and natural gas: low-pressure transmission pipelines (such as branch pipelines, gathering pipelines).
•Water conservancy projects: water pipelines, drainage systems, agricultural irrigation pipelines.
•Chemical industry: transportation of non-corrosive liquids or gases (materials need to be selected according to the medium).
Construction and structural engineering
•Building frame: used for supporting columns, beams, trusses, etc. for steel structure buildings.
•Scaffolding: used as a vertical pole or horizontal pole of a light scaffolding, which is easy to build quickly.
•Fences and guardrails: such as support pipes for construction site enclosures and road guardrails.
Machinery manufacturing
•Equipment housing: such as the frame structure of the fan and air conditioner housing.
•Conveying equipment: non-high-pressure load-bearing components such as conveyor rollers and drive shafts.
Automobile and transportation
•Vehicle chassis: structural parts of light trucks and trailers.
•Transportation facilities: support pipes for street lamp poles and traffic sign poles.
Other fields
•Furniture manufacturing: skeletons of metal furniture (such as shelves and booths).
•Power engineering: cable protection sleeves, transmission tower structural parts.
Specifications of straight seam welded pipe models
The specifications of straight seam welded pipes are usually divided by outer diameter (OD), wall thickness (WT), and material, and follow international or national standards. The following are common classifications and typical specifications:
1. Classification by manufacturing process
High frequency resistance welding (ERW pipe):
•Process: Use high frequency current to heat the edge of the steel plate and weld under pressure.
•Features: Narrow weld, high efficiency, suitable for thin-walled pipes (wall thickness ≤ 20mm).
•Application: Low-pressure fluid transportation, structural support.
Submerged arc welding (LSAW pipe, straight seam double-sided submerged arc welding):
• Process: Submerged arc welding technology is used, both sides are welded, and the weld strength is high.
• Features: The wall thickness is relatively large (usually ≥6mm), suitable for high pressure or high load occasions.
• Application: Long-distance oil and gas pipelines, large-scale structural projects.
| standard | Specification Range | material | Application scenarios |
| GB/T 3091-2015 | Outer diameter: 21.3mm~610mm; Wall thickness: 2.0mm~25mm | Q195、Q235、Q345 | Low-pressure fluid transportation, building structure |
| ASTM A53 | Outer diameter: 1/8″~26″; Wall thickness: SCH40, SCH80, etc. | Gr.A、Gr.B | General purpose pipelines (water, gas) |
| API 5L | Outer diameter: 10.3mm~1422mm; Wall thickness: 1.7mm~50mm | X42, X52, X60, etc. | Oil and gas transmission pipelines |
| EN 10219 | Outer diameter: 10mm~600mm; Wall thickness: 1.0mm~40mm | S235、S355 | Building structure, machinery manufacturing |
3. Examples of common specifications
• Thin-walled pipe: OD 21.3mm×Wall thickness 2.0mm (GB/T 3091), used for low-pressure water pipes.
• Medium-thick walled pipe: OD 219mm×Wall thickness 6mm (API 5L X52), used for oil and gas gathering and transportation.
• Large-diameter pipe: OD 610mm×Wall thickness 12mm (LSAW process), used for main pipes of water conservancy projects.