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    ERW Steel Pipe rolled tube welded pipe

    Main products:seamless steel pipe, round steel, welded pipes, spiral pipes, galvanized pipe, alloy pipes, stainless steel, threaded steel, angle grooves, aluminum plates, U-shaped steel and other dozens of products, hundreds of steel grade materials.

    Product Details(Feature/Advantages)


  • Delong Metal is group company in the steel manufacture & Trading, founded in the 2000s, 800+ staff, 25, 000+ m2 non-dust workshop, 40+ great large mills and cooperation partners in China, 4000, 000+ MT production per year under ISO management, 40, 000+customers in domestic and overseas market, 10 billion USD of annual turnover, 15+ subsidiary companies all over China, ranking the Top 100 private enterprises in China, 1 hour reach Shanghai/Tianjin /Guangzhou Port, we keep high quality, competitive price, thousands tons of stock, most efficient delivery and reliable cooperation for global valued customers. We have been engaging industry steel for over 20 years, best service and the most competitive price is one of our greatest advantages that make us today!

    We operate within the scope of ISO 9001: 2015 accredited management system and the raw materials are procured from suppliers in compliance with ASTM, BS EN and DIN standards.Our products are rigorously inspected to ensure they are within tolerance of our customer′s specifications, we work with accredited laboratories for specialised material testing and chemical analysis.In addition, we use X-ray fluorescence technology to meet our high inspection standards and to ensure that our customers get the best quality products.

  • In recent years, our company has always occupied the market with high-quality products. The products are exported to Southeast Asia, Central Asia, North Africa, South America and other regions. We always give the buyer high-quality products, low prices, good service, one-time cooperation for lifelong friends. Welcome domestic and international friends to inquire for a better future together!

  • MOQ 10 tons
    Thickness 1mm-200mm
    Width 1000mm-3000mm
    Length 1000mm-12000mm
    Standard AISI, ASTM, BS, DIN, JIS, GB, etc
    Grade A572, A573, A633, A678, A709, A710, G3101, G3136, etc
    Tpye Steel plate
    Surfacing Coated, galvanized, black bared
    Productive Technology Hot Rolled & Cold Rolled
    Port TIANJIN
    Payment Terms L/C, T/T
    Delivery 15-25 days after deposit or according to customers’ quantity
    Packing                standard seaworthy export packing or as the request of customers



  • Keywords: ERW Pipe, ERW Steel Pipe, Electric Resistance Welded Pipe
  • Size: OD: 21.3mm ~ 660mm;WT: 1mm ~ 17.5mm; LENGTH: 0.5mtr ~ 22mtr (5.8/6/11.8/12 meters, SRL, DRL)
  • Standard & Grade : ASTM A53, Grade A/B/C
  • Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
  • Delivery: Within 30 days and Depends on your order quantity
  • Payment: TT, LC , OA , D/P
  • Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
  • Usage: For Low Pressure Fluid Transmission, Machinery Manufacturing
  • Production Process for ERW steel pipe:  
  • 1.Uncoiling — 2. Leveling — 3. End cutting — 4. End shearing welding — 5. Super coil accumulator — 6. Edge cutting — 7. Ultrasonic detection — 8. Forming — 9. Electric induction welding — 10. Ultrasonic detection for weld seam — 11. Medium frequency heat treatment — 12. Air cooling — 13. Water cooling — 14. Sizing — 15. Flying cutting — 16. Flush-out — 17. Cropping — 18. Flattening testing — 19. Straightening — 20. End facing and bevelling — 21. Hydrodynamic testing — 22. Ultrasonic detection for weld seam — 23. Ultrasonic detection for pipe end — 24. Visual and dimensions inspection — 25.Weighting and measuring — 26. Marking — 27. Coating — 28. Pipe-end protection — 29. Bending — 30. Shipping


  • Tolerances of Outside Diameter – ERW Steel Pipe
  • Standard Out Diameter Tolerance of Pipe End Tolerance of Pipe Body
    API 5L 219.1-273.1 +1.6mm, -0.4mm ±0.75%
    274.0- 320 +2.4mm, -0.8mm ±0.75%
    323.9- 457 +2.4mm, -0.8mm ±10.75%
    508 *2,4mm, -0.8mm ±0.75%
    559-610 +2.4mm, -0.8mm ±0.75%
    GB/T 9711-1
    ISO3183-1
    219.1-273.1 +1.59mm, -0.4mm ±0.75%
    219.1-273.1 2.38mm, -0.79mm ±0.75%
    219.1-273.1 2.38mm, -0.79mm ±1%
    219.1-273.1 2.38mm, -0.79mm ±1%
    GB/T 9711-2
    ISO 3183-2
    219.1-273.1 ±0.5% ±0.75%
    323.9-355.6 ±1.6mm ±0.75%
    406.4-610 ±1.6mm ±3.0mm


  • Tolerances of Wall Thickness – ERW Steel Pipe
  • Out Diameter Grade Out Diameter Wall Thickness Tolerance
    API 5L / 219.1-457 4-20 +15%, -12.5%
    B 508-610 4-20 +17.5%, -12.5%
    X42-X80 508-610 4-20 +19.5%, -8%
    GB/T 9711-1
    ISO 3183-1
    219.1-457 4-20 +15%, -12.5%
    L245 508-610 4-20 +17.5mm, -10%
    L290-L555 508-610 4-20 +19.5%, -8%
    GB/T 9711-2
    ISO 3183-2
    219.1-610 4-20 +1.0mm, -0.5mm
    219.1-610 10.1-20 +10%, -5%









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