Electric Resistance Welded Pipes
what is ERW pipe
ERW steel pipe is a longitudinal welded steel pipe manufactured by high-frequency resistance welding. After the steel strip is rolled into a tube, the skin effect and proximity effect generated by high-frequency current are used to heat the edge of the pipe to a molten state, and the weld is formed by extrusion roller crimping. This product has the characteristics of small welding heat affected zone, high forming accuracy, and high production efficiency. The welding speed can reach 20-200 meters/minute. It is suitable for the manufacture of pipes with an outer diameter of less than 660mm and a wall thickness of 6-36mm. ERW welded pipes are mainly used in the fields of oil and gas transportation, building structure support, and urban pipeline network construction.
Production process
The continuous roller forming process is adopted, including 16 processes such as longitudinal shearing, strip leveling, and high-frequency welding. The core equipment includes a solid-state high-frequency welder, which can complete molten extrusion welding when the tube billet is moving at high speed (up to 200 meters/minute). The weld guide device can ensure the welding accuracy of large-diameter pipes, and adapt to the production of pipes of different specifications by adjusting the guide wheel spacing.
Technical characteristics
Thin-walled steel pipes can be welded, with a minimum wall thickness of 6mm, and no filler material is required during the welding process
The weld strength can reach more than 95% of the parent material, and the width of the heat-affected zone does not exceed 2mm
Equipped with online flaw detection equipment, the weld quality can be detected in real time
According to application requirements, the internal burr cleaning process can be selected, and the residual height is ≤0.5mm
Specifications
The mainstream products cover specifications of φ219mm-φ630mm, and the production capacity is most concentrated in the range of wall thickness 6-22mm. The material selection involves multiple steel grades such as carbon steel (Q235B), low alloy steel (Q345B) and pipeline steel (X70/X80). The length of pipes for building structures is usually 6-12 meters, and the pipes for petrochemicals comply with API 5L standards.
Application fields
- Energy transportation field: widely used in long-distance oil and gas pipelines, steel pipes above X70 grade can withstand high-pressure transportation. In the construction of urban gas pipelines, products with specifications of φ89mm-φ660mm occupy the mainstream application.
- Construction engineering field: When used as a pile driving pipe, the single pile bearing capacity of a 508mm diameter product can reach 2000kN. In steel structure buildings, square and rectangular welded steel pipes (maximum 800×800×40mm) are used for the truss support system of the venue.
- Municipal engineering field: Epoxy powder anti-corrosion coated steel pipes are used in the construction of thermal pipe networks. The outer diameter of the acoustic detection pipe product covers 38-56mm specifications, and is used for supporting pile foundation detection.
Quality Control
The production process is subject to triple quality control, including online eddy current testing, ultrasonic flaw detection and water pressure testing. According to standard requirements, tensile tests, impact tests and flattening tests are required. Welding process assessment covers technical indicators such as pipe diameter ±1% ovality control and weld excess height ≤3mm.
ERW Pipe specification
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Products
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ERW steel pipe
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Material
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Q195 = S195 / A53 Grade A
Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2 Q355 = S355JR / A500 Grade B Grade C |
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Surface Treatment
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1. Galvanized
2. Black and color painting 3. Transparent oil,anti-rust oil 4. According to clients requirement |
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Alloy Or Not
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Non-Alloy
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Size
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DN15-600mm
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Thickness
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2- 20 mm(accroding to the buyer's request)
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Length
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12m, 6m, 1-12m(accroding to the buyer's request)
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Standard
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ASTM A53, API 5L, ASTM A252, ASTM A795, ISO65, DIN2440, BS1387. BS1139, EN10255, EN39, JIS3444, GB/T 3091 & GB/T13793
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Certificate
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API, CE, BSI, JIS
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Pipe Ends
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Bevelled or plain ends.
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End Protection
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With or Without caps(accroding to the buyer's request)
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Packing
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Packed in bundles with nylon slings or piece by piece
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Application
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1.low pressure such as water, gas, alr, oil and steam and for machine structural purposes
2. Fence, greenhouse, door pipe 3. For both indoor and outdoor the building construction |
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Brand
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GNEE
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Place Of Origin
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Tianjin, China
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Trade Terms:
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FOB/ CIF/ CFR / FCA / EXW
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Delivery Time:
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15-45 days (based on quantity) after receiving advanced payment by T/T or LC .
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Payment Terms:
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T/T or L/C
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Main Market:
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Southeast Asia, South Asia, Middle East, Middle&South Americ, Africa and Oceania
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electric resistance welding pipe in stock
Inspection of ERW pipe
Test:
Chemical Analysis, Mechanical Test, Visusal Inspection , Tension Test, Dimension Check, Bend Test , Flattenting Test, Impact Test, DWT Test, NDT Test, Hydrostatic Test, Hardness Test...
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