I.Introduction of ERW Black Steel Pipe
ERW black steel pipe, also known as ERW LSAW pipe, is mainly divided into two forms: ERW AC welded steel pipe and ERW DC welded steel pipe.
ERW LSAW pipe is also divided into low frequency welding, medium frequency welding, super medium frequency welding and high frequency welding according to the different frequencies.
II.ERW black steel pipe production process
(1) Preparation of raw materials: choose steel strip and clean the surface.
(2) Unwinding and molding: After uncoiling, the steel strip is gradually bent into a round pipe shape by the molding machine.
(3)Welding: High-frequency current welds the edges of the billet to form a weld.
(4)Welding Seam Inspection: Non-destructive testing technology is used to check the quality of the weld seam.
(5)Cooling: The welded steel pipe is water-cooled or air-cooled.
(6)Sizing: steel pipe is sized by sizing machine.
(7) Cutting: Cut the steel pipe to the specified length according to the requirements.
(8) Inspection and Packing: Packing and storage after passing the comprehensive inspection.
III.American Standard for ERW Black Steel Pipe
| Item | Requirements |
|---|---|
| Scope of Application | Applicable to mechanical and pressure applications, such as steam, water, gas, and air pipelines. |
| Manufacturing Process | Adopt the electric resistance welding (ERW) process, and the weld seam needs to be heat-treated. |
| Chemical Composition (Maximum Percentage) | C-0.30%, Mn-1.20%, P-0.035%, S-0.035%. |
| Mechanical Properties (Minimum Values) | Yield strength 240 N/mm², tensile strength 415 N/mm², elongation 25%-30%. |
| Size Range | Outer diameter: 1/2"-24"; Wall thickness: 1.65-20mm; Length: 3-12m. |
| Dimensional Tolerance | The outer diameter variation does not exceed ±1% of the nominal outer diameter; the wall thickness tolerance is ±10%. |
| Testing Requirements | Hydrostatic test pressure: For NPS 3 inches and below, not exceeding 2500 psi; for NPS 3 inches and above, not exceeding 2800 psi, with a holding time of at least 5 seconds; Non-destructive electric testing (NDE). |
| Surface Treatment | Black paint coating. |
| End Treatment | Plain end. |
| Packaging and Marking | Packaged and marked online according to standards and customer requirements. |
IV.ERW (resistance welding) black steel pipe main advantages include:
(1) High strength and reliability: high strength of weld seam and uniform mechanical properties.
(2) High dimensional accuracy: precise control of size and roundness.
(3) High production efficiency: high degree of automation, fast molding and welding.
(4)Cost-effectiveness: high utilization of raw materials, low production cost.
(5)Environmental protection and sustainability: low energy consumption, recyclable materials.
(6)Wide range of application: a variety of specifications, applicable to a variety of industries.
(7)Good surface quality: smooth surface, strong coating adhesion.
(8)Quality consistency: strict quality control, product standardization.
V . ERW black steel pipe has a wide range of uses, mainly including:
(1) Oil and gas industry: used for transportation of oil, natural gas and other fluids.
(2) Construction field: used as structural material for building frames, supports, etc.
(3) Mechanical manufacturing: used for manufacturing mechanical parts, equipment frames, etc.
(4) Chemical industry: used to convey chemicals, corrosive media, etc.
(5) Municipal engineering: used for water supply and drainage pipes, gas pipes, etc.
(6) Automobile manufacturing: used for automobile parts, exhaust systems, etc.
(7) Marine engineering: used for marine platforms, submarine pipelines, etc.
(8) Other fields: such as agricultural irrigation, power transmission, etc.
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