Black Welded Steel Pipe ASTM A53 ERW for Oil & Gas Alloy Piping
Product Overview
Black welded steel pipe manufactured to ASTM A53 standard using ERW (Electric Resistance Welding) technology – engineered for oil, gas, and alloy piping applications. Combining high strength, superior dimensional accuracy, and excellent weldability, this product is the preferred choice for petroleum and natural gas transmission, structural supports, and medium-to-low pressure fluid systems.
Specifications & Material Grades
Standard: ASTM A53, API 5L PSL1/PSL2
Material Grades: Gr.A, Gr.B; also available in API 5L X42 – X70 high-grade variants
Certifications: API, ISO 9001, SGS, BV, and third-party inspection reports
Manufacturing Advantages
Produced via high-frequency Electric Resistance Welding (HF-ERW), the steel strip is roll-formed into a cylindrical shape and welded longitudinally using electrical resistance heating – without filler metal. The resulting weld seam is narrow and clean, with mechanical properties approaching those of the base material. Compared with seamless alternatives, ERW pipe offers:
Uniform wall thickness and tight dimensional tolerances – excellent roundness for easy field welding and threading
Cost efficiency and fast delivery – high-volume production capability with short lead times
Reliable weld integrity – verified by in-line NDT (UT/ET) and hydrostatic testing
Size Range
| Parameter | Specification |
|---|---|
| Outside Diameter | 16mm – 660mm |
| Length | 6m / 12m or custom-cut to requirements |
| Pipe Ends | Plain / Beveled / Threaded / Grooved |
Surface Finishes
Standard supply is black bare pipe (coated with anti-rust varnish or oil). Optional finishes include:
◆ Hot-dip Galvanized
◆ 3PE / 3PP / FBE Fusion Bonded Epoxy coating
◆ Bitumen Coating
Key Applications
Oil & Gas: Gathering lines, flow lines, casing and tubing
Petrochemical & Chemical: Medium-to-low pressure process piping, boiler tubes
Infrastructure & Construction: Water transmission, fire protection systems, structural piles and columns
Machinery Manufacturing: Hydraulic cylinders and general mechanical tubing
Quality Assurance
Every batch undergoes rigorous mechanical and chemical testing, including: chemical composition analysis, tensile/yield strength testing, flattening and bending tests, hydrostatic pressure testing, and nondestructive inspection (UT/ET) – ensuring full compliance with ASTM A53 requirements.
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