High-quality ERW carbon steel pipe for industrial applications

Durable ERW carbon steel pipe with excellent welding quality

ERW carbon steel pipe

ERW carbon steel pipe is a high-quality steel pipe made by electric resistance welding, known for its excellent strength and durability, making it ideal for applications in construction, oil and gas industries, and mechanical manufacturing.

Qualified steel pipes will be labeled, specification arranged and put into storage. Before shipment, final inspection and packaging of the steel pipes are also required to ensure safety during transportation.

ERW carbon steel pipe is also known as “resistance welding straight seam welded pipe”, ERW carbon steel straight seam welded pipe is mainly divided into two forms of ERW AC welded steel pipe and ERW DC welded steel pipe.

ERW LSAW pipe is divided into low-frequency welding, medium-frequency welding, super medium-frequency welding and high-frequency welding according to different frequencies. High-frequency welding is mainly used for the production of thin-walled steel pipe or ordinary wall thickness steel pipe, high-frequency welding is divided into contact welding and induction welding.

I. Welded Steel Pipe Classification

Welded steel pipe for industrial use is mainly divided into three categories:

(1) High-frequency resistance welded pipe (ERW): electromagnetic induction technology to achieve metal joining, weld seam formed by the melting of the base material

(2) Straight seam arc welded pipe (LSAW): through the submerged arc welding process longitudinally welded steel plate, suitable for large-diameter, high-pressure pipelines。

(3) Spiral Welded Pipe: Welding steel strip by spiral winding, mostly used for oil and gas long-distance pipelines.

II. ERW carbon steel pipe welding process

ERW (Electric Resistance Welding) adopts the skin effect generated by high-frequency current to make the edge of the steel strip instantly reach the molten state and realize metallurgical bonding under pressure. The process features include:

(1) Base material integrity: the composition of the weld is consistent with the base metal, eliminating the compositional deviation of traditional welding rods.

(2) Geometric seamlessness: Through internal and external burr removal technology, the pipe wall flatness reaches ±0.2mm tolerance.

(3) Physical property optimization: online heat treatment process eliminates welding heat-affected zone and increases strength by 15-20%.

III. International standard certification system

ERW carbon steel pipe has passed many authoritative certifications:

(1) API SPEC 5L/5CT: applicable to X42-X70 steel grade oil and gas transportation

(2) ASTM A53/A500: mandatory certification standards for building structural pipe.

(3) ASME B31.8: special code for city gas pipe network.

(4) EN 10217: EU Pressure Equipment Directive (PED) certification

IV. The use of ERW carbon steel pipe

ERW carbon steel pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction in China.

Liquid transportation: water supply, drainage.

Gas transportation: gas, steam, liquefied petroleum gas.

Structural use: piling pipes, bridges, docks, roads, etc.

V. Expanded application areas of ERW carbon steel pipe

Typical Applications and Technical Specifications

Field	Typical Application	Technical Specifications
Energy Conveyance	Shale Gas Gathering Pipeline	X70 Grade, Φ508mm × 12.7mm
Automotive Manufacturing	Drive Shaft / Chassis Structural Components	SAE1020 Steel, T ≤ 3.5mm
Construction Engineering	Modular Building Framework	ASTM A500 Gr.C, Square Section
Aerospace	Hydraulic System Piping	316L Stainless Steel, Φ38mm × 1.2mm

Outside diameter range	10.3 mm – 610 mm (0.405 inch – 24 inch).
Wall thickness range	1.5 mm – 19.05 mm (0.062 inch – 0.75 inch).
Length range	3 m – 12 m (10 ft – 40 ft).
Material Grade	Carbon Steel (e.g. A53, API 5L GR.B, S235JR, etc.)
Applicable standards	ASTM A53, API 5L, JIS G 3461, EN 10219
Surface treatment	Black, galvanized, anti-corrosion coating.
Connection	Threaded, Welded, Flanged.
Pressure level	according to wall thickness and material, the pressure level ranges from low pressure to medium and high pressure.
Uses	Used in construction, oil and gas, water supply, heating, machinery manufacturing and other fields.
Quality certification	ISO 9001, API certification, etc.

Specification

Specification	Outer diameter range（mm/inch）	Wall thickness range（mm/inch）	Length range（m/ft）	Material Grade	Applicable standards	Surface treatment	Use
ASTM A53 B	10.3-168.3 mm / 0.405-6.625 inch	1.59-16.51 mm / 0.062-0.650 inch	3-12 m / 10-40 ft	Carbon steel	ASTM A53	Black, Galvanized	Water supply, gas supply, structures
API 5L GR.B	10.3-168.3 mm / 0.405-6.625 inch	1.59-16.51 mm / 0.062-0.650 inch	3-12 m / 10-40 ft	Carbon steel	API 5L	Black, Galvanized	Oil and gas transportation
ASTM A252	168.3-610 mm / 6.625-24 inch	3.91-19.05 mm / 0.154-0.750 inch	3-12 m / 10-40 ft	Carbon steel	ASTM A252	Galvanized	Bridges, building structures
EN10219 S235JR	10.3-168.3 mm / 0.405-6.625 inch	1.59-16.51 mm / 0.062-0.650 inch	3-12 m / 10-40 ft	Carbon steel	EN10219	Bare black paint, anti-corrosion coating	Structural use
JIS G 3461 STB340	15.9-139.8 mm	1.5-10 mm	3-12 m	Carbon steel	JIS G 3461		Boilers and heat exchangers
JIS G 3461 STB410	15.9-139.8 mm	1.5-10 mm	3-12 m	Carbon steel	JIS G 3461		Boilers and heat exchangers
JIS G 3461 STB510	15.9-139.8 mm	1.5-10 mm	3-12 m	Carbon steel	JIS G 3461		Boilers and heat exchangers
JIS G 3452 SGP	10.5-508.0 mm	1.5-10 mm	3-12 m	Carbon steel	JIS G 3452	Black pipe (not galvanized), white pipe (galvanized)	Conveying steam, water, oil, gas and air.

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ERW carbon steel pipe

I. Welded Steel Pipe Classification

II. ERW carbon steel pipe welding process

III. International standard certification system

IV. The use of ERW carbon steel pipe

V. Expanded application areas of ERW carbon steel pipe

Specification

Reviews

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