High-frequency welded pipes for efficient industrial applications
Durable high-frequency welded pipes with uniform quality
High-frequency welded pipes ideal for fluid conveyance systems
Precision high-frequency welded pipes for mechanical and structural use

High-Frequency Welded Pipes

High-frequency welded pipes are known for their exceptional uniformity and high production efficiency, making them a popular choice for applications requiring precise manufacturing and reliable performance in industries such as construction and fluid conveyance.

I. Introduction of high frequency welded pipe

High-frequency welded pipe is a kind of welded steel pipe produced by high-frequency welding process.

It heats the edge of the pipe to molten state through the heat generated by high-frequency current, and then completes the welding under pressure.

This welding method has the advantages of fast welding speed, small heat-affected zone, high quality of weld seam, etc., which can effectively improve the production efficiency and reduce the production cost.

II. High-frequency welded pipe application areas

(1) Construction field
Frame, beams and columns
Bridge support
Municipal drainage
Guardrail
High-rise building structures

(2) Energy field
Oil and gas transportation pipeline
Power plant boiler tube
Heat exchanger tubes
Wind power tower
Photovoltaic mounts
Nuclear power equipment

(3) Transportation
Railroad track support
Highway guardrail
Bridge components
Automobile frames
Exhaust pipe
Vehicle structural parts

(4) Mechanical field
Mechanical Structural Components
Conveying pipes
Fluid equipment
Industrial Supports
Mechanical arms
Automation equipment

(5) Agricultural Water Conservancy
Irrigation system
Greenhouse frame
Water piping
Agricultural machinery components
Reservoir water pipelines

(6) Chemical field
Chemical piping
Reactor supports
Conveying tanks
Storage tanks
Structural parts of chemical equipment

(7) Marine Engineering
Offshore platform structure
Submarine Pipelines
Wharf Facilities
Seawater Transportation Pipelines
Marine monitoring equipment

III. High-frequency welded pipe production process
High-Frequency Welded Pipe Manufacturing Process
Process Description
Slitting Wide steel strips are slit into narrow strips of the required width to meet the production needs of different pipe diameters.
Uncoiling The steel strip is uncoiled from the coil axis to provide a continuous strip for subsequent processes.
Strip Leveling The strip is leveled using leveling equipment to eliminate bending and twisting, ensuring the flatness of the steel strip.
Head and Tail Cutting The head and tail of the steel strip are cut to remove parts that do not meet quality requirements.
Butt Welding The cut steel strips are butt-welded end-to-end to form a continuous strip, ensuring the continuity of the production process.
Loop Storage A certain amount of steel strip is stored using a looping device to ensure continuous production during coil change.
Forming The steel strip is formed into a cylindrical shape or other required shapes through forming equipment, preparing for welding.
Welding High-frequency current is used to quickly heat the edges of the steel strip and perform welding using the skin effect and proximity effect.
Burr Removal Internal and external burrs generated during the welding process are removed to ensure the smoothness of the pipe surface.
Calibrating The outer diameter of the pipe is adjusted using a sizing device to ensure dimensional accuracy.
Non-destructive Testing Non-destructive testing techniques, such as eddy current testing or ultrasonic testing, are used to inspect the quality of the welds.
Flying Cutting The pipe is cut to the specified length to ensure the fixed length of the pipe.
Initial Inspection The pipe is subjected to an initial quality inspection, including appearance and dimensions.
Pipe Straightening The pipe is straightened to ensure its straightness.
Pipe End Processing The pipe is further processed according to customer requirements, such as end processing and threading.
Hydrostatic Testing The pipe is subjected to a hydrostatic test to check its sealability and strength.
Non-destructive Testing Non-destructive testing is performed again to ensure the pipe meets quality standards.
Marking and Coating Specifications, production dates, and other information are printed on the pipe surface, and corrosion-resistant coating is applied.
Finished Product The high-frequency welded pipe, after passing inspection, is packaged and stored for shipping.
IV. International Standard for High Frequency Welded Pipe
Standards for High-Frequency Welded Pipes
Standard Number Standard Name Scope of Application Main Content
ISO 9330-3 Technical Delivery Conditions for Welded Steel Tubes for Pressure Purposes - Part 3: Electric Resistance Welded and Induction Welded Non-Alloy and Alloy Steel Tubes with Specified Low-Temperature Properties High-frequency welded pipes for low-temperature environments Specifies low-temperature performance requirements, inspection methods, and delivery conditions
ISO 9330-4 Technical Delivery Conditions for Welded Steel Tubes for Pressure Purposes - Part 4: Submerged Arc Welded Non-Alloy and Alloy Steel Tubes with Specified High-Temperature Properties High-frequency welded pipes for high-temperature environments Specifies high-temperature performance requirements, inspection methods, and delivery conditions
ISO 9330-5 Technical Delivery Conditions for Welded Steel Tubes for Pressure Purposes - Part 5: Submerged Arc Welded Non-Alloy and Alloy Steel Tubes with Specified Low-Temperature Properties High-frequency welded pipes for low-temperature environments Specifies low-temperature performance requirements, inspection methods, and delivery conditions
ISO 9330-6 Technical Delivery Conditions for Welded Steel Tubes for Pressure Purposes - Part 6: Welded Length of Austenitic Stainless Steel Tubes Austenitic stainless steel high-frequency welded pipes Specifies welded length, dimensional tolerances, and inspection methods
ISO 9402 Full-Circumferential Magnetic Flux Leakage Testing of Ferromagnetic Seamless and Welded (Except Submerged Arc Welded) Steel Tubes for the Detection of Longitudinal Defects Non-destructive testing of high-frequency welded pipes Specifies full-circumferential magnetic flux leakage testing methods and acceptance criteria
API 5L Pipeline Steel Tubular Products for Petroleum and Natural Gas Industries High-frequency welded pipes for petroleum and natural gas transportation Specifies requirements for manufacturing, inspection, marking, and packaging of steel pipes
EN 10210 Non-Alloy Steel and Fine-Grain Steel Welded Hollow Sections for Structural Use High-frequency welded pipes for construction and mechanical applications Specifies dimensions, shape, weight, technical requirements, and testing methods
EN 10217 Seamless and Welded (Except Submerged Arc Welded) Steel Tubes for Pressure Purposes High-frequency welded pipes for pressure applications Specifies technical delivery conditions, inspection methods, and acceptance criteria
EN 10219 Cold Formed Rectangular Hollow Sections High-frequency welded pipes for construction and mechanical applications Specifies dimensions, shape, weight, technical requirements, and testing methods
EN 10225 Seamless and Welded (Except Submerged Arc Welded) Steel Tubes for Pressure Purposes High-frequency welded pipes for pressure applications Specifies technical delivery conditions, inspection methods, and acceptance criteria

Description：
ISO 9330 series: These standards specify in detail the technical requirements and delivery conditions of high-frequency welded pipes under different environmental conditions to ensure the applicability and reliability of the products under various working conditions.
API 5L: It is a widely adopted standard in the oil and gas industry, applicable to the manufacture and inspection of high-frequency welded pipes.
EN series standards: cover a wide range of requirements for high-frequency welded pipes in the European market, applicable to construction, machinery, oil and gas and other fields.

V. High Frequency Welded Pipe China Standard
Chinese Standards for High-Frequency Welded Pipes
Standard Number Standard Name Scope of Application Main Content
GB/T 3091-2025 Welded Steel Tubes for Low-Pressure Fluid Conveyance Applicable to welded steel tubes for low-pressure fluid conveyance of water, air, heating steam, and gas Specifies dimensions, shape, weight, technical requirements, testing methods, inspection rules, packaging, marking, and quality certificates
GB/T 13793-2016 Electric Welded Steel Tubes with Longitudinal Seam Applicable to the manufacturing and acceptance of straight seam high-frequency welded tubes Specifies manufacturing process, mechanical performance testing methods, dimensional tolerances, etc.
GB/T 9711.1-2011 Technical Delivery Conditions for Steel Tubes for Oil and Gas Conveyance - Part 1: Grade A Steel Tubes Applicable to high-frequency welded tubes for oil and gas conveyance Specifies requirements for manufacturing, inspection, marking, and packaging
GB/T 5310-2017 Alloy Steel Tubes for Seamless Steel Tubes Applicable to high-frequency pressure welding of high-temperature alloy steel seamless tubes and high-temperature alloy steel composite tubes Specifies manufacturing methods, inspection methods, marking, packaging, transportation, and storage requirements
SY 5038-2000 Technical Specifications for Steel Tubes for City Gas Applicable to high-frequency welded tubes for city gas Specifies requirements for manufacturing, inspection, marking, and packaging
GB/T 14291-2017 High-Frequency Resistance Welded Steel Tubes for Mining Belt Conveyor Belts Applicable to high-frequency resistance welded steel tubes for mining belt conveyor belts Specifies production processes, manufacturing requirements, inspection methods, marking, packaging, transportation, and storage requirements
Q/HFG01-2017 High-Frequency Welded Steel Tubes Applicable to high-frequency straight seam welded steel tubes for general purposes such as furniture manufacturing, railings, greenhouses for flowers and vegetables, architectural decoration, and engineering Specifies dimensions, shape, weight, technical requirements, testing methods, inspection rules, packaging, marking, and quality certificates

Description：
GB/T 3091-2025: applicable to low-pressure fluid transportation, is one of the most commonly used standards for high-frequency welded pipes.
GB/T 13793-2016: specifically for the manufacture and acceptance of straight-seam high-frequency welded pipes, providing detailed technical requirements.
GB/T 9711.1-2011: applicable to high-frequency welded pipes for oil and gas transportation, ensuring the reliability of the products under high-pressure and corrosive environments.
GB/T 5310-2017: applicable to high-frequency pressure welding of high-temperature alloy steel seamless pipes and composite pipes for high-temperature and high-pressure working conditions.
SY 5038-2000: applicable to high-frequency welded pipes for city gas, ensuring the safety of gas transportation.
GB/T 14291-2017: applicable to high-frequency resistance-welded steel pipes for strip steel cloth tube for mining environment.
Q/HFG01-2017: applicable to high-frequency straight-seam welded steel pipes for general purposes, such as furniture, railings, building decoration, etc.

Outer diameter range

6 mm – 820 mm
Wall thickness range

0.5 mm – 16 mm
Length range

3 m – 12 m
Material

Carbon steel, alloy steel, stainless steel.
Welding process

High frequency welding
Surface quality

Smooth surface, beautiful appearance
Non-destructive testing

100% eddy current flaw detection or ultrasonic flaw detection.
Dimensional accuracy

High dimensional accuracy, small tolerance.
Corrosion resistance

Galvanized or anticorrosive coating according to the demand.
Application scope

Used in construction, energy, transportation, machinery, agriculture and many other fields.

Specification

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Model Outer Diameter (mm) Wall Thickness (mm) Length (m) Application
Φ6×0.6 6 0.6 3-12 Low-pressure fluid conveyance
Φ6×0.8 6 0.8 3-12 Low-pressure fluid conveyance
Φ6×1.0 6 1.0 3-12 Low-pressure fluid conveyance
Φ6×1.2 6 1.2 3-12 Low-pressure fluid conveyance
Φ6×1.5 6 1.5 3-12 Low-pressure fluid conveyance
Φ6×2.0 6 2.0 3-12 Low-pressure fluid conveyance
Φ16×0.6 16 0.6 3-12 Low-pressure fluid conveyance
Φ16×0.8 16 0.8 3-12 Low-pressure fluid conveyance
Φ16×1.0 16 1.0 3-12 Low-pressure fluid conveyance
Φ16×1.2 16 1.2 3-12 Low-pressure fluid conveyance
Φ16×1.5 16 1.5 3-12 Low-pressure fluid conveyance
Φ16×2.0 16 2.0 3-12 Low-pressure fluid conveyance
Φ22×0.6 22 0.6 3-12 Low-pressure fluid conveyance
Φ22×0.8 22 0.8 3-12 Low-pressure fluid conveyance
Φ22×1.0 22 1.0 3-12 Low-pressure fluid conveyance
Φ22×1.2 22 1.2 3-12 Low-pressure fluid conveyance
Φ22×1.5 22 1.5 3-12 Low-pressure fluid conveyance
Φ22×2.0 22 2.0 3-12 Low-pressure fluid conveyance
Φ25×0.6 25 0.6 3-12 Low-pressure fluid conveyance
Φ25×0.8 25 0.8 3-12 Low-pressure fluid conveyance
Φ25×1.0 25 1.0 3-12 Low-pressure fluid conveyance
Φ25×1.2 25 1.2 3-12 Low-pressure fluid conveyance
Φ25×1.5 25 1.5 3-12 Low-pressure fluid conveyance
Φ25×2.0 25 2.0 3-12 Low-pressure fluid conveyance
Φ32×0.6 32 0.6 3-12 Low-pressure fluid conveyance
Φ32×0.8 32 0.8 3-12 Low-pressure fluid conveyance
Φ32×1.0 32 1.0 3-12 Low-pressure fluid conveyance
Φ32×1.2 32 1.2 3-12 Low-pressure fluid conveyance
Φ32×1.5 32 1.5 3-12 Low-pressure fluid conveyance
Φ42×0.6 42 0.6 3-12 Low-pressure fluid conveyance
Φ42×0.8 42 0.8 3-12 Low-pressure fluid conveyance
Φ42×1.0 42 1.0 3-12 Low-pressure fluid conveyance
Φ42×1.2 42 1.2 3-12 Low-pressure fluid conveyance
Φ58×0.6 58 0.6 3-12 Low-pressure fluid conveyance
Φ58×0.8 58 0.8 3-12 Low-pressure fluid conveyance
Φ58×1.0 58 1.0 3-12 Low-pressure fluid conveyance
Φ76×0.6 76 0.6 3-12 Low-pressure fluid conveyance
Φ76×0.8 76 0.8 3-12 Low-pressure fluid conveyance
Φ89×0.6 89 0.6 3-12 Low-pressure fluid conveyance
Φ89×0.8 89 0.8 3-12 Low-pressure fluid conveyance
Φ108×0.6 108 0.6 3-12 Low-pressure fluid conveyance
Φ133×0.8 133 0.8 3-12 Low-pressure fluid conveyance
Φ159×1.0 159 1.0 3-12 Low-pressure fluid conveyance
Φ168×1.5 168 1.5 3-12 Low-pressure fluid conveyance
Φ180×2.0 180 2.0 3-12 Low-pressure fluid conveyance
Φ219×4.0 219 4.0 3-12 Low-pressure fluid conveyance
Φ245×6.0 245 6.0 3-12 Low-pressure fluid conveyance
Φ325×8.0 325 8.0 3-12 Low-pressure fluid conveyance
Φ377×10 377 10 3-12 Low-pressure fluid conveyance
Φ426×10 426 10 3-12 Low-pressure fluid conveyance
Φ480×4.0 480 4.0 3-12 Low-pressure fluid conveyance
Φ530×6.0 530 6.0 3-12 Low-pressure fluid conveyance
Φ630×8.0 630 8.0 3-12 Low-pressure fluid conveyance
Φ720×16 720 16 3-12 Low-pressure fluid conveyance
Φ820×8.0 820 8.0 3-12 Low-pressure fluid conveyance
Φ920×4.0 920 4.0 3-12 Low-pressure fluid conveyance

 

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