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

Product Specifications

Product Name: ERW Steel Pipes、Electric Welded Pipes、ERW Welded Pipes

OD: Φ10mm – Φ660mm

WT: 0.6mm – 22mm

Length: 2m – 18m

Material: Q195, Q215, Q235, Q345, 20#, 45#, ASTM A36, A53 Gr.A/B, A500 Gr.B/C, S235JR, S275JR, S355JR

Standard: GB/T 13793、GB/T 3091、API 5L、ASTM A53 / A252 / A500、EN 10217 / EN 10219、JIS G3444

Application: High-frequency welded pipes are widely used in low- and medium-pressure fluid transportation, building structures, mechanical manufacturing, and other fields.

I. Introduction to High-Frequency Welded Pipes

This is a type of welded steel pipe manufactured using high-frequency welding technology.
i. Working Principle
High-frequency current generates concentrated heat, instantly heating the edges of the pipe material to a molten state. The weld is then completed under pressure.
ii. Core Advantages
This welding method is extremely fast. Its heat-affected zone is very small. The weld quality is typically very high.
iii. Applications and Efficiency
These advantages significantly enhance production efficiency. At the same time, they effectively reduce production costs. ERW LSAW pipes (resistance welded pipes) widely adopt this process.
iv. Material Applicability
This process is not only suitable for carbon steel but can also be used to produce welded stainless steel pipes. This expands its application range.

II. High-frequency welded pipe application areas

High-frequency welded pipes (ERW steel pipe) play a key role in many industrial fields due to their high production efficiency, cost-effectiveness, and reliable performance. Their main applications include:

i. Construction and infrastructure construction

Building structures: Widely used in frameworks, beams, columns, bridge supports, and components of high-rise buildings. Among these, ERW carbon steel pipes, with their excellent strength and cost advantages, are the primary choice for building structures.
Municipal engineering: Commonly used in drainage pipes, guardrails, and other facilities.

ii. Energy transmission and equipment manufacturing

Oil and gas transmission: An economical and efficient solution for oil and natural gas transmission pipelines.
Power Equipment: Applied in boiler tubes for power plants, heat exchanger tubes, wind turbine towers, photovoltaic mounting structures, and auxiliary structures for nuclear power equipment. In core components subjected to extremely high pressure or harsh conditions, carbon steel seamless pipes may be required.

iii. Transportation and Mechanical Equipment

Transportation Infrastructure: Used in railway track supports, highway guardrails, bridge components, vehicle frames, exhaust pipes, and various vehicle structural parts.
Industrial machinery: Used as base materials for mechanical structural components, conveying pipelines, fluid equipment, industrial support frames, robotic arms, and automated equipment frames.

iv. Agricultural and Water Conservancy Engineering

Irrigation and Water Supply: Commonly used materials for irrigation systems, greenhouse frames, water supply pipelines, agricultural machinery components, and reservoir water conveyance pipelines.

v. Chemical and Marine Engineering

Chemical Equipment: Used in the manufacture of chemical process pipelines, reactor supports, conveying tanks, storage tanks, and equipment structural components.
Marine Facilities: High-frequency welded pipes are used in the construction of offshore platform structures, subsea pipelines, port facilities, seawater conveyance pipelines, and marine monitoring equipment support structures, with high requirements for corrosion resistance.

III. High-frequency welded pipe production process

The production of high-frequency welded pipes (an important type of welded steel pipe) is a highly automated continuous process, differing from the production line layout of spiral welded pipes. Its core lies in utilizing high-frequency current to achieve rapid and efficient welding. The following are its typical process steps:

i. Raw material preparation and processing:

Slitting: Wide steel strips are precisely cut into narrow strips of the required width, forming the foundation for producing pipes of different diameters.
Uncoiling: Steel coils are unrolled to form a continuous strip supply.
Strip flattening: Flattening equipment is used to eliminate any bending or twisting in the steel strip, ensuring its flatness, which is critical for subsequent forming and welding quality.
End Trimming: Defective sections at the ends of the steel strip are removed.
Butt Welding: The ends of the front and rear coils are welded together to form an ultra-long continuous strip, ensuring uninterrupted production.

ii. Forming and Welding:

Ring Storage (Loop): Stores a certain length of strip material to buffer the impact of coil changes or butt welding on subsequent processes, ensuring continuous material supply.
Forming: The continuous strip material is gradually bent into a circular shape (or other required cross-sectional shape) through a series of carefully designed forming rolls. This process is continuous, unlike the piercing or extrusion forming used in seamless steel pipes.
High-Frequency Welding: This is the core process. The two edges of the formed tube are fed into a high-frequency welding device. Utilizing the “skin effect” and “proximity effect” of high-frequency current, the edges are instantly heated to a molten state, and under the pressure of the squeezing rolls, a secure weld is formed, creating an electric resistance welded (ERW) pipe. The welding speed is extremely fast, with a minimal heat-affected zone.

iii. Post-welding treatment and finishing:

Deburring: Immediately remove excess metal (burrs) formed on the inner and outer surfaces of the weld due to extrusion, ensuring a smooth inner wall and flat outer surface of the pipe.
Calibration (sizing): Use a set of precision sizing rolls to precisely control the outer diameter and roundness of the pipe, meeting standard dimensional requirements.
Flying Cut: Cut the continuously running pipe into fixed lengths specified by the customer.
Pipe Straightening: Straighten the cut pipe sections to ensure their straightness meets requirements.
Non-Destructive Testing (Initial Inspection): Typically, the first non-destructive testing (such as eddy current or ultrasonic testing) is conducted at this stage, focusing on inspecting the continuity and internal quality of the welds.

iv. Final Inspection and Protection:

Pipe End Processing: Process the pipe ends according to customer requirements, such as chamfering or threading.
Hydrostatic Testing: Conduct pressure testing on the pipe segments to verify their pressure-bearing capacity and密封性, ensuring safe use.
Non-Destructive Testing (Final Inspection): Conduct a comprehensive final non-destructive test to ensure the entire pipe (including the base material and welds) meets quality standards. The testing standards are typically similar to those for high-quality pipes such as structural seamless pipes.
Marking and Coating: Clearly mark specifications, material type, standards, production batch numbers, and other information on the pipe body. Apply anti-rust oil or corrosion-resistant coatings (e.g., galvanization) according to application requirements and customer specifications.
Finished Product: High-frequency welded pipes that have passed strict inspections are packaged and stored in the warehouse, ready for shipment to various application fields such as building structures, mechanical manufacturing, and fluid conveyance.

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

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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