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Welded Steel Pipe

Yuantai Derun is large ERW/LSAW/SSAW steel pipe manufacturer in China

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welded steel pipe

Welded steel pipe detail

Shape:square,rectangular,round,shaped
Size:
φ：10.3-3620mm 
W.T.: 0.5-60mm for round steel pipe
O.D.:10×10-1200×1200mm 
W.T.:0.5-60mm for square carbon steel pipes
O.D.:10×15-800×1200mm W.T.:0.5-60mm for rectangular carbon steel pipes
For shaped tube, customize the outer diameter and wall thickness
Length:custmized
Grade：Gr.A/B/C,S235/275/355/420/460,A36,SS400,Q195/235/355,STKR400/490,300W/350W
Standard：ASTM A500/A501/A53/A106,EN10219/10210,JIS G3466,GB/T6728/3094/9711 AS1163, CSA G40.20/G40.21
Surface Treatment：Bare,oil,painted,galvanized,etc.
MOQ:2-5Tons
Capacity:10 million tons per year
Packaging:Oil coated and PVC cloth
Port of origin:Tianjin Port
Payment：TT/LC,etc

Welded Steel Tube

Types Of Welded Steel Pipe

Square Steel Pipe
Square Steel Pipe

Experience Yuantai Derun's Black Square Steel Hollow Section- Unparalleled Quality

Rectangular Steel Pipe
Rectangular Steel Pipe

Experience Yuantai Derun's Black Rectangular Hollow Section- Unparalleled Quality

ERW Round Steel Pipe
Round ERW Steel Pipe

Experience Yuantai Derun's Black Circular Hollow Section- Unparalleled Quality

Shape Tube
Shape Tube

Experience Yuantai Derun's shape tube- Unparalleled Quality

Welding Galvanized Steel Pipe
Welding Galvanized Steel Pipe

Experience Yuantai Derun's Galvanized Steel Hollow Section- Unparalleled Quality

Zinc aluminium magnesium coating steel pipe
Zinc aluminium magnesium coating steel pipe

Experience Yuantai Derun's Zinc aluminium magnesium coating steel pipe- Unparalleled Quality

spiral welded steel pipe
spiral welded steel pipe

Experience Yuantai Derun's Steel coil- Unparalleled Quality

LSAW steel pipe
LSAW steel pipe

Experience Yuantai Derun's LSAW steel pipe- Unparalleled Quality

Top 500 enterprise
China Top 500 Enterprises Industry
Capacity of manufacturing
22 years manufacturing experiences
Yuantai Derun honor
80 R&D patent technologies
steel tubes
200000 tons of spot inventory
22+ Years Of

Industry experience

Quality welded steel tube manufacturers

Yuantai Derun was the largest structural steel welded pipe suppliers

Our main welded steel pipe products include ERW steel pipe, LSAW steel pipe,spiral welded steel pipe. What’s more, we have various kinds of steel pipes which are professional for building structural use and Transport usage. We believe there will always be one for you.

  • steel pipe factory

    22 years

    Start a business for over 22 years.

  • Price

    Price

    Quality guaranteed and reasonable price.

  • Employee

    7%

    Employee turnover rate is less than 7%, specialization and working state are proportional.

  • Efficient-1

    Efficient

    Highefficientservice for communicationand shipment.

Advantage Of Welded Steel Pipes

welded steel tubes

Welded Steel Pipes Benifit

The welding process for welded steel pipes utilises advanced technology and materials, resulting in high efficiency and low energy consumption. This leads to significant cost and energy savings compared to traditional pipes. Additionally, welded steel pipes can be customised in terms of specification and length, making them more convenient for transportation and installation.

Welded steel pipe has a thicker wall, providing higher strength and stiffness. This allows it to withstand greater pressure and impact. Additionally, due to its excellent mechanical properties, welded steel pipe is suitable for use in various complex terrains and environments, such as mountainous areas, rivers, and bridges.

Welded steel pipe has enhanced corrosion resistance. It can operate stably for extended periods in acidic, alkaline, salty, and other corrosive media, ensuring pipeline safety and longevity.

Application Of Welded Steel Pipes

Welded Pipes For Water Supply

The integration of urban and rural water supply mainly refers to the extension of the water supply pipeline network from the city to the townships, the establishment of an integrated urban and rural water supply network system, and the basic realisation of urban and rural networked water supply and the sharing of water resources. 


Welded pipes play a very important role in the integration of urban and rural water supply.

welded pipe for structural use

Welded Pipes For structural use

Structural welded steel pipe is used in steel structure, bridge support, building structure pipe, pile foundation pipe, etc. As the structural pipe needs great pressure bearing and pressure resistance, it generally adopts the wall thickness more than 8mm.The main material of structural pipe is carbon steel.

Yuantai Derun welded pipe, sufficient stock, rich variety, complete specifications, free samples, complete materials, excellent quality，contact us now!

Welded Pipe for Oil Transportation

Welded Pipe for Oil Transportation

Pipelines are an important means of transporting oil. Oil transport, one of the components of fossil energy transport. Including crude oil transport and refined oil products transport two parts. 

As of 2018, the total length of oil and gas pipelines in the world exceeds 2.4 million km, of which more than 50% is in the United States and Russia. Welded pipe for oil transportation is an important pipe product for oil transportation.

If you have any welded pipe for oil,please contact us now,sales@ytdrgg.com.


Manufacturing Process


At present, carbon steel pipes can be divided into several categories according to the forming process, namely ERW steel pipes, LSAW steel pipes, SSAW steel pipes, and seamless steel pipes. Seamless steel pipes are further divided into hot extruded seamless steel pipes and cold drawn seamless steel pipes.
 
The main steps of the production process for ERW steel pipes are: uncoiling, straightening, forming, high-frequency resistance welding, removing welds, water cooling, sizing, cutting, testing, and warehousing.

The main steps in the production process of LSAW steel pipes are: steel plate inspection - trimming - pre bending - forging and cold forming - pre welding - internal and external welding - sizing - chamfering - UT inspection - water pressure inspection - appearance inspection - spray marking storage

The main steps in the production process of SSAW steel pipes are: uncoiling, cutting, butt welding, straightening, spiral forming, double-sided submerged arc welding, cutting, ultrasonic testing, water pressure testing, appearance testing, spray marking and storage.

Yuantai Derun Hot Dip Galvanised Welded Tube Manufacturing Process: Black Welded Tube → Alkali Washing →Water Washing →Pickling →Water Rinsing →Dipping Additives →Drying →Hot Dip Galvanising →External Blowing →Internal Blowing →Air Cooled →Water Cooled →Passivation →Water Rinsing →Inspection →Weighing →Storage.


① The main production processes (main inspection processes) of Pre galvanized welded steel pipes:

Galvanized steel coil→ uncoiling →Shear Butt Welding → straighten → Roll forming → High frequency welding→ weld seam removal → sizing →cutting→ inspection (non-destructive, physical and chemical, bench inspection) → storage


② The main production processes of Zinc-aluminium-magnesium coated steel tubes

Zinc-aluminium-magnesium coated steel coil → uncoiling →Shear Butt Welding → straighten → Roll forming → High frequency welding→ weld seam removal → sizing →cutting→ inspection (non-destructive, physical and chemical, bench inspection) → storage

  • Product Manual

  • round steel pipe specification chart

    May 9,2024

  • ERW Steel Pipe Specification Chart

    Mar 18,2024

  • LSAW Steel Pipe Specification Chart

    Mar 18,2024

  • SSAW Pipe Specification Chart

    Mar 18,2024

  • Pre galvanized round welded steel pipe specification

    Mar 28,2024

  • Pre galvanized square welded steel pipe specification

    Mar 28,2024

  • Pre galvanized rectangular welded steel pipe specification

    Mar 28,2024

  • Yuantai Derun Company File

    Mar 18,2024

  • Project Case

    Mar 18,2024

Related Products

  • What Are The Tips For Welding Square Tubing
    1. Welded square tubes can be welded in a conventional manner, 45 degrees requires one lap weld, one fillet weld and two plane welds.
    2. No preparation is required prior to the fillet and lap weld positions, only the removal of rust, dirt or debris from the weld area.
    3. Before performing two plane welds, the metal needs to be cleaned and bevelled to ensure weld penetration.
    4. When cutting square tubing, make sure each piece has a 45-degree angled end, using a band saw set for a degree miter cut.
    5. After cutting use a sander to remove burrs and bevel the edges of the cut 45 degree angles.
    6. Place the square tube in the work area with the miter cuts facing each other, leaving a 1/16" gap, and use a straightedge to make sure the angle is 90 degrees.
    7.Before switching on the welding machine, ensure that all welding equipment is worn. Apply spot welds to the inside corners first, continually checking with a right angle ruler to ensure the angle is correct, then apply spot welds to the faces and 45 degree miter cuts.
    8. After completing the spot welds, weld the back corners of the square tube starting at the top and working downwards, then flip the tube over and weld the other side.
    9. Apply flat welds to the 45-degree miter cuts, welding from the inside corner to the outside corner.
    10.After all the welding is done, grind the corners to get perfect 90 degree square tube corners.
    Mar 28,2024
  • Can you weld galvanized pipe?
    Yes，I Can.Galvanised steel pipes are very weldable and 2 galvanised pipes can be brought in for welding.
    Mar 28,2024
  • What is the difference between welded and threaded pipes?
    Welded joints are generally stronger than other jointing methods. In situations where lateral forces are present, such as tidal currents or wave actions, threaded joints may be weaker. It is best to use 'continuously welded' pipe.
    Welded pipes and threaded pipes are two common types of metal pipes. The main differences between them lie in manufacturing process, connection method, application scenarios and performance characteristics.
    Welded pipes
    threaded pipes
    Manufacturing process
    Welded pipes
    Definition Pipes that are formed by curling steel plates or steel strips and connecting seams through welding processes.
    Manufacturing process 1. Roll the steel plate into a cylindrical shape;
    2. High frequency electric resistance welding (ERW), submerged arc welding (SAW) or laser welding the seam;
    3. Cooling, sizing and cutting.
    Threaded Pipe
    Pipes with threads processed on the pipe ends or pipe body through cutting, rolling and other processes.
    1. The pipe is directly cast or welded;
    2. The pipe end is threaded or rolled;
    3. Surface treatment such as galvanizing may be performed.
    2. Comparison of main features
    Welded pipe
    Seam type There is a longitudinal weld (straight seam weld) or a spiral weld (spiral welded pipe).
    Connection method Usually connected by welding, flange or clamp.
    Strength There may be weak points in the weld area, and the overall strength depends on the quality of the weld.
    Sealing: Good sealing after welding, suitable for high pressure system.
    Cost: High material utilization, suitable for mass production, and low cost.
    Threaded pipe
    No joints or only welded joints, but the pipe ends are threaded.
    Tightly connected to other pipe fittings through threads (such as NPT, BSPT standards).
    The strength of the threaded connection is low, and it is necessary to avoid over-tightening to cause thread damage.
    Sealing tape or gasket is required, otherwise it is easy to leak.
    Thread processing increases costs and is suitable for small batches or special needs.
    3. Application Scenarios
    Welded pipes
    1. Fluid transportation (water, oil, gas);
    2. Structural support (buildings, bridges);
    3. Machinery manufacturing (equipment frame).
    - Oil and gas pipelines;
    - Building scaffolding steel pipes;
    - Automobile exhaust pipes.
    Threaded pipes
    1. Pipe systems that require frequent disassembly;
    2. Low-pressure fluid delivery;
    3. Small equipment or household pipes.
    - Household galvanized water pipes (threaded connection);
    - Fire hydrant interface;
    - Hydraulic system detachable pipes.
    Mar 27,2025
  • What are the classification of welded pipes?
    (1) By process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe. (2) According to the weld seam - straight seam welded pipe, spiral seam welded pipe.
    Welded pipes (welded steel pipes) can be classified according to manufacturing process, weld form, use, material, shape and other dimensions
    Classification by manufacturing process
    High frequency electric resistance welded pipe (ERW)



    Submerged arc welded pipe (SAW)





    Laser welded pipe





    Gas welding pipe
    Process description
    Use high-frequency current to heat the edge of the steel plate and weld it into a pipe through pressure


    Using submerged arc welding technology, the weld is covered with flux, divided into straight seam (LSAW) and spiral welding (SSAW).


    Use high-energy laser beam welding, high precision, small heat-affected zone.



    Heating and welding by oxy-acetylene flame (traditional process, less used now).
    Features and applications
    - Smooth welds and high production efficiency;
    - Used for water pipes, gas pipes, and structural pipes (such as scaffolding).
    - Deep weld and high strength;
    - Suitable for large-diameter high-pressure pipelines (such as oil and natural gas pipelines).


    - Narrow weld seam and good surface quality;
    - Used for precision machinery, automobile exhaust pipes, etc.

    - Low cost, but unstable weld quality;
    - More common in small workshops or maintenance scenarios.
    2. Classification by weld form
    II. Classification by weld form
    Straight welded pipe The weld is a straight line, the process is simple, and the production efficiency is high.
    Spiral welded pipe The weld is spiral, which can produce large diameter pipes with uniform overall strength.
    Seamless welded pipe The difference between the weld and the base material is eliminated through heat treatment, and the performance is close to that of seamless pipe.
    Mar 31,2025
  • What is the difference between seamless pipe and welded pipe?
    The most essential difference between seamless steel pipe and welded steel pipe is the weld seam . The body of seamless pipe has no weld seam, and the body of welded pipe is usually welded.
    Seamless pipes refer to steel pipes without joints, which are steel pipes without joints that are rolled by piercing the center of round bars.

    Welded pipe is a steel pipe with a weld seam. The steel plate is rolled into a cylindrical shape and welded, and then drawn and other processes are used to make a steel pipe with an inconspicuous weld seam.
    Seamless pipe
    Welded pipe
    Seamless steel pipe: smooth surface, no welds, good integrity, beautiful appearance.
    Welded pipe: Since it is made by welding, the weld can be clearly seen on its surface. However, with the advancement of technology, some welded steel pipes will be welded to make the weld less obvious.
    Performance characteristics
    Seamless steel pipe: Since there is no weld, its pressure bearing capacity is usually high, suitable for harsh environments such as high pressure and high temperature. At the same time, the precision and finish of seamless steel pipes are relatively high, suitable for occasions with high requirements for steel pipe performance.
    Welded pipe: Although the pressure bearing capacity is lower than that of seamless steel pipes, the cost is low and it is easy to process and install.
    Seamless steel pipe: Due to the complex manufacturing process and superior performance, its price is usually higher than that of welded steel pipe. However, the specific price will also be affected by factors such as market supply and demand, raw material price fluctuations, etc.
    Welded pipe: Low cost, suitable for large-scale, low-cost application scenarios.
    Uses
    Seamless steel pipe
    Seamless steel pipe is mainly used for petroleum geological drilling pipe, petrochemical cracking pipe, boiler pipe, bearing pipe and high-precision structural steel pipe for automobile, tractor and aviation. In addition, it is also widely used in the fields of petroleum, chemical, electric power, nuclear energy, etc., especially in the occasions where it needs to withstand harsh environments such as high pressure, high temperature and corrosion.
    Seamless steel pipe is also commonly used to manufacture structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Because of its hollow cross-section, it is widely used as a pipeline for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials.
    Welded pipe
    Welded pipe is widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction and other fields. In the field of construction, welded pipe is often used in steel structure frames, supports and guardrails; in the field of pipeline transportation, welded pipe is used to convey fluid media such as water, gas, oil, etc.
    Welded pipe is also used in machinery manufacturing, automobile manufacturing, railways and aerospace. In these fields, welded pipes are widely used due to their high strength, good toughness, corrosion resistance and easy processing.
    Mar 27,2025
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Yuantai team has over 21 years of experience in steel pipe project applications, specializing in the production, manufacturing, and customization of square rectangular, and circular steel pipes. Warmly welcome project procurement managers, individual owners, designers, and overall sellers, etc. Write down your requirements and receive professional quotes and technical support.
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