Welded Square Pipe Manufacturer in China

Welded Square Pipe Manufacturer in China
Welded Square Pipe Manufacturer in China
Welded Square Pipe Manufacturer in China
Welded Square Pipe Manufacturer in China
Welded Square Pipe Manufacturer in China
HDT steel
Delivery time
7-15 days
Payment method
Product customization
Sales type of goods
Warehouse stock
Goods settlement method
Settlement by actual weight
Packing method
Wooden case, 20GP / 40GP container
In stock
Welded square tube is a kind of light steel tube with hollow square section, also known as steel cold bending section. It is a square tube made of steel plate or strip steel after crimping and welding. We are a welded square tube manufacturer from China, the company has advanced production technology and perfect after-sales service. The product is in sufficient stock and the price is favorable.

1.What is a welded square pipe?


This photo is of a straight seam welded square tube, its welded seam is a straight line.

Welded square pipe, also known as welded pipe, is a section steel with a square cross-sectional shape made of hot-rolled or cold-rolled strip or coil as the base material, cold-bending, and then high-frequency welding. The welding square tube has a simple production process, high production efficiency, and many varieties and specifications. Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width. Welded square pipes with large diameter or thicker are generally made directly from steel billets, while small welded pipes only need to be welded directly by steel strips, then simply polished and drawn. 

Welded square pipes manufacturers generally conduct directional production and manufacturing according to specifications. If there are special requirements, it can be explained in advance.

2.Welded square pipe parameters

Product namewelded square pipe
Brand NameHDT
Edge width15-600mm
Processing ServiceWelding, Cutting
Payment TermL/C T/T
ApplicationMachinery manufacturing, steel structure engineering

3.Welded square pipe material

Commonly used materials for welded square tubes are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

4.Welding process of welding square pipe

The manufacturer of welded square pipe has technical requirements for square pipe process.

Through the process test and process analysis of the welded square pipe specification, it is determined that the butt weld of the welded square pipe adopts double-layer CO2 gas shielded welding. The welding square tube material is H08Mn2SiA, 1.2mm welding wire, and the protective gas is pure CO2 gas. The welding square tube current of the first layer of welding seam is 200-250A, the second layer is 240-320A, and the arc voltage is 24-26V. The process requirements are: the first layer of welding seam must be penetrated to ensure that the back is well formed. The welding current, arc voltage, wire feeding speed and welding speed of the square tube can be adjusted according to the equipment model.

The narrow blank of welded square pipe can produce the welded pipe with larger pipe diameter, and the blank with the same width can also produce the welded pipe with different pipe diameter. However, compared with the straight seam square pipe with the same length, the weld length increases by 30 ~ 100%, and the production speed is low.

Welded square pipes with large or thick diameter are generally made of steel blank directly, while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing, wire drawing can be used.Therefore, straight seam welding is mostly used for small-diameter welded pipes, while spiral welding is mostly used for large-diameter welded pipes.

Most welded square pipes manufacturers in China will adopt the above process.

5.Welded square pipe application


This photo shows the main application scenarios for welded steel pipes. The welded square pipe has good mechanical properties, good cold and hot workability and low temperature toughness. It is widely used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, highway railings, housing construction and other fields.

6.The difference between seamless square pipe and welded square pipe

1. Different processes: the seamless square tube is a cold-drawn seamless round tube, which is a square tube formed by extruding a seamless tube through the four sides of the die, and has a hollow section; the welded square tube is formed by cold-bending a strip of steel billet. Then it is made of high-frequency welded steel with a square cross-section shape and size.

2. The seamless square tube is stronger than the welded square tube and will not crack.

3. Different uses: the pressure bearing of the welded square tube is not as high as that of the seamless square tube, but the production capacity of the seamless square tube is low, and the production capacity of the welded square tube is high. The square tube is much more expensive. If the pressure requirement is not high, the welded tube is more economical.

7.Calculation formula commonly used by welded square pipe manufacturers

Manufacturers of welded square tubes often encounter various data of square tubes in production. Then you can customize mass production. The following is a commonly used formula.

Formula: 4x side length x wall thickness X7 85 - both side length and wall thickness are in millimeters. Directly substitute the value into the above formula to obtain the weight per meter of square tube in kilograms.

When the wall thickness and side length are in millimeters, 4x wall thickness x (side length wall thickness) calculates the volume of square tube per meter of length, in cubic centimeters, and then multiplies the specific gravity of iron by 7.85g per cubic centimeter to obtain the weight in kilograms per meter of square tube.

About welded square pipe manufacturer

HDT Tubing Co., Ltd is a professional welded square pipe manufacturer, an enterprise of small-diameter cold drawn welded pipe, welded pipe, square pipe, rectangular pipe, low-alloy square pipe and seamless steel pipe. It is a large-scale comprehensive circulation service provider integrating steel trade, warehousing, processing and logistics distribution.

If you are looking for a welded square tubes manufacturer and supplier , then we are your best choice.

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Name: Alex Paulson        time:2022-05-17 12:50:25
The product arrived in perfect condition exactly as described. I am impressed with the quality of the welded square pipe. After some cutting, forming, and otherwise rough handling test, the pipe still looked great. I will make it my first choice in future purchases!

Name: Caleb        time:2022-04-11 14:35:43
The square steel pipe is excellent. The quality is perfectly well. Thank you so much for such great products!

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