Seamless square and rectangular steel tubes

1. Definition and manufacturing process

  1. definition：Seamless square tube is a seamless steel tube with a square cross-section. It is made through a series of complex processing techniques to form a square hollow tube structure without a weld. Compared with seamed square tubes, seamless square tubes have better overall performance, especially in terms of strength and pressure resistance, because they have no welds.

    2. Manufacturing process：

    1. Perforation process：Usually starting from a solid round billet, the billet is first heated to a suitable temperature, generally around 1100 - 1250℃, and then a piercing machine is used for piercing. Common piercing methods include oblique rolling piercing, where the metal in the center of the billet is squeezed out through the synergistic effect of the rolls and the header to form a hollow rough tube.

    2. Tube rolling process：The perforated rough pipe enters the pipe mill for rolling. For seamless square pipes, the pipe mill can use special roll shapes and rolling processes to gradually roll the round rough pipe into a square shape. This process requires precise control of the roll pressure, speed and rolling passes to ensure the dimensional accuracy and shape regularity of the pipe.

    3. Sizing and straightening：After rolling into a square shape, the pipe needs to be sized to ensure that the side length of the square meets the requirements accurately. The seamless square pipe after sizing may produce some bending deformation due to the rolling process, so it is also necessary to straighten the pipe to achieve good straightness.

       1. Performance characteristics

1. Excellent mechanical properties：Seamless square tubes have high strength, and their yield strength and tensile strength depend on the material composition and manufacturing process. For example, seamless square tubes made of carbon structural steel can have a yield strength of more than 235MPa and can withstand greater pressure and tension. In terms of torsion resistance, due to its square cross-sectional structure, it has more advantages than round tubes under certain specific stress conditions.

2. Regular shape and high dimensional accuracy：The square cross-section shape of the seamless square tube is regular, and the side length tolerance can be controlled within a smaller range. For example, the side length accuracy can reach about ±0.5% - ±1%, which enables it to better cooperate with other components during installation and use in the fields of construction, machinery manufacturing, etc., ensuring the stability and accuracy of the structure.

3. Good corrosion resistance：Seamless square tubes can be made of various corrosion-resistant steel materials, such as stainless steel seamless square tubes. At the same time, since there is no weld, the corrosion problem that may occur at the welding part is avoided, and it has a better service life in some environments with high corrosion resistance requirements (such as chemical industry, marine engineering, etc.).

   2. Application Areas

1. Construction industry.

2. Mechanical manufacturing field.

3. auto industry。

1. Bridge main structure support

1. Piers and abutments。

2. Bridge Tower。

2. Bridge span structure application

1. Main beam structure。

2. Beams and longitudinal beams。

3. Connecting and reinforcing components

1. Node Connection。

2. Reinforcement components。

4. Advantages in corrosion resistance and durability

1. Surface treatment and anti-corrosion。

2. Long-term performance advantages.

2. Specifications

1.Q: I have never done business with you before, how can I trust your company?
Answer: Our company has entered Alibaba.com11years, longer than most other suppliers, we have been a gold supplier for many years. What's more, we have a large number of authorization certificates, such asBV，ISO9001，API, Alibaba on-site inspection certificate. I hope the above content can convince you.

2.Q: What is the minimum order quantity?
A: Yes, our company mainly deals in wholesale transactions, but if you insist on buying one piece, or you only need one piece, we will most likely mass produce it for you within the MOQ.

3.Q: How can I get a sample to check your quality? How long can I get the sample?
A: After the price is confirmed, free samples can be provided for your evaluation. After you confirm the sample details, the sample will be3-7days to be ready for delivery and will be sent to you by courier and3-5Arrived within days.

4.Q: What payment methods do you accept?
A: We accept T/T, L/C, Western Union.

5.Q: What are your company's shipping terms and delivery time?
Answer: Bulk20-30Days, Inventory5-10working days

6.Q: Do you have any discounts?
A: We will definitely try our best to help you get these with the best price and good service.