Seamless square and rectangular tube

What is seamless square and rectangular tube?

Seamless square and rectangular tube is a square tube with four corners. It is a square tube or rectangular tube formed by cold drawing or extrusion of seamless steel tube. Seamless square rectangular tube is a rectangular parallelepiped with a hollow cross-section and no seams around it. Tube.

What material are square tubes generally made of?
The material of square tubes is generally carbon steel square tubes and low alloy square tubes. Common carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.; low alloy steel is divided into Q345, 16Mn, Q390, ST52-3, etc. Common American standards include EN 10210, EN 10219, ASTM A500.

Forming process: Most square and rectangular steel pipes are unpacked, flattened, curled, and welded to form round pipes, which are then rolled into square pipes and then cut to the required length.

Square tube sizes:

Square or rectangular tubes are steel pipes characterized by square or rectangular cross-sections. The measurement method of their external dimensions usually refers to the outer diameter of the pipe. The specific square tube size range is as follows:
1. Square tube outer diameter size range: 10×10mm-600×600mm;
2. Rectangular tube outer diameter size range: 10×20mm-600×400mm.
These size ranges are clearly specified in national standards, and special specifications of square and rectangular tubes can also be produced according to customer requirements.

Classification of square and rectangular tubes:

a. According to the production process, square and rectangular tubes are divided into: hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, and welded square and rectangular tubes.

b. Among them, welded square pipes are divided into:
1. According to the process - arc welding square tube, resistance welding square tube (high frequency, low frequency), gas welding square tube, furnace welding square tube
2. According to the welding seam - straight seam welded square pipe, spiral welded square pipe

c. Square tubes are classified according to cross-sectional shape:
1. Simple cross-section square tube - square square tube, rectangular square tube
2. Complex cross-section square tubes - flower-shaped square tubes, open-shaped square tubes, corrugated square tubes, special-shaped square tubes

What is the difference between seamless square tube and welded square tube?

Seamless square tubes are formed by cold drawing of seamless round tubes, while welded square tubes are formed by strip welding. This is a difference in process.
Secondly, the price of seamless square tubes is much higher. Due to the quantity limit of many non-standard specifications of welded square pipes, seamless delivery is faster.

Performance characteristics of square tube:

1. Seamless square tube is made by extruding seamless round tube. The plasticity of square tubes refers to the ability of metal materials to produce plastic deformation (persistent deformation) without destruction under load. The fatigue of square tubes means that many machine parts work under cyclic loads, and under such conditions the parts will fatigue.

2. The hardness of square tube is a measure of the softness and hardness of metal materials. At present, the commonly used method for measuring hardness in production is the indentation hardness method, which uses an indenter with a certain geometric shape to press into the surface of the metal material being tested under a certain load, and the hardness value is measured based on the degree of indentation. Commonly used methods for square tube hardness include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).

3. The impact toughness of square tubes refers to the load acting on the machine parts at a very high speed, which is called impact load. The metal's ability to resist damage under the impact load. Strength refers to the ability of a metal material to resist damage (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, flexural strength, shear strength, etc.

Uses of square and rectangular tubes:

Square and rectangular pipe is a widely used steel pipe material with many uses. The following are the main uses of square and rectangular tubes:

1.Construction industry
Square rectangular tube is a steel product commonly used in the construction industry. In building structures, square rectangular tubes can be used to manufacture components such as frames, supports, beams and columns. It has high strength and durability and can withstand a lot of heavy pressure and crushing. In addition, in construction, square and rectangular pipes are easy to process and weld, and are very suitable for on-site manufacturing and installation.

2. Transportation industry
Square and rectangular tubes are widely used in the transportation industry. For example, it can be used to manufacture various vehicle parts, such as wheel axles, frames, etc. Square and rectangular tubes have high strength and toughness, which can ensure the firmness and stability of the vehicle during driving. In addition, it can also be used to manufacture important transportation facilities such as railway tracks, bridges and tunnels.

3. Machinery industry
Square and rectangular tubes are also widely used in the machinery industry. For example, it can be used to manufacture brackets, brackets and other parts for various mechanical equipment. The surface of square and rectangular tubes has high flatness and is not easily deformed, which can ensure that the manufactured mechanical equipment has stable performance and high quality.

4. Other fields
In addition to the above fields, square and rectangular tubes can also be used in many fields such as manufacturing pipelines, power equipment, oil field equipment, and civil furniture. Its advantages are light weight, high strength, and easy processing, maintenance and transportation.

In short, the square and rectangular pipe is a highly versatile steel pipe product with a wide range of application scenarios and important functions. Whether in construction, transportation, machinery industry, or other fields, square and rectangular tubes can give full play to their advantages and provide stable and reliable support for different industries and fields.

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