Manufacturing process and application fields of rectangular tubes

What is a rectangular tube?

Rectangular tube is a hollow square cross-section lightweight thin-walled steel tube, also known as steel cold-formed profile, which is a common pipe material. It is a square section steel with a square cross-section shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material, cold bending and high-frequency welding. It is widely used in construction, machinery manufacturing, automobile manufacturing and other fields. . The manufacturing process and technology of rectangular tubes are crucial to guarantee their quality and performance. The most common material is ASTM A500.

Classification of rectangular tubes:

Rectangular tubes are divided into seamless tubes and welded pipes (seamed tubes): hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes and welded square tubes.

Among them, welded square tubes are divided into:
1. According to the process - arc welded square tube, resistance welded square tube (high frequency, low frequency), gas welded square tube, furnace welded square tube;

2. According to the welding seam - straight seam welded square tube, spiral welded square tube.

Rectangular tube manufacturing process:

The manufacturing process of rectangular tubes mainly includes: raw material preparation, hot or cold rolling, welding, straightening, cutting and surface treatment.

First of all, raw material preparation is the first step in rectangular tube manufacturing. Commonly used raw materials include carbon steel, alloy steel, stainless steel, etc. These raw materials need to undergo cutting, heat treatment and other processes to meet the requirements of rectangular tubes. Secondly, hot rolling or cold rolling is a key step in manufacturing rectangular tubes. Hot rolling is to heat the raw materials to a certain temperature and then roll them through a rolling mill, while cold rolling is to roll at room temperature. Both rolling methods produce a rectangular cross-section from the raw material.

Next, welding is the process of welding the two edges of the rectangular tube together. Commonly used welding methods include resistance welding, arc welding and laser welding. The choice of welding process has an important impact on the quality and performance of rectangular tubes. Straightening is to ensure the straightness and flatness of the rectangular tube. The rectangular tube is straightened through mechanical straightening or hydraulic straightening to meet the usage requirements. Cutting is the process of cutting rectangular tubes to a certain length. Commonly used cutting methods include shearing, sawing and flame cutting.

Finally, rectangular tubes also require surface treatment to improve their corrosion resistance and aesthetics. Commonly used surface treatment methods include galvanizing, spraying and polishing.

The manufacturing process and technology of rectangular tubes are the key to ensuring their quality and performance. Through reasonable selection of raw materials, adoption of appropriate rolling and welding processes, straightening, cutting and surface treatment, rectangular tubes of excellent quality can be manufactured to meet various usage requirements.

Application areas of rectangular tubes:

Construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.

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