Carbon steel square tube is a common type of metal pipe，Widely used in architecture、Machinery manufacturing、Steel structure and other fields。The following is a detailed introduction about carbon steel square tubes：

one、Material characteristics

High strength

Carbon steel square tube has high tensile strength and yield strength，Capable of withstanding large loads。for example，Q235The yield strength of carbon steel square tube shall not be lower than235MPa，The tensile strength is370-500MPabetween，Suitable for structural components that require significant pressure and tension。

Good resilience

Carbon steel square tube has good toughness at room temperature，Capable of withstanding a certain degree of impact load。This enables it to effectively resist the impact of sudden external forces such as earthquakes in building structures。

Good processability

Carbon steel square tube can be cut、welding、Various processing methods such as bending are used to produce components of various shapes and sizes。for example，In steel structure buildings，Carbon steel square tubes can be welded together to form a frame structure，It can also be made into various shapes of decorative components through cutting and bending。

two、Production process

Raw material selection

The raw material for carbon steel square tubes is usually carbon structural steel，in compliance withQ235、Q355class。These steels have good comprehensive performance，Suitable for manufacturing square tubes。

Molding Process

Hot rolling forming：After heating the steel to a certain temperature，Roll it into a square cross-section through rolling equipment。Hot rolled carbon steel square tube has high dimensional accuracy，Good surface quality。

ROLL FORMING：Bend steel into a square cross-section at room temperature using bending equipment。Cold formed carbon steel square tubes are suitable for producing small-sized and thin-walled square tubes。

procedure

Using high-frequency welding or submerged arc welding technology to weld the formed steel into square tubes。Strict control of welding parameters is required during the welding process，Ensure the quality and strength of the weld seam。

Surface Treatment

Carbon steel square tube after production completion，Usually requires surface treatment。Common surface treatment methods include sandblasting for rust removal、Painting and anti-corrosion measures, etc。Sandblasting rust removal can remove oxide scale and impurities on the surface of steel，Spraying anti-corrosion paint can improve the corrosion resistance of square pipes。

three、Specification

Edge length range

The edge length range of carbon steel square tube is usually from20mmarrive300mmunequal。for example，20mm×20mmSmall square tubes are commonly used for lightweight steel structures and decorative purposes，But300mm×300mmThe large-sized square tube is used for large-scale building structures and bridge construction。

Wall thickness range

The wall thickness generally ranges from1.0mmarrive10.0mmunequal。Thin walled carbon steel square tube（in compliance with1.0mm-2.0mm）Suitable for lightweight structures and decorative purposes，And thick walled carbon steel square tube（in compliance with6.0mm-10.0mm）Used for structural components that can withstand large loads。

length specification

The standard length is generally6rice，But other lengths can also be customized according to customer needs，in compliance with3rice、4rice、8Rice, etc。In construction，Longer carbon steel square tubes can reduce the number of joints，Improve construction efficiency。

four、application area

Construction field

Steel structure building：Carbon steel square tube is one of the main materials for steel structure buildings。It can be used to construct the framework structure of buildings，Like a beam、column、Support, etc。for example，In a large factory building、stadium、In exhibition halls and other buildings，The carbon steel square tube frame structure can provide sufficient strength and stability，Simultaneously possessing excellent seismic performance。

Decorative use：Carbon steel square tubes can also be used as decorative components in buildings，Like a railing、handrail、Curtain wall skeleton, etc。By spraying paint、Surface treatment processes such as electroplating，Carbon steel square tube can present different appearance effects，Meet the aesthetic requirements of the building。

Mechanical manufacturing field

Mechanical structural components：In mechanical manufacturing，Carbon steel square tubes are commonly used to manufacture various mechanical structural components，Like equipment bracket、workbenches、Conveyor frame, etc。These structural components need to withstand certain loads and vibrations，The high strength and good toughness of carbon steel square tubes can meet these requirements。

automobile making：Carbon steel square tubes are also used for some non critical components in automotive manufacturing，Like the body frame、Chassis support, etc。It can provide sufficient strength and stability，Simultaneously reducing manufacturing costs。

Bridge construction field

Bridge components：In bridge construction，Carbon steel square tube can be used to manufacture bridge piers、Bridge deck support、Components such as railings。The high strength and good fatigue resistance of carbon steel square tubes enable them to withstand the loads of bridges and various stresses during long-term use。

Furniture manufacturing field

Metal furniture：Carbon steel square tube can be used to manufacture metal furniture，Like an office desk、filing cabinet、Display racks, etc。It has sufficient strength and stability，At the same time, different appearance effects can be achieved through surface treatment processes，Meet the aesthetic and practical requirements of furniture。

five、Selection precautions

Material selection

Select appropriate carbon steel materials based on the usage environment and load requirements。for example，For structural components that need to withstand large loads，Higher yield strength should be selectedQ355carbon steel；For general purpose structural components，Q235Carbon steel is an economical choice。

dimensional accuracy

Ensure that the dimensional accuracy of the carbon steel square tube meets the design requirements。Excessive dimensional deviation can affect the assembly accuracy and stability of the structure。for example，In steel structure buildings，The deviation of the side length and wall thickness of the square tube should be within the allowable range，To ensure tight connections between components。

Surface Treatment

Choose the appropriate surface treatment method based on the usage environment。If square tubes are used in outdoor environments，Anti corrosion treatment such as painting or hot-dip galvanizing should be carried out，To enhance its corrosion resistance；If used in indoor environments，Spray painting can be selected according to aesthetic requirements、Surface treatment processes such as electroplating。

welding quality

Welding is one of the main methods for connecting carbon steel square tubes，The welding quality directly affects the strength and stability of the structure。During the welding process，Suitable welding materials and welding processes should be selected，Ensure the quality and strength of the weld seam。for example，When welding thick walled carbon steel square tubes，Multi layer and multi pass welding process should be adopted，To ensure the uniformity and strength of the weld seam。

cost control

When selecting carbon steel square tubes，Cost factors also need to be considered。Different materials、The price difference of carbon steel square tubes with different sizes and surface treatment methods is significant。On the premise of meeting the usage requirements，Carbon steel square tubes with high cost-effectiveness should be selected as much as possible，To reduce engineering costs。