What is a 4x4 square steel tube

4x4 square steel tube is a name for square tube and rectangular tube, that is, a hollow tube with equal side lengths and unequal side lengths. It is made of strip steel that has been processed and rolled. Generally, the strip is unpacked, flattened, coiled, welded to form a round tube, and then rolled into a square tube from the round tube and then cut to the required length.

Products are widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automotive industry, railways, highway guardrails, container skeletons, furniture, decoration and steel structures.

Seamless 4x4 Rectangular pipe Weight Specifications

A seamless 4x4 rectangular tube is a long strip of steel with a hollow section without seams around the perimeter. The inside of the pipe is hollow, with a certain cross-sectional area, and is used in large quantities as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials, etc.

• Common specifications: square tube side width 15mm*15mm-600mm*600mm thickness 3.0mm-25mm

• Rectangular tube side width 30mm*20mm-500mm*600mm thickness 3.0mm-25mm

• Common length: 6M, 12M, can also be customized according to customer requirements

• Common materials: 20#, 45#, Q345B, 45CrMo, 15CrMoG, etc.

• Weight calculation formula: ((outer diameter - wall thickness) wall thickness) 0.02466=kg/m

• Square tube side width * 4 divided by 3.14 = outer diameter of round tube

• Rectangular tube (large side width + small side width) *2 divided by 3.14 = the outer diameter of the round tube

Welded 4x4 Rectangular Tube Specifications

Welded 4x4 square pipe is a kind of hollow square section light-weight thin-walled steel tube, also known as steel cold bending section. It is made of Q235B, Q345B hot-rolled or cold-rolled strip or coil as the base material, which is formed by cold bending and then high-frequency welding. Commonly used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power brackets, steel structure engineering, etc.

• Square tube: 200 x 200x8mmx12M

It is expressed as a square steel pipe with a height of 200mm, a width of 200mm, a thickness of 8mm and a length of 12 meters.

• Square tube: 200x 100x 5mmx6M

It is expressed as a rectangular steel pipe with a height of 200mm, a width of 100mm, a thickness of 5mm and a length of 6 meters.

• Common specifications: square tube side width 15mm*15mm-600mm*600mm thickness 1.0mm-20mm

• Rectangular tube side width 30mm*20mm-400mm*300mm thickness 1.0mm-20mm

• The weight calculation formula of 4x4 welded square tube is the same as that of 1/8 seamless square tube

Classification of 4x4 square tube

• According to the production process, the 4x4 square tube is divided into: hot-rolled seamless square tube, cold-drawn seamless square tube, extruded seamless square tube, welded square tube (of which the welded square tube is divided into 1, according to the process - arc welding 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).

• The 4x4 square tube is divided into: ordinary carbon steel square tube (Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.), low alloy square tube (Q345, 16Mn, Q390, ST52-3, etc.).

• 4x4 square tube is divided into production standard: national standard square tube, Japanese standard square tube, British standard square tube, American standard square tube, European standard square tube, non-standard square tube.

• 4x4 square tube is divided into simple section square tube (square square tube, rectangular square tube.) Complex section square tube (flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.)

• 4x4 square tube is divided into surface treatment: hot-dip galvanized square tube, electro-galvanized square tube, oil-coated square tube, pickling square tube.

• 4x4 square pipes are classified by use: square pipes for decoration, square pipes for machine tools, square pipes for machinery industry, square pipes for chemical industry, square pipes for steel structures, square pipes for shipbuilding, square pipes for automobiles, square pipes for steel beams and columns Tube, special purpose square tube.

• 4x4 rectangular tubes are classified by wall thickness: ultra-thick-walled rectangular tubes, thick-walled rectangular tubes and thin-walled rectangular tubes.

4x4 square steel tubing classification

According to the production process, square tubes are divided into: (0.2.1.6.1.5.3.1.1.1.6) hot rolled seamless square tubes, cold drawn seamless square tubes and extruded seamless square tubes

Welded square pipe.

The welded square pipe is divided into:

(a) According to the process - arc welding square tube, resistance welding square tube (high frequency and low frequency), gas welding square tube and furnace welding square tube

(b) According to the welding seam of square pipe and spiral pipe

Material classification

Square tubes are divided into ordinary carbon steel square tubes and low alloy square tubes according to material.

Ordinary carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc. (1.3.9.1.8.4.8.1.0.9.2);

Low alloy steel is divided into Q345, 16Mn, Q390, St52-3, etc.

Production standard classification

Square tube is divided into national standard square tube, Japanese standard square tube, British standard square tube, American standard square tube, European standard square tube and non-standard square tube according to production standards.

Section shape classification

Square pipes are classified according to section shape:

(1) Simple section square tube - square tube, rectangular tube

(2) Square tube with complex section - flower shaped square tube, open square tube, corrugated square tube and special-shaped square tube

Surface treatment classification

Square tubes are divided into hot-dip galvanized square tubes, electro galvanized square tubes, oiled square tubes and pickled square tubes according to surface treatment

Use classification

Square tubes are classified according to their uses - square tubes for decoration, machine tool equipment, mechanical industry, chemical industry, steel structure, shipbuilding, automobile, steel beam and column and special purposes

Wall thickness classification

Square tubes are classified by wall thickness - super thick wall square tubes, thick wall square tubes and thin wall square tubes