As the name suggests, the square tube is a square tube shape. Many materials can form a square tube body. What is the medium used for, and where is it used? Most of the square tubes are made of steel tubes. After unpacking, Flatten, crimp, and weld to form a round tube, which is then rolled into a square tube and cut to the required length. Generally, there are 50 square tubes per package. In terms of spot, the large size is mostly 10*10*0.8-1.5~~500*500*10-25. , Mechanical square tube, etc.

Square tube is a kind of cold-formed steel with square cross-section. . In addition to the thickening of the wall thickness of the hot-rolled extra-thick-walled square tube, its corner size and edge straightness have reached or even exceeded the level of the resistance-welded cold-formed square tube. The price of square tube is mainly based on the price of steel and the production process. The price of different materials and production processes is different, and the price is also affected by many factors, so the price of the pipe industry price is often changed.

Square tube is currently widely used and is an indispensable material for national construction. It is mainly used in a large number of industrial and mechanical products such as construction, machinery manufacturing, shipbuilding, power generation, automobiles, etc., but its most important use is still reflected. in the construction industry.

Square and rectangular pipe is a name for square pipe and rectangular pipe, that is, steel pipes with equal 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.

The allowable deviation of the wall thickness of the square and rectangular pipe shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is not greater than 10mm, and shall be plus or minus 8% of the wall thickness when the wall thickness is greater than 10mm. Except for wall thickness.

2. The usual delivery length of the square tube is 4000mm-12000mm, mostly 6000mm and 12000mm. The square rectangular tube is allowed to deliver short-length and non-fixed-length products not less than 2000mm, and it can also be delivered in the form of an interface tube, but the buyer should cut off the interface tube when using it. The weight of short-length and non-fixed-length products shall not exceed 5% of the total delivery quantity, and for square and rectangular pipes with a theoretical weight greater than 20kg/m, shall not exceed 10% of the total delivery quantity.

3. The curvature of the square tube shall not be greater than 2mm per meter, and the total curvature shall not be greater than 0.2% of the total length.

Process classification

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

Among them, the welded square tube is 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.

Material classification：

The square tube is divided into: ordinary carbon steel square tube, low alloy square tube.

1. Common carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.

2. Low alloy steel is divided into: Q345, 16Mn, Q390, ST52-3, etc.

Production Standard Classification

According to the production standard, the 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.

Section shape classification

Square tubes are classified by section shape:

1. Simple section square tube: square square tube, rectangular square tube.

2. Square tube with complex section: flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.

Surface treatment classification

According to the surface treatment, the square pipe is divided into: hot-dip galvanized square pipe, electro-galvanized square pipe, oiled square pipe, pickling square pipe.

Category of use

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 , Special purpose square tube.

Section shape classification

Square tubes are classified by section shape:

1. Simple section square tube: square square tube, rectangular square tube.

2. Square tube with complex section: flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.

Surface treatment classification：

According to the surface treatment, the square pipe is divided into: hot-dip galvanized square pipe, electro-galvanized square pipe, oiled square pipe, pickling square pipe.

Category of use：

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 , Special purpose square tube.

Wall Thickness Classification

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

Application areas: Widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container skeletons, furniture, decoration and steel structures.

Used in engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouse, bicycle rack, motorcycle rack, shelf, fitness equipment, Leisure and tourism products, steel furniture, various specifications of oil casing, oil pipe and line pipe, water, gas, sewage, air, heating and other fluid transportation, fire protection and support, construction, etc.