Seamless square tube, as the name suggests, is a type of square shaped tube. Many materials can form a square tube body. It is used for various purposes and places. Most square tubes are made of steel pipes, mainly structural, decorative, and architectural square tubes

Square tube is a term for square pipes, which are steel pipes with equal side lengths. It is rolled from strip steel through process processing. Generally, the strip steel is unpacked, flattened, curled, and welded into circular tubes, which are then rolled into square tubes and cut to the required length. Usually 50 pieces per pack.

2 Specific Categories

Seamless square tube is made by extruding seamless round tube.

1. Performance index analysis of square tube - plasticity

Plasticity refers to the ability of metal materials to undergo plastic deformation (permanent deformation) under load without failure.

2. Performance index analysis of square tube - hardness

Hardness is a pointer to measure the softness and hardness of metal materials. The most commonly used method for measuring hardness in production is the indentation hardness method, which uses a certain geometric shape of the indenter to press into the surface of the tested metal material under a certain load, and determines its hardness value based on the degree of pressing.

The commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC), and Vickers hardness (HV).

3. Performance index analysis of square tube - fatigue

The strength, plasticity, and hardness discussed earlier are all indicators of the mechanical properties of metals under static loads. In fact, many machine parts work under cyclic loads, and under these conditions, the parts will experience fatigue.

4. Performance index analysis of square tube - impact toughness

The load acting on the mechanical components at a high speed is called impact load, and the ability of metals to resist damage under impact load is called impact toughness.

5. Performance index analysis of square tube - strength

Strength refers to the ability of a metal material to resist damage (excessive plastic deformation or fracture) under static load. Due to the various forms of load action such as tension, compression, bending, and shear, strength is also divided into tensile strength, compressive strength, flexural strength, shear strength, etc. There is often a certain correlation between various strengths, and in use, tensile strength is generally used as the most basic strength indicator.

Common specifications for square tubes

500 * 500 * 8~25 140 * 140 * 4~14

135 * 135 * 4~14

130 * 130 * 4~12

450 * 450 * 8~25 120 * 120 * 4~12

400 * 400 * 8~25 110 * 110 * 4~12

350 * 350 * 8~25 100 * 100 * 4~12

300 * 300 * 8~25 80 * 80 * 4~12

280 * 280 * 8~25 60 * 60 * 4~12

250 * 250 * 8~25 50 * 50 * 4~12

220 * 220 * 8~25 40 * 40 * 4~10

200 * 200 * 8~25 30 * 30 * 2~6

180 * 180 * 7~20 * 20 * 20 * 2~4

160 * 160 * 5-16

150 * 150 * 5~14

1. It can comply with the GB6728-2002 standard for cold-formed hollow section steel for structural use.

2. It can comply with the Japanese general construction seamless square tube adaptation range standard JISG3466-88.