First, classification of steel tube rectangle

Steel tube rectangular is a kind of steel pipe used in the construction field. It is widely used. There are different types according to different application fields. There are many classification methods for steel tube rectangular. The following is a brief introduction:

1. Classification by process

(1) Seamless steel tube rectangular: including hot-rolled seamless steel tube rectangular, cold-drawn seamless steel tube rectangular, and extruded seamless steel tube rectangular.

(2) Welded steel tube rectangular: According to the process, it can be divided into arc welded steel tube rectangular, electric resistance welded square pipe, gas welded square pipe, furnace welded square pipe; according to the welding seam, it can be divided into straight seam welded square pipe and spiral welded square pipe.

2. Classification by material

(1) Plain carbon steel steel tube rectangular: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.

(2) Low alloy steel tube rectangular: Q345, 16Mn, Q390, ST52-3, etc.

3. Classification according to production standards

There are mainly national standard square tube, Japanese standard square tube, British standard square tube, American standard square tube, European standard square tube, non-standard square tube, etc.

4. Classified by section shape

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

(2) Complex section: flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.

5. Classification by surface treatment

It can be divided into hot-dip galvanized steel tube rectangular, electro-galvanized steel tube rectangular, oil-coated steel tube rectangular, pickling steel tube rectangular, etc.

6. Classification by use

Including 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, square pipes for special purposes Wait.

7. Classification by wall thickness

According to the wall thickness, it can be divided into three types: ultra-thick wall square tube, thick wall square tube and thin wall square tube.

Second, what are the performance parameters of the steel tube rectangular?

According to the needs of different fields of use, the performance requirements of the square tube are also different. Generally, the performance parameters of the steel tube rectangular are mainly as follows:

1. Plasticity

It refers to the ability of a square tube to produce plastic deformation (permanent deformation) under load without damage.

2. Hardness

To measure the hardness of the square tube, the hardness of the square tube is usually measured by the indentation hardness method. Its hardness value, commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods.

3. Strength

Strength refers to the performance of the square tube against damage (excessive plastic deformation or fracture) under static load. The load is in the form of tension, compression, bending, shearing, etc., so the strength is also divided into tensile strength, compressive strength, etc. Strength, flexural strength, shear strength, etc., square tube generally mainly depends on tensile strength and flexural strength.