There are many manufacturers of rectangular tube in Hebei area. Many friends can't figure out what type they need when buying square tube. Today, Xiaobian will explain about the classification of square tube.
(1) Classification according to the shape of the square tube section:
The square tube section shape classification can be divided into two types, namely (1) simple section square tube: square square tube, rectangular square tube; (2) complex section square tube: flower square tube, open square tube, corrugated Square tube, shaped square tube;
(2) Classification by wall thickness of square tube
Square tube can be divided into super thick square rectangular tube, thick wall square rectangular tube and thin wall rectangular tube according to wall thickness classification;
(3) Classification according to square tube production process
Square tube manufacturers, according to the production process can be divided into square tube, hot-rolled seamless square tube, cold drawn seamless square tube, extruded seamless square tube, welded square tube. The welded square tube is further divided into: (1) according to the process points - arc welded square tube, electric resistance welded square tube, gas welded square tube, furnace welded square tube; (2) according to weld seam - straight seam welded square tube, Spiral welded square tube;
(4) Classification by square tube use
According to the application square tube can be divided into: square tube for decoration, square tube for machine tool equipment, square tube for machinery industry, square tube for chemical industry, square tube for steel structure, square tube for shipbuilding, square tube for automobile, steel beam column Use square tube, special purpose square tube;
(5) Classification according to the square tube production standard
Square tubes are divided according to production standards: national standard square tube, Japanese standard square tube, inch square tube, American standard square tube, European standard square tube, non-standard square tube;
(6) Classification by square tube surface treatment
The square tube is divided into: hot-dip galvanized square tube, electro-galvanized square tube, oil-coated square tube, and acid-washed square tube according to surface treatment;
(7) Classification by square tube material
The square tube is divided into a common carbon steel square tube and a low alloy square tube according to the material. The carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.; low alloy steel is divided into Q345, 16Mn, Q390, ST52-3 and so on. For example, Q345 low alloy square tube is a low alloy series, low alloy high strength structural steel (GB/T1591-1994). Q345A, B, C, D, E are the representative grades of this type of steel, of which Q345A alloy tube, Q345B alloy tube grade steel is usually called 16Mn, this material is the most common; Q345 low alloy tube means: Q represents this The yield of the material, the latter 345, refers to the yield value of this material, around 345. In addition, Q345A, Q345B, Q345C, Q345D, Q345E, etc., are grades, which represent the difference in the temperature of the impact.
