Introduction To The Classification Of Large Diameter Square Tubes

1. Classification of the production process of large-diameter square tube

Large-diameter square tubes are divided according to the production process: hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, and welded square tubes. Among them, the welded square tube is divided into (a) according to the process - arc welded square tube, resistance welded square tube (high frequency, low frequency), gas welded square tube, furnace welded square tube (b) according to the weld - - straight Seam welded square tube, spiral welded square tube.

2. Material classification of large-diameter square tubes

Square tubes are divided according to material: plain carbon steel square tubes, and low alloy square tubes. Common 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, etc.

3. Classification of production standards for large-diameter square and rectangular pipes

Square tubes are divided according to production standards: national standard square tubes, Japanese standard square tubes, imperial square tubes, American standard square tubes, European standard square tubes, and non-standard square tubes.

4. Classification of section shapes of large-diameter square and rectangular pipes

Square tubes are classified according to the cross-sectional shape: (1) Simple cross-section square tubes - square tubes, rectangular square tubes (2) Complex cross-section square tubes - flower-shaped square tubes, open-shaped square tubes, square corrugated tubes, special-shaped square tubes.

5. Classification of surface treatment of large-diameter square tubes

Square tubes are divided according to surface treatment: hot-dip galvanized square tubes, electro-galvanized square tubes, oil-coated square tubes, and pickling square tubes.

6. Classification of use of large-diameter square tube

Square tubes are classified according to their uses - square tubes for decoration, square tubes for machine tools, square tubes for the machinery industry, square tubes for the chemical industry, square tubes for steel structures, square tubes for shipbuilding, square tubes for automobiles, steel beams, and columns Square tube, particular purpose square tube.

7. Wall Thickness Classification of Large Diameter Square Rectangular Pipe

Large-diameter rectangular tubes are classified according to wall thickness--ultra-thick-walled large-diameter rectangular tubes, thick-walled large-diameter rectangular tubes, and thin-walled large-diameter rectangular tubes.