Classification and production process of galvanized square tubes

Galvanized square tubes are hollow square steel tubes with a square cross-section.

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These are made from hot-rolled or cold-rolled galvanized steel strip or galvanized coil, cold-bent, and then high-frequency welded. Alternatively, they can be made from pre-made cold-bent hollow steel tubes that are then hot-dip galvanized.

Galvanized square tubes are divided into hot-dip galvanized and cold-dip galvanized types based on their production processes. These differences in processing lead to distinct physical and chemical properties. Generally speaking, they differ significantly in strength, toughness, and mechanical properties.

Hot-dip galvanized square tubes [https://www.steelfsd.com/galvanized-square-and-rectangular-steel-tube-product/]Hot-dip galvanized square tubes are made by welding steel sheet or strip after coiling. These square tubes are then placed in a hot-dip galvanizing bath and undergo a series of chemical reactions to form the tubes. The production process is relatively simple, highly efficient, and available in a wide variety of sizes. These square tubes require minimal equipment and capital, making them suitable for small galvanized square tube manufacturers. However, in terms of strength, this type of steel pipe is far weaker than seamless square pipe.

Cold-Dip Galvanized Square Pipe [https://www.steelfsd.com/galvanized-square-and-rectangular-steel-tube-product/]Cold-dip galvanized square pipe utilizes the cold-dip galvanizing principle to impart corrosion resistance to the square pipe. Unlike hot-dip galvanizing, cold-dip galvanizing primarily utilizes electrochemical corrosion protection. Therefore, sufficient contact between the zinc powder and the steel must be ensured to generate an electrode potential difference, making steel surface treatment crucial.

Square tube specificationsmm
Rectangular tube specificationsmm

16 times 16 times 0.41.5
380 times 380 times 8.014.0
10 times 20 times 0.61.5
250 times 150 times 612.0

18 times 18 times 0.41.5
400 times 400 times 8.014.0
14 times 21 times 0.61.5
250 times 100 times 612.0

20 times 20 times 0.41.5
420 times 420 times 10.014.0
15 times 30 times 1.51.5
250 times 200 times 612.0

25 times 25 times 0.62.0
450 times 450 times 10.014.0
15 times 38 times 0.61.5
300 times 150 times 612.0

30 times 30 times 0.64.0
480 times 480 times 10.014.0
20 times 30 times 0.62.0
300 times 200 times 612.0

34 times 34 times 1.02.0
500 times 500 times 10.014.0
20 times 40 times 0.82.0
300 times 250 times 612.0

35 times 35 times 1.04.0
The specifications for the otherchanges are as follows
20 times 50 times 1.02.0
400 times 250 times 812.0

38 times 38 times 1.04.0
550 times 550 times 10.040.0
22 times 35 times 0.92.0
400 times 300 times 812.0

40 times 40 times 1.04.5
600 times 600 times 10.040.0
25 times 40 times 0.93.75
450 times 200 times 812.0

44 times 44 times 1.04.5
700 times 700 times 10.040.0
25 times 65 times 1.02.0
450 times 250 times 812.0

45 times 45 times 1.05.0
800 times 800 times 10.050.0
30 times 40 times 1.03.75
400 times 300 times 812.0

50 times 50 times 1.05.0
900 times 900 times 10.050.0
30 times 45 times 1.03.75
400 times 350 times 812.0

60 times 60 times 1.55.0
1000 times 1000 times 10.050.0
30 times 50 times 1.04.0
500 times 200 times 1012.0

70 times 70 times 2.06.0

30 times 60 times 1.04.5
500 times 250 times 1012.0

75 times 75 times 2.06.0

40 times 50 times 1.04.5
500 times 300 times 1012.0

80 times 80 times 2.06.0

40 times 60 times 1.05.0
500 times 350 times 1012.0

85 times 85 times 2.06.0

40 times 80 times 1.55.0
500 times 400 times 1012.0

95 times 95 times 2.08.0

40 times 100 times 2.05.0
500 times 450 times 1012.0

100 times 100 times 2.08.0

50 times 60 times 2.05.0
The specifications for thechanges are as follows

120 times 120 times 4.08.0

50 times 80 times 2.05.0
600 times 200 times 1028.0

150 times 150 times 6.010.0

50 times 100 times 2.08.0
600 times 400 times 1028.0

180 times 180 times 6.012.0

60 times 80 times 2.06.0
600 times 500 times 1028.0

200 times 200 times 6.012.0

80 times 100 times 2.08.0
800 times 400 times 1028.0

220 times 220 times 6.014.0

120 times 60 times 2.510.0
800 times 600 times 1028.0

250 times 250 times 6.014.0

120 times 80 times 2.510.0
800 times 700 times 1028.0

280 times 280 times 6.014.0

150 times 100 times 2.512.0
1000 times 400 times 1028.0

300 times 300 times 8.014.0

180 times 150 times 2.512.0
1000 times 500 times 1028.0

320 times 320 times 8.014.0

200 times 100 times 412.0
1000 times 600 times 1028.0

350 times 350 times 8.014.0

200 times 150 times 412.0
1000 times 800 times 1028

Differences Between Hot-Dip and Cold-Dip Galvanizing [https://www.steelfsd.com/galvanized-square-and-rectangular-steel-tube-product/]

Galvanized square pipes are classified into two categories: hot-dip galvanized square pipes and electrogalvanized square pipes. Hot-dip galvanizing can be performed using wet, dry, lead-zinc, and redox methods. The primary difference between hot-dip galvanizing methods lies in the method used to activate the pipe surface after acid cleaning to improve the quality of the galvanizing. The dry and redox methods are currently used in production, with their characteristics shown in the table. Electrogalvanized zinc coatings produce a very smooth, dense, and uniform zinc layer with excellent mechanical properties and corrosion resistance. Zinc consumption is 60% to 75% lower than hot-dip galvanizing. Electrogalvanizing is technically complex, but it is essential for single-sided coating, double-sided coating with different thicknesses on the inner and outer surfaces, and thin-walled tube galvanizing.

Applications of Galvanized Square Tubes [https://www.steelfsd.com/galvanized-square-and-rectangular-steel-tube-product/]

Galvanized square tubes are treated with zinc, significantly expanding their application range compared to square tubes. They are primarily used in curtain walls, construction, machinery manufacturing, steel construction projects, shipbuilding, solar panels, steel structures, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, and airports.

Characteristics of Galvanized Square Tubes [https://www.steelfsd.com/galvanized-square-and-rectangular-steel-tube-product/]

Galvanizing offers enhanced protection and corrosion resistance. The entire structure is composed of zinc, forming dense quaternary crystals that form a barrier on the steel plate, effectively preventing corrosion factors from penetrating. This corrosion resistance stems from the strong barrier layer protection provided by zinc. When zinc acts as a sacrificial protection on cut edges, scratches, and abrasions on the coating, it forms an insoluble oxide layer, fulfilling its barrier function.requirements for hydrostatic

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