Galvanized square pipe produced by this method is the most important product in cold galvanized square pipe. Because this galvanized method has the characteristics of low production cost, easy operation, galvanized layer is more stable. This is also the reason why many of our galvanized square pipe manufacturers take a fancy to this galvanized square pipe. The principle of electrogalvanizing is mainly to use electrolysis to form a uniform, dense and well-combined metal zinc deposition layer on the surface of the workpiece. The zinc layer produced by this galvanizing method is relatively stable, and it is not easy to fall off, which gives this kind of cold galvanized pipe a big bonus in corrosion resistance. The problem of zinc layer stability in other cold galvanizing methods is solved effectively.Cold galvanized square pipe It is mainly used to coat the surface of the square tube with zinc coating, which will form a metal zinc coating on the surface of the square tube, which can largely isolate the contact between the square tube and the outside world, and also effectively avoid the corrosion of the atmospheric tube. But its disadvantage is that because it is coated galvanized, galvanized layer is not very stable, easy to scratch and knock off. But it also has its advantages and convenience. Because once the damage is found, we can use paint to repair the damage without having to re-galvanize. This is unmatched by other galvanized square pipe.High quality cold galvanized steel, and after the surface treatment in accordance with specifications, but also must rely on good coating construction, in order to give full play to the greatest advantage of cold galvanized steel, effective protection. In addition to various specifications, various types of cold galvanized aerosol cans, cold galvanized construction methods are most commonly used: brush coating, air spraying and high pressure airless spraying 3. Roller coating speed is fast, but because of poor permeability, air is often trapped in the film, so it is not suitable for primer "cold galvanized" coating. The electric galvanizing process is as follows: chemical degreasing → hot water washing → water washing → electric removing oil → hot water washing → water washing → strong corrosion → water washing → electric galvanizing iron alloy → water washing → light washing → passivation → water washing → drying. A formula to calculate Square tube weight calculation formula: 4* wall thickness * (side length - wall thickness) *7.85. For example: square tube 50*50*5*6m, denoted as: 50(width)* 50(width)*5 (wall thickness)* 6m (number of meters). Because the square tube is equilateral, that is, the number of meters commonly used is 6 meters; The general industry is simply expressed as: 50*5. According to the expression method of square tube, square tube generally takes side width and wall thickness as the expression standard.| Product Name | Cold galvanized square pipe | ||
| (O.D) Outer Diameter | 10MM*10MM-500MM*500MM | ||
| (W.T)Wall thickness | 0.6MM-20MM | ||
| Length | 1M, 4M, 6M, 8M, 12M (accroding to the buyer's request) | ||
| Ends | Plain, Beveled, Thread With Couplings Or Sockets; Plastic Caps And Steel Rings Can Be Provided If Possible | ||
| Standard | GB/T3091-2001 , BS 1387-1985 , DIN EN10025 , EN10219 , JIS G3444:2004 , ASTM A53 SCH40/80/STD , BS- EN10255-2004 | ||
| Grade | Q195/Q215/Q235/Q345/S235JR/GR.B-D/STK500 | ||
| Technique | Hot Rolled Or Cold Rolled ERW | ||
| Package | Covered With Tarpaulin, Containers Or In Bulk | ||
| Certification | CE, BV, SGS, ISO9001, API | ||
| Delivery Time | stock or Usually within 10-45 days after receipt of advance payment | ||
| Pre-Galvanized Steel Pipe | |||
| (Square)SHS | (Rectangular)RHS | ||
| (Out dia.)mm | (Wall thickness)mm | (Out dia.)mm | (Wall thickness)mm |
| 15*15 | 0.7-2.0 | 20*30 | 0.7-2.0 |
| 20*20 | 0.7-2.0 | 20*40 | 0.7-2.0 |
| 25*25 | 0.7-2.0 | 25*50 | 0.7-2.0 |
| 30*30 | 0.7-2.0 | 30*40 | 0.7-2.0 |
| 38*38 | 0.7-2.0 | 30*50 | 0.7-2.0 |
| 40*40 | 0.7-2.0 | 40*60 | 0.7-2.0 |
| 50*50 | 0.7-2.0 | 40*80 | 0.7-2.0 |
| 60*60 | 0.7-2.0 | 37*57 | 0.7-2.0 |
| 80*80 | 0.7-2.0 | 27*47 | 0.7-2.0 |
| 100*100 | 0.7-2.0 | 37*77 | 0.7-2.0 |
| 50*100 | 0.7-2.0 | ||