1. Price. A penny of this sentence is still prevalent in the pipe industry, the more square tube galvanized more likely not cheap and reliable quality, the second moments of different process tube product prices are not the same, the main indicators of them is also a measure of square pipe prices, there is also good workmanship, materials, raw materials well certainly expensive, this is indisputable.
2, pay attention to the size of Ji'nan galvanized pipe buy time, don't put a large number of square tube buy back size deviation, so that not only delayed their use, will the unnecessary waste of freight, so when the car will start Jiezhuang factory inspection, can measure the square tube length, width so, reach the required standard loading delivery, did not reach the standard, to allow manufacturers to modify.
3, the anti pollution of square tube. When choosing Ji'nan galvanized pipe, pour it on the brick surface for about two minutes with a small amount of ink or water, then rinse it with water or wipe with cloth to see if the residual trace is obvious. If there are only a few traces, it has low water absorption rate, good antifouling property and good physical and chemical properties.
4. The density of the square tube. Choose another way Ji'nan is galvanized pipe gently knocking brick, carefully on whether to listen to the voice of melody, there is a metal sound, the brick body of high density, good sintering; sound rough boring, the tube bottom sintering degree, density is not high; if the percussion sound hoarse, which belongs to the square tube inferior goods, even the tube body may have cracks.
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