1, price, the price of square pipe products with different processes of galvanized steel pipe is also different. They are also the main indicators to measure the price of square pipe, and the other is the work and material quality.
2, pay attention to the size of Ji'nan galvanized pipe purchase when 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 and width. Reach the required standard loading transport.
3, the anti pollution of square tube. Ji'nan square tube galvanized pipe manufacturers choose to pour a small amount of ink or water in the face of brick standing about two minutes, then rinse with water or wipe with a cloth, see traces are obvious, such as only a few traces of the tube body, low water absorption, good anti pollution, physical and chemical properties such as obvious or better; serious traces, the tube body vitreous degree is bad, poor quality.
4. The density of the square tube. Choose another method of the square tube is 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, square tube is inferior quality of products, and even pipe body may have a crack.
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