1. The quality of galvanized pipes depends first on the quality of steel pipes. The corrosion resistance of stainless steel with high nickel content and low carbon content in good rigid pipes is better. Look at the appearance of defects, such as cracks, brightness.
2. Then it is galvanized. Galvanized square tubes can be divided into hot galvanized square tubes and galvanized square tubes. The main difference between different hot-dip galvanizing methods is how to activate the outside surface of the pipe to improve the galvanizing quality after acid leaching cleaning. Dry and oxidative recovery methods are mainly used in current consumption, and their characteristics are shown in the table. The zinc coating of galvanizing is very lubricated and compact, with average structure, good mechanical properties and corrosion resistance, and its zinc consumption is 60%-75% lower than that of hot-dip galvanizing. Zinc plating is technically complicated, but it is necessary to use this method for single-sided coating, double-sided coating with different thickness of inner surface coating and thin-walled tube galvanizing. The service life of galvanized steel pipe in greenhouse is comparatively long.
3. Usually, the poor quality galvanized steel pipe presents a folding situation, and the appearance of the folding galvanized steel pipe is the main reason for this folding line. This defect often runs through the longitudinal direction of the whole product. The reason for folding is that some manufacturers who can not meet the demand are too seeking high power, and this is biased in the reduction. This kind of folding will occur at a large time, and if the galvanized pipe with this folding stops bending, it will crack, so the strength of the steel is not very strong.
4. Galvanized pipes with poor quality are prone to scarring. Because the raw materials consumed by common galvanized pipes with poor quality are mostly uneven, and the magazines contained in them are comparatively high. And the low-quality galvanized pipe manufacturers'consumer equipment is mostly very crude, it is easy to form problems such as sticking steel, which will show scars on the consumption of galvanized pipe. Therefore, high quality steel pipe should be selected to ensure the strength of the greenhouse.
With the summary above Jinan galvanized pipe, I hope it will be helpful to our customers. If you don't understand or ask for help, please click on our official website: http://www.jnxxjm.com or call for consultation. We will try our best to solve it for you.