Changsha Xiangjia Metal Materical Co., Ltd.

  Galvanized steel pipe  is one of types of galvanized products, and the product is very complicated. If customers do not know galvanized steel pipes well, there will be many problems when buy. Therefore, it is nessary to know basic knowledge and skills of galvanized steel pipe. Pay attention to the following points when buying galvanized steel pipe: 1. Appearance: There are regulations of industry standards on appearance quality requirements, especially in terms of delamination, scarring, cracks, etc. The regulations are specific, and there are also regulations for geometric deviations in the implementation standards, such as Curvature, side width, side thickness, top angle number, theoretical quality and other items have strict regulations, which can be well reflected in appearance, and are also a very effective basis for distinguishing the quality of galvanized steel pipes. 2. Chemical composition discrimination: It is scientific to distinguish by chemical composition, beca...

With the development of the economy, the demand of galvanized steel pipes increasing day by day. But most of people may not know the precautions for welding  galvanized pipes . The seam must be polished before welding, otherwise will have bubbles, trachoma, false welding, etc. It will also drop the welds brittle and the rigidity.  Characteristics of welding galvanized steel Usually galvanized steel coated with zinc on the low carbon steel, and the galvanized layer is about 20um thick. The melting point of zinc is around 419 ° C and the boiling point is around 908 ° C. In welding, zinc melts into a liquid and floats on the surface of the molten pool or at the root of the weld. Zinc has greater solid solubility in iron, zinc liquid will deeply etch the weld metal along the grain boundary, and low melting point zinc forms "liquid metal embrittlement". At the same time, zinc and iron can form brittle compounds between metals, these brittle phases reduce the plasticit...