Casting detection include dimensional inspection, visual inspection of the appearance and surface chemical analysis and mechanical testing, the requirements of the more important problems or prone to casting on the casting process, but also the need for non-destructive testing of port bollard supply, NDT techniques can be used to test the quality of ductile iron castings, including liquid penetrant testing, magnetic particle testing, eddy current testing, radiographic testing, ultrasonic testing and vibration testing. Liquid metal forming process more precise and difficult to control, making the casting quality is not stable enough. Compared with the forging of the same material, because the liquid forming tissue loose, coarse grains, internal easy to produce shrinkage, shrinkage, porosity and other defects. Its low mechanical properties. In addition, labor-intensive, poor conditions. Have excellent mechanical and physical properties, it can have a variety of strength, hardness, toughness overall performance, but also combines one or more specific properties such as wear resistance, high temperature and low temperature resistance, corrosion resistance and so on. Casting weight and size range are very wide, weighs only a few grams of the lightest port bollard products, the most important port can reach 400 tons bollard manufacturers, the thinnest wall thickness of only 0.5 mm, the thickness may be more than one meters in length by a few millimeters to ten meters, can meet the requirements of different industrial sectors. Port bollard manufacturers _ _ bollard port machinery provided by Qingdao Hua Chen Hua Chen Machinery Co., Ltd .. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) strong, credible, in Qingdao, Shandong CNC machine tool industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chen Hua machinery and you hand into the brilliant, for a better future!