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What are the principles for selecting materials for chemical engineering equipment? Chemical processing equipment is used in many industries. The selection of materials for such equipment follows similar principles to those used in equipment selection and design: it is necessary to first meet the requirements of the process and the equipment itself, while also taking into account factors such as technological advancement, safety, reliability, and cost-effectiveness. http://img.mp.itc.cn/upload/20160930/9e70050a4d9248f990754d235b4dcd1b_th.jpg First, the material used is reliable, ensuring safe operation. The equipment serves as a medium for chemical reactions; it is the place where production takes place, and therefore it is essential to pay close attention to safety and operational reliability in this area. Therefore, the materials chosen must be foolproof, with safety coming first. Of course, chemical processing equipment has a **specified design service life; when selecting materials, it is also necessary to take into account the guarantee of that service life. Secondly, meeting the requirements of the process and equipment. This is the most fundamental criterion for material selection; based on the process conditions and operating conditions (such as temperature, pressure, medium, environment, etc.), priority is given to properties such as mechanical strength, corrosion resistance, and solvent resistance, and materials with sufficient strength, plasticity, and toughness that can withstand corrosion by the medium are chosen. Third, they are easy to process, and their performance is not greatly affected by the processing steps. Chemical equipment is always made from materials, and some materials may experience a deterioration in their properties during processing; moreover, some materials are difficult to work with. Such materials are not suitable choices or primary options for use, as the changes in their properties during processing cannot be controlled. Additionally, materials that are difficult to process inevitably increase the cost of production. Fourth, the materials should be based on the local and domestic markets, taking advantage of China’s abundant resources. The amount of material used in chemical processing equipment is generally small; while striving to use advanced materials, it is necessary to meet the needs of the local and domestic markets. Our country possesses considerable resources, including a large abundance of rare earth elements that account for the majority of the world’s reserves. There are also certain special metals such as tungsten and antimony. While the reserves of some other metals may be limited, when selecting materials it is advisable to use those that are abundant in our country, provided that quality is maintained. This not only helps to reduce costs but also promotes the development of related industries in our country. Fifth, calculation of comprehensive economic indicators: After selecting the materials, these need to be turned into equipment. The costs involved are not limited to just the cost of the materials themselves; they also include transportation and handling fees, processing fees, additional processing charges, maintenance costs, as well as future expenses related to spare parts and equipment repairs. An economic assessment should be carried out in a comprehensive manner, with the aim of choosing materials that are both inexpensive and of high quality.