Common sheet metal materials Common sheet metal materials 1. Galvanized steel There are two main types of galvanized steel: 1. Electro-galvanized sheet (EG) 2. Hot-dip galvanized sheet (GI). Table 1: Comparison table of electro-galvanized sheet and hot-dip galvanized sheet [pic] 2. Stainless steel A general term for stainless acid-resistant steel that resists corrosion from atmospheric, acid, alkali, salt and other media. To achieve stainless corrosion resistance, the chromium (Cr) content must be no less than 13%; in addition, nickel (Ni) or molybdenum (Mo) can be added to increase the effect. Due to different alloy types and contents, there are many types. Characteristics of stainless steel: good corrosion resistance, good brightness, high strength; certain elasticity; expensive. Characteristics of stainless steel materials: 1. Ferritic stainless steel: It has a high Cr content and has good resistance and high temperature oxidation resistance. 2. Austenitic stainless steel: Typical grades such as /Cr18Ni9, /Cr18Ni9T1 are non-magnetic, have good corrosion resistance, good high temperature strength and high temperature oxidation resistance, good plasticity, good impact toughness, no notch effect, and excellent weldability, so they are widely used. This kind of steel generally has low strength, low yield strength, and cannot be strengthened by heat treatment, but after cold pressing and processing, it can make the tensile strength high and improve its elasticity, but the strength obtained by cold drawing at high temperature is easy to be lost. It is not suitable for bearing high loads. 3. Martensitic stainless steel: Typical grades such as 2Cr13, GX-8, are magnetic, have excellent shock absorption, good thermal conductivity, high strength and yield limit, and have good comprehensive mechanical properties after heat treatment strengthening. In addition, it has a high carbon content, and needs to be treated after welding to eliminate stress. High temperature cooling is easy to form 8-body, so it should be cooled slowly after forging, and should be tempered immediately. It is mainly used for load-bearing parts. Example: 10Cr18Ni9 is an austenitic stainless steel. Quenching cannot strengthen it, but can only eliminate cold work hardening and obtain good corrosion resistance. Quenching and cooling must be carried out in water to ensure the best corrosion resistance. It has stable oxidation resistance below 900℃. It is suitable for welding by various methods. It has a tendency to intergranular corrosion. When parts work in corrosive media, water and steam media for a long time, they may suffer from intergranular corrosion damage. After quenching, the steel has high cold deformation plasticity and good elongation, but poor machinability. 1Cr18Ni9 It is a standard 18...
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