As we all know, metal signs are used more and more in various fields of modern society, mainly in the fields of electronic products, home appliances, machinery and civil products. Such popularity is mainly due to the performance requirements of metal signs for materials, which need to be strictly reflected in strength, hardness, plasticity, fatigue strength, impact toughness, etc.

　　1. Strength: The ability of metal sign materials to resist plastic deformation or fracture under load.

　　1. Symbol representation: yield strength σs - the minimum stress when the material yields. The unit is Mpa.

　　2. Tensile strength σb——the maximum stress that the material bears before breaking. The unit is Mpa.

　　3. Application conditions and scope: the main basis for designing mechanical parts and selecting materials.

　　2. Hardness: the ability of the metal sign material surface to resist deformation when another object is pressed in.

　　1. Symbol representation: Brinell hardness HB; Rockwell hardness HR.

　　2. Application conditions and scope: Brinell hardness is mainly used to measure gray cast iron, non-ferrous metal signs and annealed, normalized and quenched and tempered steel materials. HBS is suitable for measuring materials with a hardness value of less than 450, and HBW is suitable for measuring materials with a hardness value of less than 650. The Rockwell hardness tester can measure soft metal materials as well as hard metal materials. HRA is mainly used to measure cemented carbide and surface hardened steel; HRB is mainly used to measure mild steel, annealed steel, copper alloy, etc.; HRC is mainly used to measure general hardened steel.

　　3. Plasticity: The ability of metal sign materials to produce plastic deformation without breaking under load.

　　1. Symbol representation: elongation after fracture δ——the relative elongation of the gauge length after the sample is broken.

　　2. Section shrinkage rate ψ - the relative shrinkage rate of the cross-sectional area of ​​the sample after the sample is broken.

　　3. Application conditions and scope: the main basis for material selection during pressure processing.

　　Fourth, fatigue strength: the maximum stress of the metal sign material without breaking under repeated repeated alternating loads.

　　1. Symbol representation: fatigue strength δ-1

　　2. Application conditions and scope: ferrous metal cycle times 10 to the 7th power, non-ferrous metal signs and some high-strength steel cycle times 10 to the 8th power.

　　5. Impact toughness: the ability of the metal sign material to resist the impact load without damage.

　　1. Symbol representation: impact absorption energy Ak; impact toughness ak.

　　2. Application conditions and scope: The impact toughness value is generally only used as a reference when selecting materials, and cannot be used as a basis for calculation. The multiple impact resistance of the material mainly depends on the plasticity; when the impact energy is low, it mainly depends on the strength.

　　In summary, the production of metal signs is mainly based on copper, iron, aluminum, zinc alloy, titanium, stainless steel and other raw materials, through stamping, die-casting, etching, printing, enamel, imitation enamel, baking paint, dripping, electroplating and other processes. made. The performance requirements of its metal signs for materials are the specific contents described above.