How to choose the material of hardware shrapnel

1. Heat resistance 　　The temperature of the hardware shrapnel is higher when it is used, and materials with poor heat resistance will reduce the characteristics of the shrapnel.　　2, hardenability 　　 to improve the quenching effect requires good hardenability, at least the center part should be quenched to 50%. 3. Corrosion resistance is sometimes used in corrosive environments. If the shrapnel is uniformly corroded from the surface of the shrapnel, it will only reduce the load corresponding to the reduction of some size. When the fatigue strength is higher than the estimated value, the corrosion resistance of the material is mainly determined Due to its chemical composition, there are many corrosion factors, so it is necessary to control the environment and select the material. Even if the material is appropriate, the corrosion resistance varies due to heat treatment and cold processing. 4. Fatigue strength The fatigue strength has a certain relationship with the tensile strength of the material. Fatigue strength: The fatigue strength of the shrapnel under dynamic load must be considered. However, due to the appearance of decarburization, cold processing and heat treatment, these conditions are changed due to the material of the shrapnel. The manufacturing method and the manufacturing method of the metal shrapnel change, so you must pay attention to the material selection.　　5. Elastic limit 　　 The elastic limit is the stress against the maximum force that does not remain deformed after a certain force is applied to the material. This is difficult to measure, but the elastic limit has a certain relationship with the tensile strength.