EMT pipe bender manufacturers believe that the basic principle of material selection is to ensure that the material meets the service performance first, and then consider making the material process performance as good as possible and the material economy as reasonable as possible. The use value, safety reliability and working life of parts mainly depend on the use performance of materials, so the basic starting point of material selection is whether the parts have enough use performance.
The manufacturer of EMT pipe bender thinks that the mechanical property index of the material should be selected and the strength, plasticity and toughness of the material should be used correctly. In general, the higher the strength of the material, the lower its plasticity and toughness. One sided pursuit of high strength to improve the bearing capacity of parts is not necessarily safe, because the excessive reduction of material plasticity, short-term overload and other factors, the sensitivity of stress concentration increases, which may cause brittle fracture of parts.
Therefore, while increasing the yield strength, the manufacturer of EMT pipe bender thinks that the plasticity index of the material should also be considered. Generally, plasticity and toughness indexes are not directly used in design calculation to improve the bearing capacity and brittle fracture resistance of parts. For the parts with low stress brittle fracture as the main failure form, such as large forgings such as steam turbine and motor rotor, and petrochemical vessels and pipelines working at low temperature, the traditional mechanical method should not be used to roughly estimate the plasticity index.
