Accreditation Administration System:
1. Mechanical property: the mechanical property of steel plate refers to the stress that the steel plate reacts with elasticity or inelasticity under the action of force. Tensile strength, yield point, elongation and impact absorption energy are the main indexes to express the mechanical properties of hot rolled steel plate. The ability of steel to resist various actions is the main criterion to evaluate the quality of steel plate material, and also the main basis for material selection and strength calculation in steel plate design.
2. Mechanical properties test: the main tests to determine the mechanical properties of hot-rolled steel plate are tensile test and impact test.
3. Yield strength: the stress when the load does not increase or begins to decrease while the specimen can continue to stretch (deform). The lower the yield strength of steel, the smaller the force required to produce permanent deformation, that is to say, the easier the forming process.
4.Tensile strength: the maximum stress that the specimen bears before breaking when it is stretched. When the external stress of the material is greater than its tensile strength, it will break. Therefore, the greater the tensile strength of the steel plate material, the more it can bear the external stress without breaking.
5.Elongation: elongation refers to the ratio of the elongation length to the original length of the specimen after tensile fracture. The larger the ratio of elongation is, the better the material can withstand permanent deformation before stress failure; otherwise, the worse the plasticity is.
6.Impact energy (impact absorption energy): during the impact test, the energy absorbed when the specimen of specified shape and size breaks under the impact force once, and the magnitude of impact energy indicates the resistance of metal materials to the impact load. The higher the impact energy is, the stronger the material's ability to resist sudden brittle fracture is.
