Accreditation Administration System:
In order to obtain the required shape, the steel plate must be permanently deformed. The process adopted can be local or overall bending, deep drawing, tension or a combination of these forming methods.
1.For the forming of ordinary carbon steel plate, the yield point value is too high, which may lead to excessive rebound, easy fracture during forming, fast wear of abrasive tools and defects due to poor plasticity. However, when the yield point of the material is less than 140MPa, it may not withstand the stress applied in the forming process. For the steel plate used in the more complex forming process, it is usually required to have a relatively low yield strength value, and the smaller the yield ratio, the better the formability of the steel plate.
2.The cold formability of the thick steel plate is directly related to the yield strength and elongation of the material. The lower the yield strength is, the smaller the stress required to produce permanent deformation is; the higher the elongation is, the higher the ductility can be allowed to bear large deformation without fracture.
3.For steel plates used in building structures, bridges and mechanical structures, in order to prevent component fracture, the steel plate material is required to have specific tensile strength, and in order to prevent component deformation, the steel plate material is required to have a certain yield strength. Therefore, the minimum or range value of tensile strength and yield strength is required for steels used in this kind of purposes.
4.Steel plates for ships, bridges, oil and natural gas pipelines are required to have enough impact toughness impact energy value to prevent brittle fracture in use.
