Heating-class steel strip and sheet (GB 2519-81)
Hot rolled steel strip and sheet is an important class of steel products which developed rapidly in China in the early 1980s. Hot rolled steel strip and sheet products can be divided into two categories according to their production methods: one is hot rolled strip, and the other is hot rolled sheet. The hot rolled strip is mainly produced by continuous rolling mill. The hot rolled sheet is mainly produced by roll-forming machine. Hot strip and hot-rolled sheet have specific features and can be used for different purposes in industrial production. It has wider application in the fields of automobile manufacturing, steel construction and other industries.
GB 2519-81 is the national standard for hot rolled steel strip and sheet in China. The standard stipulates the requirements, test methods, inspection rules and marking, packaging, transportation and storage of hot rolled steel strip and sheet. These standards provide a scientific basis for the quality control and use of hot rolled steel products.
GB 2519-81 is divided into six parts, which are product name and classification, orders requirements, chemical composition, mechanical properties, dimension, shape and tolerance, test methods, inspection rules and three annexes. According to the technical requirements of the product and the production process of hot rolled steel strip, 30 kinds of hot-rolled steel strip and 17 kinds of hot-rolled steel sheet are specified. The standard also stipulates the corresponding indicators such as chemical components, tensile properties, bending properties, low temperature impact properties and so on.
In the production and use process of hot rolled steel strip and sheet, the quality management and control of it should comply with the requirements of GB 2519-81. The products should be inspected regularly. After inspection, the products can be put into operation and use. The inspection results should be timely reported to the manufacturer and the user.
Since the completion of GB 2519-81, the quality of hot rolled steel strip and sheet has improved greatly.It has been widely used in automotive manufacturing, steel construction and other industries, which greatly improves the efficiency of production and enterprises, reduces costs and promotes the further healthy and rapid development of Chinas hot rolled steel strip and sheet products.
