GB 11253—89 Carbon Structural Steels and Low Alloy Structural Steels
GB 11253—89, issued by the National Quality Surveillance Bureau of the Peoples Republic of China, is a national standard specifying requirements for carbon structural steels and low alloy structural steels.
GB 11253—89 specifies requirements for shapes, surface quality, dimensions, strength, chemical composition and mechanical properties of carbon structural steels and low alloy structural steels. The types of steels specified by GB 11253—89 include: plates, wide flat bars, channels and angles, rolled round steel bars and squares, and shaped steel bars. GB 11253—89 also provides the requirements for heat treatment and inspection and testing methods for steels.
GB 11253—89 provides guidance for steel producers on the choice of steel grades for each application as well as guidance for steel users on proper use and selection of steel grades. GB 11253—89 also outlines the requirements for the production of state-of-the-art steels and the conditions for their delivery.
GB 11253—89 establishes the requirements for carbon structural steels and low alloy structural steels for various manufacturing processes. Such processes may include thickening, surfacing, machining, assembling, or welding. Equally important, GB 11253—89 sets forth provisions governing the design, performance, strength, and surface quality of carbon structural steels and low alloy structural steels.
GB 11253—89 also specifies the requirements for quenching and tempering, normalizing, and annealing of carbon structural steels and low alloy structural steels as well as the specific testing methods that should be used to determine the mechanical properties of the steels specified by GB 11253—89.
As a guide for practical application of the steels specified in GB 11253—89, the standard provides guidelines on selection of appropriate steel grades, the preparation of steel plates prior to the welding process, and theoretical analyses of structural steel sections.
In summary, GB 11253—89 is an important national standard from the Peoples Republic of China, which provides guidance on the requirements for carbon structural steels and low alloy structural steels for various manufacturing processes as well as provisions for their design and surface quality. It also provides guidelines for producers and users of steels on their selection and proper use of appropriate steel grades.
