China's GB/T 11263 is the key national standard for hot-rolled H-beams. It covers dimensions, allowable deviations, chemical composition, mechanical properties, and technical delivery conditions. The standard includes grades like Q235 and Q355, where Q235 has a minimum yield strength of 235 MPa and Q355 of 355 MPa, catering to different load-bearing needs. GB/T 11263 specifies the shape and size range of H-beams, with flange widths and web heights varying to provide options for various structural applications, from small buildings to large-scale infrastructure. It also details testing requirements, such as tensile tests, impact tests, and bending tests, to verify mechanical properties. Manufacturers must ensure their H-beams meet these requirements, and products are marked with information like the standard number, grade, and manufacturer's identifier for traceability. Compliance with GB/T 11263 is mandatory for H-beams used in Chinese construction projects, ensuring they contribute to the safety and durability of structures.