Before leaving the factory, H - beam undergoes a series of inspections. Dimensional inspection is carried out to ensure that the height, width, web thickness, and flange thickness meet the specified standards. Visual inspection checks for surface defects, such as cracks, scratches, and uneven surfaces. Mechanical property testing includes tensile tests to determine the tensile strength and yield strength, and bending tests to assess the ductility of the H - beam. Chemical composition analysis is also performed to verify that the content of various elements is within the allowable range. Additionally, straightness inspection is conducted to ensure that the H - beam is not bent or warped.