The surface quality of angle steel is specified in the standard, generally requiring the absence of defects harmful for use, such as分层 (laminations),结疤 (slag inclusions),裂缝 (cracks), etc.

The allowable range for geometric deviations of angle steel is also specified in the standard, generally including bend, edge width, edge thickness, apex angle, theoretical weight, etc., and it is stipulated that angle steel should not have significant twisting.