Quality requirement 1: The surface of the steel used in quality pitch roof solar mounting must not have rust, pitting, scratches and indentations, etc., and its depth cannot be greater than the thickness of the dry steel, and its negative allowable deviation value needs to be within two minutes one or so.

Quality requirement 2: The end edge or fracture of the steel used on the quality pitch roof solar mounting must not have defects such as delamination and slag inclusion, otherwise, once it is used in the manufacture of equipment, it will affect the service life of the equipment.

Quality requirement 3: The corrosion level of the steel surface used on the quality pitch roof solar mounting must meet the national standard, and must meet the specified grade C or above. When using C grade in equipment manufacturing, it should be thoroughly derusted .