The surface quality of ASTM A709 steel plate

The ASTM A709 steel plate is delivered in a hot-rolled or controlled-rolled state, and normalizing or tempering is allowed.

In order to improve toughness, it is allowed to use a cooling method with a faster cooling rate than that in air, but the ASTM A709 steel plate should be tempered.

Surface quality, the surface of ASTM A709 steel plate shall be free from air bubbles, scabs, cracks, folds, inclusions and indented iron oxide scale, and shall not be delaminated.

The surface is allowed to have a thin layer of iron oxide scale, rust that does not hinder the surface inspection, insignificant roughness, scratches, reticulation caused by rollers, and other local defects caused by the peeling of the iron oxide scale by pressing in. It is allowed to exist, but the thickness tolerance shall not be exceeded half and shall guarantee the minimum thickness of ASTM A709 steel plate. Surface defects of ASTM A709 steel plates are allowed to be removed by grinding, but not repaired by welding.