What problems should be paid attention to when choosing the material of medium and heavy plate blank?

(1) The content of harmful elements phosphorus and sulfur shall be as low as possible;

(2) The range of upper and lower limits of element content should be as small as possible, especially the content of carbon element;

(3) The content of non-metallic inclusions should be minimized.

Surface longitudinal cracks, surface transverse cracks, star cracks, subcutaneous pores and inclusions, bulges, internal cracks, central segregation and central porosity, non-metallic inclusions.

Flame cleaning, air shovel cleaning, grinding wheel grinding, machine tool processing, arc cleaning, etc. When selecting, attention should be paid to the steel type of raw materials, the specific conditions of heating and rolling, and the requirements for the surface quality of finished steel plates.