BILLET DEFECTS: PIN-HOLE AND BLOW-HOLE FORMATION, PREVENTION AND EVOLUTION

1. Billet is a semi-finished product used in the iron and steel industry. , a variety of liquid iron using the
continuous casting process 2 of 150 x 150 mm (Continuous Casting Process). The billet is then
reheated and rolled to produce final products Various items such as rebar, wires, pipes, etc.
Billet defects are blemishes or defects that appear on the surface of the billet or inside it, and have a
negative impact on the quality of the billet. The final product and the efficiency of the rolling
process.
Where the defects of billet are divided into:
• Defects in shape
• Internal defects
• Surface defects
There are several factors that cause billet defects, such as manufacturing shelves, cooling, storage,
transportation, and heating. And the rolling mill. Some of these factors are temperature, time,
pressure, chemical composition, and tension. Internal, chemical reactions and environmental
pollution. This report aims to analyze the causes and effects of defects
Billet is used in rolling iron and steel, and there are ways to protect or dispose of it.