Hot rolling is carried out above recrystallization temperature. It can destroy the casting structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; Bubbles, cracks and looseness formed during pouring can also be welded under high temperature and pressure.
The production process of hot rolled seamless steel pipe includes several basic processes, such as preparation of billet before rolling, billet heating, piercing, rolling, sizing and reducing, cooling and finishing of steel pipe. Nowadays, there are three main deformation processes in the production of hot rolled seamless steel tubes: piercing, rolling and sizing
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