high quality of hot-rolled steel pipe

Description

Hot-rolled as for cold-rolled, cold rolling below the recrystallization temperature, rolling and hot rolling is carried out above the recrystallization temperature.

Can destroy the organization of ingot casting, refining the grain of the steel, and eliminate thedefects of the microstructure, so that the steel organization compacting, mechanical propertiesimproved. This improvement mainly reflected in the rolling direction, so that the steel to a certain extent, is no longer isotropic; pouring the formation of bubbles, cracks and loose, but also in thehigh temperature and pressure welding.