Rolling steel pipes https://odesa24.com.ua/stalnye-goryachekatanye-truby-sortament-kachestvo-y-sfery-prymenenyya/, which are made at high temperatures, is called hot-rolled. During this process, the pipes become soft and ductile. The steel is heated to a temperature of 1000C. On special vertical machines, these pipes are given a cylindrical shape. This is what makes them strong and durable.