Differences between Hot Rolled and Cold Rolled Seamless Steel

The term "hot-rolled steel tube" refers to a steel tube that has been rolled in a furnace at a high temperature, usually in the range of 1,200 to 1,500 degrees Celsius. The cold-rolled or cold-forming process involves passing the sheet metal through a die that cools in water for about one week.

What are the differences between hot-rolled and cold-rolled seamless steel tubes?

Uses of different kinds

Seamless steel pipes used in industrialized or industrial applications are medium- and high-pressure steel pipes, as well as alloy steel pipes. The main hot working and cold working difference is their design; some are simpler while others are more complex.

Size differences

Hot-rolled seamless pipes usually have an outer diameter of greater than 32mm and a wall thickness of 2.5-75mm.  A cold-rolled seamless pipe can have a diameter of 6mm and a wall thickness of 0.25mm.

Differences in processes

Cold-rolled formed steel allows local buckling whereas hot-rolled steel does not Since hot-rolled steel and cold-rolled steel have different sources of residual stress, their distributions are also very different. Since hot-rolled steel has a higher free torsional stiffness than cold-rolled steel, its torsion resistance is better.

As a result, there will be a negative difference between hot rolling and cold rolling the actual dimensions and those calculated by the engineer.  We have to stabilize the thickness of each product with a certain degree of tolerance