Round hollow steel

Round hollow steel cooling system:

The semi-continuous rolling workshop adopts air-cooled cooling according to the existing technology and equipment conditions.The rapid cooling of hollow steel after rolling can easily cause excessive hardness and uneven internal organization. Therefore, the steel should be cooled evenly on each surface of the cold bed.This not only achieves uniform hardness, but also is not easy to bend, avoiding internal tissue damage caused by straightening and affecting the service life of the drill rod.At the same time, the cold bed area is closed to reduce air convection, reasonably control the rolling rhythm, and keep the atmosphere in the cooling area within a certain range to ensure uniformity.And according to the rolling of different steel grades, different cooling process systems can be used to achieve different hardness requirements.The rolling hardness control range is HRC30～44.