REDRESSING OF MANDRELS FOR PIPE MILLS

In the production process of a special seamless tube an important tool is the mandrel mill, which pushes the hot blank into the rolling cages. This heavy process repeated hundreds of times compromises the chrome layer and often part of surface. Therefore, it is necessary regenerate the mandrels surface, which consist in the downgrading to a lower size bringing the mandrel back to a similar new condition so to a new life.