Downgraded or secondary quality HSS tubes are usually sold in bundle. They are downgraded due to some imperfection on a section of a tube or on parts of a lot. The most common defects are the following:
 Visible outer welding |  Different lengths within a same lot |
 Weld Joint (buttweld) |  Faulty welding (split) |
Other types of defects can also cause a downgrade. In general, lots that are sold contain a material loss of less than 10% of the total weight of a bundle. The purchase of secondary quality tubes is ideal for contract work that require cutting along the length.
