Levelers fall into three categories:
Leveling is the process of flattening steel strip or sheet through several work rolls with a smaller diameter "backed up" with rolls behind the work rolls to minimize deflection.
Precision or Corrective Leveling
Indicates that the backups are fully adjustable to create a bend in the rolls. A corrective leveler reduces shape defects across the strip and removes the coil set. Precision Levelers contain 17 to 23 driven work rolls and have adjustable backups. These Levelers will have 4HI, 5HI or 6HI configuration. Painted product or stainless steel requires 5HI or 6HI configuration depending on surface critical demand.
Is a step-up in corrective leveling. The material is run through the entry and exit set of bridle rolls with the corrective leveler placed in-between the Bridle sets. The material is put under a significant amount of tension with a slight elongation above the yield point of the material while simultaneously being leveled. The material, therefore, is shape corrected and released of most internal stresses. A tension leveler will require a dedicated line of equipment with Uncoiler & Recoiler or Uncoiler to Sheet Stacker. The Bridles demand a larger footprint and, therefore, more floor space in the end-users plant.
Is supreme when it comes to leveling. The stretch level process is a method in which the material is stretched beyond its yield point to equalize the stresses providing a product with superior flatness. This process can eliminate shape defects such as edgewave, center buckle, quarter buckle, camber, crossbow, coil breaks, etc. The result is a material ideal for meeting fabricators' increased demands for flatness. Stretch leveling can also restore to perfection a steel coil that would be labeled secondary or scrap.
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