The skin-pass is the last stage in rolling in order to improve the following:

  • hardness
  • yield limit
  • elongation to avoid Luder bands
  • magnetic properties (low core loss and high permeability)
  • surface finish
  • flatness
  • shape defects
  • to breakup the spangles in galvanized steel
  • to apply rust preventive oil on temper rolled sheet

In wet tempering (skin passing) only the surface is work hardened. It locks dislocations at the surface and thereby reduces the possibility of formation of Luders bands. To avoid stretcher strain formation it is necessary to create substantial density of unpinned dislocations in ferrite matrix.

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