Does Temper Passing, Coil to Coil, yield the same results?
No, while Coil-to-Coil processing is extremely effective for removing shape defects, reintroducing the coil into a tightly wound coil reintroduces coil set that could be difficult to remove in higher strength steel applications. DBI’s process of unwinding the strip, making it perfectly flat, and shearing it to length ensures a sheet perfect free of all memory. Rewinding the coil after temper passing induces new stresses in the steel that will not be removed later by simply leveling. Is “Stretch Leveling” as effective as Temper Passing? No, Stretch Leveling is a process that clamps the steel at two points and subjects the material between the two clamps to tension in an effort to stretch the shorter fiber equal to the longer fibers. The material under the clamps is not affected. Manufacturers of Stretch Levelers will tell you that they advance the strip and stretch it again, but that would mean that some material is stretched once and some is stretched twice. Furthermore, a perfectly un
