| Popis: |
The realized deformation and steel critical deformation is determined by working conditions. If the realized deformation is equivalent to the critical one or greater than it, cracks appear on the surface. The goal of the work is to determine the realized deformation at tube manufacture from our steel according to API SCT Norm, dimensions 174, 80×8, 05 mm and 244, 48×11, 99 mm on pilger rolling stand, cause surface craks in the firm Valjaonica cijevi Sisak d.o.o. (Tube Rolling Mill Sisak) Based on the research results, it was determined that tube deformation take place under critical boundary, i.e. pilger rolling stand deformation size does not cause surface craks (the cause should be sought in charge quality and other working phases). |
