Pentru mărirea durabilităţii sculelor aşchietoare la prelucrarea oţelurilor maleabile se propune durificarea preventivă, proces, care a fost implementat cu succes la broşarea găurilor pieselor de tip culbutor.
For the massive steel products, at the same time with the coming out of a thermal gradient on the heating section very important also appears the variation of the thermo – physical characteristics (thermal conductivity λ, ...