Irregularity of microhardness and microstructure of low-carbon steel rolled in a two-stand rolling-leveling mill

The relevance of the study is proved by two factors. One them necessity to nature change in microstructure cross-section extra-thin tinplate made TS 435 steel (analogue 08ps steel) skin-passed a new DSR-1250 mill Miory Metal Rolling Plant. second factor need develop an effective method for obtaining accurate geometry characteristics oblique cut 0.19 mm or less thick. purpose work determine changes microhardness and over thickness samples identify existence layer necessary this type flat-rolled products. was carried out on selected This rolled from annealed strip, 0.224 total magnitude reduction 15 %, skin-pass stand at least 3 %. authors measurements different points samples. values strip were averaged using 6th degree polynomial interpolation. To grain dimension, number images taken various areas sheet with ×500 magnification. studies showed pronounced strain grains elongated direction rolling. At very boundary metal contacting rolls, received greatest deformation. highest identified zones adjacent both surfaces central layers along thickness. has wave-like character three increase hardness decrease its values. lowest are located between maximum