METHOD FOR PREPARING HOT ROLLED STEEL STRIPS TO ETCHING Russian patent published in 2002 - IPC

FIELD: plastic metal working, possibly manufacture of cold rolled steel, namely preparation of rolled pieces to etching. SUBSTANCE: method for preparing hot rolled steel to etching comprises steps of preliminarily reducing of preset length of moving strip in skin pass rolling stand with rolls having predetermined surface roughness and rigidity; varying reduction value ≤ in dependence upon planned tonnage T of strip subjected to skin pass rolling during operational campaign of rolls. At tonnage 0.3T when reduction value 2% ≤ 2.5%; at tonnage more than 0.3T and less or equal to 0.6T when 2.5% ≤ 3%; at tonnage more than 0.6T when 3% R₂ 4%, using rolls with barrel Shore hardness 94-96 and surface roughness parameters of rolls R=(15-35)micrometers and S more than 35 micrometers along basic length l=0.8mm. EFFECT: enhanced quality of cold rolled strip steel due to lowered number of flaws because of etching rolled piece. 1 ex