METHOD OF MANUFACTURE OF LOW-ALLOYABLE ROLL STRIPS WITH ENHANCED CORROSION RESISTANCE Russian patent published in 2018 - IPC C21D8/02 C22C38/00 B21B1/26 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy. Carry out austenization of the workpiece at 1,200–1,280 °C, rough rolling to the thickness of the intermediate tread, finishing rolling with a regulated end rolling temperature and laminar cooling with water to a coiling temperature in a roll, while the workpiece is obtained from steel containing wt.%: carbon 0.04–0.07, manganese 0.4–0.9, silicon 0.1–0.4, chromium 0.2–0.7, copper 0.3–0.6, nickel 0.15–0.60, aluminum is not more than 0.03, molybdenum is not more than 0.08, sulfur is not more than 0.003, phosphorus is not more than 0.015, when the ratio is Nb+V+Ti≤0.15, the rest is iron and inevitable impurities, austenization is carried out with a shutter speed of at least 3 hours, rough rolling of the billet is carried out with a single relative compression in the first pass of at least 30 % and at least 20 % in the last pass to ensure a rolled core thickness equal to 5.5–7.5 of the finished strip thickness, and finish rolling is carried out with a unit relative reduction in the first pass of not less than 30 % and not more than 10 % in the last pass, moreover, the temperature of the end of the finish rolling set of the ratio T_KR=800*K, °C, where K is the empirical coefficient, which is K=1.02–1.15, and the coiling of the strip into a roll is produced in the temperature range 585–670 °C.

EFFECT: obtaining rolled strip steel with a low corrosion rate while maintaining the level of strength and plastic characteristics corresponding to the strength category K52.

1 cl