MANUFACTURING METHOD OF ROLLED LOW-ALLOY PLATE Russian patent published in 2013 - IPC C21D8/02 B21B1/26 C22C38/20 C22C38/48 

FIELD: metallurgy.

SUBSTANCE: method involves heating of continuously cast billets, roughing till intermediate thickness, cooling of intermediate billet, finish rolling of the semifinished rolled product to the specified thickness of 10-40 mm; accelerated cooling of the obtained rolled plate; at that, finish rolling is performed at restricted interval of the rolling end temperature: Ar₃+K_E+20≤T_{roll end}≤Ar₃+K_E+70, where T_{roll end} - rolling end temperature, °C; Ar₃ -physical temperature of polymorphous ferritic steel conversion, which is determined based on content in low-alloy steel of 14 chemical elements, °C; K_e - additive correction for deformation, which is set depending on relative crimping in the last finishing pass, °C.

EFFECT: achieving the required set of mechanical properties of the strip and avoiding the necessity of carrying out heat treatment of finished plates.

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