Abstract
This article describes the working process of OMK Heavy Plate Mill 5000. Based on the fabricator's facilities capability, the technological production flow diagram of thick steel sheets of K60 (X 70) grades, for cold-working large diameter pipes has been developed. As the initial blank authors used a 310×2.100×3.170 mm plate slab. The controlled rolling process, described in the article, consists of two stages –roughing-down (when deformation and re-crystallization results in obtaining fine uniform austenite grains) and finishing rolling (when austenite is hammer-hardened and converted into fine-grain ferrite). As a result of the research has been selected and the optimal temperature conditions for rolling in the passes, which would reduce the waste of metal in furnace.
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