Abstract
At the Azovstal Metallurgical Combine together with the Bardin Central Research Institute of Ferrous Metallurgy a sheet steel up to 25 mm thick alloy system, steel melting technology, and a controlled rolling regime are developed, providing preparation of mechanical properties meeting the specifications laid down for steel Kh80 pipe production. The possibility is demonstrated of producing with existing equipment thick rolled sheet for gas pipelines of considerable diameter of strength category Kh80 with high impact strength (KV at –20 °C ≥ 200 J, KCV at –20 °C ≥ 250 J/cm2) and brittle failure resistance (proportion of ductile component in DWTT specimen fracture at –20 °C ≥ 95 %).
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