Development of Manufacturing Technology for High-Strength Hull Steel Reducing Production Cycle and Providing High-Quality Sheets
- 1 — Chief Engineer NRC «Kurchatov Institute» – CRISM «Prometey»
- 2 — Ph.D., Dr.Sci. Head of laboratory NRC «Kurchatov Institute» – CRISM «Prometey»
- 3 — Ph.D., Dr.Sci. Head of Department Saint-Petersburg Mining University
- 4 — Chief Engineer NRC «Kurchatov Institute» – CRISM «Prometey»
Abstract
The article presents the results of scientific research and industrial experiments aimed at the development of technology to reduce the production cycle of high-strength hull steel. The technology includes an improved reduced heat treatment of ingots made using rare-earth metals and uphill teeming of large sheet ingots. The proposed technology for the preliminary heat treatment of ingots eliminates the high-temperature phase re- crystallization operation, which is unnecessary, according to the authors, since it does not allow partial crushing (grinding) of the metal dendritic structure and homogenization. When using the proposed technology of reduced pre- treatment, phase and structural stresses are sharply reduced. Experiments have shown that the modification of steel with rare-earth metals has a positive effect on the crystallization of ingots, changing the macro- and microstructure of alloy steel. The developed manufacturing technology of high-strength hull steel provides a high level of sheet quality and a reduction in the production cycle time by 10-12 %.