Results are provided for a study of the effect of different microalloying systems (Nb, Nb–V, V–N) on structure formation and mechanical properties of rolled product of strength class K52 produced by combined technology of melting, casting of thin slabs 90 mm thick, and direct rolling with subsequent accelerated cooling and winding on a coil. It is shown that all of the micro-alloying versions selected provide the required strength properties, while metal microalloyed solely with niobium demonstrates the best brittle fracture resistance at low temperature. It is shown that addition of niobium to steel not only refines grain size in the metal matrix, but also changes ferrite morphology increasing the proportion of acicular ferrite, which improves steel cold resistance.

中文翻译：

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CRU条件下微合金化对强度等级K52轧制产品组织和力学性能形成的影响研究

研究了不同微合金化体系（Nb、Nb-V、V-N）对采用熔炼、连铸 90 mm 薄板坯联合技术生产的强度等级 K52 轧制产品的组织形成和力学性能的影响厚，直接轧制，随后加速冷却并卷绕在卷上。结果表明，所有选择的微合金化版本都提供了所需的强度特性，而仅用铌微合金化的金属在低温下表现出最佳的抗脆性断裂性能。结果表明，在钢中加入铌不仅可以细化金属基体中的晶粒尺寸，而且可以改变铁素体形态，增加针状铁素体的比例，从而提高钢的耐寒性。