Manufacturing method for improving delayed cracking resistance of heavy rail steel

• Main Authors: SONG JIANHONG, CHEN YONG, HE JIA, LANG FENGJUN, CHENG PENG, LI JIANGWEN, PANG TAO, MA YING, ZHU MIN
• Format: Patent
• Language: Chinese; English
• Published: 05.09.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a manufacturing method for improving delayed cracking resistance of heavy rail steel, and the technical scheme is as follows: the steel comprises the following components in percentage by weight: 0.68-0.78% of C, 0.43-0.63% of Si, 1.2-2.2% of Mn, less than or equal to 0.010% of P, less than or equal to 0.004% of S, 0.020-0.050% of (Nb + V + Ti), less than or equal to 0.003% of Als, 2.2-3.2% of Cr, 0.0010-0.0020% of Re, less than or equal to 0.00005% of H and the balance of Fe and impurity elements, and the manufacturing method is completed through molten iron deep desulfurization, LF refining, molten steel continuous casting and rolling. The method is simple in process, easy to control, low in production cost and excellent in performance, and the delayed cracking resistance of the heavy rail steel can be effectively improved. 本发明公开了一种提高重轨钢抗延迟开裂性能的制造方法，技术方案为：钢成份按重量百分比包括C:0.68％～0.78％、Si:0.43％～0.63％、Mn:1.2％～2.2％、P≤0.010％、S≤0.004％、(Nb+V+Ti)：0.020～0.050％、Als≤0.003％、Cr:2.2％～3.2％、Re：0.0010～0.