Low-cost 420MPa-grade H-shaped steel and preparation method thereof

• Main Authors: PAN TAO, CHAI XIYANG, LIAN XIAOJIN, LUO XIAOBING, YANG CAIFU, CHAI FENG, CHEN XUEHUI, LI LI, LI JIAN, SHI ZHONGRAN
• Format: Patent
• Language: Chinese; English
• Published: 26.03.2024
• 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 relates to low-cost 420MPa-grade H-shaped steel and a preparation method thereof, belongs to the technical field of H-shaped steel microalloying, and aims to solve the problem of high production cost of existing high-strength H-shaped steel. The invention relates to low-cost 420MPa-grade H-shaped steel, which comprises the following chemical components in percentage by weight: 0.10 to 0.20 percent of C, 0.20 to 0.40 percent of Si, 1.20 to 1.60 percent of Mn, 0.03 to 0.10 percent of V, 0.005 to 0.05 percent of N, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S and more than 4 percent of V/N. And the balance of Fe and inevitable impurities. The yield strength of the prepared H-shaped steel is larger than or equal to 420 Mpa, the tensile strength is larger than or equal to 550 MPa, the ductility is larger than or equal to 25%, and the impact energy is larger than or equal to 150 J; the material has good mechanical property stability and plasticity and toughness, and