Smelting method for reducing edge crack occurrence rate of low-alloy steel plate

• Main Authors: OUYANG YU, TIAN HAITAO, ZHANG ZHENSHEN, JIA XUGANG, YAN HAN, HUANG ZHONG, WANG XINZHI, XU DANGWEI, CHEN CONGHU, ZHANG QUANGANG, ZHANG DAJIANG, ZHAO XIANGMEI, WANG CUINA, HUO GUILAN
• Format: Patent
• Language: Chinese; English
• Published: 22.09.2023
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a smelting method for reducing the occurrence rate of edge cracks of a low-alloy steel plate, which comprises the following steps: step 1, an electric furnace smelting process is adopted, the total loading amount of molten iron and scrap steel is 110-120 t, and in order to reduce the initial nitrogen content of molten steel, give consideration to the heat balance of an electric furnace and increase the ratio of molten iron, the molten iron and the scrap steel are added according to the proportion of 0.9-1.2: 1; 2, steel ladle bottom argon blowing is kept for more than 3 minutes in the electric furnace tapping process; deoxidation and alloying are carried out in the tapping process, and when about 1/3 of steel is tapped, 1.8-2.2 kg/t of steel core aluminum is added into a steel ladle for deoxidation; when the tapping amount reaches about 1/2, 2-3 kg/t of high-carbon manganese alloy and 10-12 kg/t of silicon-manganese alloy are added; 4, different bottom blowing argon flows are matched in