Method for smelting nitrogen-containing low-phosphorus SA-508-3CL1 steel at low cost

• Main Authors: YIN WEIJIANG, XU TENGFEI, LONG JIE, GAO MINJIE, ZHANG ZHIJUN, WANG TIANTIAN, SONG QINGJI, PANG HUIYONG, WANG HUILING, XIANG YOUZHEN, WEI MING
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2023
• 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 low-cost method for smelting nitrogen-containing low-phosphorus SA-508-3 CL1 steel, which comprises the procedures of electric furnace smelting, LF (ladle furnace) refining, VD (vacuum degassing) vacuum treatment, continuous casting and stacking, in the LF refining procedure, nitrogen is blown after an aluminum wire is fed in the later stage of refining; the VD vacuum treatment process comprises the following steps: keeping vacuum for 10-15 minutes, and then blowing nitrogen for 10-20 minutes, wherein the nitrogen flow is 60-80 L/min; calcium treatment is carried out after vacuum treatment, 70-100 m of calcium is fed in each furnace, and the feeding speed is 2-3 m/s; and after soft blowing is conducted for 8-12 min, 20-30 Kg of vanadium-nitrogen alloy is supplemented. According to the SA-508-3 CL1 steel produced through the method, the center segregation is smaller than or equal to 1.0 level, the center porosity is smaller than or equal to 1.0 level, the center crack is smaller than