Large-size high-niobium high-temperature 706 alloy ingot and smelting process thereof

• Main Authors: ZHANG BEIJIANG, DUAN RAN, LI LIANPENG, ZHAO GUANGPU, CHOU YINGYU, QI CHAO, HUANG SHUO, QIN HEYONG
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2020
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a large-size high-niobium high-temperature 706 alloy ingot and a smelting process thereof. The problems that the serious melting loss of Al and Ti elements is prone to occurring to an existing smelting process and metallurgical defects of black spots and white spots are prone to occurring to the prepared high-niobium high-temperature 706 alloy ingot are solved. The smeltingprocess comprises the steps that vacuum induction melting is carried out, a plurality of vacuum induction ingots with the same component are prepared, then electroslag electrodes with the same numberare prepared, (CaF2-CaO-Al2O3-TiO2) quaternary slag is used for exchanging electroslag remelting, then prepared electroslag ingots are used for preparing consumable electrodes, and then the consumable electrodes are used as initial raw materials to perform twice vacuum consumable remelting. By adopting the smelting process, the high-niobium high-temperature 706 alloy large-size ingot with the ingot weight of more than 15