SMELTING PROCESS FOR HIGH-NIOBIUM HIGH-TEMPERATURE ALLOY LARGE-SIZE CAST INGOT, AND HIGH-NIOBIUM HIGH-TEMPERATURE ALLOY LARGE-SIZE CAST INGOT

• Main Authors: LI, Lianpeng, QI, Chao, DUAN, Ran, ZHAO, Guangpu, ZHANG, Beijiang, QIN, Heyong, CHOU, Yingyu, HUANG, Shuo
• Format: Patent
• Language: Chinese; English; French
• Published: 04.03.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Disclosed are a smelting process for a high-niobium high-temperature alloy large-size cast ingot, and a high-niobium high-temperature alloy large-size cast ingot. The smelting process comprises: carrying out vacuum induction smelting to prepare a plurality of vacuum induction ingots with the same components, further preparing the same number of electroslag electrodes, carrying out exchange electroslag remelting, then preparing consumable electrodes by using obtained electroslag ingots, and then carrying out vacuum consumable remelting multiple times by taking the consumable electrodes as initial raw materials. By means of the process, a high-niobium high-temperature alloy large-size cast ingot with an ingot weight of 15 tons or above and a diameter of 800 mm or more can be prepared, black spot and white spot metallurgical defect formation is inhibited to the maximum extent, the element segregation degree is reduced, and steel ingot bursting is effectively prevented. L'invention concerne un procédé de fusion p