Super-pure smelting method for industrially producing Incone1690 alloy

Abstract

The invention belongs to the technical field of vacuum induction smelting, and relates to an improvement on a smelting process for industrially producing Incone1690 alloy, in particular to a super-pure smelting process for industrially producing Incone1690 alloy. The process uses a CaO fireproof material with high purity (CaO is more than 98.5 percent) and good thermodynamic stability as a crucible material for the vacuum induction smelting. The specific smelting process comprises charging, smelting period, refining period, condensing, deoxidizing and desulfurizing period and casting, whereinin the refining period, effective deoxidization and desulfurization are carried out on the wall part of a crucible and the surface of molten steel by improving the refining temperature and strengthening the thermodynamic and kinetic conditions of deoxidization and desulfurization; and in the deoxidizing and desulfurizing period, final deoxidization and desulfurization are carried out for the alloyby adding strong deoxidizing and desulfurizing agent so as to further reduce the contents of oxygen and sulfur in the alloy below 10 ppm.wt. The process effectively improves the high-temperature plasticity of the alloy, improves the thermal processing performance of the alloy, and obtains the high-quality alloy.

Description

technical field [0001] The invention relates to the field of vacuum induction smelting, in particular to an ultra-pure smelting process for industrial production of I-690 alloy. Background technique [0002] Inconel690 alloy is an American brand, and its main components range as follows: [0003] [0004] Usually, MgO or MgO-Al is used in industrial vacuum induction melting to produce Inconel690 alloy. 2 o 3 The crucible made of refractory material cannot achieve high-temperature deoxidation and desulfurization during the refining period, and no strong deoxidizing and desulfurizing agents are added at the end of the smelting period. Generally, the oxygen and sulfur content of the alloy produced is about 20ppm.wt (weight), which cannot be ultra-pure. Therefore, the high-temperature plasticity of the alloy is low, and the alloy cannot be ideally hot-worked, resulting in a low yield of hot-worked alloys. Contents of the invention [0005] The purpose of the present inv...

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Problems solved by technology

[0004] Usually, MgO or MgO-Al is used in industrial vacuum induction melting to produce Inconel690 alloy. 2 o 3 The crucible made of refractory material cannot achieve high-temperature deoxidation and desulfurization during the refining period, and no strong deoxidation and desulfurization agents are added at the end of the smelting period.

Generally, the oxygen and sulfur content of the alloy produced is about 20ppm.wt (weight), which cannot reach ultra-pure

Therefore, the high temperature plasticity of the alloy is low, and the ideal hot working of the alloy cannot be carried out, so that the hot working yield of the alloy is low

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