Smelting manufacturing method for high temperature ferric alloy

Abstract

A technology for smelting the refractory Fe-base alloy includes such steps as primary smelting in ordinary electric arc furnace by return oxygen blowing method and smelting the qualified refractory Fe-base alloy in AOD furnace. Said second step includes blowing the mixture of argon gas and O2 in ratio of 4:1 for decarbonizing, heating, blowing the mixture of argon gas and O2 in ratio of 1:1 when C content is 0.1%, sampling and analyzing, regulating contents of its components, blowing argon gas when C content is 0.03%, adding prereducing slags, prereducing, sampling and analyzing, adding reducing slags, blowing argon for dissolving slags, blowing argon for 3 min, adding Ti in ladle, tapping, and casting rod electrodes.

Description

technical field [0001] The invention relates to a method for smelting and casting a superalloy in the metallurgical industry, in particular to a method for smelting and casting an iron-based superalloy. Background technique [0002] Superalloys are important metal materials necessary for modern aero-engines and rocket engines. It can be used for a long time under high-temperature (generally 600-1000°C) oxidizing atmosphere and gas corrosion conditions under greater stress. Iron-based superalloys are common high-temperature alloys with a high degree of alloying, especially containing active alloying elements (such as aluminum and titanium) and high requirements for alloy purity, so the requirements for smelting processes are strict. [0003] At present, the smelting methods of iron-based superalloys mainly include "vacuum consumable induction furnace smelting + electroslag remelting" or "electric arc furnace smelting + LF refining furnace + electroslag remelting". The use o...

AI Technical Summary

Problems solved by technology

[0005] In addition, compared with the smelting method of "vacuum self-consumption induction furnace" to produce iron-based superalloys, "salt water lining electric arc furnace smelting method" has the advantages of low smelting cost and no carbon in the furnace lining, but due to the characteristics of the electric arc furnace itself, During smelting, the stirring performance of molten steel is poor, the effect of removing harmful gases and impurities in molten steel is poor, and the desulfurization effect is also poor; secondly, due to the high content of chromium (Cr) in iron-based superalloys, It is easy to cause chromium segregation; in addition, when the electric arc furnace smelts iron-based superalloys, the decarburization (C) and degassing effects are poor, so the requirements for the C content and N content of the raw materials are very high, resulting in an increase in raw material costs (low C chromium alloy cost substantially higher than high C chrome alloys)